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Effects of Cholinergic Deafferentation of the Rhinal Cortex on Visual Recognition Memory in Monkeys

Janita Turchi, Richard C. Saunders and Mortimer Mishkin
Proceedings of the National Academy of Sciences of the United States of America
Vol. 102, No. 6 (Feb. 8, 2005), pp. 2158-2161
Stable URL: http://www.jstor.org/stable/3374578
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effects of Cholinergic Deafferentation of the Rhinal Cortex on Visual Recognition Memory in Monkeys
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Abstract

Excitotoxic lesion studies have confirmed that the rhinal cortex is essential for visual recognition ability in monkeys. To evaluate the mnemonic role of cholinergic inputs to this cortical region, we compared the visual recognition performance of monkeys given rhinal cortex infusions of a selective cholinergic immunotoxin, ME20.4-SAP, with the performance of monkeys given control infusions into this same tissue. The immunotoxin, which leads to selective cholinergic deafferentation of the infused cortex, yielded recognition deficits of the same magnitude as those produced by excitotoxic lesions of this region, providing the most direct demonstration to date that cholinergic activation of the rhinal cortex is essential for storing the representations of new visual stimuli and thereby enabling their later recognition.

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