Frames in Psycho Py

If this template helps then use it. If not then just delete and start from scratch.

OS (e.g. Win10):
PsychoPy version (e.g. 1.84.x):
Standard Standalone? (y/n) If not then what?:
What are you trying to achieve?:
I want to understand what an actual frame is in PsychoPy. Is a frame each stimuli that is presented? How can I record the amount of time that each stimuli is presented on the screen
What did you try to make it work?:

What specifically went wrong when you tried that?:
Include pasted full error message if possible. “That didn’t work” is not enough information.