You certainly could try using the InputRT program that comes with DirectRT. I would run it in combination with DirectRT but you could also run it with MediaLab. In any case, InputRT is here (see link below) and you can get a code for it if you are a licensed v2006 DirectRT user:
www.empirisoft.com/support/showthread.php?t=330
One way to do it: You would start InputRT before the DirectRT session. You could present an instruction screen instructing the subject to click the left mouse button to start the movie. InputRT will record that click and will consequently give you a reference point in the InputRT data file so you'll know at what point the movie started.
Hope that makes sense. Let me know how it works out if you try this!
-Blair




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