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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. 19, Iss. 7 — Jul. 1, 2002
  • pp: 1259–1266

Contrast discrimination with pulse trains in pink noise

G. B. Henning, C. M. Bird, and F. A. Wichmann  »View Author Affiliations


JOSA A, Vol. 19, Issue 7, pp. 1259-1266 (2002)
http://dx.doi.org/10.1364/JOSAA.19.001259


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Abstract

Detection performance was measured with sinusoidal and pulse-train gratings. Although the 2.09-cycles-per-degree pulse-train, or line, grating contained at least eight harmonics all at equal contrast, it was no more detectable than its most detectable component. The addition of broadband pink noise designed to equalize the detectability of the components of the pulse train made the pulse train approximately a factor of 4 more detectable than any of its components. However, in contrast-discrimination experiments, with a pedestal or masking grating of the same form and phase as the signal and with 15% contrast, the noise did not affect the discrimination performance of the pulse train relative to that obtained with its sinusoidal components. We discuss the implications of these observations for models of early vision, in particular the implications for possible sources of internal noise.

© 2002 Optical Society of America

OCIS Codes
(330.1880) Vision, color, and visual optics : Detection
(330.5000) Vision, color, and visual optics : Vision - patterns and recognition
(330.5510) Vision, color, and visual optics : Psychophysics
(330.7310) Vision, color, and visual optics : Vision

History
Original Manuscript: August 31, 2001
Revised Manuscript: November 30, 2001
Manuscript Accepted: November 30, 2001
Published: July 1, 2002

Citation
G. B. Henning, C. M. Bird, and F. A. Wichmann, "Contrast discrimination with pulse trains in pink noise," J. Opt. Soc. Am. A 19, 1259-1266 (2002)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-19-7-1259


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