Quantification of Interference and Detectability Properties of Visual Stimuli for Optimal Display Design.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 31, 1986
- Accession Number
- ADA167138
Entities
People
- Richard E. Kronauer
Organizations
- Harvard University