Accession Number : AD0778608

Title :   A Critical Review of the Literature on the Detection of Two Near-Threshold Visual Signals.

Descriptive Note : Progress rept.,

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

Personal Author(s) : Herrick,Robert M.

Report Date : 18 JUL 1973

Pagination or Media Count : 24

Abstract : In various visual display devices, signals near the limits of vision are presented to the observer. In the present report the literature on the detection of two successive, identical signals is reviewed. Four empirical equations, collectively termed the TEpee effect, give a good description of the data of several studies. The TEpee effect describes the data obtained with several background luminances, with different flash durations, with different colors, with increments (flashes) as well as decrements, and with both monocular and binocular viewing. The TEpee effect also describes data obtained with multiple identical flashes, with two electrical pulses (phosphene threshold), and, possibly, with the interaction of two supraliminal flashes. The TEpee effect is limited to identical flashes presented foveally. It does not describe the interaction of non-identical flashes, nor does it describe the interaction of flashes in the peripheral retina. (Author)

Descriptors :   *Visual signals, *Visual perception, Vision, Thresholds(Physiology), Light, Display systems, Detection

Subject Categories : Psychology
      Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE