Script for redoing a trial up to 16 times or untill response

[David McFarlane]

Julia,

>(1) Measuring RT from the first display.
>
>As I as previously explained, I present a visual array of stimuli 
>followed by a blank screen upto 16 times or until response 
>(stimArray+Blank, stimArray+Blank, and so on). The RT measure I get 
>is just from the last stimArray+Blank ( the one you respond to, 
>instead of being from the first one). I would like to have a measure 
>of the RT from the first display until response (whether is one or 
>16 displays). Is there a way to do this?

There are several ways to do this.  Here is one, for example.  You 
will have to add some script to the start and end of your 
PresentationList, so the structure might now look like this:

RTStartScript
PresentationList
     PresentationProc
         StimArray
         BlankScreen
         TrialFinishScript
RTFinishScript

RTStartScript contains script like this:
Dim TrialT0 as Long
TrialT0 = Clock.Read

RTFinishScript contains script like this:
StimArray.RT = StimArray.RTTime - TrialT0

This assumes that you want to allow a response only during the 
presentation of each StimArray.  If you want to allow a response any 
time during the PresentationList loop, there are other techniques, 
which I could explain if asked.

Once again, for more information you can look at the Clock Object and 
InputMask Object topics in the online E-Basic help.


I do not have an answer for your second request, I will leave that to 
others more talented than me.

-- David McFarlane, Professional Faultfinder


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