Sending triggers (again): how to best invoke them for a response in an oddball paradigm?

[Ben Robinson]

one way you could do this would be to basically have two objects in your procedure:
the slide object and an inline
set your slide duration to 1 ms, with a response duration of 2000 ms.
put your inline immediately after the slide.

your inline could  read something like this:
Dim cnvs as Canvas
Set cnvs = Display.Canvas

Do
  If Slide1.RT > 0 Then
    WritePort...
  End If
Loop While (Clock.Read - Slide1.OnsetTime) < (999 - Display.RefreshDurationStats.Mean)

cnvs.Clear

Do
  If Slide1.RT > 0 Then
    WritePort...
  End If
Loop While (Clock.Read - Slide1.OnsetTime) < (1999 - Display.RefreshDurationStats.Mean)

something like that might work.

>>> "J Scott Saults" <saultsj at missouri.edu> 10/28/2006 12:39 PM >>>
Sorry, but in spite of detailed explanation by Brandon Cernicky and some
study and experimenting with the ProcessResponsesTemplate.es, I STILL do not
have a good solution for sending triggers in a particular variation of an
Oddball paradigm with repeated stimuli. In this experiment, each stimulus (a
picture) is presented for 1 s, followed by a 1 s ISI with a blank screen,
and a single response, made during the stimulus presentation or the
following ISI, is collected for each stimulus. I want to send a
response-dependent code to the parallel port at the time of the response. I
want the timings to remain constant, 1 s stimulus display, 1 s ISI,
regardless of when the response occurs.

The ProcessResponsesTemplate.es seems designed for situations when the input
mask is set to collect multiple responses, since the code within the
IsPending loop never executes for a single, or the last, response. Of
course, I could invoke a writePort after the IsPending loop for a single
response. However, I cannot figure out where to put an inline, with a
writePort, without interrupting or changing display durations, when I want
the response interval to include the 1 s stimulus presentation and the
following 1 s ISI. At first, I thought I could put the inline after the ISI,
if I set the prerelease of the ISI and the prerelease of the stimulus equal
to their respective durations, but this doesn't seem to work.

Thanks, in advance, for any suggestions, from Brandon or anyone else.

Best regards,
J Scott Saults