Form Perception and Related Issues in Blind Humans

Experimental research with the blind is relatively scarce. While philosophers and psychologists have often speculated on the nature of the world of the congenitally blind, few systematic studies are based upon a coherent theoretic framework. Furthermore, it is often difficult to compare one study with another, due to the heterogeneity of the population samples studied. Blindness is a rare disorder in our geographic area. Consequently, the available subjects may vary in their chronological age, age at onset of blindness, duration of blindness, etiology, intellectual and socioeconomic status, education, etc. Even the degree of residual vision is variable, since “legal blindness” permits a level of visual functioning that allows some form perception (1/10th or 1/20th).

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