Accession Number : ADA321301

Title :   Visual and Auditory Sensitivities and Discriminations.

Descriptive Note : Final rept. 15 Dec 93-14 Dec 96,

Corporate Author : YORK UNIV NORTH YORK (ONTARIO)

Personal Author(s) : Regan, David

PDF Url : ADA321301

Report Date : 14 DEC 1996

Pagination or Media Count : 163

Abstract : (1) The ability to judge time to collision with an approaching object is high in central vision but considerably poorer in peripheral vision. (2) A pilot's time to collision with a simulated approaching helicopter depends on the relative contributions of ownship speed and target speed. (3) Binocular judgements of the direction of motion in depth are similar for motion in the vertical and horizontal meridians. (4) Spatial frequency, temporal frequency, orientation and contrast are processed independently and in parallel. (5) Orientation discrimination for cyclopean form and texture-defmed form can be as acute as for luminance-defined form. (6) A letter test for measuring the ability to see and recognize texture-defined form has been made freely available. (7) A physiologically-plausible model of the recognition of texture-defined letters has been developed. (8) The ability to recognize texture-defined, motion-defined and luminance-defined letters can be independently lost in patients with multiple sclerosis. (9) Magnetic brain recording has been used to identify and locate an audio-visual convergence area in human brairand centres for color-defined, texture-defined and luminance-defined form. (10) Mathematical methods for obtaining the response of auditory hair cells to complex amplitude modulated tones and the harmonic distortion of a pure tone caused by the hair cell transducer function have been developed.

Descriptors :   *SPATIAL DISTRIBUTION, *VISUAL ACUITY, *AUDITORY ACUITY, VELOCITY, BRAIN, PILOTS, ORIENTATION(DIRECTION), SENSITIVITY, HELICOPTERS, VISION, NUMERICAL METHODS AND PROCEDURES, DISCRIMINATION, JUDGEMENT(PSYCHOLOGY), CELLS(BIOLOGY), HEARING, COLLISIONS, LUMINANCE, AMPLITUDE MODULATION, BINOCULARS, AUDIO TONES, MAGNETIC RECORDING SYSTEMS, PERIPHERAL VISION, HAIR.

Subject Categories : Anatomy and Physiology
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE