From kai.osterberg at ymed.lu.se  Mon Jan  7 16:11:46 2002
From: kai.osterberg at ymed.lu.se (Kai)
Date: Mon, 7 Jan 2002 17:11:46 +0100
Subject: Using visual-analogue scales in E-prime
Message-ID: <MON.7.JAN.2002.171146.0100.KAI.OSTERBERG@YMED.LU.SE>

Dear e-prime users,

Using e-prime, we are trying to program a 20-item questionnaire with
visual-analogue scales (VAS) for the responses. This will require the
movement of an arrow along a line (from 0 to100 percent) in response to
the question; e. g., the stimulus “Do you feel tired ?” would be
presented at the top of the screen, and below would be presented a 0-100
percent response line (with labeled endpoints) and a moveable arrow. The
subject would move the arrow back and forth along the line (preferably
by using the SRBox keys no 1 and 5) in order to fine-tune its position
until it is perceived as represntative for his/her current state. The
subject would then confirm/enter this response by pressing a separate
key, and the next question would appear (and so on).

Problem: We are able to achieve the movement of an arrow along a line,
but only by setting up each small step of arrow movement (i. e. each
key-press) as a separate reaction time (RT) stimulus-response (S-R). But
this leads to serious problems: If the scale resolution is set to 2
percent (0-100% = 50 steps), already moving along the scale once leads
to 50 RT S-R:s. Together with some margin for additional movements, the
number of RT:s must reasonably be set to at least 300 for each question!
This would of course make a 20-item questionnaire extremely large (not
to mention the enormous amount of unwanted data obtained). Obviously
this approach is incorrect. We have not succeeded to solve the riddle of
how make the arrow move back and forth along the VAS-scale in response
to keyboard inputs without making e-prime believe that each arrow
movement represents a RT S-R event. The only two response data of
interest to us is the position of the arrow when the subject makes his
FINAL confirmatory key-press and the decision time.

We would welcome any suggestion of how to properly program this type of
VAS-question within e-prime.

Thanks,

Kai Österberg, PhD
Dept. Occupational and Environmental Medicine
Lund University
SE-22185 Sweden

kai.osterberg at ymed.lu.se
phone +46-46-177292


From anthony.zuccolotto at pstnet.com  Mon Jan  7 16:37:02 2002
From: anthony.zuccolotto at pstnet.com (Tony Zuccolotto)
Date: Mon, 7 Jan 2002 11:37:02 -0500
Subject: Using visual-analogue scales in E-prime
Message-ID: <MON.7.JAN.2002.113702.0500.ANTHONY.ZUCCOLOTTO@PSTNET.COM>

Dear Kai,

You should be able to achieve this by just using a Label object in the
procedure and a Goto statement in Inline script.

Put the Label above the object that collects your input and then after
the object check in script (using an IF statement) if the subject has
made the 'final' response.  If the 'final' response was not made then
just process the key as normal and then call Goto Label1 (replace Label1
with whatever you called your label).

The TrialProc would have the following object on it
	<Label1>	' designates where to jump back to
	<Stimulus>	' collects the response
	<Inline>	' tests for final response, updates interface
and jumps

Assuming you were using the '3' key on the SRBOX as an indication of the
'final' response the inline script you would need would look sometime
like
	If Stimulus.RESP <> "3" Then
		' move arrow and draw at new location
		....

		Goto Label1
	End If

Because you jump back to the top of the procedure logging to the data
file never occurs.   Thus after the final response comes in you just let
the Procedure end normally and only that 1 trial should be logged that
contains the final response you are interested in.

If you want the 'total' response time then you should save the
Stimulus.OnsetTime of the very first trial in a global variable and then
you can compute a total RT as follows.

	Dim totalRT as Long
	totalRT = Stimulus.RTTime - g_nOnsetTimeOfFirstStimulus
	c.SetAttrib "TotalRT", totalRT

Hope that helps,
Tony

Anthony P. Zuccolotto
Vice President of Operations
Psychology Software Tools, Inc.
2050 Ardmore Boulevard
Suite 200
Pittsburgh, PA 15221-4610
Phone     412-271-5040
FAX       412-271-7077
Email     anthony.zuccolotto at pstnet.com
Internet  http://www.pstnet.com/


-----Original Message-----
From: Kai [mailto:kai.osterberg at ymed.lu.se]
Sent: Monday, January 07, 2002 11:12 AM
To: eprime at mail.talkbank.org
Subject: Using visual-analogue scales in E-prime


Dear e-prime users,

Using e-prime, we are trying to program a 20-item questionnaire with
visual-analogue scales (VAS) for the responses. This will require the
movement of an arrow along a line (from 0 to100 percent) in response to
the question; e. g., the stimulus "Do you feel tired ?" would be
presented at the top of the screen, and below would be presented a 0-100
percent response line (with labeled endpoints) and a moveable arrow. The
subject would move the arrow back and forth along the line (preferably
by using the SRBox keys no 1 and 5) in order to fine-tune its position
until it is perceived as represntative for his/her current state. The
subject would then confirm/enter this response by pressing a separate
key, and the next question would appear (and so on).

Problem: We are able to achieve the movement of an arrow along a line,
but only by setting up each small step of arrow movement (i. e. each
key-press) as a separate reaction time (RT) stimulus-response (S-R). But
this leads to serious problems: If the scale resolution is set to 2
percent (0-100% = 50 steps), already moving along the scale once leads
to 50 RT S-R:s. Together with some margin for additional movements, the
number of RT:s must reasonably be set to at least 300 for each question!
This would of course make a 20-item questionnaire extremely large (not
to mention the enormous amount of unwanted data obtained). Obviously
this approach is incorrect. We have not succeeded to solve the riddle of
how make the arrow move back and forth along the VAS-scale in response
to keyboard inputs without making e-prime believe that each arrow
movement represents a RT S-R event. The only two response data of
interest to us is the position of the arrow when the subject makes his
FINAL confirmatory key-press and the decision time.

We would welcome any suggestion of how to properly program this type of
VAS-question within e-prime.

Thanks,

Kai Österberg, PhD
Dept. Occupational and Environmental Medicine
Lund University
SE-22185 Sweden

kai.osterberg at ymed.lu.se
phone +46-46-177292


From michael.allerhand at ed.ac.uk  Wed Jan  9 15:02:27 2002
From: michael.allerhand at ed.ac.uk (mike allerhand)
Date: Wed, 9 Jan 2002 15:02:27 +0000
Subject: fastest refresh
Message-ID: <WED.9.JAN.2002.150227.0000.>

What monitor and graphics card can get presentation
intervals of 5ms (and below if possible)?

Suppose you've got a monitor that can be driven at 160Hz
vertical refresh, and a video card that can drive faster than that,
and has, say, 32Mb on-board RAM.
You've set the lowest resolution and color depth. You use
small images. You set pre-release time
to spare. You select the max refresh rate your monitor can
handle, and tell eprime to present an image for, say, 6.25 ms
(160Hz). Will you get what you want? Not necessarily.
It's not easy to measure. We used a high-end storage 'scope
to measure the response from a photocell. The fact is that
it depends upon magic in the video card and driver.
We found Sony and IIyama monitors that can go to 160Hz,
but you have to get the right card. Just because the card says
it can drive at 200Hz is no guarantee that you will get that
out of eprime. For example we found ATI cards with sufficient
video RAM that claimed to go fast enough could give at
best a mulitple of two refreshes, ie. 12.5ms minimum.
One card we found that does give 6.25ms is Matrox millenium G400 max.

It would be useful to know what people are using to get low
presentation intervals. Can anyone do 5ms or better?

Mike


From JPatte at lsuhsc.edu  Wed Jan  9 16:06:20 2002
From: JPatte at lsuhsc.edu (Patterson, James)
Date: Wed, 9 Jan 2002 10:06:20 -0600
Subject: fastest refresh
Message-ID: <WED.9.JAN.2002.100620.0600.JPATTE@LSUHSC.EDU>

Just curious...why would you want to go that fast?

===========================================
James C. Patterson II, MD/PhD
Director of PET Neuroimaging Research
PET Imaging Center, Biomedical Research Foundation
Assistant Professor of Psychiatry
Louisiana State University Health Sciences Center at Shreveport
318-675-6040 - Psychiatry
318-675-6148 - fax
318-675-4000 - PET Center
318-675-4020 - fax
===========================================




> -----Original Message-----
> From: mike allerhand [mailto:michael.allerhand at ed.ac.uk]
> Sent: Wednesday, January 09, 2002 7:02 AM
> To: eprime at mail.talkbank.org
> Subject: fastest refresh
>
>
> What monitor and graphics card can get presentation
> intervals of 5ms (and below if possible)?
>
> Suppose you've got a monitor that can be driven at 160Hz
> vertical refresh, and a video card that can drive faster than that,
> and has, say, 32Mb on-board RAM.
> You've set the lowest resolution and color depth. You use
> small images. You set pre-release time
> to spare. You select the max refresh rate your monitor can
> handle, and tell eprime to present an image for, say, 6.25 ms
> (160Hz). Will you get what you want? Not necessarily.
> It's not easy to measure. We used a high-end storage 'scope
> to measure the response from a photocell. The fact is that
> it depends upon magic in the video card and driver.
> We found Sony and IIyama monitors that can go to 160Hz,
> but you have to get the right card. Just because the card says
> it can drive at 200Hz is no guarantee that you will get that
> out of eprime. For example we found ATI cards with sufficient
> video RAM that claimed to go fast enough could give at
> best a mulitple of two refreshes, ie. 12.5ms minimum.
> One card we found that does give 6.25ms is Matrox millenium G400 max.
>
> It would be useful to know what people are using to get low
> presentation intervals. Can anyone do 5ms or better?
>
> Mike
>
>
>


From anthony.zuccolotto at pstnet.com  Thu Jan 10 14:00:24 2002
From: anthony.zuccolotto at pstnet.com (Tony Zuccolotto)
Date: Thu, 10 Jan 2002 09:00:24 -0500
Subject: FW: In gratitude
Message-ID: <THU.10.JAN.2002.090024.0500.ANTHONY.ZUCCOLOTTO@PSTNET.COM>

Kai,

Glad to be of assistance.

The solution I gave sounds like it will work, but note that there are
other ways in E-Prime to deal with limiting the logging of data you are
not interested in.

If you run into this situation again it might be worth your programmer
writing a very simple experiment (e.g. 1 List with 1 Procedure and a
TextDisplay with a single response enabled) and then generating the
script and examining it in the script window or by loading the script
(*.ebs) into E-Run.

You will see that each procedure generates a subroutine that holds the
script for that procedure.   If your procedure is named TrialProc then
E-Prime will generate a subroutine named TrialProc_Run.   This procedure
is what is run whenever the TrialProc is called from a List to execute.

The whole logging system in E-Prime works by adding attribute and their
values to the experimental Context.   The Context is a multi-level data
structure that holds all of the attributes and their values that are
currently active in the paradigm.  Attributes can be independent
variables (typically declared on List objects), dependent measures, or
any other type of information you feel is valid for your paradigm and
post-analysis.   You will see the Context being passed into the
TrialProc_Run subroutine as a parameter (named c).

If you examine the TrialProc_Run subroutine you will see script that
adds different attributes to the context at various points in the
subroutine, e.g.
	c.SetAttrib "Stimulus.RT", Stimulus.RT

E-Prime handles most of the management of the Context for, but you can
add or override anything you want in the Context using the c.SetAttrib
method.   You can also pull information from the context using the
c.GetAttrib method.

When it comes time to log at the end of the trial, E-Prime assumes all
the data that is relevant for that trial is in held in the Context and
it then makes a single call to
	c.Log

This call instructs the Context to write all of its relevant data to the
data file on disk.

If you want to handle all logging yourself then you can turn off the
default call to c.Log at the end of the Procedure by setting the LogData
property for the Procedure object to "No" (via the Properties Window in
E-Studio).   After that, it is your responsibility to update the
attribute values in the context and call c.Log as little or as often as
is needed to meet the needs of your paradigm.

There is more information on the Context object in the User's Manual and
E-Basic Help for further detail.

Regards,
Tony


-----Original Message-----
From: Kai [mailto:kai.osterberg at ymed.lu.se]
Sent: Thursday, January 10, 2002 8:36 AM
To: Tony Zuccolotto
Subject: In gratitude


Dear Tony,

Our programmer is now very optimistic after having read your mail.
Thanks a lot for your help!

Kai

---------------------------------------------------------------------
Original message:
Date:         Mon, 7 Jan 2002 11:37:02 -0500
Reply-To:     Tony Zuccolotto
<anthony.zuccolotto at pstnet.com>
Sender:       Eprime List <eprime at STEP.PSY.CMU.EDU>
From:         Tony Zuccolotto
<anthony.zuccolotto at pstnet.com>
Subject:      Re: Using visual-analogue scales in
E-prime
Comments: To: eprime at mail.talkbank.org
Content-Type: text/plain; charset="iso-8859-1"

Dear Kai,

You should be able to achieve this by just using a
Label object in the
procedure and a Goto statement in Inline script.

Put the Label above the object that collects your
input and then after
the object check in script (using an IF statement) if
the subject has
made the 'final' response.  If the 'final' response
was not made then
just process the key as normal and then call Goto
Label1 (replace Label1
with whatever you called your label).

The TrialProc would have the following object on it
        <Label1>        ' designates where to jump back to
        <Stimulus>      ' collects the response
        <Inline>        ' tests for final response, updates
interface
and jumps

Assuming you were using the '3' key on the SRBOX as an
indication of the
'final' response the inline script you would need
would look sometime
like
        If Stimulus.RESP <> "3" Then
                ' move arrow and draw at new location
                ....

                Goto Label1
        End If

Because you jump back to the top of the procedure
logging to the data
file never occurs.   Thus after the final response
comes in you just let
the Procedure end normally and only that 1 trial
should be logged that
contains the final response you are interested in.

If you want the 'total' response time then you should
save the
Stimulus.OnsetTime of the very first trial in a global
variable and then
you can compute a total RT as follows.

        Dim totalRT as Long
        totalRT = Stimulus.RTTime -
g_nOnsetTimeOfFirstStimulus
        c.SetAttrib "TotalRT", totalRT

Hope that helps,
Tony

Anthony P. Zuccolotto
Vice President of Operations
Psychology Software Tools, Inc.
2050 Ardmore Boulevard
Suite 200
Pittsburgh, PA 15221-4610
Phone     412-271-5040
FAX       412-271-7077
Email     anthony.zuccolotto at pstnet.com
Internet  http://www.pstnet.com/


From art80408 at nus.edu.sg  Tue Jan 15 07:45:55 2002
From: art80408 at nus.edu.sg (Ho Kok Inn)
Date: Tue, 15 Jan 2002 15:45:55 +0800
Subject: Addition of feedback
Message-ID: <TUE.15.JAN.2002.154555.0800.ART80408@NUS.EDU.SG>

Hello anyone out there,

Can anyone please enlighten me on how to display different feedbacks in an
experiment?
(say, getting a correct answer for type "A" questions earn you 1 point &
getting a correct answer for type "B" questions earn you 3 points.)

Also, if the above is done, how to add up all these scores that are
displayed in the feedback?

PLEASE HELP- thesis deadline drawing near..............
: )


HKI
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From BSchech at intra.nida.nih.gov  Tue Jan 15 16:58:08 2002
From: BSchech at intra.nida.nih.gov (Schech, Barry (NIDA/IRP))
Date: Tue, 15 Jan 2002 11:58:08 -0500
Subject: Addition of feedback
Message-ID: <TUE.15.JAN.2002.115808.0500.BSCHECH@INTRA.NIDA.NIH.GOV>

I don't know if anyone responded yet to this question but here is how I have
counted and total amounts in one on my projects.

1) Early in the project define the variables such as
         DIM total as integer
         DIM current as integer

    And in the begining put a script such as;
        c.setattrib "Total", total
        c.setattrib "current", current
        current=0

        This will start the project at 0 points or dollars etc. and let you
recall the total and current points/money in a feedback screen.

2) In the list for the project have the following defined (and put in the
answers for each column expected)
        correctanswer
        incorrectanswer
        correctmoney
        incorrectmoney
 ( I used money amounts but you could just use correctanswer and
incorrectanswer)


3) In an inline put something like the following script

 if slide1.RESP =c.GetAttrib ("correctanswer") then    ####slide1 is where
the person was asked to press the appropriate key such as 1 or 2
 total=total + (c.GetAttrib ("correctmoney"))
end if

if slide1.RESP =c.GetAttrib ("incorrectanswer") then
 total=total - (c.GetAttrib ("incorrectmoney"))
end if

if slide1.RESP =c.GetAttrib ("correctanswer") then
 current = (c.GetAttrib ("correctmoney"))
end if

if slide1.RESP =c.GetAttrib ("incorrectanswer") then
 current = (c.GetAttrib ("incorrectmoney"))
end if

c.setattrib "Total", total                 ####This is the raw total
including negative signs
c.setattrib "Total2", abs(total)       ####This strips the negative sign
from the total amount
c.setattrib "current" , current

c.setattrib "sign" , left$ (total,1)    ####This reads the first char. from
the total
if left$ (total,1) <> "-"  then          ###This checks the sign if it is
negative
c.setattrib "sign" , CHR$(32)       ###This assigns the sign to a - so when
I display the dollar amount the neg sign is in front of the $ sign
end if

4) In the feedback screen you can display the total and current amounts by
the following;
        You have just won $[current]
        You total winnings are $[sign] [total2] or
        Your total winnings are [total]       #### If you don't care about
the negative sign before the number


Hope this helps,

Barry Schech
National Institute on Drug Abuse
Baltimore Md.



-----Original Message-----
From: Ho Kok Inn [mailto:art80408 at nus.edu.sg]
Sent: Tuesday, January 15, 2002 2:46 AM
To: 'eprime at mail.talkbank.org'
Subject: Addition of feedback



Hello anyone out there,

Can anyone please enlighten me on how to display different feedbacks in an
experiment?
(say, getting a correct answer for type "A" questions earn you 1 point &
getting a correct answer for type "B" questions earn you 3 points.)

Also, if the above is done, how to add up all these scores that are
displayed in the feedback?

PLEASE HELP- thesis deadline drawing near..............
: )


HKI

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From Jennifer.Thompson at man.ac.uk  Tue Jan 15 17:10:48 2002
From: Jennifer.Thompson at man.ac.uk (Jennifer Thompson)
Date: Tue, 15 Jan 2002 17:10:48 GMT1BST
Subject: timing of multiple responses in E-Prime
Message-ID: <TUE.15.JAN.2002.171048.GMT1BST.>

I hope someone can help me with this, I'm new to eprime (and
haven't used anything similar so starting from a very basic level).

Basically, what I want to do is have people (neurological patients)
repetatively tap a button for a predetermined time period, and look
at the a) number of responses and b) the timing of these
responses.  Reading the manuals I can't see a way to do this, and
EPrime wants to record the time of the LAST response, not all of
them.  What I want it to do is to sample the time of EACH
response, relative to the start signal.

If anyone can put me on the right track or has any suggestions I'd
be most grateful.  Also if the above doesn't make sense then I can
elaborate.

Many thanks,
Jennifer Thompson


From beta at pstnet.com  Tue Jan 15 18:25:43 2002
From: beta at pstnet.com (Beta)
Date: Tue, 15 Jan 2002 13:25:43 -0500
Subject: Addition of feedback
Message-ID: <TUE.15.JAN.2002.132543.0500.BETA@PSTNET.COM>

Dear Dr. Inn,
 
Thank you for your support of E-Prime. You will need to keep a separate
summation variable to look at the Probe.Acc property before feedback.
Summation objects are used to collect a series of observations. From
this collection, various summary measures may be determined, such as
minimum or maximum value in the collection, the number of observations,
and various statistical measures, such as mean, standard deviation, or
variance of the observations within the collection. For more information
about the Summation object, please refer to the E-Basic OnLine Help. You
may access E-Basic OnLine Help within E-Studio via the taskbar and
selecting the Help option.
 
Here is some sample script for your particular experiment, you will need
to place this script in an InLine object before your Feedback object.
Please try the script below and re-run your experiment.
 
If (Probe.ACC=1) Then
    ' Correct so figure out how many points they get
    If c.GetAttrib("TrialType")="TrialThatGets3Points" Then
        MySummation.AddObservation 3
    Else        '
        MySummation.AddObservation 1
    End If
Else
    ' Wrong, may want to sum a 0 here if you are interested in Mean
Points/Trial, if not you can ignore it.
End If
 
' If user needs to display total points in feedback then add to context
and put [TotalPoints] somewhere on feedback tabs...
c.SetAttrib "TotalPoints", MySummation.Total
 
I hope this information is helpful in the completion of your experiment.
 
Sincerely,
Jennifer Gliptis
Technical Consultant
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Psychology Software Tools, Inc.
2050 Ardmore Blvd.
Pittsburgh, PA 15221-4610
USA
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Visit our Web Site for the latest info:
<< http://www.pstnet.com/>>
E-mail: info at pstnet.com
Voice (412) 271-5040 

-----Original Message-----
From: Ho Kok Inn [mailto:art80408 at nus.edu.sg]
Sent: Tuesday, January 15, 2002 2:46 AM
To: 'eprime at mail.talkbank.org'
Subject: Addition of feedback



Hello anyone out there, 

Can anyone please enlighten me on how to display different feedbacks in
an experiment? 
(say, getting a correct answer for type "A" questions earn you 1 point &
getting a correct answer for type "B" questions earn you 3 points.)

Also, if the above is done, how to add up all these scores that are
displayed in the feedback? 

PLEASE HELP- thesis deadline drawing near.............. 
: ) 
  

HKI 

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From zajdeld at ohsu.edu  Thu Jan 17 00:48:24 2002
From: zajdeld at ohsu.edu (Daniel Zajdel)
Date: Wed, 16 Jan 2002 16:48:24 -0800
Subject: Ebasic Changes
Message-ID: <WED.16.JAN.2002.164824.0800.ZAJDELD@OHSU.EDU>

Hello All,

I am in the process of converting some experiment scrips to the new version. Along the way I am discovering little changes here and there. Some things have been simplified, like the .PreReleaseTime object property is now .PreRelease. Easy enough to convert, however it may be that some things are gone now, like the .input property for display objects collecting a response. Neither was mentioned on the website knowledge base, and I didn't find anything about those in the documentation.

I am afraid I get to figure out all these refinements for myself, but is anyone else out there noticing such changes?


Dan Zajdel
Neurology
Oregon Health & Science University


From susanc at andrew.cmu.edu  Thu Jan 17 15:57:40 2002
From: susanc at andrew.cmu.edu (Susan Campbell)
Date: Thu, 17 Jan 2002 10:57:40 -0500
Subject: timing of multiple responses in E-Prime
Message-ID: <THU.17.JAN.2002.105740.0500.>

I'm not certain if anyone has answered your question off-list, but I've
prepared an example script that does muliple response timing and put it
up on the STEP website for people to look at and download.

The script is the third on the page at
http://step.psy.cmu.edu/script_samples/

I tried to find a way to find the time between responses with a minimum
of E-Basic scripting, but apparently the only way to get at the
sub-responses that make up an InputMask object is with scripting.
E-Prime actually collects the responses that make up a multiple-response
trial (InputMask.Responses), but it only records the final RT to the
output data file.  There's a lot of information in the E-Basic help
files (not the E-Studio ones, and not in the manuals that I could find)
about InputMask objects, but I don't know how useful it will be if you
don't have a scripting background.

For the script, I rather hacked up the code from the main InputMask
topic in the E-Basic help such that it collected multiple keyboard
responses per trial.  Their example uses mouse clicks.  I added writing
it to a data file as well, though I couldn't find a good way to add it
to the normal data file E-Prime generates.  There should be copious
comments on the code, but if it's still incomprehensible, please feel
free to let me know and I'll try to clarify.

I hope this helps,
Susan Campbell
STEP E-Prime Programmer




Jennifer Thompson wrote:

> I hope someone can help me with this, I'm new to eprime (and
> haven't used anything similar so starting from a very basic level).
>
> Basically, what I want to do is have people (neurological patients)
> repetatively tap a button for a predetermined time period, and look
> at the a) number of responses and b) the timing of these
> responses.  Reading the manuals I can't see a way to do this, and
> EPrime wants to record the time of the LAST response, not all of
> them.  What I want it to do is to sample the time of EACH
> response, relative to the start signal.
>
> If anyone can put me on the right track or has any suggestions I'd
> be most grateful.  Also if the above doesn't make sense then I can
> elaborate.
>
> Many thanks,
> Jennifer Thompson
>
>


From miw2004 at med.cornell.edu  Thu Jan 17 17:39:13 2002
From: miw2004 at med.cornell.edu (Michael Worden)
Date: Thu, 17 Jan 2002 12:39:13 -0500
Subject: timing of multiple responses in E-Prime
Message-ID: <THU.17.JAN.2002.123913.0500.MIW2004@MED.CORNELL.EDU>

(I tried to send this yesterday but it didn't show up for some reason...)

This is quite simple to do with e-prime.  You just need a list that
calls a single procedure and that exits after a predetermined amount
of time (or number of taps if you like).  The procedure needs a
single object (TextDisplay or whatever) that takes a response and
terminates.  That's it.  Every time the subject taps a new row will
be created in the data file.  To find the interval between taps
simply take the .rttime value for one tap and subtract from it the
.rttime value for the previous tap.

I put together a simple example and you may ftp it from
sacklerinstitute.org as /pub/tap.es. (
ftp://sacklerinstitute.org/pub/tap.es )  This was written with beta5
SP2.  If you convert to v1.0 double check that the input action of
the tap object is set to terminate, the max count (under Advanced) is
set to 1 and the allowable input is set to whatever key you want to
tap.  I believe that Jennifer had some trouble with some of these
values being reset incorrectly.

Good luck,
Michael

Jennifer Thompson wrote:

>I hope someone can help me with this, I'm new to eprime (and haven't
>used anything similar so starting from a very basic level).
>
>Basically, what I want to do is have people (neurological patients)
>repetatively tap a button for a predetermined time period, and look
>at the a) number of responses and b) the timing of these responses.
>Reading the manuals I can't see a way to do this, and EPrime wants
>to record the time of the LAST response, not all of them.  What I
>want it to do is to sample the time of EACH response, relative to
>the start signal.
>
>If anyone can put me on the right track or has any suggestions I'd
>be most grateful.  Also if the above doesn't make sense then I can
>elaborate.
>
>Many thanks,
>Jennifer Thompson

--
__
Michael Worden, PhD                miw2004 at med.cornell.edu
Sackler Institute for Developmental Psychobiology, Box 140
1300 York Ave., NY, NY 10021             Tel: 212 746-5830
http://www.sacklerinstitute.org


From beta at pstnet.com  Thu Jan 17 21:34:00 2002
From: beta at pstnet.com (Beta)
Date: Thu, 17 Jan 2002 16:34:00 -0500
Subject: Ebasic Changes
Message-ID: <THU.17.JAN.2002.163400.0500.BETA@PSTNET.COM>

 Dan,
 
Since your question was entered on the forum as well through web
support, I am posting this response so that others in the forum may see
the answer.
 
The .Input property was replaced in v1.0. As noted in the Knowledge Base
section of our website: "Especially in E-Basic, the input model has
changed to accommodate primarily for multiple response collection and
displaying responses to the screen." However, besides the elimination of
"AnyOf,"  the input model has not really changed; the script for echo
responses and multiple responses is essentially an extension of Beta 5's
input model.  
 
The docs do not describe the use of the new input model in reference to
the old input model because we did not consider it necessary to document
an input model that no longer exists. However, as noted in the web
support Knowledge Base, you will find the new input model thoroughly
documented under the InputMask, ResponseData and RteRunnableInputObject
topics in our OnLine E-Basic Help. 
 
Again, the change from .Input essentially only affects input handled via
script.  We do NOT encourage users to ever write their own input mask
handling script, and there is no real need for users to do so: any input
collection script you need can be generated by E-Studio by simply using
a Wait object with a zero duration and preset input properties.  We do
encourage you to work with the InputMask and ResponseData contents after
input has been collected, and the ways in which to do so are also very
well documented in E-Basic help.  It may also help you to play with the
input properties on a single object E-Studio, then generate the full
script to see each one is used.  Used in this way, E-Studio can be a
great learning tool for users trying to familiarize themselves with
E-Basic.
 
We are currently examining over 1000 line item differences between B5
and v1.0, and we will post them as soon as possible.  We have always
made a real effort to inform users of changes from version to version,
and did release on our website a top level listing of the bug fixes and
other changes between Beta 5 and v1.0.  You can access these from the
web support Knowledge Base page under the heading "Line Item Updates."
 
You are correct that the change from "PreReleaseTime" to "PreRelease"
was not specifically addressed in our documentation or Knowledge Base.
It is mentioned in the line items, but in a somewhat unrelated context.
Again, we didn't believe it necessary to document something that didn't
exist in the final version; however, this information will most likely
be included in the line item differences I mentioned above.
 
In the future, if you have trouble finding information, please submit a
technical support request, and we will be happy to point you to the
appropriate documentation or Help topics, or provide you with any other
information we have.
 
Sincerely,
 
Sara Burgess
Technical Consultant

	-----Original Message----- 
	From: Daniel Zajdel 
	Sent: Wed 1/16/2002 7:48 PM 
	To: eprime at mail.talkbank.org 
	Cc: 
	Subject: Ebasic Changes
	
	

	Hello All,
	
	I am in the process of converting some experiment scrips to the
new version. Along the way I am discovering little changes here and
there. Some things have been simplified, like the .PreReleaseTime object
property is now .PreRelease. Easy enough to convert, however it may be
that some things are gone now, like the .input property for display
objects collecting a response. Neither was mentioned on the website
knowledge base, and I didn't find anything about those in the
documentation.
	
	I am afraid I get to figure out all these refinements for
myself, but is anyone else out there noticing such changes?
	
	
	Dan Zajdel
	Neurology
	Oregon Health & Science University
	
	
	


From jhopper at bu.edu  Fri Jan 18 23:39:20 2002
From: jhopper at bu.edu (Jim Hopper, Ph.D.)
Date: Fri, 18 Jan 2002 18:39:20 -0500
Subject: voice-activated mic input
Message-ID: <FRI.18.JAN.2002.183920.0500.JHOPPER@BU.EDU>

Hello,

I've been having trouble finding a scientifically sound and financially
reasonable solution for voice-activated mic input.

Any recommendations would be greatly appreciated.

Thanks,

Jim Hopper


______________________________________

Jim Hopper, Ph.D.
Research Associate, Dept of Psychiatry
Boston University School of Medicine
_______________________________________


From jmbaker at uncg.edu  Mon Jan 21 17:08:23 2002
From: jmbaker at uncg.edu (Julie M. Baker)
Date: Mon, 21 Jan 2002 12:08:23 -0500
Subject: Data Compatibility
Message-ID: <MON.21.JAN.2002.120823.0500.JMBAKER@UNCG.EDU>

Hello,
I was wondering if anyone has tried to merge data from the beta version of
e-prime with data from the full version. Are the data files compatible? Or
do they all need to come from the same version?

Thanks,
Julie Baker
Dept of Psychology
University of North Carolina - Greensboro


From roy.allen at abdn.ac.uk  Tue Jan 22 16:30:04 2002
From: roy.allen at abdn.ac.uk (Roy Allen)
Date: Tue, 22 Jan 2002 16:30:04 -0000
Subject: Problem
Message-ID: <TUE.22.JAN.2002.163004.0000.>

I wonder if anyone can help. I'm trying to develop experiments
where, on each trial I can present both a visual and an auditory
stimulus. I know that this can be done as a SlideObject but,
crucially, I need to vary the onset times of each stimulus
separately so that: on some trials the auditory stimulus precedes
the visual; on others they are presented simultaneously; and on yet
others the visual stimulus precedes the auditory. Plainly I need to
set up a number of variables but I can't seem to even get E-Prime
to let me present two stimuli in the same trial but at different
onsets.

Thanks in anticipation,

Roy Allen
University of Aberdeen.


From susanc at andrew.cmu.edu  Tue Jan 22 18:36:37 2002
From: susanc at andrew.cmu.edu (Susan Campbell)
Date: Tue, 22 Jan 2002 13:36:37 -0500
Subject: Problem
Message-ID: <TUE.22.JAN.2002.133637.0500.>

One thing to try, if you haven't already, is creating two (or three)
seperate Procedure objects, one with the sound first and one with the
visual first.  Then you can vary which Procedure you use from the list
that controls presentation and duration, though you might need to rework
your duration math a little.

You can probably even use the same sound and visual display objects in
both procedures to minimize the number of different objects required
(though I suppose you'd need to use a combined slide for the
simultaneous condition).  This worked for me on an experiment that
involved having two visual presentations per trial whose order varied
between trials, so I assume it would work for a combination of visual
and auditory stimuli.

There may be other solutions, however.  I haven't done much with the new
SlideObject, so I'm not sure what its capabilities are.

Hope this helps,
Susan Campbell
STEP E-Prime Programmer

Roy Allen wrote:

> I wonder if anyone can help. I'm trying to develop experiments
> where, on each trial I can present both a visual and an auditory
> stimulus. I know that this can be done as a SlideObject but,
> crucially, I need to vary the onset times of each stimulus
> separately so that: on some trials the auditory stimulus precedes
> the visual; on others they are presented simultaneously; and on yet
> others the visual stimulus precedes the auditory. Plainly I need to
> set up a number of variables but I can't seem to even get E-Prime
> to let me present two stimuli in the same trial but at different
> onsets.
>
> Thanks in anticipation,
>
> Roy Allen
> University of Aberdeen.
>
>


From miw2004 at med.cornell.edu  Tue Jan 22 18:40:15 2002
From: miw2004 at med.cornell.edu (Michael Worden)
Date: Tue, 22 Jan 2002 13:40:15 -0500
Subject: Problem
In-Reply-To: <3C4D938C.28000.199A707@localhost>
Message-ID: <TUE.22.JAN.2002.134015.0500.MIW2004@MED.CORNELL.EDU>

A straightforward way to do this is to have two procedures, one
presents stimulus A first and the other presents stimulus B first.
Add a wait or other object in the middle if you want to have variable
ISIs.  I threw together a quick example using two slide objects with
visual stimuli (it's a simple modification to make one of these a
sound object).  You can find the example at
ftp://sacklerinstitute.org/pub/ABexample.es

Good luck,
Michael

>I wonder if anyone can help. I'm trying to develop experiments
>where, on each trial I can present both a visual and an auditory
>stimulus. I know that this can be done as a SlideObject but,
>crucially, I need to vary the onset times of each stimulus
>separately so that: on some trials the auditory stimulus precedes
>the visual; on others they are presented simultaneously; and on yet
>others the visual stimulus precedes the auditory. Plainly I need to
>set up a number of variables but I can't seem to even get E-Prime
>to let me present two stimuli in the same trial but at different
>onsets.
>
>Thanks in anticipation,
>
>Roy Allen
>University of Aberdeen.


--
__
Michael Worden, PhD                miw2004 at med.cornell.edu
Sackler Institute for Developmental Psychobiology, Box 140
1300 York Ave., NY, NY 10021             Tel: 212 746-5830
http://www.sacklerinstitute.org


From susanc at andrew.cmu.edu  Wed Jan 23 15:36:14 2002
From: susanc at andrew.cmu.edu (Susan Campbell)
Date: Wed, 23 Jan 2002 10:36:14 -0500
Subject: Problem
Message-ID: <WED.23.JAN.2002.103614.0500.>

As an addendum, the experiment I mentioned is a replication of the
Eriksen and St. James (1986) study of focal attention.  In some cases,
positions in a display are cued before the display appears, and in other
cases, after.  The experiment is online at:

http://step.psy.cmu.edu/scripts/Eriksen1986.zip

Have a nice day,
Susan

Susan Campbell wrote:

> One thing to try, if you haven't already, is creating two (or three)
> seperate Procedure objects, one with the sound first and one with the
> visual first.  Then you can vary which Procedure you use from the list
> that controls presentation and duration, though you might need to rework
> your duration math a little.
>
> You can probably even use the same sound and visual display objects in
> both procedures to minimize the number of different objects required
> (though I suppose you'd need to use a combined slide for the
> simultaneous condition).  This worked for me on an experiment that
> involved having two visual presentations per trial whose order varied
> between trials, so I assume it would work for a combination of visual
> and auditory stimuli.
>
> There may be other solutions, however.  I haven't done much with the new
> SlideObject, so I'm not sure what its capabilities are.
>
> Hope this helps,
> Susan Campbell
> STEP E-Prime Programmer
>
> Roy Allen wrote:
>
>> I wonder if anyone can help. I'm trying to develop experiments where,
>> on each trial I can present both a visual and an auditory stimulus. I
>> know that this can be done as a SlideObject but, crucially, I need to
>> vary the onset times of each stimulus separately so that: on some
>> trials the auditory stimulus precedes the visual; on others they are
>> presented simultaneously; and on yet others the visual stimulus
>> precedes the auditory. Plainly I need to set up a number of variables
>> but I can't seem to even get E-Prime to let me present two stimuli in
>> the same trial but at different onsets.
>>
>> Thanks in anticipation,
>>
>> Roy Allen
>> University of Aberdeen.
>>
>>
>
>
>


From kai.osterberg at ymed.lu.se  Mon Jan  7 16:11:46 2002
From: kai.osterberg at ymed.lu.se (Kai)
Date: Mon, 7 Jan 2002 17:11:46 +0100
Subject: Using visual-analogue scales in E-prime
Message-ID: <MON.7.JAN.2002.171146.0100.KAI.OSTERBERG@YMED.LU.SE>

Dear e-prime users,

Using e-prime, we are trying to program a 20-item questionnaire with
visual-analogue scales (VAS) for the responses. This will require the
movement of an arrow along a line (from 0 to100 percent) in response to
the question; e. g., the stimulus ?Do you feel tired ?? would be
presented at the top of the screen, and below would be presented a 0-100
percent response line (with labeled endpoints) and a moveable arrow. The
subject would move the arrow back and forth along the line (preferably
by using the SRBox keys no 1 and 5) in order to fine-tune its position
until it is perceived as represntative for his/her current state. The
subject would then confirm/enter this response by pressing a separate
key, and the next question would appear (and so on).

Problem: We are able to achieve the movement of an arrow along a line,
but only by setting up each small step of arrow movement (i. e. each
key-press) as a separate reaction time (RT) stimulus-response (S-R). But
this leads to serious problems: If the scale resolution is set to 2
percent (0-100% = 50 steps), already moving along the scale once leads
to 50 RT S-R:s. Together with some margin for additional movements, the
number of RT:s must reasonably be set to at least 300 for each question!
This would of course make a 20-item questionnaire extremely large (not
to mention the enormous amount of unwanted data obtained). Obviously
this approach is incorrect. We have not succeeded to solve the riddle of
how make the arrow move back and forth along the VAS-scale in response
to keyboard inputs without making e-prime believe that each arrow
movement represents a RT S-R event. The only two response data of
interest to us is the position of the arrow when the subject makes his
FINAL confirmatory key-press and the decision time.

We would welcome any suggestion of how to properly program this type of
VAS-question within e-prime.

Thanks,

Kai ?sterberg, PhD
Dept. Occupational and Environmental Medicine
Lund University
SE-22185 Sweden

kai.osterberg at ymed.lu.se
phone +46-46-177292


From anthony.zuccolotto at pstnet.com  Mon Jan  7 16:37:02 2002
From: anthony.zuccolotto at pstnet.com (Tony Zuccolotto)
Date: Mon, 7 Jan 2002 11:37:02 -0500
Subject: Using visual-analogue scales in E-prime
Message-ID: <MON.7.JAN.2002.113702.0500.ANTHONY.ZUCCOLOTTO@PSTNET.COM>

Dear Kai,

You should be able to achieve this by just using a Label object in the
procedure and a Goto statement in Inline script.

Put the Label above the object that collects your input and then after
the object check in script (using an IF statement) if the subject has
made the 'final' response.  If the 'final' response was not made then
just process the key as normal and then call Goto Label1 (replace Label1
with whatever you called your label).

The TrialProc would have the following object on it
	<Label1>	' designates where to jump back to
	<Stimulus>	' collects the response
	<Inline>	' tests for final response, updates interface
and jumps

Assuming you were using the '3' key on the SRBOX as an indication of the
'final' response the inline script you would need would look sometime
like
	If Stimulus.RESP <> "3" Then
		' move arrow and draw at new location
		....

		Goto Label1
	End If

Because you jump back to the top of the procedure logging to the data
file never occurs.   Thus after the final response comes in you just let
the Procedure end normally and only that 1 trial should be logged that
contains the final response you are interested in.

If you want the 'total' response time then you should save the
Stimulus.OnsetTime of the very first trial in a global variable and then
you can compute a total RT as follows.

	Dim totalRT as Long
	totalRT = Stimulus.RTTime - g_nOnsetTimeOfFirstStimulus
	c.SetAttrib "TotalRT", totalRT

Hope that helps,
Tony

Anthony P. Zuccolotto
Vice President of Operations
Psychology Software Tools, Inc.
2050 Ardmore Boulevard
Suite 200
Pittsburgh, PA 15221-4610
Phone     412-271-5040
FAX       412-271-7077
Email     anthony.zuccolotto at pstnet.com
Internet  http://www.pstnet.com/


-----Original Message-----
From: Kai [mailto:kai.osterberg at ymed.lu.se]
Sent: Monday, January 07, 2002 11:12 AM
To: eprime at mail.talkbank.org
Subject: Using visual-analogue scales in E-prime


Dear e-prime users,

Using e-prime, we are trying to program a 20-item questionnaire with
visual-analogue scales (VAS) for the responses. This will require the
movement of an arrow along a line (from 0 to100 percent) in response to
the question; e. g., the stimulus "Do you feel tired ?" would be
presented at the top of the screen, and below would be presented a 0-100
percent response line (with labeled endpoints) and a moveable arrow. The
subject would move the arrow back and forth along the line (preferably
by using the SRBox keys no 1 and 5) in order to fine-tune its position
until it is perceived as represntative for his/her current state. The
subject would then confirm/enter this response by pressing a separate
key, and the next question would appear (and so on).

Problem: We are able to achieve the movement of an arrow along a line,
but only by setting up each small step of arrow movement (i. e. each
key-press) as a separate reaction time (RT) stimulus-response (S-R). But
this leads to serious problems: If the scale resolution is set to 2
percent (0-100% = 50 steps), already moving along the scale once leads
to 50 RT S-R:s. Together with some margin for additional movements, the
number of RT:s must reasonably be set to at least 300 for each question!
This would of course make a 20-item questionnaire extremely large (not
to mention the enormous amount of unwanted data obtained). Obviously
this approach is incorrect. We have not succeeded to solve the riddle of
how make the arrow move back and forth along the VAS-scale in response
to keyboard inputs without making e-prime believe that each arrow
movement represents a RT S-R event. The only two response data of
interest to us is the position of the arrow when the subject makes his
FINAL confirmatory key-press and the decision time.

We would welcome any suggestion of how to properly program this type of
VAS-question within e-prime.

Thanks,

Kai ?sterberg, PhD
Dept. Occupational and Environmental Medicine
Lund University
SE-22185 Sweden

kai.osterberg at ymed.lu.se
phone +46-46-177292


From michael.allerhand at ed.ac.uk  Wed Jan  9 15:02:27 2002
From: michael.allerhand at ed.ac.uk (mike allerhand)
Date: Wed, 9 Jan 2002 15:02:27 +0000
Subject: fastest refresh
Message-ID: <WED.9.JAN.2002.150227.0000.>

What monitor and graphics card can get presentation
intervals of 5ms (and below if possible)?

Suppose you've got a monitor that can be driven at 160Hz
vertical refresh, and a video card that can drive faster than that,
and has, say, 32Mb on-board RAM.
You've set the lowest resolution and color depth. You use
small images. You set pre-release time
to spare. You select the max refresh rate your monitor can
handle, and tell eprime to present an image for, say, 6.25 ms
(160Hz). Will you get what you want? Not necessarily.
It's not easy to measure. We used a high-end storage 'scope
to measure the response from a photocell. The fact is that
it depends upon magic in the video card and driver.
We found Sony and IIyama monitors that can go to 160Hz,
but you have to get the right card. Just because the card says
it can drive at 200Hz is no guarantee that you will get that
out of eprime. For example we found ATI cards with sufficient
video RAM that claimed to go fast enough could give at
best a mulitple of two refreshes, ie. 12.5ms minimum.
One card we found that does give 6.25ms is Matrox millenium G400 max.

It would be useful to know what people are using to get low
presentation intervals. Can anyone do 5ms or better?

Mike


From JPatte at lsuhsc.edu  Wed Jan  9 16:06:20 2002
From: JPatte at lsuhsc.edu (Patterson, James)
Date: Wed, 9 Jan 2002 10:06:20 -0600
Subject: fastest refresh
Message-ID: <WED.9.JAN.2002.100620.0600.JPATTE@LSUHSC.EDU>

Just curious...why would you want to go that fast?

===========================================
James C. Patterson II, MD/PhD
Director of PET Neuroimaging Research
PET Imaging Center, Biomedical Research Foundation
Assistant Professor of Psychiatry
Louisiana State University Health Sciences Center at Shreveport
318-675-6040 - Psychiatry
318-675-6148 - fax
318-675-4000 - PET Center
318-675-4020 - fax
===========================================




> -----Original Message-----
> From: mike allerhand [mailto:michael.allerhand at ed.ac.uk]
> Sent: Wednesday, January 09, 2002 7:02 AM
> To: eprime at mail.talkbank.org
> Subject: fastest refresh
>
>
> What monitor and graphics card can get presentation
> intervals of 5ms (and below if possible)?
>
> Suppose you've got a monitor that can be driven at 160Hz
> vertical refresh, and a video card that can drive faster than that,
> and has, say, 32Mb on-board RAM.
> You've set the lowest resolution and color depth. You use
> small images. You set pre-release time
> to spare. You select the max refresh rate your monitor can
> handle, and tell eprime to present an image for, say, 6.25 ms
> (160Hz). Will you get what you want? Not necessarily.
> It's not easy to measure. We used a high-end storage 'scope
> to measure the response from a photocell. The fact is that
> it depends upon magic in the video card and driver.
> We found Sony and IIyama monitors that can go to 160Hz,
> but you have to get the right card. Just because the card says
> it can drive at 200Hz is no guarantee that you will get that
> out of eprime. For example we found ATI cards with sufficient
> video RAM that claimed to go fast enough could give at
> best a mulitple of two refreshes, ie. 12.5ms minimum.
> One card we found that does give 6.25ms is Matrox millenium G400 max.
>
> It would be useful to know what people are using to get low
> presentation intervals. Can anyone do 5ms or better?
>
> Mike
>
>
>


From anthony.zuccolotto at pstnet.com  Thu Jan 10 14:00:24 2002
From: anthony.zuccolotto at pstnet.com (Tony Zuccolotto)
Date: Thu, 10 Jan 2002 09:00:24 -0500
Subject: FW: In gratitude
Message-ID: <THU.10.JAN.2002.090024.0500.ANTHONY.ZUCCOLOTTO@PSTNET.COM>

Kai,

Glad to be of assistance.

The solution I gave sounds like it will work, but note that there are
other ways in E-Prime to deal with limiting the logging of data you are
not interested in.

If you run into this situation again it might be worth your programmer
writing a very simple experiment (e.g. 1 List with 1 Procedure and a
TextDisplay with a single response enabled) and then generating the
script and examining it in the script window or by loading the script
(*.ebs) into E-Run.

You will see that each procedure generates a subroutine that holds the
script for that procedure.   If your procedure is named TrialProc then
E-Prime will generate a subroutine named TrialProc_Run.   This procedure
is what is run whenever the TrialProc is called from a List to execute.

The whole logging system in E-Prime works by adding attribute and their
values to the experimental Context.   The Context is a multi-level data
structure that holds all of the attributes and their values that are
currently active in the paradigm.  Attributes can be independent
variables (typically declared on List objects), dependent measures, or
any other type of information you feel is valid for your paradigm and
post-analysis.   You will see the Context being passed into the
TrialProc_Run subroutine as a parameter (named c).

If you examine the TrialProc_Run subroutine you will see script that
adds different attributes to the context at various points in the
subroutine, e.g.
	c.SetAttrib "Stimulus.RT", Stimulus.RT

E-Prime handles most of the management of the Context for, but you can
add or override anything you want in the Context using the c.SetAttrib
method.   You can also pull information from the context using the
c.GetAttrib method.

When it comes time to log at the end of the trial, E-Prime assumes all
the data that is relevant for that trial is in held in the Context and
it then makes a single call to
	c.Log

This call instructs the Context to write all of its relevant data to the
data file on disk.

If you want to handle all logging yourself then you can turn off the
default call to c.Log at the end of the Procedure by setting the LogData
property for the Procedure object to "No" (via the Properties Window in
E-Studio).   After that, it is your responsibility to update the
attribute values in the context and call c.Log as little or as often as
is needed to meet the needs of your paradigm.

There is more information on the Context object in the User's Manual and
E-Basic Help for further detail.

Regards,
Tony


-----Original Message-----
From: Kai [mailto:kai.osterberg at ymed.lu.se]
Sent: Thursday, January 10, 2002 8:36 AM
To: Tony Zuccolotto
Subject: In gratitude


Dear Tony,

Our programmer is now very optimistic after having read your mail.
Thanks a lot for your help!

Kai

---------------------------------------------------------------------
Original message:
Date:         Mon, 7 Jan 2002 11:37:02 -0500
Reply-To:     Tony Zuccolotto
<anthony.zuccolotto at pstnet.com>
Sender:       Eprime List <eprime at STEP.PSY.CMU.EDU>
From:         Tony Zuccolotto
<anthony.zuccolotto at pstnet.com>
Subject:      Re: Using visual-analogue scales in
E-prime
Comments: To: eprime at mail.talkbank.org
Content-Type: text/plain; charset="iso-8859-1"

Dear Kai,

You should be able to achieve this by just using a
Label object in the
procedure and a Goto statement in Inline script.

Put the Label above the object that collects your
input and then after
the object check in script (using an IF statement) if
the subject has
made the 'final' response.  If the 'final' response
was not made then
just process the key as normal and then call Goto
Label1 (replace Label1
with whatever you called your label).

The TrialProc would have the following object on it
        <Label1>        ' designates where to jump back to
        <Stimulus>      ' collects the response
        <Inline>        ' tests for final response, updates
interface
and jumps

Assuming you were using the '3' key on the SRBOX as an
indication of the
'final' response the inline script you would need
would look sometime
like
        If Stimulus.RESP <> "3" Then
                ' move arrow and draw at new location
                ....

                Goto Label1
        End If

Because you jump back to the top of the procedure
logging to the data
file never occurs.   Thus after the final response
comes in you just let
the Procedure end normally and only that 1 trial
should be logged that
contains the final response you are interested in.

If you want the 'total' response time then you should
save the
Stimulus.OnsetTime of the very first trial in a global
variable and then
you can compute a total RT as follows.

        Dim totalRT as Long
        totalRT = Stimulus.RTTime -
g_nOnsetTimeOfFirstStimulus
        c.SetAttrib "TotalRT", totalRT

Hope that helps,
Tony

Anthony P. Zuccolotto
Vice President of Operations
Psychology Software Tools, Inc.
2050 Ardmore Boulevard
Suite 200
Pittsburgh, PA 15221-4610
Phone     412-271-5040
FAX       412-271-7077
Email     anthony.zuccolotto at pstnet.com
Internet  http://www.pstnet.com/


From art80408 at nus.edu.sg  Tue Jan 15 07:45:55 2002
From: art80408 at nus.edu.sg (Ho Kok Inn)
Date: Tue, 15 Jan 2002 15:45:55 +0800
Subject: Addition of feedback
Message-ID: <TUE.15.JAN.2002.154555.0800.ART80408@NUS.EDU.SG>

Hello anyone out there,

Can anyone please enlighten me on how to display different feedbacks in an
experiment?
(say, getting a correct answer for type "A" questions earn you 1 point &
getting a correct answer for type "B" questions earn you 3 points.)

Also, if the above is done, how to add up all these scores that are
displayed in the feedback?

PLEASE HELP- thesis deadline drawing near..............
: )


HKI
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From BSchech at intra.nida.nih.gov  Tue Jan 15 16:58:08 2002
From: BSchech at intra.nida.nih.gov (Schech, Barry (NIDA/IRP))
Date: Tue, 15 Jan 2002 11:58:08 -0500
Subject: Addition of feedback
Message-ID: <TUE.15.JAN.2002.115808.0500.BSCHECH@INTRA.NIDA.NIH.GOV>

I don't know if anyone responded yet to this question but here is how I have
counted and total amounts in one on my projects.

1) Early in the project define the variables such as
         DIM total as integer
         DIM current as integer

    And in the begining put a script such as;
        c.setattrib "Total", total
        c.setattrib "current", current
        current=0

        This will start the project at 0 points or dollars etc. and let you
recall the total and current points/money in a feedback screen.

2) In the list for the project have the following defined (and put in the
answers for each column expected)
        correctanswer
        incorrectanswer
        correctmoney
        incorrectmoney
 ( I used money amounts but you could just use correctanswer and
incorrectanswer)


3) In an inline put something like the following script

 if slide1.RESP =c.GetAttrib ("correctanswer") then    ####slide1 is where
the person was asked to press the appropriate key such as 1 or 2
 total=total + (c.GetAttrib ("correctmoney"))
end if

if slide1.RESP =c.GetAttrib ("incorrectanswer") then
 total=total - (c.GetAttrib ("incorrectmoney"))
end if

if slide1.RESP =c.GetAttrib ("correctanswer") then
 current = (c.GetAttrib ("correctmoney"))
end if

if slide1.RESP =c.GetAttrib ("incorrectanswer") then
 current = (c.GetAttrib ("incorrectmoney"))
end if

c.setattrib "Total", total                 ####This is the raw total
including negative signs
c.setattrib "Total2", abs(total)       ####This strips the negative sign
from the total amount
c.setattrib "current" , current

c.setattrib "sign" , left$ (total,1)    ####This reads the first char. from
the total
if left$ (total,1) <> "-"  then          ###This checks the sign if it is
negative
c.setattrib "sign" , CHR$(32)       ###This assigns the sign to a - so when
I display the dollar amount the neg sign is in front of the $ sign
end if

4) In the feedback screen you can display the total and current amounts by
the following;
        You have just won $[current]
        You total winnings are $[sign] [total2] or
        Your total winnings are [total]       #### If you don't care about
the negative sign before the number


Hope this helps,

Barry Schech
National Institute on Drug Abuse
Baltimore Md.



-----Original Message-----
From: Ho Kok Inn [mailto:art80408 at nus.edu.sg]
Sent: Tuesday, January 15, 2002 2:46 AM
To: 'eprime at mail.talkbank.org'
Subject: Addition of feedback



Hello anyone out there,

Can anyone please enlighten me on how to display different feedbacks in an
experiment?
(say, getting a correct answer for type "A" questions earn you 1 point &
getting a correct answer for type "B" questions earn you 3 points.)

Also, if the above is done, how to add up all these scores that are
displayed in the feedback?

PLEASE HELP- thesis deadline drawing near..............
: )


HKI

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From Jennifer.Thompson at man.ac.uk  Tue Jan 15 17:10:48 2002
From: Jennifer.Thompson at man.ac.uk (Jennifer Thompson)
Date: Tue, 15 Jan 2002 17:10:48 GMT1BST
Subject: timing of multiple responses in E-Prime
Message-ID: <TUE.15.JAN.2002.171048.GMT1BST.>

I hope someone can help me with this, I'm new to eprime (and
haven't used anything similar so starting from a very basic level).

Basically, what I want to do is have people (neurological patients)
repetatively tap a button for a predetermined time period, and look
at the a) number of responses and b) the timing of these
responses.  Reading the manuals I can't see a way to do this, and
EPrime wants to record the time of the LAST response, not all of
them.  What I want it to do is to sample the time of EACH
response, relative to the start signal.

If anyone can put me on the right track or has any suggestions I'd
be most grateful.  Also if the above doesn't make sense then I can
elaborate.

Many thanks,
Jennifer Thompson


From beta at pstnet.com  Tue Jan 15 18:25:43 2002
From: beta at pstnet.com (Beta)
Date: Tue, 15 Jan 2002 13:25:43 -0500
Subject: Addition of feedback
Message-ID: <TUE.15.JAN.2002.132543.0500.BETA@PSTNET.COM>

Dear Dr. Inn,
 
Thank you for your support of E-Prime. You will need to keep a separate
summation variable to look at the Probe.Acc property before feedback.
Summation objects are used to collect a series of observations. From
this collection, various summary measures may be determined, such as
minimum or maximum value in the collection, the number of observations,
and various statistical measures, such as mean, standard deviation, or
variance of the observations within the collection. For more information
about the Summation object, please refer to the E-Basic OnLine Help. You
may access E-Basic OnLine Help within E-Studio via the taskbar and
selecting the Help option.
 
Here is some sample script for your particular experiment, you will need
to place this script in an InLine object before your Feedback object.
Please try the script below and re-run your experiment.
 
If (Probe.ACC=1) Then
    ' Correct so figure out how many points they get
    If c.GetAttrib("TrialType")="TrialThatGets3Points" Then
        MySummation.AddObservation 3
    Else        '
        MySummation.AddObservation 1
    End If
Else
    ' Wrong, may want to sum a 0 here if you are interested in Mean
Points/Trial, if not you can ignore it.
End If
 
' If user needs to display total points in feedback then add to context
and put [TotalPoints] somewhere on feedback tabs...
c.SetAttrib "TotalPoints", MySummation.Total
 
I hope this information is helpful in the completion of your experiment.
 
Sincerely,
Jennifer Gliptis
Technical Consultant
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Psychology Software Tools, Inc.
2050 Ardmore Blvd.
Pittsburgh, PA 15221-4610
USA
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Visit our Web Site for the latest info:
<< http://www.pstnet.com/>>
E-mail: info at pstnet.com
Voice (412) 271-5040 

-----Original Message-----
From: Ho Kok Inn [mailto:art80408 at nus.edu.sg]
Sent: Tuesday, January 15, 2002 2:46 AM
To: 'eprime at mail.talkbank.org'
Subject: Addition of feedback



Hello anyone out there, 

Can anyone please enlighten me on how to display different feedbacks in
an experiment? 
(say, getting a correct answer for type "A" questions earn you 1 point &
getting a correct answer for type "B" questions earn you 3 points.)

Also, if the above is done, how to add up all these scores that are
displayed in the feedback? 

PLEASE HELP- thesis deadline drawing near.............. 
: ) 
  

HKI 

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From zajdeld at ohsu.edu  Thu Jan 17 00:48:24 2002
From: zajdeld at ohsu.edu (Daniel Zajdel)
Date: Wed, 16 Jan 2002 16:48:24 -0800
Subject: Ebasic Changes
Message-ID: <WED.16.JAN.2002.164824.0800.ZAJDELD@OHSU.EDU>

Hello All,

I am in the process of converting some experiment scrips to the new version. Along the way I am discovering little changes here and there. Some things have been simplified, like the .PreReleaseTime object property is now .PreRelease. Easy enough to convert, however it may be that some things are gone now, like the .input property for display objects collecting a response. Neither was mentioned on the website knowledge base, and I didn't find anything about those in the documentation.

I am afraid I get to figure out all these refinements for myself, but is anyone else out there noticing such changes?


Dan Zajdel
Neurology
Oregon Health & Science University


From susanc at andrew.cmu.edu  Thu Jan 17 15:57:40 2002
From: susanc at andrew.cmu.edu (Susan Campbell)
Date: Thu, 17 Jan 2002 10:57:40 -0500
Subject: timing of multiple responses in E-Prime
Message-ID: <THU.17.JAN.2002.105740.0500.>

I'm not certain if anyone has answered your question off-list, but I've
prepared an example script that does muliple response timing and put it
up on the STEP website for people to look at and download.

The script is the third on the page at
http://step.psy.cmu.edu/script_samples/

I tried to find a way to find the time between responses with a minimum
of E-Basic scripting, but apparently the only way to get at the
sub-responses that make up an InputMask object is with scripting.
E-Prime actually collects the responses that make up a multiple-response
trial (InputMask.Responses), but it only records the final RT to the
output data file.  There's a lot of information in the E-Basic help
files (not the E-Studio ones, and not in the manuals that I could find)
about InputMask objects, but I don't know how useful it will be if you
don't have a scripting background.

For the script, I rather hacked up the code from the main InputMask
topic in the E-Basic help such that it collected multiple keyboard
responses per trial.  Their example uses mouse clicks.  I added writing
it to a data file as well, though I couldn't find a good way to add it
to the normal data file E-Prime generates.  There should be copious
comments on the code, but if it's still incomprehensible, please feel
free to let me know and I'll try to clarify.

I hope this helps,
Susan Campbell
STEP E-Prime Programmer




Jennifer Thompson wrote:

> I hope someone can help me with this, I'm new to eprime (and
> haven't used anything similar so starting from a very basic level).
>
> Basically, what I want to do is have people (neurological patients)
> repetatively tap a button for a predetermined time period, and look
> at the a) number of responses and b) the timing of these
> responses.  Reading the manuals I can't see a way to do this, and
> EPrime wants to record the time of the LAST response, not all of
> them.  What I want it to do is to sample the time of EACH
> response, relative to the start signal.
>
> If anyone can put me on the right track or has any suggestions I'd
> be most grateful.  Also if the above doesn't make sense then I can
> elaborate.
>
> Many thanks,
> Jennifer Thompson
>
>


From miw2004 at med.cornell.edu  Thu Jan 17 17:39:13 2002
From: miw2004 at med.cornell.edu (Michael Worden)
Date: Thu, 17 Jan 2002 12:39:13 -0500
Subject: timing of multiple responses in E-Prime
Message-ID: <THU.17.JAN.2002.123913.0500.MIW2004@MED.CORNELL.EDU>

(I tried to send this yesterday but it didn't show up for some reason...)

This is quite simple to do with e-prime.  You just need a list that
calls a single procedure and that exits after a predetermined amount
of time (or number of taps if you like).  The procedure needs a
single object (TextDisplay or whatever) that takes a response and
terminates.  That's it.  Every time the subject taps a new row will
be created in the data file.  To find the interval between taps
simply take the .rttime value for one tap and subtract from it the
.rttime value for the previous tap.

I put together a simple example and you may ftp it from
sacklerinstitute.org as /pub/tap.es. (
ftp://sacklerinstitute.org/pub/tap.es )  This was written with beta5
SP2.  If you convert to v1.0 double check that the input action of
the tap object is set to terminate, the max count (under Advanced) is
set to 1 and the allowable input is set to whatever key you want to
tap.  I believe that Jennifer had some trouble with some of these
values being reset incorrectly.

Good luck,
Michael

Jennifer Thompson wrote:

>I hope someone can help me with this, I'm new to eprime (and haven't
>used anything similar so starting from a very basic level).
>
>Basically, what I want to do is have people (neurological patients)
>repetatively tap a button for a predetermined time period, and look
>at the a) number of responses and b) the timing of these responses.
>Reading the manuals I can't see a way to do this, and EPrime wants
>to record the time of the LAST response, not all of them.  What I
>want it to do is to sample the time of EACH response, relative to
>the start signal.
>
>If anyone can put me on the right track or has any suggestions I'd
>be most grateful.  Also if the above doesn't make sense then I can
>elaborate.
>
>Many thanks,
>Jennifer Thompson

--
__
Michael Worden, PhD                miw2004 at med.cornell.edu
Sackler Institute for Developmental Psychobiology, Box 140
1300 York Ave., NY, NY 10021             Tel: 212 746-5830
http://www.sacklerinstitute.org


From beta at pstnet.com  Thu Jan 17 21:34:00 2002
From: beta at pstnet.com (Beta)
Date: Thu, 17 Jan 2002 16:34:00 -0500
Subject: Ebasic Changes
Message-ID: <THU.17.JAN.2002.163400.0500.BETA@PSTNET.COM>

 Dan,
 
Since your question was entered on the forum as well through web
support, I am posting this response so that others in the forum may see
the answer.
 
The .Input property was replaced in v1.0. As noted in the Knowledge Base
section of our website: "Especially in E-Basic, the input model has
changed to accommodate primarily for multiple response collection and
displaying responses to the screen." However, besides the elimination of
"AnyOf,"  the input model has not really changed; the script for echo
responses and multiple responses is essentially an extension of Beta 5's
input model.  
 
The docs do not describe the use of the new input model in reference to
the old input model because we did not consider it necessary to document
an input model that no longer exists. However, as noted in the web
support Knowledge Base, you will find the new input model thoroughly
documented under the InputMask, ResponseData and RteRunnableInputObject
topics in our OnLine E-Basic Help. 
 
Again, the change from .Input essentially only affects input handled via
script.  We do NOT encourage users to ever write their own input mask
handling script, and there is no real need for users to do so: any input
collection script you need can be generated by E-Studio by simply using
a Wait object with a zero duration and preset input properties.  We do
encourage you to work with the InputMask and ResponseData contents after
input has been collected, and the ways in which to do so are also very
well documented in E-Basic help.  It may also help you to play with the
input properties on a single object E-Studio, then generate the full
script to see each one is used.  Used in this way, E-Studio can be a
great learning tool for users trying to familiarize themselves with
E-Basic.
 
We are currently examining over 1000 line item differences between B5
and v1.0, and we will post them as soon as possible.  We have always
made a real effort to inform users of changes from version to version,
and did release on our website a top level listing of the bug fixes and
other changes between Beta 5 and v1.0.  You can access these from the
web support Knowledge Base page under the heading "Line Item Updates."
 
You are correct that the change from "PreReleaseTime" to "PreRelease"
was not specifically addressed in our documentation or Knowledge Base.
It is mentioned in the line items, but in a somewhat unrelated context.
Again, we didn't believe it necessary to document something that didn't
exist in the final version; however, this information will most likely
be included in the line item differences I mentioned above.
 
In the future, if you have trouble finding information, please submit a
technical support request, and we will be happy to point you to the
appropriate documentation or Help topics, or provide you with any other
information we have.
 
Sincerely,
 
Sara Burgess
Technical Consultant

	-----Original Message----- 
	From: Daniel Zajdel 
	Sent: Wed 1/16/2002 7:48 PM 
	To: eprime at mail.talkbank.org 
	Cc: 
	Subject: Ebasic Changes
	
	

	Hello All,
	
	I am in the process of converting some experiment scrips to the
new version. Along the way I am discovering little changes here and
there. Some things have been simplified, like the .PreReleaseTime object
property is now .PreRelease. Easy enough to convert, however it may be
that some things are gone now, like the .input property for display
objects collecting a response. Neither was mentioned on the website
knowledge base, and I didn't find anything about those in the
documentation.
	
	I am afraid I get to figure out all these refinements for
myself, but is anyone else out there noticing such changes?
	
	
	Dan Zajdel
	Neurology
	Oregon Health & Science University
	
	
	


From jhopper at bu.edu  Fri Jan 18 23:39:20 2002
From: jhopper at bu.edu (Jim Hopper, Ph.D.)
Date: Fri, 18 Jan 2002 18:39:20 -0500
Subject: voice-activated mic input
Message-ID: <FRI.18.JAN.2002.183920.0500.JHOPPER@BU.EDU>

Hello,

I've been having trouble finding a scientifically sound and financially
reasonable solution for voice-activated mic input.

Any recommendations would be greatly appreciated.

Thanks,

Jim Hopper


______________________________________

Jim Hopper, Ph.D.
Research Associate, Dept of Psychiatry
Boston University School of Medicine
_______________________________________


From jmbaker at uncg.edu  Mon Jan 21 17:08:23 2002
From: jmbaker at uncg.edu (Julie M. Baker)
Date: Mon, 21 Jan 2002 12:08:23 -0500
Subject: Data Compatibility
Message-ID: <MON.21.JAN.2002.120823.0500.JMBAKER@UNCG.EDU>

Hello,
I was wondering if anyone has tried to merge data from the beta version of
e-prime with data from the full version. Are the data files compatible? Or
do they all need to come from the same version?

Thanks,
Julie Baker
Dept of Psychology
University of North Carolina - Greensboro


From roy.allen at abdn.ac.uk  Tue Jan 22 16:30:04 2002
From: roy.allen at abdn.ac.uk (Roy Allen)
Date: Tue, 22 Jan 2002 16:30:04 -0000
Subject: Problem
Message-ID: <TUE.22.JAN.2002.163004.0000.>

I wonder if anyone can help. I'm trying to develop experiments
where, on each trial I can present both a visual and an auditory
stimulus. I know that this can be done as a SlideObject but,
crucially, I need to vary the onset times of each stimulus
separately so that: on some trials the auditory stimulus precedes
the visual; on others they are presented simultaneously; and on yet
others the visual stimulus precedes the auditory. Plainly I need to
set up a number of variables but I can't seem to even get E-Prime
to let me present two stimuli in the same trial but at different
onsets.

Thanks in anticipation,

Roy Allen
University of Aberdeen.


From susanc at andrew.cmu.edu  Tue Jan 22 18:36:37 2002
From: susanc at andrew.cmu.edu (Susan Campbell)
Date: Tue, 22 Jan 2002 13:36:37 -0500
Subject: Problem
Message-ID: <TUE.22.JAN.2002.133637.0500.>

One thing to try, if you haven't already, is creating two (or three)
seperate Procedure objects, one with the sound first and one with the
visual first.  Then you can vary which Procedure you use from the list
that controls presentation and duration, though you might need to rework
your duration math a little.

You can probably even use the same sound and visual display objects in
both procedures to minimize the number of different objects required
(though I suppose you'd need to use a combined slide for the
simultaneous condition).  This worked for me on an experiment that
involved having two visual presentations per trial whose order varied
between trials, so I assume it would work for a combination of visual
and auditory stimuli.

There may be other solutions, however.  I haven't done much with the new
SlideObject, so I'm not sure what its capabilities are.

Hope this helps,
Susan Campbell
STEP E-Prime Programmer

Roy Allen wrote:

> I wonder if anyone can help. I'm trying to develop experiments
> where, on each trial I can present both a visual and an auditory
> stimulus. I know that this can be done as a SlideObject but,
> crucially, I need to vary the onset times of each stimulus
> separately so that: on some trials the auditory stimulus precedes
> the visual; on others they are presented simultaneously; and on yet
> others the visual stimulus precedes the auditory. Plainly I need to
> set up a number of variables but I can't seem to even get E-Prime
> to let me present two stimuli in the same trial but at different
> onsets.
>
> Thanks in anticipation,
>
> Roy Allen
> University of Aberdeen.
>
>


From miw2004 at med.cornell.edu  Tue Jan 22 18:40:15 2002
From: miw2004 at med.cornell.edu (Michael Worden)
Date: Tue, 22 Jan 2002 13:40:15 -0500
Subject: Problem
In-Reply-To: <3C4D938C.28000.199A707@localhost>
Message-ID: <TUE.22.JAN.2002.134015.0500.MIW2004@MED.CORNELL.EDU>

A straightforward way to do this is to have two procedures, one
presents stimulus A first and the other presents stimulus B first.
Add a wait or other object in the middle if you want to have variable
ISIs.  I threw together a quick example using two slide objects with
visual stimuli (it's a simple modification to make one of these a
sound object).  You can find the example at
ftp://sacklerinstitute.org/pub/ABexample.es

Good luck,
Michael

>I wonder if anyone can help. I'm trying to develop experiments
>where, on each trial I can present both a visual and an auditory
>stimulus. I know that this can be done as a SlideObject but,
>crucially, I need to vary the onset times of each stimulus
>separately so that: on some trials the auditory stimulus precedes
>the visual; on others they are presented simultaneously; and on yet
>others the visual stimulus precedes the auditory. Plainly I need to
>set up a number of variables but I can't seem to even get E-Prime
>to let me present two stimuli in the same trial but at different
>onsets.
>
>Thanks in anticipation,
>
>Roy Allen
>University of Aberdeen.


--
__
Michael Worden, PhD                miw2004 at med.cornell.edu
Sackler Institute for Developmental Psychobiology, Box 140
1300 York Ave., NY, NY 10021             Tel: 212 746-5830
http://www.sacklerinstitute.org


From susanc at andrew.cmu.edu  Wed Jan 23 15:36:14 2002
From: susanc at andrew.cmu.edu (Susan Campbell)
Date: Wed, 23 Jan 2002 10:36:14 -0500
Subject: Problem
Message-ID: <WED.23.JAN.2002.103614.0500.>

As an addendum, the experiment I mentioned is a replication of the
Eriksen and St. James (1986) study of focal attention.  In some cases,
positions in a display are cued before the display appears, and in other
cases, after.  The experiment is online at:

http://step.psy.cmu.edu/scripts/Eriksen1986.zip

Have a nice day,
Susan

Susan Campbell wrote:

> One thing to try, if you haven't already, is creating two (or three)
> seperate Procedure objects, one with the sound first and one with the
> visual first.  Then you can vary which Procedure you use from the list
> that controls presentation and duration, though you might need to rework
> your duration math a little.
>
> You can probably even use the same sound and visual display objects in
> both procedures to minimize the number of different objects required
> (though I suppose you'd need to use a combined slide for the
> simultaneous condition).  This worked for me on an experiment that
> involved having two visual presentations per trial whose order varied
> between trials, so I assume it would work for a combination of visual
> and auditory stimuli.
>
> There may be other solutions, however.  I haven't done much with the new
> SlideObject, so I'm not sure what its capabilities are.
>
> Hope this helps,
> Susan Campbell
> STEP E-Prime Programmer
>
> Roy Allen wrote:
>
>> I wonder if anyone can help. I'm trying to develop experiments where,
>> on each trial I can present both a visual and an auditory stimulus. I
>> know that this can be done as a SlideObject but, crucially, I need to
>> vary the onset times of each stimulus separately so that: on some
>> trials the auditory stimulus precedes the visual; on others they are
>> presented simultaneously; and on yet others the visual stimulus
>> precedes the auditory. Plainly I need to set up a number of variables
>> but I can't seem to even get E-Prime to let me present two stimuli in
>> the same trial but at different onsets.
>>
>> Thanks in anticipation,
>>
>> Roy Allen
>> University of Aberdeen.
>>
>>
>
>
>