Examination of Gibson's Psychophysical Hypothesis.

The experimental evidence regarding Gibson's psychophysical hypothesis is examined. The presentation is divided into 2 sections dealing with static and transforming stimulation, respectively. Under the former heading the stimulation for surface, slant, and depth is considered. Under the latter heading the investigations of motion perspective, continuous perspective transformations, and size-transformations are examined. 2 general conclusions emerged from this examination: the psychophysical hypothesis has not been unequivocally confirmed and Gibson's theory requires revision to make explicit several recurrent implicit premises.