title: [The development of hearing sensitivity in altricial birds: the absolute thresholds of the generation of evoked potentials].
abstract: Thresholds of field L auditory evoked potentials EP were studied in 1.5-9-day-old nestlings of pied flycatcher in response to pure tone signals of different frequencies. According to the tendencies of age dynamics of auditory EP thresholds (2-9 days of life) all hearing range was divided into three separate channels: low-frequency (0.3-1.0 kHz), intermediate-(1.5-4.0 kHz) and high-frequency (5.0-8.0 kHz) ones. The widening of the hearing range in its high-frequency part was demonstrated on days 4-5 of life. The development of auditory sensitivity was shown to continue within all three channels in postembryonic period (days 2-9 post-hatching), each of the channels being characterized by its own age dynamics of auditory EP thresholds. Reproduction of tape-recorded species song during days 1-3 post-hatching resulted in significant decrease of auditory EP thresholds.
authors.forename: L I
authors.initials: LI
authors.lastname: Aleksandrov
authors.forename: L P
authors.initials: LP
authors.lastname: Dmitrieva
mesh_terms: D000161:Acoustic Stimulation / Q000295:instrumentation / Q000379:methods; D000375:Aging / Q000502:physiology; D000818:Animals; D001309:Auditory Threshold / Q000502:physiology*; D001717:Birds / Q000502:physiology*; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D006309:Hearing / Q000502:physiology*; D008838:Microcomputers; D013045:Species Specificity; D014828:Vocalization, Animal / Q000502:physiology
vernacular_title: Razvitie slukhovoĭ chuvstvitel'nosti nezrelorozhdaiushchikhsia ptits: absoliutnye porogi generatsii vyzvannykh potentsialov.