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Predicting the present

Discuses the observations of R. Nijhawan (see record 84-25201) about predictive perception which allows the brain to compensate for the neural delay that occurs between the arrival of photons at the retina and response of higher visual areas. Two visual mechanisms are discussed in this compensation for objects that are undergoing smooth change (e. g., change in location, brightness or size): subtraction, a process which can disentangle the combined colors of superimposed stimuli, and extraction, a process which can reassign them to a different location in space. (PsycINFO Database Record (c) 2007 APA, all rights reserved)