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Orientation Selectivity in Pinwheel Centers in Cat Striate Cortex

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Science  06 Jun 1997:
Vol. 276, Issue 5318, pp. 1551-1555
DOI: 10.1126/science.276.5318.1551

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Abstract

In primary visual cortex of higher mammals neurons are grouped according to their orientation preference, forming “pinwheels” around “orientation centers.” Although the general structure of orientation maps is largely resolved, the microscopic arrangement of neuronal response properties in the orientation centers has remained elusive. The tetrode technique, enabling multiple single-unit recordings, in combination with intrinsic signal imaging was used to reveal the fine-grain structure of orientation maps in these locations. The results show that orientation centers represent locations where orientation columns converge containing normal, sharply tuned neurons of different orientation preference lying in close proximity.

  • * These authors contributed equally to the work.

  • To whom correspondence should be addressed at The Center for Neuroscience, University of California, Davis, CA 95616, USA. E-mail: pedro{at}chaos.ucdavis.edu

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