Abstract
One minute after single-trial avoidance conditioning, young cockerels received intracerebroventricular or intraperitoneal injections of saline or arginine vasotocin (dose range: 0.004 to 16 μg/chick). Retroactive enhancement of the learned response was observed 24 hours post-training for some dose levels, but not for others. A 0.4 μg vasotocin dose also delayed extinction when injected 9 minutes after training. Behavioral similarities between avian and mammalian responses to vasotocin and other neuroactive peptides are discussed.
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