Adjusting sampling rate of continuously rated data

Builder
1

PsychoPy version (e.g. 1.84.x):

I have made an experiment in PsychoPy builder to continuously collect urge to move data when listening to a track. Is it possible to adjust the sampling rate/how many times per second data is collected (Ex. making it 4 Hz/per second)?

2

Hi @Ksab22, it’s not as straightforward as just lowering the sampling frequency. But you can start a timer in the beginning of the routine, continuously check whether it has passed .25 seconds and if so, take a sample and reset the timer. This would work like this:

Begin routine

rating = []
timestamp = []

timer = core.Clock()

Each frame

if timer.getTime() >= .25:
    rating.append(slider.getMarkerPos())
    timestamp.append(t)
    timer.reset()
3

Hi @ajus, Thanks so much for the reply. Do I need to put anything in the brackets of the code? Because when I look at the data after running the experiment in Pavlovia it seems to be sampling the same as before adding the code. Is there anything I can provide to help with understanding the issue? It also doesn’t seem to be showing all the data

4

Nothing is needed in the brackets.

Have you added any code to save the data?

In End Routine

thisExp.addData('ratings',rating)
thisExp.addData('timestamps',timestamp)
5

Thanks so much for your help. I added the end code