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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.<br>
<br>
Leisha Wharfield<br>
Decision Research<br>
Eugene, Oregon USA<br>
<br>
David Hairston wrote:<br>
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<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">I need to send a trigger
signal denoting the exact time of
stimulus presentation (assuming parallel port is the easiest method).<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">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?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Or – is there a way to do
it with a Slide object?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Unfortunately, this will
be very difficult to test out
empirically…<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">W. David Hairston, Ph.D.</span></font><o:p></o:p></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">ANSIR Lab</span></font><o:p></o:p></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
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<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">(336) 716-7160 (Offiice)</span></font><o:p></o:p></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">(446) 716 0798 (Fax)</span></font><o:p></o:p></p>
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