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Motion: The long and short of it.

Asserts that differences between short- and long-range motion phenomena are a direct consequence of stimuli used in the 2 paradigms and are not evidence for the existence of 2 qualitatively different motion processes. Rather, a single style of motion analysis, similar to W. Reichardt's (1961) and D. Marr and S. Ullman's (1981) motion detectors, underlies motion phenomena. A review of studies of 2nd-order motion stimuli shows that they share the basic phenomena observed for 1st-order stimuli. Similarity across stimulus types suggests a concatenation of a common mode of initial motion extraction followed by a general inference process. (PsycINFO Database Record (c) 2007 APA, all rights reserved)



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