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Pigeons, individually trained in two discrimination tasks, with one well learned and one partly learned, showed improvement in relearning each task following injection of the anticholinesterase physostigmine. A control group, receiving saline after 28 days had elapsed from the original training, showed forgetting of the partly learned discrimination. The 28-day physostigmine group showed improvement in the relearning of the partly learned discrimination. These facts suggest that anticholinesterase injection had facilitated the memory of the partly learned task in the experimental group. The failure of anticholinesterase to produce amnesia in pigeons, while apparently facilitating memory for a partly forgotten discrimination, suggests that pigeon memory may operate in a different temporal sequence than does rat memory.

Memory enhancement of a partly-learned discrimination in pigeons by intramuscular injection of physostigmine