M-series Mac frame timing issue seems resolved

ipsych · February 23, 2026, 3:21am

Such a good day for mac-using experimenters.
Thanks to bugfix in BF: Fix `waitBlanking=True` on MacOS by mdcutone · Pull Request #7502 · psychopy/psychopy · GitHub , PsychoPy 2026.1.0 seem to resolved the timing issue.
Tested in Mac Book Pro 2023, Sequia 15.7.3, and attach both promotion On and Off result. I will update with M1 and M4 mac mini results soon.

Below testing code (seems not included in 2026.1.0) works out of box.

github.com/psychopy/psychopy

psychopy/demos/coder/timing/timeByFrames.py

15051871e


      
          #!/usr/bin/env python
          # -*- coding: utf-8 -*-
          
          """
          The most accurate way to time your stimulus presentation is to
          present for a certain number of frames. For that to work you need
          your window flips to synchronize to the monitor and not to drop
          any frames. This script examines the precision of your frame flips.
          
          Shut down as many applications as possible, especially those that
          might try to update
          """
          
          from psychopy import visual, logging, core, event

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M-series Mac frame timing issue seems resolved

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