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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. 3 — Mar. 1, 1999
  • pp: 718–727

Noise location and the slope of the psychometric function for simple motion stimuli

Bryan L. Gros, David R. Pope, and Theodore E. Cohn  »View Author Affiliations


JOSA A, Vol. 16, Issue 3, pp. 718-727 (1999)
http://dx.doi.org/10.1364/JOSAA.16.000718


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Abstract

We measured subject performance as a function of luminance for both detection and discrimination of increment stimuli; some were static, and some were arranged to give two-step apparent motion. Our aim was to examine a prediction for the shape of the psychometric function for motion: an accelerating function due to the presence of a multiplicative nonlinearity contained in many low-level motion models. For the tasks with static stimuli we found psychometric function slopes (of log d versus log luminance plots) between 1.9 and 2.4 in two subjects, as previously reported. For the tasks with apparent motion stimuli in the same range of detectability, however, the slopes are between 1.2 and 1.7. The lower slopes indicate that many low-level motion models are either incorrect or incomplete as currently specified, and changes in nonlinearities and noise placement are discussed.

© 1999 Optical Society of America

OCIS Codes
(330.4060) Vision, color, and visual optics : Vision modeling
(330.4150) Vision, color, and visual optics : Motion detection
(330.5510) Vision, color, and visual optics : Psychophysics
(330.6100) Vision, color, and visual optics : Spatial discrimination
(330.7310) Vision, color, and visual optics : Vision

History
Original Manuscript: June 5, 1998
Revised Manuscript: November 3, 1998
Manuscript Accepted: November 12, 1998
Published: March 1, 1999

Citation
Bryan L. Gros, David R. Pope, and Theodore E. Cohn, "Noise location and the slope of the psychometric function for simple motion stimuli," J. Opt. Soc. Am. A 16, 718-727 (1999)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-16-3-718

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