Go/No Go Task Timing and Accuracy Logging

[katherine]

Thank you very much Nick! This seems to be working. I actually tried
using RESP before, but I must have had the code wrong.

Katherine

On Apr 30, 6:52 am, Nick <nick.peatfi... at gmail.com> wrote:
> Hi Katherine,
>
> If I understood correctly this would be my solution:
>
> instead of using ACC you could just use RESP and use this to save
> their accuracy.
>
> Dim CorrectReject as Integer
>
> IF StimSlide2.RESP = "" then
> CorrectReject = 1
> sleep (1300)
> else
> CorrectReject = 0
> End if
>
> c.SetAttrib "CorrectReject", CorrectReject
>
> I use an inline currently on a go/no-go to make the analysis quicker.
> So would also place a variable like EOC into the same script.
>
> Hopefully this will help.
>
> Regards,
>
> Nick
>
> On Apr 29, 6:39 pm, katherine <katherinekoe... at sbcglobal.net> wrote:
>
>
>
> > Hello Everyone,
>
> > I would be very grateful if you could help me with a task I am
> > programming. I am having a problem with a Stop Signal (Go-NoGo) Task.
>
> > This task has two conditions - Go (with two stimuli: < and >) and No
> > Go (Stop Trial) (also with stimuli: < and >). Each trial is timed to a
> > trigger from our scanner, which comes every 2.8 seconds. Each trial
> > lasts for two trigger periods (5.6 seconds). The Go condition is
> > working fine. The subject sees a "ready" crosshair for 500ms, then has
> > 900ms to respond to a stimulus prior to a feedback slide. In the Stop
> > condition the subject sees a "ready" crosshair for 500ms, sees a
> > stimulus, and hears a beep ("sound delay") shortly after the
> > presentation of the stimulus, which cues them to inhibit their
> > response. The timing of the presentation of the beep is dependent upon
> > a staircase. As the accuracy of the subject's responses on the Stop
> > Trials increases the time between the presentation of the stimuli and
> > beep should also increase. As accuracy decreases, the time should also
> > decrease. The goal is to keep the subject's accuracy around 50%. At
> > the beginning of the task the experimenter enters the starting time of
> > the beep presentation, based on the ending time from the subjects
> > practice run (hopefully already close to 50%).
>
> > I am having two problems with the script as it currently stands.
> > First, I am trying to set up the No Go portion (Stop Trial) of the
> > task so that it lasts for two trigger periods. Currently, if a subject
> > mistakenly responds on a No Go trial the "TrialBlankEnd2" display is
> > skipped. "TrialBlankEnd2" is a blank 1200ms display which is used to
> > lengthen the duration of the trial in order to ensure the trial lasts
> > for two trigger periods. If ""  is skipped the next trial starts after
> > only one trigger period.
>
> > I tried to achieve the same effct by using a "sleep" command, using
> > the following code:
>
> > c.SetAttrib "StimSlide2.ACC", StimSlide2.ACC
> > If StimSlide2.ACC = 0 Then
> > sleep (1300)
> > End If
>
> > I tried to insert this code in an inline file after "sound delay," but
> > it seems that when this code is implemented StimSlide2.ACC is always
> > set to zero, instead of set to 1 (which it should be set to when the
> > person correctly inhibits) The result is that the staircases I've set
> > up do not work.
>
> > What I'm looking for is a way to ensure that no matter what the
> > subject's response on a Stop Trial, the next trial does not start
> > until two trigger periods have elasped (5.6sec). If "TrialBlankEnd2"
> > is skipped, the next trial starts after one trigger period (2.8sec).
> > If I use a sleep command, it seems to throw off the accuracy count (on
> > which the staircasing is dependent).
>
> > It seems as though the script is set up correctly for the most part.
> > The staircases do work when the accuracy count works. Is there a
> > better way to set up The Stop trials that will ensure that the trials
> > have "blank time" on the end and that the accuracy counts are
> > accurate?
>
> > Thank you very much for your help with this. I appreciate it.
>
> > Katherine Koenig- Hide quoted text -
>
> - Show quoted text -
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