Accession Number : AD0767322

Title :   Frequency Thresholds for Two Flash Flicker and Critical Flicker: Why They Differ.

Descriptive Note : Progress rept.,

Corporate Author : NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA CREW SYSTEMS DEPT

Personal Author(s) : Herrick,Robert M.

Report Date : 08 JUN 1973

Pagination or Media Count : 22

Abstract : The minimum interval detectable between two successive light flashes is longer than the minimum interval detectable when many flashes are viewed. The probability summation hypothesis is suggested to explain the difference. For a given flash duration, the minimum interval detectable decreases as a function of the number of flashes n, until n equals about 8 or 10; further increases in n cause no further changes in this interval. Of the total decrease in the interval from 2 to 99 flashes, about 90% is explained by the probability summation hypothesis. (Author)

Descriptors :   (*VISUAL PERCEPTION, THRESHOLDS(PHYSIOLOGY)), IMPACT FLASH, FREQUENCY, PERCEPTION

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE