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  • Title: Selectivity for polar, hyperbolic, and Cartesian gratings in macaque visual cortex.
    Author: Gallant JL, Braun J, Van Essen DC.
    Journal: Science; 1993 Jan 01; 259(5091):100-3. PubMed ID: 8418487.
    Abstract:
    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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