Accession Number : AD0673664

Title :   THE SPIRAL AFTEREFFECT: INFLUENCE OF STIMULUS SIZE AND VIEWING DISTANCE ON THE DURATION OF ILLUSORY MOTION,

Corporate Author : CIVIL AEROMEDICAL INST OKLAHOMA CITY OKLA

Personal Author(s) : Collins,William E. ; Schroeder,David J.

Report Date : MAY 1968

Pagination or Media Count : 9

Abstract : The study examined some effects of stimulus size and distance on the persistence of one type of illusory motion, viz., the spiral aftereffect (SAE). Duration of SAE was investigated with stimuli of 2, 4, 8, 12, and 16 inches in diameter. The distance between the observers and the rotating spirals was varied to produce visual angles between 1 deg. 12 min. and 18 deg. 56 min. of arc. Data indicate that the duration of illusory motion reaches peak values between approximately 2 deg. -4 deg. of visual angle. (Author)

Descriptors :   (*ILLUSIONS, VISION), AFTERIMAGES, MOTION, STIMULATION(PHYSIOLOGY), AVIATION MEDICINE

Subject Categories : Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE