Normalization: contrast-gain control in simple (Fourier) and complex (non-Fourier) pathways of pattern vision.
Results from two types of texture-segregation experiments considered jointly demonstrate that the heavily-compressive intensive nonlinearity acting in static pattern vision is not a relatively early, local gain control like light adaptation in the retina or LGN. Nor can it be a late, within-channel contrast-gain control. All the results suggest that it is inhibition among channels as in a normalization network. The normalization pool affects the complex-channel (second-order, non-Fourier) pathway in the same manner in which it affects the simple-channel (first-order, Fourier) pathway, but it is not yet known whether complex channels' outputs are part of the normalization pool.
Graham
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Department of Psychology, Columbia University, 10027, New York, NY, USA. nvg@psych.columbia.edu
Sutter
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D005556:Form Perception / Q000502:physiology; D005583:Fourier Analysis; D006801:Humans; D010364:Pattern Recognition, Visual / Q000502:physiology*; D014795:Visual Pathways / Q000502:physiology*