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Both external feedback (eg auditory) and internal reward signal (eg introduction of an easy task) can facilitate perceptual learning, providing evidence for supervised and Hebbian learning rules in PL. Characteristics of these two learning mechanisms remained unanswered. In the current study, we trained six groups of subjects to learn a 4-Alternative forced-choice (4-AFC) grating orientation discrimination task that differed in types of feedback (no, auditory, and full feedback) and performance accuracy (two staircases converge to 35% correct, one staircase converges to 35% and the other 70%) to examine the learning benefits from feedback and high accuracy. While auditory feedback just indicated the correctness of each response, full feedback included a tone to indicate correct response and a re-displayed grating of correct orientation, which provided complete information. The results showed that: 1) Thresholds …