Accession Number:

ADA192207

Title:

Interactions between Brief Flashed Lines at Threshold.

Descriptive Note:

Final rept. 1978-1987,

Corporate Author:

NEW HAMPSHIRE UNIV DURHAM VISION RESEARCH LAB

Personal Author(s):

Report Date:

1987-12-11

Pagination or Media Count:

95.0

Abstract:

Our results are concentrated in seven basic areas 1 We find that masking is subject to considerable learning effects. Webers Law is only observed--when proper controls are used--in the relatively uninteresting case where it is inherent in the stimulus, and is unaffected by visual physiology. 2 There is a region of spacetime separations wherein two flashed lines will show lateral facilitation, rather than inhibition, suggesting the action of a motion-detector. 3 substantial modelling of line interactions confirmed our conclusion that this facilitation was a nonlinear effect, and not predictable from current probability-summation models. 4 Spatial summation and 2-line acuity change very differential with retinal eccentricity it may be that one taps primarily receptor size while the other taps receptor separation. 5 It is possible to observe visual aliasing in the parafovea without the use of interference fringes. This aliasing appears to be neural, rather than receptoral. 6 Flashed presentations produce a large transient change in the area of spatial summation and in the amount of lateral inhibition. Keywords Vision Visual masking Spatial sampling Spatial summation Motion detection.

Subject Categories:

  • Anatomy and Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE