Abstract
Performances in the following auditory intensity discrimination paradigms were compared: (1) 2IFC; (2)single-interval rating with an intensity cue preceding each observation interval; (3) single-interval rating with no cue. ROC curves obtained in the single-interval tasks can be well fitted by assuming that the underlying distributions are both Gaussian and have equal variance. No large difference was observed between performance in the cue and the no-cue conditions. The normalized separation of the means of the decision variable for 2IFC was approximately twice the corresponding estimate for the single-interval conditions, i.e., d2 = 1.91d1. This is consistent with the hypothesis that the observer bases his decisions on the difference between the observed input and a noisy stored reference in certain intensity discrimination tasks. This hypothesis can be incorporated easily into most models of intensity discrimination and can account for the familiar result that d2 = √d1 for simple detection. [Supported by an NIH Predoctoral Fellowship and by the Information Sciences Directorate, Air Force Office of Scientific Research.]
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