Refresh rate issues
Hello,
I'm running a random dot motion experiment (from psychopy.visual import DotStim). The experiment is played correct visually when it is displayed over a monitor set to 29Hz refresh rate. When playing the experiment on different monitors (and computers) that are set to 60Hz refresh rate, the dot stimuli appears different. I did a little reading about the DotStim arguments and it seems that they are computed based on the monitor's refresh rate, hence, I'm assuming this is the reason behind the visual difference. Is there a way to control the refresh rate through my code? To be clear, assuming that is the issue, I need to set a 60Hz refresh rate monitor to 29Hz refresh rate. If there is a more simple way to make the experiment appear the same on different monitors that would work just as well.
These are the parameters that were displaying the experiment correctly on the 29Hz monitor (OpenSesame v3.1.9). Let me know if more information is needed.
BTW - I'm using the same version of OpenSesame (3.1.9) on the different machines. Wouldn't mind upgrading, just need to make sure the experiment is displayed correctly and the same as before.
Thanks,
Omer
Comments
Hi Omer,
As you use psychopy directly, this question is more appropriate to ask on the psychopy forum: https://discourse.psychopy.org/
I don't know how exactly this works, but if dotstim really access the refresh rate directly to decide when to update the screen, you would probably need to somehow access the source code of the dot stim, and hardcode the refresh rate to 29 Hz (if you know for sure that this is the refresh that you need). Whether this is possible, I don't know, though.
Eduard