Estimating bottlenose dolphin (Tursiops truncatus) hearing thresholds from single and multiple simultaneous auditory evoked potentials

被引：0
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作者：
Finneran, James J. [1 ]
Houser, Dorian S. [2 ]
Blasko, Dave [3 ]
Hicks, Christie [3 ]
Hudson, Jim [3 ]
Osborn, Mike [3 ]
机构：
[1] U.S. Navy Marine Mammal Program, Space and Naval Warfare Systems Center, San Diego, 53560 Hull Street, San Diego, CA 92152, United States
[2] Biomimetica, 7951 Shantung Drive, Santee, CA 92071, United States
[3] Mirage Dolphin Habitat, 3400 Las Vegas Boulevard South, Las Vegas, NV 89109, United States
来源：
Journal of the Acoustical Society of America | 2008年 / 123卷 / 01期
关键词：
Hearing thresholds were estimated in four bottlenose dolphins by measuring auditory evoked responses to single and multiple sinusoidal amplitude modulated tones. Subjects consisted of two males and two females with ages from 4 to 22 years. Testing was conducted in air using a jawphone transducer to couple sound into each subject's lower right jaw. Carrier frequencies ranged from 10 to 160 kHz in one-half octave steps. Amplitude modulated stimuli were presented individually and as the sum of four; five; and nine simultaneous tones with unique carrier and modulation frequencies. Evoked potentials were noninvasively recorded using surface electrodes embedded in silicon suction cups. The presence or absence of an evoked response at each modulation frequency was assessed by calculating the magnitude-squared coherence from the frequency spectra of the recorded sweeps. All subjects exhibited traditional U-shaped audiograms with upper cutoff frequencies above 113 kHz. The time required for threshold estimates ranged from 23 to 37 min for single stimuli to 5-9 min for nine simultaneous stimuli. Agreement between thresholds estimated from single stimuli and multiple; simultaneous stimuli was generally good; indicating that multiple stimuli may be used for quick hearing assessment when time is limited. © 2008 Acoustical Society of America;
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页码：542 / 551
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