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Evidence against independent processing of black and white pattern features.

Previous research by G. J. Burton et al (1977) and K. K. DeValois (1977), in which Ss observed a shift in the perceived duty cycle of a test grating following adaptation to a rectangular grating, suggests that size information about black and white pattern components may be analyzed independently. This hypothesis was tested by combining adaptation to a 2-cycles/degree rectangular wave grating (narrow white bars and wide black bars or vice versa) with adaptation to a 4-cycles/degree sine wave (narrow white and black bars). Ss were the 2nd author and an undergraduate volunteer. Data do not support the independent analysis of white and black components, but may be accounted for by mechanisms sensitive to the relative phase relations among the spatial frequency components of the input. (11 ref) (PsycINFO Database Record (c) 2007 APA, all rights reserved)



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