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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 18, Iss. 9 — Sep. 1, 2001
  • pp: 2197–2203

Spatial phase sensitivity of mechanisms mediating discrimination of small orientation differences

James P. Thomas and Lynn A. Olzak  »View Author Affiliations


JOSA A, Vol. 18, Issue 9, pp. 2197-2203 (2001)
http://dx.doi.org/10.1364/JOSAA.18.002197


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Abstract

Experiments with spatially superimposed gratings have defined mechanisms that sum signals across spatial frequency bands while mediating discriminations of small differences in orientation. In the present experiments, localized stimuli (Gaussian bars and derivatives of Gaussian bars) occupying different spatial frequency bands were superimposed in different phase and location relationships to assess the sensitivity of the summing mechanisms to these differences. Masking (loss of accuracy when a second component is added as a mask) was unaffected by differences in either phase or location (15 min separation). Summation (increase in accuracy when both components vary together) occurs for all phase relationships but is reduced by spatial separation.

© 2001 Optical Society of America

OCIS Codes
(330.4060) Vision, color, and visual optics : Vision modeling
(330.5510) Vision, color, and visual optics : Psychophysics
(330.6100) Vision, color, and visual optics : Spatial discrimination
(330.6130) Vision, color, and visual optics : Spatial resolution

History
Original Manuscript: November 20, 2000
Revised Manuscript: March 26, 2001
Manuscript Accepted: March 26, 2001
Published: September 1, 2001

Citation
James P. Thomas and Lynn A. Olzak, "Spatial phase sensitivity of mechanisms mediating discrimination of small orientation differences," J. Opt. Soc. Am. A 18, 2197-2203 (2001)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-18-9-2197

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