dear psychopy I would like to let you know that 2024 version of psychopy has a keyboard handling bug which causes misses of the “press” keyboard events. Have to actually press a button for 10-20 times before it gets detected. the 2022 version does not have this problem. Best wishes LF

Do you have a keyboard component AND event.getKeys() in code?

in the “time line” editor, I add two “trial” blocks the first one has a text “hello” shown for 10s and a keyboard which waits for a button press. the second one has a text “bye” for 3s. the idea is as soon as a button is pressed, the slide advances… in 2022 version, the task works correctly and …

This sounds like the non-slip timing error. Try setting the max duration in Routine Settings. I’ll link to a relevant post later if you haven’t sorted it out.

Please, elaborate, I am not sure what “non-slip timing error” is.

[image] Routine doesn't advance after mouse/slider response, forced end of routine enabled, duration fixed Online experiments There is an issue with “non-slip” timing. I find that the best way to deal with it is for components to have no duration (i.e. blank) a…

I would like to thank you for the link. it is very educational and some of the “artefacts” described there (like black screen) I have also observed. The practical recommendation to leave each component duration blank and use “routine settings” → flow-> duration (if I understood correctly) to set on…

I don’t think your keyboard event is missing. I think that it is ending the routine (screen goes black) but failing to move on to the next routine (because the routine is set to a fixed duration). The solution I give here tells PsychoPy not to fix the duration of this routine.

Keyboad events bug

Coding

wakecarter May 2, 2026, 9:41am 6

Topic		Replies	Views
Missing key press inputs with kb.getKeys (around 5% of the trials) Coding	4	943	May 18, 2021
Unrealistic response durations Other	4	407	August 21, 2022
Routine doesn't advance after mouse/slider response, forced end of routine enabled, duration fixed Online experiments timing , screen , pavlovia	3	117	November 5, 2025
Routine skipping issue Online experiments timing , pavlovia	7	145	November 5, 2025
Possible bug: experiments ran online on Pavlovia show only one trial then skip to next routine Online experiments online , pavlovia	2	121	October 9, 2024

Keyboad events bug

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