Frequency Resolving Power of the Auditory System in a Bottlenose Dolphin (Tursiops Truncatus)

Supin, Alexander Ya.; Pletenko, Mikhail G.; Tarakanov, Mikhail B.

doi:10.1007/978-1-4615-3406-8_20

Cited by 5 publications

References 9 publications

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Frequency Tuning of Hearing in the Beluga Whale

Sysueva

Nechaev

Попов

et al. 2016

The Effects of Noise on Aquatic Life II

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Data on frequency tuning in odontocetes are contradictory: different authors have reported filter qualities from 2 to almost 50. In this study, frequency tuning was measured in a beluga whale (Delphinapterus leucas) using a rippled-noise test stimulus in conjunction with the auditory evoked potential (AEP) technique. The response to ripple reversions was considered to indicate resolvability of the ripple pattern. The limit of ripple-pattern resolution ranged from 20 to 32 ripples per octave (rpo). A model of interaction of the ripple spectrum with frequency-tuned filters suggests that this resolution limit requires a filter quality of 29-46.

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Frequency Tuning of Hearing in the Beluga Whale

Sysueva

Nechaev

Попов

et al. 2016

The Effects of Noise on Aquatic Life II

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Analysis of auditory information in the brains of cetaceans

Supin

2007

Neurosci Behav Physiol

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A characteristic feature of the brains of toothed cetaceans is the exclusive development of the auditory neural centers. The location of the projection sensory zones, including the auditory zones, in the cetacean cortex is significantly different from that in other mammals. The characteristics of evoked potentials demonstrate the existence of several functional subdivisions in the auditory cortex. Physiological studies of the auditory neural centers of cetaceans have been performed predominantly using the evoked potentials method. Of the several types of evoked potentials available for non-invasive recording, the most detailed studies have been performed using short-latency auditory evoked potentials (SLAEP). SLAEP in cetaceans are characterized by exclusively high time resolution, with integration times of about 0.3 msec, which on the frequency scale corresponds to a cut-off frequency of 1700 Hz. This is more than an order of magnitude greater than the time resolution of hearing in terrestrial mammals. The frequency selectivity of hearing in cetaceans has been measured using several versions of the masking method. The acuity of frequency selectivity in cetaceans is several times greater than that in most terrestrial mammals (except bats). The acute frequency selectivity allows the discrimination of very fine spectral patterns of sound signals.

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Frequency tuning of hearing in the beluga whale: Discrimination of rippled spectra

Sysueva

Nechaev

Попов

et al. 2014

The Journal of the Acoustical Society of America

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Frequency tuning was measured in the beluga whale (Delphinapterus leucas) using rippled-noise test stimuli in conjunction with an auditory evoked potential (AEP) technique. The test stimulus was a 2-octave-wide rippled noise with frequency-proportional ripple spacing. The rippled-noise signal contained either a single reversal or rhythmic (1-kHz rate) reversals of the ripple phase. Single or rhythmic phase reversals evoked, respectively, a single auditory brainstem response (ABR) or a rhythmic AEP sequence-the envelope following response (EFR). The response was considered as an indication of resolvability of the ripple pattern. The rhythmic phase-reversal test with EFR recording revealed higher resolution than the single phase-reversal test with single ABR recording. The limit of ripple-pattern resolution with the single phase-reversal test ranged from 17 ripples per octave (rpo) at 32 kHz to 24 rpo at 45 to 64 kHz; for the rhythmic phase-reversal test, the limit ranged from 20 to 32 rpo. An interaction model of a ripple spectrum with frequency-tuned filters suggests that the ripple-pattern resolution limit of 20 to 32 rpo requires a filter quality Q of 29 to 46. Possible causes of disagreement of these estimates with several previously published data are discussed.

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Frequency Resolving Power of the Auditory System in a Bottlenose Dolphin (Tursiops Truncatus)

Cited by 5 publications

References 9 publications

Frequency Tuning of Hearing in the Beluga Whale

Frequency Tuning of Hearing in the Beluga Whale

Analysis of auditory information in the brains of cetaceans

Frequency tuning of hearing in the beluga whale: Discrimination of rippled spectra

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