Accession Number:

ADA167138

Title:

Quantification of Interference and Detectability Properties of Visual Stimuli for Optimal Display Design.

Descriptive Note:

Final rept. Jun 81-Feb 85,

Corporate Author:

HARVARD UNIV CAMBRIDGE MA DIV OF APPLIED SCIENCES

Personal Author(s):

Report Date:

1986-01-31

Pagination or Media Count:

36.0

Abstract:

Masking provides information about spatial-temporal tuning of detectors. The detectability of a test sine-wave grating was measured in the presence of a mask of one or more sine-wave gratings. Patterns varied in spatial frequency, orientation and velocity. Conclusions of 4 studies are 1 Orientation and spatial frequency tuning are not separable changing relative mask-test spatial frequency changes orientation tuning. 2 Patterns moving in opposite directions are not detected independently right and left moving patterns mask each other and are detected by opponent-motion mechanisms sensitive to opposite velocities. At threshold, opposite directions may be detected independently. 3 Masking of a wide range of tests by a vertical mask of 4cpd, moving left or right at 4 hz, showed a asymmetry wherein low spatial and temporal tests were strongly masked and high spatial frequencies were facilitated b non-separability of the three tuning variable of spatial and temporal frequency and orientation, ruling out simple explanation. 4 A mask consisting of a small group of spectral components simulating bandlimited 2D noise produced strong masking by obscuring beats that would otherwise occur and aid detection when a single sine-wave test grating is added to a single sine-wave mask. Keywords Human vision, Psychophysics, and Masking.

Subject Categories:

  • Psychology
  • Anatomy and Physiology
  • Human Factors Engineering and Man Machine Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE