title: Auditory evoked potentials in the auditory system of a beluga whale Delphinapterus leucas to prolonged sound stimuli.
abstract: The effects of prolonged (up to 1500 s) sound stimuli (tone pip trains) on evoked potentials (the rate following response, RFR) were investigated in a beluga whale. The stimuli (rhythmic tone pips) were of frequencies of 45, 64, and 90 kHz at levels from 20 to 60 dB above threshold. Two experimental protocols were used: short- and long-duration. For the short-duration protocol, the stimuli were 500-ms-long pip trains that repeated at a rate of 0.4 trains/s. For the long-duration protocol, the stimuli were continuous pip successions lasting up to 1500 s. The RFR amplitude gradually decreased by three to seven times from 10 ms to 1500 s of stimulation. Decrease of response amplitude during stimulation was approximately proportional to initial (at the start of stimulation) response amplitude. Therefore, even for low stimulus level (down to 20 dB above the baseline threshold) the response was never suppressed completely. The RFR amplitude decay that occurred during stimulation could be satisfactorily approximated by a combination of two exponents with time constants of 30-80 ms and 3.1-17.6 s. The role of adaptation in the described effects and the impact of noise on the acoustic orientation of odontocetes are discussed.
authors.affiliation: Institute of Ecology and Evolution, Russian Academy of Sciences, 33 Leninsky Prospect, 119071 Moscow, Russia.
authors.forename: Vladimir V
authors.initials: VV
authors.lastname: Popov
authors.affiliation: Institute of Ecology and Evolution, Russian Academy of Sciences, 33 Leninsky Prospect, 119071 Moscow, Russia.
authors.forename: Evgenia V
authors.initials: EV
authors.lastname: Sysueva
authors.affiliation: Institute of Ecology and Evolution, Russian Academy of Sciences, 33 Leninsky Prospect, 119071 Moscow, Russia.
authors.forename: Dmitry I
authors.initials: DI
authors.lastname: Nechaev
authors.affiliation: Institute of Ecology and Evolution, Russian Academy of Sciences, 33 Leninsky Prospect, 119071 Moscow, Russia.
authors.forename: Vyatcheslav V
authors.initials: VV
authors.lastname: Rozhnov
authors.affiliation: Institute of Ecology and Evolution, Russian Academy of Sciences, 33 Leninsky Prospect, 119071 Moscow, Russia.
authors.forename: Alexander Ya
authors.initials: AY
authors.lastname: Supin
mesh_terms: D000161:Acoustic Stimulation; D000162:Acoustics; D000223:Adaptation, Psychological; D000818:Animals; D001299:Audiometry; D001306:Auditory Pathways / Q000502:physiology; D001307:Auditory Perception; D001309:Auditory Threshold; D050643:Beluga Whale / Q000502:physiology / Q000523:psychology*; D005072:Evoked Potentials, Auditory; D005260:Female; D009622:Noise / Q000009:adverse effects; D010470:Perceptual Masking; D013017:Sound Localization; D013997:Time Factors