Accession Number : AD0662005

Title :   CONTOUR DESCRIPTOR PROPERTIES OF VISUAL SHAPE.

Descriptive Note : Final rept. 1 Feb 66-31 Jan 67,

Corporate Author : SPERRY RAND RESEARCH CENTER SUDBURY MASS

Personal Author(s) : Kaufman,L. ; Hochberg,J. ; Richards,W. ; Pitblado,C. B.

Report Date : SEP 1967

Pagination or Media Count : 90

Abstract : The results of a one year program to elucidate the problems underlying shape perception are presented. Following a review of the field, extensive studies of spontaneous fixation tendencies in visual forms are reported. These studies indicate that visual shape is a stimulus to fixation, suggesting that the peripheral inputs, per se, are not the primary determiners of spontaneous fixation tendencies, but that the already organized cortical representation of shape is such a factor. Experiments will flow patterns in visual noise suggest that the visual system does behave as if it has field or global properties. Finally, studies of illusions indicate that a second class of visual illusions can be designated on the basis of dependency on converging lines or line segments as the inducing feature. Illusions in this inclination-dependent class are all such that if the illusion inducing lines are rotated so they are parallel or normal to the test lines the illusion is eliminated. This classification permits a number of apparently different illusions, including the Hering, Zollner, and Ponzo illusions, to be considered related. (Author)

Descriptors :   (*VISUAL PERCEPTION, GEOMETRIC FORMS), SPACE PERCEPTION, ILLUSIONS, STIMULATION(PHYSIOLOGY), VISION

Subject Categories : Psychology

Distribution Statement : APPROVED FOR PUBLIC RELEASE