Accession Number : AD0686672

Title :   TWO-FLASH THRESHOLDS AS A FUNCTION OF FLASH LUMINANCE AND AREA,

Corporate Author : CIVIL AEROMEDICAL INST OKLAHOMA CITY OKLA

Personal Author(s) : Lewis,Mark F.

Report Date : SEP 1968

Pagination or Media Count : 10

Abstract : The recent use of strobe lights in aviation suggests the possibility of using temporal patterns of short duration flashes as information-carrying signals. Under night flight conditions, two-flash thresholds were obtained using a two-interval, temporal forced-choice technique with foveally fixated circular targets varying in luminance and area. For all subjects the results replicated a previous finding that two-flash thresholds are a negatively accelerated function of flash luminance, but the function was shown to be dependent on area, a greater threshold change occurring at smaller areas. Two-flash thresholds were also found to be a decreasing function of stimulus area, with the greatest threshold change occurring at low luminances. (Author)

Descriptors :   (*VISUAL PERCEPTION, LIGHTING EQUIPMENT), (*AVIATION SAFETY, OPTICAL COMMUNICATIONS), (*OPTICAL COMMUNICATIONS, STROBOSCOPES), INFORMATION THEORY, LIGHTING EQUIPMENT, RESPONSE(BIOLOGY), EYE, STIMULATION(PHYSIOLOGY), THRESHOLDS(PHYSIOLOGY)

Subject Categories : Terminal Flight Facilities
      Anatomy and Physiology
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE