Accession Number : AD0767647

Title :   Probability of Detecting Two Dim Visual Signals as a Function of Their Temporal Separation.

Descriptive Note : Progress rept.,

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

Personal Author(s) : Herrick,Robert M.

Report Date : 19 JUL 1973

Pagination or Media Count : 22

Abstract : Dim visual signals presented on visual display devices or in the natural environment may be undetected, or may be detected only occasionally. The problem considered is how often two dim flashes are detected and how does the frequency of detection vary with the interval separating the two flashes. Four empirical laws, collectively termed the TEpee effect, were recently suggested to describe the interaction of two flashes in determining the light detection threshold as a function of the interval between the flashes. Based on the TEpee effect, with two constant-duration-luminance, constant flashes, predictions were derived on the probability of detection. (Modified author abstract)

Descriptors :   (*VISUAL SIGNALS, *DETECTION), (*VISUAL ACUITY, *THRESHOLDS(PHYSIOLOGY)), PERFORMANCE(HUMAN), THEORY, FREQUENCY, FLASH LAMPS, LOW LIGHT LEVELS, MATHEMATICAL PREDICTION, PROBABILITY

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE