@article {53299,
	title = {Differential hearing sensitivity in the adaptive background in a beluga whale},
	journal = {The Journal of the Acoustical Society of America},
	volume = {144},
	year = {2018},
	month = {Jan-09-2018},
	pages = {1979 - 1979},
	abstract = {<p>The ability of the auditory system to maintain high differential sensitivity in the adaptive background was investigated in a beluga whale (Delphinapterus leucas). Adaptive background was a train of tone pips following one another at a rate of 1 kHz. Each pip consisted of eight carrier cycles of 64 kHz. Every 128 ms, the train of pips was interrupted for 16 ms and replaced with a test signal (16-ms series of the same tone pips as in the adaptive background, but of another level). The level of the test signals varied from -15 to +\&thinsp;20 dB relative the level of adaptive background. Evoked potentials (the rate following response, RFR) produced by the test signals were recorded. Increasing of adaptive level led to RFR thresholds growth. The 10-dB rising of adaptive signals intensity level led to 7.8 dB rising of test signal threshold. The response amplitude dependence on the test stimulus level was almost independent of the level of the adaptive background. Thus, the beluga\&rsquo;s auditory system displayed high sensitivity to the change in acoustic signal level in the high-level background. [This study was supported by the Russian Foundation for Basic Research (Grant No. 18-04-00088).]</p>
},
	issn = {0001-4966},
	doi = {10.1121/1.5068643},
	url = {http://asa.scitation.org/doi/10.1121/1.5068643},
	author = {Popov, Vladimir and Nechaev, Dmitry and Supin, Alexander and Sysueva, Evgeniya}
}
@article {53269,
	title = {Responses of the auditory system of odontocetes to level changes of long lasting acoustical stimuli},
	journal = {The Journal of the Acoustical Society of America},
	volume = {144},
	year = {2018},
	month = {Jan-09-2018},
	pages = {1741 - 1741},
	abstract = {<p>The effects of level changes of long lasting sound stimuli (tone pip trains) on evoked potentials (the rate following response, RFR) were investigated in a beluga whale (Delphinapterus leucas). The stimuli were of 64 kHz carrier frequency at levels from 80 to 140 dB re 1 \&mu;Pa. During stimulation, the stimulus level either was kept constant (the steady-state stimulation) or was changed up/down by 20 or 40 dB every 1000 ms. After transition from a lower to upper stimulus level (increase), the response amplitude increased quickly and then decayed slowly. After transition from an upper to lower stimulus level (decrease), the response amplitude fell quickly and later recovered slowly. In the both cases, during the 1000 ms stimulus, the response amplitude almost reached that of the steady-state stimulus of the same level. The auditory system of the beluga (and, hypothetically, other odontocetes) may be characterized as quickly flexible and capable of quick adjustment of its responses to the current auditory scene. [This study was supported the Russian Science Foundation (Project No. 17-74-20107) awarded to E.V.S.]</p>
},
	issn = {0001-4966},
	doi = {10.1121/1.5067719},
	url = {http://asa.scitation.org/doi/10.1121/1.5067719},
	author = {Sysueva, Evgeniya and Nechaev, Dmitry and Supin, Alexander and Popov, Vladimir}
}
