How can I get the duration time of a key press with Psychtoolbox?

I am designing an experiment where subjects have to respond continously at two stimuli which will be presented alternately. They will be respond with two key presses: e.g. "a" for stimulus 1 and "b" for stimulus 2.

I need to know which key is pressed and for how long each key is hold down during each trial.

For the former I can use KbCheck but I don't know how to obtain the latter information.

Can anyone help me, please?

Best.

Answer 1

[Arjun]

Hi @Enrica Gaetano,

I see that you want to get the time duration for which a key was pressed.

You can refer to the following MATLAB Answers inorder to explore some ways in which it can be done:

• https://www.mathworks.com/matlabcentral/answers/362688-calculate-and-print-the-duration-of-keypress
• https://www.mathworks.com/matlabcentral/answers/318995-how-to-get-the-duration-of-a-pressed-key-in-matlab

I hope this helps!