Accession Number : ADA259742


Title :   Sensory Sensitivities and Discriminations and Their Roles in Aviation


Descriptive Note : Annual rept. 1 Nov 91-31 Oct 92,


Corporate Author : YORK UNIV NORTH YORK (ONTARIO)


Personal Author(s) : Regan, D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a259742.pdf


Report Date : 30 Nov 1992


Pagination or Media Count : 136


Abstract : (1) Evidence that intersubject differences in the ability to process motion-defined (MD) shape are not predicted by the ability to process luminance- defined (LD) shape, that motion is processed by hierarchical manner, that discrimination and detection can be dissociated for MD form, and that spatial discrimination for MD and LD form are not entirely mediated by the same mechanism is as follows. (A) Reducing presentation duration or dot lifetime from 1.0 to 0.1 sec progressively reduced the visibility of a MD bar, but did not reduce orientation discrimination for the bar when visibility was held constant. (B) Detection and/or recognition of MD letters can be degraded by removal of brain tissues underlying prestriate cortex without affecting contrast sensitivity, Snellen acuity, low contrast acuity or sensitivity to motion. (2) Shape discrimination for an MD rectangle can be as low as 2-3%--as good as for an LD rectangle. (3) Evidence for a neural mechanism sensitive to shape independently of size. (4) Evidence for a neural mechanism directly sensitive to time to collision with an approaching object. A method for measuring intersubject differences in discrimination of time to contact. (5) A titration method for uncovering the color-defined form system. (6) the 40 Hz human brain response indexes magnocellular activity. (7) By recording the magnetic field of the brain we have identified an audio-visual integration area in the brain, we have also unconfounded responses to texture-defined form....Vision, Visual flying skills, Intersubject differences, Visual navigation, Perception of motion and self-motion, Stereo, Neuromagnetic recording, Models of visual and auditory processing, Multisensory convergence.


Descriptors :   *MAGNETIC FIELDS , *VISION , *NEUROLOGY , *VISUAL CORTEX , *AVIATION SAFETY , AIR FORCE RESEARCH , OPTICAL DETECTION , VISUAL PERCEPTION , SHAPE , AIR NAVIGATION


Subject Categories : Psychology
      Anatomy and Physiology
      Medicine and Medical Research
      Optics
      Human Factors Engineering & Man Machine System


Distribution Statement : APPROVED FOR PUBLIC RELEASE