Divide reaction time in a phase where no reactions /where reactions are registered?

[jarvis24]

OK, I think I'm almost with you here. Let's use a concrete example.

Our proband sees video1 for 1000ms, there is 1000ms delay (blank screen) and then video2 appears for 1000ms again followed by 1000ms of delay (blank screen). Suppose our proband ought to press the space bar to react when they see a type of target in any of the videos. Both videos are displayed within a single trial. Is this a kind of scenario this issue could apply to? E.g., the proband sees the target in video1 but responds 2300ms after onset of video1. And SO, it appears that no response to video1 occurred and that the response to video2 was 300ms. Am I in the parking lot of the ballpark here?

And if I am then we need a way to identify this occurrence in the data--yes?

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PS., I have to admit I thought proband (above) was a typo but I checked first and have been educated! From Wikipedia:

Proband, or propositus, is a term used most often in medical genetics and other medical fields to denote a particular subject (person or animal) being studied or reported on...

for curious users, see more at http://en.wikipedia.org/wiki/Proband