Accession Number : ADA187668

Title :   Spatiotemporal Characteristics of Visual Localization. Phase 2.

Descriptive Note : Annual rept. Oct 86-Oct 87,

Corporate Author : SRI INTERNATIONAL MENLO PARK CA SENSORY SCIENCES RESEARCH LAB

Personal Author(s) : Burbeck, Christina A

PDF Url : ADA187668

Report Date : 30 Sep 1987

Pagination or Media Count : 126

Abstract : The spatial and temporal characteristics of human visual localization are studied using psychophysical techniques. The primary tasks studied are frequency discrimination and distance judgments in the plane perpendicular o the observer's line of sight. It is found that these tasks cannot be performed directly on the basis of simple transformations of the retinal image, but depend on stimulus context and on judgment of stimulus depth. Experiments are designed to isolate the process underlying these distance and size judgments from more distal visual processes. One prominent finding is that the localization process is remarkably insensitive to those aspects of the stimulus that most affect contrast detection thresholds. Keywords: Human vision; Visual psychophysics; Visual spatial localization.

Descriptors :   *DISCRIMINATION, *VISION, *VISUAL PERCEPTION, CONTRAST, DEPTH, DETECTION, FREQUENCY, HUMANS, IMAGES, JUDGEMENT(PSYCHOLOGY), LINE OF SIGHT, OBSERVERS, PSYCHOPHYSICS, RETINA, STIMULI, THRESHOLD EFFECTS, TRANSFORMATIONS, MOVING TARGETS, LINE OF SIGHT

Subject Categories : Anatomy and Physiology
      Psychology

Distribution Statement : APPROVED FOR PUBLIC RELEASE