The acoustic organization of the defensive behaviour was studied in Pied Flycatcher nestlings. Electrodes were chronically implanted into the field L and the neck muscles for auditory EPs and EMG recordings. A well developed defensive reaction which under natural conditions is elicited by species-specific alarm call, could be artificially provoked by monotonal 4.5-6 kHz bursts with repetition frequency of 4-0,8/s. The tone frequency was shown to be the critical acoustic parameter permitting the altricial nestlings to identify alarm vocalization and differentiate it from alimentary signals. The role of the burst repetition frequency is restricted to maintaining the tonic defensive activation in the course of the alarm signal presentation. Certain correlation was found between the time of regeneration of excitability in auditory structures and the burst repetition frequency in the species specific alarm signal.
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