Maternal hen calls modulate memory formation in the day-old chick: The role of noradretialine

Abstract

Facilitation of memory for discriminative learning in young chicks is enhanced following exposure to a synthesized rhythmic auditory stimulus. Increased arousal, mediated by noradrenergic activation, is believed to underlie this effect. In this report we examine whether ethologically relevant rhythmic auditory stimuli produce the same noradrenaline-mediated memory enhancement in neonate chicks (Gallus gallus domesticus). Maternal hen attraction calls which contained a rhythmic pattern were found to facilitate retention. Intracerebral injection of noradrenaline or the beta(2)-adrenergic antagonist propranolol demonstrated that this enhancement is likely to be mediated by noradrenergic activat..