Stimulus marker

[David McFarlane]

Juan,

1) The name of the object referenced in the 
Custom field of the Task Event must match the 
name of the stimulus object that gets the 
response.  "StimSlide" was just an example.  If 
your stimulus object is named "Target", then you 
must use "[Target.ACC]" (and BTW, capitalization does not matter).

2) Yes, the dependent measure logging is just for 
the purpose of creating an attribute so that when 
the Task Event calls for that attribute, it 
exists (although you probably want to log it anyway).

3) Did you set PreRelease of Target to 0?  That alone might cause your error.

4) In a pinch, you might add an inline object 
between Target and MarkerWait just to explicitly set the attribute:

     c.SetAttrib "Target.ACC", Target.ACC

but this may also fail if you do not set the 
PreRelease of Target to 0 (think about it).


To be sure, I threw together a little demo of my 
own, and it ran without any problem as long as I 
enabled the proper logging.  If I turned off 
logging, then I got the "attribute does not 
exist" runtime error.  Just set Data Logging of 
Target to "Standard" to be sure.

For the record, my test program still ran even 
with PreRelease set to "(same as duration)", but 
I expect that it did not produce the correct 
output.  I did not hook up anything to look at 
the output signals, so this was not a complete 
test, but as I said at least the program did not crash.

Regards,
-- David McFarlane


At 9/23/2014 04:58 PM Tuesday, juan concepcion wrote:
>Well I've tried it but no success.
>
>I get this report (adjunct to this e-mail).
>
>It says that it could not find the attribute 
>StimSlide.ACC. I've tried changing the name of 
>instead of StimSlide.ACC to Target.ACC because 
>the slide in my experiment is called Target. 
>Also, I've checked the ACC dependent measure logging.
>
>One question: (is this for the purpose to create 
>an attribute so that when the task event calls for that attribute, it exists?).
>
>Also I've tried it for a Cue slide. To the cue 
>slide I've added: Onset and Offset. It did not 
>yielded results since I can not get pass the aboved mentioned error.
>
>Best reguards,
>
>Juan
>
>
>
>On Tue, Sep 23, 2014 at 12:15 PM, juan 
>concepcion <<mailto:elmoro5185 at gmail.com>elmoro5185 at gmail.com> wrote:
>Thank you for the fast response. I will carefully look at the advice.
>
>Thanks alot!!
>
>Juan
>
>On Tue, Sep 23, 2014 at 11:53 AM, David 
>McFarlane <<mailto:mcfarla9 at msu.edu>mcfarla9 at msu.edu> wrote:
>Juan,
>
>Once again, if you use EP2.0.10 or later, I 
>think you can do this better with Task Events 
>than with inline code.  How about the following:
>
>Suppose you use the object StimSlide to get your 
>subject response.  Make sure that it logs 
>StimSlide.ACC; you might also have to set its 
>PreRelease to 0 to make sure that E-Prime sets 
>the StimSlide.ACC attribute before executing the 
>next object.  Set up your trial Procedure something like
>
>Â  Â  ...
>Â  Â  StimSlide
>Â  Â  MarkerWait
>Â  Â  ...
>
>MarkerWait is a Wait object with a Duration of 
>0.  Add a Task Event at StartTime, ActionTime, 
>or OnsetTime (in this case it hardly matters 
>which, if you want to know the difference please 
>see 
><https://groups.google.com/d/topic/e-prime/OeiZ00V9SRc>https://groups.google.com/d/topic/e-prime/OeiZ00V9SRc 
>).   Set it to use your communications device 
>(ParallelPort, Serial, etc.).  Use WriteString 
>as the Action, "(custom)" as the Source, 
>"[StimSlide.ACC]" for Custom, String for Data 
>Type; leave Delay at 0, and Enabled at Yes.
>
>The key is the Custom value for the Task 
>Event.  If StimSlide is set to log .ACC, then 
>E-Prime will automatically create the 
>StimSlide.ACC attribute (though you might have 
>to set PreRelease to 0 to make sure that 
>MarkerWait does not try to use that attribute 
>before its value is set!).  Then MarkerWait can 
>use that as an attribute reference in the Custom value.
>
>I have not tested this out myself, so I will be 
>very interested to learn what you get to work.  Please write back.
>
>-----
>David McFarlane
>E-Prime training 
>online:Â 
><http://psychology.msu.edu/Workshops_Courses/eprime.aspx>http://psychology.msu.edu/Workshops_Courses/eprime.aspx
>Twitter:Â  @EPrimeMaster 
>(<https://twitter.com/EPrimeMaster>https://twitter.com/EPrimeMaster)
>
>/----
>Stock reminder:  1) I do not work for PST.  2) 
>You may reach PST's trained staff (and other 
>support facilities) at 
><https://support.pstnet.com>https://support.pstnet.com 
>.  3) If you do get an answer from PST staff, 
>please extend the courtesy of posting their 
>reply back here for the sake of others.
>\----
>
>
>At 9/23/2014 10:34 AM Tuesday, juan concepcion wrote:
>Hello I need help with sending an alphanumeric 
>marker when presenting a stimulus. I have set 
>the port for communication and already have 
>successfully sent markers to another program.Ã'
>
>My wish now is to send markers if stimuli are 
>correct or incorrect. So for example if stimulus 
>is correct send marker "1" and if stimulus is 
>incorrect send marker "0". I need to understand 
>how Ã' in-line script does this and what to 
>write in the in-line script for it to perform the function specified.
>
>Thank you in advance!!!
>
>Juan

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