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Group mean scores on the DNMS performance test. The curves on the left show the effects of imposition of increasingly longer delays between sample presentation and choice, whereas the curves on theright show the effects of list-length testing. For each list item the minimal delay is 20 sec × the length of the list.SELECTIVE AH, Monkeys with bilateral excitotoxic lesions of the amygdala and hippocampus; NORMAL CONTROL, unoperated control monkeys.
