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QuestHandler "capping" values inappropriately?


I am using Questhandler with the following parameters:

(.1, 2, pThreshold=0.82, extraInfo=thisStart,gamma=0.5, nTrials=128, minVal=0, maxVal=1, stepType=‘log’, grain=0.01, range=1)

Although this originally appeared to provide reasonable values for thresholds (i.e., values greater than 0 and less than 1), I noticed that the threshold values for participants who did poorly actually appeared to be “capped” just below .32, regardless of the number of incorrect responses. In other words, the actual range appears to be above 0 and below .32, rather than above 0 and less than 1.

Has anyone encountered this, and/or does anyone know why this might be occurring?