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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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 â��(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.
|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|
|Deposited By:||George Mather|
|Deposited On:||04 Dec 2014 13:50|
|Last Modified:||04 Dec 2014 13:53|
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