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J Neurosci. 2000 Jan 1;20(1):451-63.

Impaired recognition memory in monkeys after damage limited to the hippocampal region.

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  • 1Veterans Affairs Medical Center, San Diego, California 92126, USA.


Monkeys with lesions limited to the hippocampal region (the hippocampus proper, the dentate gyrus, and the subiculum) were impaired on two tasks of recognition memory: delayed nonmatching to sample and the visual paired-comparison task. Recognition memory was impaired in five different groups of monkeys, whether the lesions were made by an ischemic procedure, by radio frequency, or by ibotenic acid. The finding that the hippocampal region is essential for normal recognition memory performance is considered in the context of current ideas about the role of the hippocampus in declarative memory.

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