Spatial and Temporal Visual Masking and Visibility.
Abstract
Studies continue on spatio-temporal interactions between briefly-flashed lines. The delayed facilitation we previously reported suggested that we were tapping a motion-detector system. However extensive experiments which failed to correlate our line interactions with the motion aftereffect and other well-known manifestations of motion detection have convinced us that we are measuring something different. We currently believe we may be tapping the moving-object detectors described by Burr. We have demonstrated that transient stimulation produces a substantial change in the configuration of inhibition and excitation, as revealed by summation between briefly-flashed lines. We have extended our studies of summation between lines to parafoveal vision. Unlike most visual functions, spatial summation in the periphery does not increase in direct proportion to cortical magnification. Based on our studies of summation, we predicted and observed that aliasing, though absent in the fovea, should be present in the parafovea. Studies of velocity discrimination suggest that there do not exist a small numer of discrete velocity detectors, but rather a near-continuum of theses. Keywords: Visual targets; Moving targets; Visual perception.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 05, 1986
- Accession Number
- ADA175113
Entities
People
- Robert A. Smith
Organizations
- University of New Hampshire