Accession Number : AD0626614

Title :   SENSITIVITY OF THE VISUAL SYSTEM TO CHANGES IN THE RATE OF INTERMITTENCE,

Corporate Author : JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s) : Gebhard,J. W. ; Mowbray,G. H.

Report Date : 10 MAR 1958

Pagination or Media Count : 31

Abstract : Experimentation is reported that concerned the relative judgment of frequency of visual flicker. This was the result of investigation into the number of absolutely identifiable steps, difference-limens, or 'just noticeable differences' in such visual scales as size, brightness, hue, or flicker, all being part of the desire to assess the usefulness of visual stimuli for coding information in an electronic data display system. Data were obtained from 3 kinds of photic experiments: frequency matching of 2 pulse trains by the method of adjustment, the method of single stimuli, and perceiving a gap in a pulse train. Determinations were also made of difference-limens for the rate of intermittent electrical phosphenes and for rate discrimination in audition and touch.

Descriptors :   (*THRESHOLDS(PHYSIOLOGY), VISION), (*VISION, THRESHOLDS(PHYSIOLOGY)), TOUCH, HEARING, SENSITIVITY

Subject Categories : Psychology
      Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE