Brain-stem evoked responses as an index of hearing thresholds in one-day-old chicks and ducklings.

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Abstract
Measured threshold levels of pure-tone evoked responses in the brain stem of 12 24-hr-old White Rock chicks and 14 24-hr-old Peking ducklings. The evoked-response audiograms determined for each species revealed a peak sensitivity at 800 Hz for the chicks and 1,500 Hz for the ducklings. These sensitive regions were related to the dominant frequencies of the maternal call for each species and may indicate part of the auditory perceptual mechanism that operates for species identification of the calls in the young chick and duckling. (25 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)