Accession Number : AD0722407

Title :   The Relative Importance of Contrast and Motion in Visual Target Detection,

Corporate Author : RAND CORP SANTA MONICA CALIF

Personal Author(s) : Petersen,H. E. ; Dugas,D. J.

Report Date : MAR 1971

Pagination or Media Count : 37

Abstract : Results of a previous study (see AD-720 800) suggested that the effect of motion on detecability might be caused entirely by contrast changes as the target moves over a complex background. The test documented in the present study, employing a television display and an artificial background, showed independent effects of both contrast and motion on target detectability. The effects can be accounted for by modifying the exponent in the detection probability function with a linear contrast term and a second-power velocity term. Single-fixation experiments confirmed a larger aperture for moving targets than for static targets, and also demonstrated a gradual increase in the fixation time required to detect a target as a function of its distance from the fixation point. (Author)

Descriptors :   (*TARGET DISCRIMINATION, PERFORMANCE(HUMAN)), (*VISUAL PERCEPTION, MATHEMATICAL ANALYSIS), PATTERN RECOGNITION, MOTION, BACKGROUND, VISUAL ACUITY, TIME, TELEVISION DISPLAY SYSTEMS

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE