URL of experiment: https://pavlovia.org/mkallmayer/onset_timing (minimal working example)
Description of the problem: I am trying to implement a mouse contingent window. There is a problem though, and I haven’t been able to nail it down yet. In some trials, the aperture (which is implemented as an ImageStim) briefly flashes at the position where the mouse cursor was when the previous trial ended. Here’s a clip that demonstrates this: https://streamable.com/hirsq. This is most likely not related to repetitions of images (this also happens in another task I’ve built that does not have any repetitions).
Is there a way to make stim onsets more reliable through the builder/code components to prevent this brief flashing?