Additive effects of forgetting and fornix transfection in the temporal gradient of retrograde amnesia.
Nine Rhesus monkeys (Macaca mulatta) learned to discriminate among 320 complex naturalistic scenes (Set A) for food reward. Six months later they learned to discriminate among a further 192 scenes (Set B). Immediately after learning Set B the animals were given a preoperative retention test of both sets, consisting of a single trial with every scene they had learned. Three monkeys were then operated upon to transect the fornix, the other six forming an unoperated control group. Two weeks afte...Expand abstract
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