Abstract
Four-day-old Vantress × Arbor Acre chicks were first trained to key-peck for heat reinforcement and then tested for passive avoidance learning following an intraperitoneal injection of atropine sulfate or saline. Chicks injected with 1.0 mg/kg of atropine responded more quickly than saline-injected chicks when their key-peck responses were punished with aversive wing-shocks. These findings, therefore, are consistent with the view that cholinergic mechanisms are involved in inhibitory behavior in the young domestic chick.
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