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Motion aftereffect: A global mechanism for the perception of rotation.

160 university students, faculty, and staff members adapted to motion by looking at rotating logarithmic spirals. Ss were tested with a stationary mirror image of the adapting spiral in which all contours were at 90 deg to those of the 1st spiral. Motion aftereffects were reported in the contrarotational direction--that is, Ss who had seen clockwise rotating motion reported seeing counterclockwise aftereffects. These aftereffects lasted one-third as long as the aftereffects obtained when the adapting spiral was used as the test figure. These 2 aftereffects had different storage properties, thereby indexing the operation of at least 2 different mechanisms. Results suggest that the motion aftereffect that is obtained with the mirror-image stimulus is indicative of the existence of global rotation detectors. (14 ref) (PsycINFO Database Record (c) 2007 APA, all rights reserved)



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