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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. 16, Iss. 12 — Dec. 1, 1999
  • pp: 2817–2824

Apparent speed and speed sensitivity during adaptation to motion

Peter J. Bex, Samantha Bedingham, and Stephen T. Hammett  »View Author Affiliations


JOSA A, Vol. 16, Issue 12, pp. 2817-2824 (1999)
http://dx.doi.org/10.1364/JOSAA.16.002817


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Abstract

Adaptation, a change in response to a sustained stimulus, can be demonstrated in motion perception by velocity aftereffects—changes in the apparent speed of a moving pattern following adaptation. We measured changes in the apparent speed of sinusoidal gratings drifting at 4 or 7.5 deg/s during 30 s of adaptation followed by 30 s of recovery. The apparent speed of the patterns fell to approximately half the unadapted apparent speed, and the time constants of adaptation were much faster (5 s) than for recovery (22 s). Part of the loss of apparent speed (approximately 12%) was related to a loss of apparent contrast with adaptation. Sensitivity to speed increments and speed decrements increased during adaptation and was well described by a Weber fraction based on apparent speed. The results suggest that adaptation to motion, like light adaptation, may serve to improve an observer’s sensitivity to the prevailing environment.

© 1999 Optical Society of America

OCIS Codes
(330.4150) Vision, color, and visual optics : Motion detection
(330.5020) Vision, color, and visual optics : Perception psychology
(330.5510) Vision, color, and visual optics : Psychophysics
(330.6790) Vision, color, and visual optics : Temporal discrimination
(330.7310) Vision, color, and visual optics : Vision
(330.7320) Vision, color, and visual optics : Vision adaptation

Citation
Peter J. Bex, Samantha Bedingham, and Stephen T. Hammett, "Apparent speed and speed sensitivity during adaptation to motion," J. Opt. Soc. Am. A 16, 2817-2824 (1999)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-16-12-2817

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