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Science 1 January 1993: Vol. 259. no. 5091, pp. 100 - 103 DOI: 10.1126/science.8418487
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Articles
Science, Vol 259, Issue 5091, 100-103
Copyright © 1993 by American Association for the Advancement of Science
Selectivity for polar, hyperbolic, and Cartesian gratings in macaque visual cortex
JL Gallant,
J Braun,
and
DC Van Essen
Division of Biology, California Institute of Technology, Pasadena 91125.
The neural basis of pattern recognition is a central problem in visual neuroscience. Responses of single cells were recorded in area V4 of macaque monkey to three classes of periodic stimuli that are based on spatial derivative operators: polar (concentric and radial), hyperbolic, and conventional sinusoidal (Cartesian) gratings. Of 118 cells tested, 16 percent responded significantly more to polar or hyperbolic (non-Cartesian) gratings than to Cartesian gratings and only 8 percent showed a significant preference for Cartesian gratings. Among cells selective for non-Cartesian gratings, those that preferred concentric gratings were most common. Cells selective for non-Cartesian gratings may constitute an important intermediate stage in pattern recognition and the representation of surface shape.
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