Visual Motion Perception and Visual Information Processing
Abstract
This final progress report summaries the results of a study that successfully determined the functional architecture of visual motion perception, in the sense of defining the mechanisms involved and the relations between them. It was proved that visual motion is computed by two neural systems: primitive motion-energy extraction (e.g., Reichardt detector) and higher-level feature tracking. A psychophysical pedestal paradigm was used to exclude the feature- tracking process and thereby to obtain pure measures of motion-energy extraction. Motion energy extraction was found to be exclusively monocular, fast (cutoff frequency is 12 Hz) and sensitive (can utilize 0.2% contrast), 'bottom- up', and, to operate on both luminance (first-order) and contrast (second-order) motion stimuli. Motion feature tracking was found to operate interocularly as well as monocularly, have a cutoff frequency of 3 Hz, and to be both bottom up (it computes motion from luminance, contrast, depth, motion-motion, flicker and other type of stimuli) and top-down (e.g., attentional states influence what appears to move). The full report is appended.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 28, 1994
- Accession Number
- ADA282928
Entities
People
- George Sperling
Organizations
- University of California, Irvine