Glad it helped! I just use maxTrials to terminate and then use all the data collected (stimulus intensity and accuracy) to reconstruct a QuestHandler object and then use the internal posterior probability density function and the built-in mean() method to calculate an estimate of the threshold.
I got interested in your question though, but couldn’t find a clear answer, which is reflected in this discussion I found from some time ago:
Correct use of StopInterval in QuestHandler - Coding - PsychoPy
Good luck!
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