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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 16, Iss. 4 — Apr. 1, 1999
  • pp: 793–803

Surround articulation. I. Brightness judgments

James A. Schirillo  »View Author Affiliations

JOSA A, Vol. 16, Issue 4, pp. 793-803 (1999)

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It has been hypothesized that brightness judgments require an estimate of the illuminant. Making this estimate is difficult since luminance edges can be the result of changes in either illumination or reflectance. Articulation is the addition of equally spaced incremental and decremental patches within a surround while preserving the surround’s space-average luminance. It is proposed that articulation enhances the inference that the surround’s luminance edge is due to a change in illumination rather than in reflectance. Articulation results in a corresponding shift in brightness judgments for test-patch increments but not for decrements. This finding concurs with ArendGoldstein’s [J. Opt. Soc. Am. A 4, 2281 (1987)] reported shifts in brightness as simple center-surround stimuli are transformed into more complex ecologically valid Mondrians.

© 1999 Optical Society of America

OCIS Codes
(330.0330) Vision, color, and visual optics : Vision, color, and visual optics
(330.1690) Vision, color, and visual optics : Color
(330.1720) Vision, color, and visual optics : Color vision

Original Manuscript: October 19, 1998
Revised Manuscript: November 25, 1998
Manuscript Accepted: October 28, 1998
Published: April 1, 1999

James A. Schirillo, "Surround articulation. I. Brightness judgments," J. Opt. Soc. Am. A 16, 793-803 (1999)

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