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Visual paired-comparison performance of normal monkeys (same as in Fig. 7, N) and monkeys with radio-frequency (RF2) lesions or ibotenic acid (IBO2) lesions limited to the hippocampal region.Asterisks indicate impaired performance of the lesion group relative to the N group.Parentheses indicate the number of monkeys in each group. Brackets indicate SEM. The two lesion groups were similarly impaired.
