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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

  • Editor: Stephen A. Burns
  • Vol. 22, Iss. 10 — Oct. 1, 2005
  • pp: 2239–2245

Spatial frequency tuning of brightness polarity identification

Viljami R. Salmela and Pentti I. Laurinen  »View Author Affiliations


JOSA A, Vol. 22, Issue 10, pp. 2239-2245 (2005)
http://dx.doi.org/10.1364/JOSAA.22.002239


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Abstract

Recent studies have shown that cells in the primary visual cortex can, in addition to borders, also encode surface brightness. Whether the brightness is encoded by a large extraclassical receptive field or by a filling-in type mechanism activated by the luminance border is not known. These explanations imply different spatial frequency tunings for the underlying mechanism. In a psychophysical masking paradigm we measured spatial frequency tuning functions for identification of both luminance polarity (bright/dark) and luminance border orientation of oval and circular luminance patches with variable diameters ( 0.2 10 deg ) . For both tasks we obtained nearly overlapping narrow (1.5 octave) bandpass masking tuning functions centered at 1.5 5.0 c deg . Stimulus size and shape had only minimal effect on the tuning functions. The results favor the idea of brightness filling-in and suggest that the cells activated by the luminance border modulate the activity of the cells signaling surface brightness. Further, the brightness processing mechanism is spatial frequency selective.

© 2005 Optical Society of America

OCIS Codes
(330.5510) Vision, color, and visual optics : Psychophysics
(330.6110) Vision, color, and visual optics : Spatial filtering
(330.7310) Vision, color, and visual optics : Vision

ToC Category:
Form Perception

History
Original Manuscript: December 23, 2004
Revised Manuscript: May 11, 2005
Manuscript Accepted: May 23, 2005
Published: October 1, 2005

Citation
Viljami R. Salmela and Pentti I. Laurinen, "Spatial frequency tuning of brightness polarity identification," J. Opt. Soc. Am. A 22, 2239-2245 (2005)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-22-10-2239

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