synchronized trigger and stim presentation

[Leisha Wharfield]

Doesn't standard data logging give you the precise timing of stimulus 
presentation already, with its many time measurements? You can use 
PreRelease to minimize OnsetDelay, and you can also set a 
CustomOnset/OffsetTime. It's all in the Critical Timing chapter.

Leisha Wharfield
Decision Research
Eugene, Oregon USA

David Hairston wrote:

> I need to send a trigger signal denoting the exact time of stimulus 
> presentation (assuming parallel port is the easiest method).
>
> Here is the problem/question - in the event of, say, a visual 
> stimulus, what is the best way to get these as close in sync as 
> possible? I could have an inline code sending the trigger directly 
> prior to an ImageDisplay... but then it wouldn't it at least have the 
> delay associated with waiting for the next screen update (could be up 
> to 9ms if 100hz monitor)?. Or - what about putting the inline right 
> after said presentation - would it actually occur immediately (like 
> w/in a few ms) afterwards?
>
> Or - is there a way to do it with a Slide object?
>
> Unfortunately, this will be very difficult to test out empirically...
>
>  
>
> W. David Hairston, Ph.D.
>
> ANSIR Lab
>
> Dept of Radiology
>
> Wake Forest University School of Medicine
>
> Medical Center Blvd
>
> Winston-Salem NC 27157
>
> (336) 716-7160 (Offiice)
>
> (446) 716 0798 (Fax)
>
>  
>
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