[BUG]: Trial duration changes across OS and/or if using a second screen or not

[marcobarilari]

Is there an existing issue for this?

• I have searched the existing issues

Expected Behavior

If I inputs

% Speed in visual angles / second
cfg.dot.speed = 15;

cfg.timing.eventDuration = 0.30; % second

I expect the same behavior in both OS.

At least in Liege machine and on Marco's Mac this is not the case. In order to have a trial of .6 seconds in xxx (check in which machine) it needs to input .03 cause it is calculated as slower trial.

Current Behavior

No response

Error message

No response

Environment

- OS:
- Matlab:
- SPM:

Anything else?

No response

[marcobarilari]

Ok this seems to be a universal problem not just with dots, also @yyang1234 and @avanaudenhaege need (sometimes?) to double or divide by 2 the stim duration across OS and/or while using a second screen or not.

@remi, could it be the refresh rate of different screens?

[Remi-Gau]

yeah I saw that issue with @avanaudenhaege as well.

no idea what is going on here because clearly the refresh rate we get from PTB seems correct.