I understand that PsychoPy gives your response data in seconds.
Builder, to obtain your data in milliseconds, just add a
Code component at the begining of your
Routine, and in the
End Routine window insert the following line:
thisExp.addData('StimuliResp.RT in ms', StimuliResp.rt * 1000)
where “StimuliResp” is the name for your object to respond to the stimuli (e.g., keyboard; the “in ms” note is useful to distinguish this variable in your data sheet).
Good luck with your experiment!