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. 1997 Jun 6;276(5318):1551-5.
doi: 10.1126/science.276.5318.1551.

Orientation selectivity in pinwheel centers in cat striate cortex

P E Maldonado  1 , I Gödecke, C M Gray, T Bonhoeffer
Affiliations

Orientation selectivity in pinwheel centers in cat striate cortex

P E Maldonado et al. Science. .

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.

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