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Motion perception with spatiotemporally matched chromatic and achromatic information reveals a "slow" and "fast" motion system

Examined the similarity principle as it relates to the spatiotemporal combination of pure chromatic and pure luminance information. Data indicate that the "similarity principle" is indeed infringed at low (<= 2.5 Hz) but not at high (>=7.5 Hz) temporal frequencies. Data support the idea of 2 motion systems, a fast/specific one, integrating information only from similar subunits, and a slow/specific one, integrating information across dissimilar subunits (in the present case, across the chromatic and achromatic domains). This dichotomy is also supported by the finding that chromatic reverse-phi can be observed at medium temporal frequencies but is replaced by direct motion at low temporal frequencies, presumably within the range of the slow/specific system. (PsycINFO Database Record (c) 2005 APA, all rights reserved)



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