Luminance is processed linearly in apparent motion, vernier offset and stereo depth

Smith, D. and Anstis, S. and Mather, G. (1997) Luminance is processed linearly in apparent motion, vernier offset and stereo depth. Investigative Ophthalmology and Visual Science, 38 (4). S376. ISSN 0146-0404

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Abstract

PURPOSE Two potential motions occur when a black and white bar suddenly exchange luminances. The bar differing most from the surround luminance is seen as moving (Anstis & Mather, 1985). We now extend this result to stereo and Vernier acuity. METHOD Light and dark bars produced opposite motions, vernier offsets or stereo on a grey surround (see Fig.) 5s measured the indifference luminance level of the surround at which motion, Vernier offset or depth were ambiguous or minimal. RESULTS A linear visual response to luminance would put the indifference surround luminance halfway between the luminances of the two bars and the data should lie on the plane surface (x+y)/2. A visual logarithmic transform of input luminance would put the data on the convex-upwards curved surface �(xy). The motion results (below) fit the plane best, so luminance processing is linear. All 3 tasks gave similar results. CONCLUSION Input luminance is processed linearly for all three tasks, with no log transform.

Item Type:Article
Additional Information:Association for Research in Vision and Ophthalmology 1997 annual meeting. Fort Lauderdale, Florida, May 11-16
Keywords:motion; depth; vernier acuity
Subjects:B Subjects allied to Medicine > B140 Neuroscience
C Biological Sciences > C830 Experimental Psychology
Divisions:College of Social Science > School of Psychology
ID Code:16122
Deposited By: George Mather
Deposited On:04 Dec 2014 13:50
Last Modified:04 Dec 2014 13:53

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