Count the milliseconds until the user presses a button?

[Josh]

Hi all

I want to count the milliseconds until a button is pressed. How can this be done?

Thanks a lot for hints
Josh

[Jeff]

You may want to look into Cedrus response pads. Vizard supports them and they are designed for that kind of accuracy.

[JimC]

Does Vizard have any particular tricks for handling rendering latency when measuring RTs? I've generally smacked a photocell on the screen to trigger the RT measurement interval...