Design that loops a visual discrimination task while waiting for keyboard input?

[David McFarlane]

First, you may use inline code to take complete 
control of List termination, see the 
List.Terminate topic in the E-Basic Help 
facility.  You will need to combine that with some appropriate If-Then logic.

If you want to combine that with some secret 
keypress from the researcher, then I would 
recommend starting a Wait object at the start of 
primary task.  Set its Duration to 0 and add an 
input mask for your secret handshake, set 
Allowable to the secret key and Time Limit to 
"(infinite)" (in my online course we do an 
exercise that illustrates exactly this).  Let's 
call this object PrimaryWait, and suppose the 
List for your secondary task is 
SecondaryList.  Then in inline code in the 
appropriate Procedure, do something like

     If PrimaryWait.RTTime Then SecondaryList.Terminate

(also see 
https://groups.google.com/d/topic/e-prime/T5ThFkW8qF8 
for other ways to test for presence or absence of response).

Note that this will terminate the List upon 
completion of all the objects in the 
Procedure.  If needed, you might use a Goto to 
skip to the end of the running Procedure, or use 
techniques from 
https://groups.google.com/d/topic/e-prime/e12W9DdgvrM 
to Terminate with a set overall duration.

Good luck.

-----
David McFarlane
E-Prime training 
online:  http://psychology.msu.edu/Workshops_Courses/eprime.aspx
Twitter:  @EPrimeMaster (https://twitter.com/EPrimeMaster )


At 11/21/2013 03:59 PM Thursday, Colton Perry wrote:
>After playing around with a lot of it now, I 
>think I can distill everything down to one 
>question. Sorry for the confusion. I'm sure most 
>of what I've got isn't the most elegant 
>solution, but it will hopefully run the study in 
>a fashion I can put together without too much extra help.
>
>The one thing I'm not sure how to do is this: 
>How can I get a list to exit on keypress? The 
>"Exit List" options are for after a certain 
>amount of cycles or samples or seconds. I would 
>just like the exit cue to be a simple keypress 
>that the researcher could make when the 
>participant completes the primary task. With the 
>timestamps you mentioned, that would give us the 
>timing we need for that component, and the 
>monitoring task will be handled within each list.
>
>Sorry my thoughts are somewhat jumbled.
>
>On Thursday, November 21, 2013 2:39:46 PM UTC-6, McFarlane, David wrote:
>Yes, I am having trouble following you, don't
>know if that's me or you, but I have trouble
>following wordy expressions, perhaps if you could
>find some way to reduce, simplify, & clarify your expression...
>
>As far as I can tell, what you want is trivial to
>accomplish.  You should already have your visual
>monitoring "secondary" task log all the relevant
>data, so you are all set there.  For the
>"primary" task, if you simply log a timestamp for
>the first relevant event, and a timestamp for the
>last relevant event, then you may simply subtract
>to get the total elapsed time -- you may do that
>from the data after the run, or with some
>cleverness use inline code to compute and log 
>this directly to the .edat file.
>
>What am I missing?
>
>-- David McFarlane
>
>
>At 11/21/2013 02:53 PM Thursday, Colton Perry wrote:
> >That's a component of what I'm trying to do, but
> >I think the main thing I'd like to accomplish is
> >to be able to record both the RTs and accuracy
> >to responses for the monitoring task while also
> >recording the total time that the trial took
> >place. Maybe I'm thinking about it the wrong
> >way. It seems like it wouldn't be difficult to
> >have a procedure that does one or the other, but
> >I don't know how to get it to do both
> >concurrently. It's important that all of the
> >monitoring responses be tied to each particular
> >text instruction because our goal is to measure
> >the differences in accuracy and RT for the
> >monitoring task as a result of the different primary tasks.
> >
> >I feel like I'm not being particularly clear,
> >and I apologize for that. We have two tasks that
> >we would like to be recorded. One is performance
> >on the monitoring task, and one is total time
> >for completion of the primary task. So a single
> >"trial" is the onset of the text instructions to
> >the keypress that terminates that set of
> >instructions, and within that trial the visual
> >monitoring task loops until the trial is over.
> >I'm not sure how to get do the two things concurrently.
> >
> >Am I making this more complicated than it really is?
> >
> >On Thursday, November 21, 2013 1:28:56 PM UTC-6, McFarlane, David wrote:
> >Do I understand correctly that your sticking
> >point is only how to keep some constant text on
> >the display throughout a series of stimuli &
> >responses?  If that's all, I have two solutions:
> >
> >1) The rookie way:  Add the constant text to all
> >of the stimulus displays -- either add the full
> >literal text into each display, or put the text
> >into an attribute and then use the same atribute
> >reference in each display.  You would most easily
> >do this using Slides for your display objects.
> >
> >2) My preferred way:  With judicious use of Frame
> >Size and Position, and BackStyle Transparent, you
> >may add the constant text to a place on the
> >screen that just never gets covered up by subsequent stimuli.
> >
> >Good luck.
> >
> >-----
> >David McFarlane
> >E-Prime training
> >online:
> ><<http://www.google.com/url?q=http%3A%2F%2Fpsyc 
> hology.msu.edu%2FWorkshops_Courses%2Feprime.aspx&sa=D&sntz=1&usg=AFQjCNHhJVD3mCfXKdywfB5AgKLPu1OSJg>http://www.google.com/url?q=http%3A%2F%2Fpsychology.msu.edu%2FWorkshops_Courses%2Feprime.aspx&sa=D&sntz=1&usg=AFQjCNHhJVD3mCfXKdywfB5AgKLPu1OSJg>http://psychology.msu.edu/Workshops_Courses/eprime.aspx 
>
> >
> >Twitter:  @EPrimeMaster
> >(<<https://www.google.com/url?q=https%3A%2F%2Ft 
> witter.com%2FEPrimeMaster&sa=D&sntz=1&usg=AFQjCNHlT7nwYBmELwRxV4Xn5GW-sG9EKw>https://www.google.com/url?q=https%3A%2F%2Ftwitter.com%2FEPrimeMaster&sa=D&sntz=1&usg=AFQjCNHlT7nwYBmELwRxV4Xn5GW-sG9EKw>https://twitter.com/EPrimeMaster 
>
> >)
> >
> >/----
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> >PST's trained staff take any and all questions at
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>
> >, and they strive to
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> >channel
> >(<<http://www.youtube.com/user/PSTNET>http://ww 
> w.youtube.com/user/PSTNET>http://www.youtube.com/user/PSTNET
> >).  4) 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 11/21/2013 02:10 PM Thursday, Colton Perry wrote:
> > >Hi all, I hope this isn't something I could have
> > >easily figured out by a good Google search, I
> > >just haven't been able to find the correct
> > >search terms to get what I'm going for here.
> > >
> > >I'm trying to implement a design that's a bit
> > >beyond my understanding (most of my experience
> > >with e-prime has been mostly pretty
> > >straight-forward linear presentation stuff). To
> > >boil it down to a single trial, I'd like to
> > >present a simple visual search/discrimination
> > >task alongside a set of verbal instructions. So
> > >for example, at the onset of a trial, a text
> > >display would appear providing instructions for
> > >a primary task to be performed outside of
> > >e-prime (these tasks are performed on a
> > >motorcycle infotainment system). A short time
> > >after the onset of those instructions, the
> > >visual discrimination task would begin. So,
> > >leaving the instructions on the display, a
> > >letter would appear. If this is a key letter,
> > >the participant would respond with a key press
> > >(well, a foot pedal mapped to a key press "b",
> > >but a key press to Eprime). If it's not a key
> > >letter, then the participant does nothing and
> > >the letter disappears. The part I'm not sure how
> > >to accomplish is that after they respond with a
> > >key press, I need the discrimination task to
> > >repeat itself on average every 5 seconds (so 5 ±
> > >2s) while the text display with the instructions
> > >remains the same. After the participant
> > >completes the primary task on the motorcycle, a
> > >researcher would then press a key to end the
> > >trial and move on to the next set of instructions.
> > >
> > >So it would look something like this:
> > >
> > >Primary task instruction onset
> > >--- key letter appears > foot pedal response >
> > >key letter disappears, record RT
> > >--- foil letter appears > no response > foil
> > >letter disappears after a given time, record response if incorrect
> > >--- repeat randomly
> > >--- Primary task completed > research 
> presses key > record total trial time
> > >Primary task instruction onset
> > >etc.
> > >
> > >Does this make sense? Please let me know if I
> > >need to provide more information. I'll keep
> > >trying different things in the meantime. Most of
> > >my experience with Eprime has been in the gui
> > >interface rather than the inline commands, so
> > >I'm pretty inexperienced on that end, but 
> I'm definitely willing to learn.
> > >
> > >Thanks in advance for your time,

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