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Texture segregation by chromatic and achromatic visual pathways: An analogy with motion processing

Motion experiments with 3 observers (2 experienced, 1 naive) showed that texture segregation was obtained through the coherent spatial grouping of local shape (orientation) and of local color under both nonequiluminant and equiluminant conditions. Color grouping entailed texture segregation independent of orientation grouping, while the reverse was not true under equiluminant conditions. Results also suggest that the perceptual rules governing spatial grouping are analogous (if not identical) to those governing spatiotemporal grouping. As in the case of directional discrimination, texture-discrimination performances may be accounted for by the activation of higher-order units receiving inputs from subunits, all of which display similar tuning properties within a multidimensional space. (PsycINFO Database Record (c) 2005 APA, all rights reserved)



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