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The effect of serotonin on memory retention in chicks given strongly reinforced training. (A) 5.0 nmol/hem serotonin resulted in the inhibition of memory consolidation when injected between -5 and +2.5 min relative to training, n = 16–19 per group. (B) this dose of serotonin injected immediately after training resulted in the gradual loss of memory after 30 min post training, n = 15–20 per group, *P < 0.05 compared to saline-injected animals.
