Processing Speed in SSD task

[ben robinson]

rather than

...
If SSDArrowLeft.RT > 0 Then
stopduration = 0
c.SetAttrib "stopduration", stopduration
...

try instead

...
If SSDArrowLeft.RT > 0 Then
Goto Label1
...

and put a Label object (Label1) on your procedure timeline immediately
following the stop signal slide.  this will cause the script to skip your
stop signal slide if an appropriate response is made.

you're seeing the stop signal flicker on the screen, despite a duration of 0
milliseconds, because the code is still requesting that the stop signal be
drawn to the screen.  the fact that the duration is 0 just means that it
won't remain on screen following the first screen refresh after it's first
drawn.

hope that helps.

ben

On Fri, Dec 5, 2008 at 3:51 PM, Zach <zachary.d.cohen at gmail.com> wrote:

>
> Hello everyone,
>       I have a stop signal delay task in which I used the following
> line of code to set the duration of my slides:
>
> dim duration as long
> dim stopduration as long
>
> If SSDArrowLeft.RT > 0 Then
> stopduration = 0
> c.SetAttrib "stopduration", stopduration
> duration = 1000 - SSDArrowLeft.RT
> c.SetAttrib "duration", duration
>
> Else
> dim SSDtimeleft as long
> SSDtimeleft = CLng(c.GetAttrib("SSDtimeleft"))
> stopduration = 1000 - SSDtimeleft
> c.SetAttrib "stopduration", stopduration
>
> End If
>
> This code follows a slide called SSDArrowLeft which has a duration of
> either 100, 150, 200, or 250ms, and terminates upon response. If the
> user doesn't respond, a stopsignal slide is presented. If they manage
> to respond during this time, the goal is to skip this stopsignal slide
> by setting its duration to 0. I believe this should work and has
> worked in the past, but for some reason when this program is run and a
> response is made during the SSDArrowLeft slide I see a flicker of the
> stopsignal slide. Could this be the computer or program is simply slow
> and presents the stopsignal slide for a few miliseconds while it
> proccesses, or is there something wrong with my code structure? I fear
> the latter, but hope more experienced users like yourselves might have
> run into this problem before and might have a solution.
>
> I greatly appreciate your time and advice, and have relied heavily on
> this forum and past postings to educate myself about eprime.
>
> Sincere thanks,
> -Zachary Cohen
> >
>

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