online trigger of keybaord responses

[David Hairston]

I would like to get an externally triggered record of a keyboard press
for use with an MEG system.

Is there a way to get a time-locked onset signal or "trigger" of a
keyboard/mouse response at the time it is made, similar to the
.OnsetSignalEnabled property for runnable objects, even if the current
object is still executing?

Ideally I'd like to have access to the accuracy of said response,
evaluate it and send an external digital signal signifying this... but
just getting a signal out at all would be workable.

 

I know it can be done easily AFTER the target object has occurred, for
example something like "if rresponse.ACC = 1 then WritePort &378, 1".

However, this is only (relatively) time-locked w/ the response in the
case where the response terminates the object; in the case of a
fixed-duration with recorded response, the evaluation/trigger would not
occur until afterwards, and hence somewhat later than the actual
response time.

 

Does anybody have some insight on a trick to get this?

Thanks

 

 

 

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)

(336) 716 0798 (Fax)

 

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