Accession Number:

ADA282928

Title:

Visual Motion Perception and Visual Information Processing

Descriptive Note:

Final rept. 1 Dec 1993-28 Feb 1994

Corporate Author:

CALIFORNIA UNIV IRVINE DEPT OF COGNITIVE SCIENCES

Personal Author(s):

Report Date:

1994-02-28

Pagination or Media Count:

20.0

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.

Subject Categories:

  • Anatomy and Physiology
  • Cybernetics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE