Accession Number : ADA118970

Title :   Depth Constancy in Stereoscopic Afterimages: Effects of Viewing Distance and Measurement Method.

Descriptive Note : Technical rept.,


Personal Author(s) : Cormack,Robert H

PDF Url : ADA118970

Report Date : Aug 1982

Pagination or Media Count : 35

Abstract : Stereoscopic depth constancy refers to the proposition that perceived depth signaled by retinal disparity remains constant despite changes in viewing distance. There has been some controversy as to whether stereoscopic depth constancy can operate at distance greater than a few meters. A previous study used a stereoscopic afterimage technique to determine whether depth constancy holds as fixation distance varies. After obtaining an afterimage containing depth information in the form of retinal disparity, observers set a depth probe equal in apparent distance to the disparate afterimage. The results showed that depth constancy persisted up to 27 meters. The present study was conducted to address two issues raised by the previous work. First, it is important to establish that stereoscopic depth constancy can be confirmed by measures which do not themselves depend on retinal disparity as the depth probe method does. Second, it is only beyond 27 meters of viewing distance that there are large departures in the predictions made by different models of depth constancy.

Descriptors :   *Depth, *Visual perception, Afterimages, Range(Distance), Measurement, Retina, Viewers, Observers

Subject Categories : Psychology

Distribution Statement : APPROVED FOR PUBLIC RELEASE