Auditory evoked potential (AEP) data are commonly obtained in air while sea lions are under gas anesthesia; a procedure that precludes the measurement of underwater hearing sensitivity. This is a substantial limitation considering the importance of underwater hearing data in designing criteria aimed at mitigating the effects of anthropogenic noise exposure. To determine if some aspects of underwater hearing sensitivity can be predicted using rapid aerial AEP methods, this study measured underwater psychophysical thresholds for a young male California sea lion (Zalophus californianus) for which previously published aerial AEP thresholds exist. Underwater thresholds were measured in an aboveground pool at frequencies between 1 and 38 kHz. The underwater audiogram was very similar to those previously published for California sea lions, suggesting that the current and previously obtained psychophysical data are representative for this species. The psychophysical and previously measured AEP audiograms were most similar in terms of high-frequency hearing limit (HFHL), although the underwater HFHL was sharper and occurred at a higher frequency. Aerial AEP methods are useful for predicting reductions in the HFHL that are potentially independent of the testing medium, such as those due to age-related sensorineural hearing loss.
REFERENCES
1.
Babushina
, E. S.
, Zaslavsky
, G. L.
, and Yurkevich
, L. I.
(1991
). “Air and underwater hearing of the northern fur seal–audiograms and auditory frequency discrimination
,” Biophysics (Engl. Transl.)
36
, 904
–907
.2.
Cornsweet
, T. N.
(1962
). “The staircase method in psychophysics
,” Am. J. Psychol.
75
, 485
–491
.3.
Finneran
, J. J.
(2003
). “An integrated computer-controlled system for marine mammal auditory testing
” (SSC San Diego, San Diego, CA), p. 102
.4.
Finneran
, J. J.
, Carder
, D. A.
, Schlundt
, C. E.
, and Dear
, R. L.
(2010
). “Growth and recovery of temporary threshold shift (TTS) at 3 kHz in bottlenose dolphins (Tursiops truncatus)
,” J. Acoust. Soc. Am.
127
, 3256
–3266
.5.
Finneran
, J. J.
, Carder
, D. A.
, Schlundt
, C. E.
, and Ridgway
, S. H.
(2005
). “Temporary threshold shift (TTS) in bottlenose dolphins (Tursiops truncatus) exposed to mid-frequency tones
,” J. Acoust. Soc. Am.
118
, 2696
–2705
.6.
Finneran
, J. J.
, Houser
, D. S.
, Mase-Guthrie
, B.
, Ewing
, R. Y.
, and Lingenfelser
, R. G.
(2009
). “Auditory evoked potentials in a stranded Gervais’ beaked whale (Mesoplodon europaeus)
,” J. Acoust. Soc. Am.
126
, 484
–490
.7.
Finneran
, J. J.
, and Schlundt
, C. E.
(2007
). “Underwater sound pressure variation and bottlenose dolphin (Tursiops truncatus) hearing thresholds in a small pool
,” J. Acoust. Soc. Am.
122
, 606
–614
.8.
Hemilä
, S.
, Nummela
, S.
, Berta
, A.
, and Reuter
, T.
(2006
). “High-frequency hearing in phocid and otariid pinnipeds: An interpretation based on inertial and cochlear constraints (L)
,” J. Acoust. Soc. Am.
120
, 3463
–3466
.9.
Houser
, D. S.
, Gomez-Rubio
, A.
, and Finneran
, J. J.
(2008
). “Evoked potential audiometry of 13 Pacific bottlenose dolphins (Tursiops truncatus gilli)
,” Marine Mammal Sci.
24
, 28
–41
.10.
Kastelein
, R. A.
, Mosterd
, P.
, van Santen
, B.
, and Hagedoorn
, M.
(2002
). “Underwater audiogram of a Pacific walrus (Odobenus rosmarus divergens) measured with narrow-band frequency-modulated signals
,” J. Acoust. Soc. Am.
112
, 2173
–2182
.11.
Kastelein
, R. A.
, van Schie
, R.
, Verboom
, W. C.
, and de Haan
, D.
(2005
). “Underwater hearing sensitivity of a male and a female Steller sea lion (Eumetopias jubatus)
,” J. Acoust. Soc. Am.
118
, 1820
–1829
.12.
Kastelein
, R. A.
, Wensveen
, P. J.
, Hoek
, L.
, Verboom
, W. C.
, and Terhune
, J. M.
(2009
). “Underwater detection of tonal signals between 0.125 and 100 kHz by harbor seals (Phoca vitulina)
,” J. Acoust. Soc. Am.
125
, 1222
–1229
.13.
Klishin
, V. O.
, Diaz
, R. P.
, Popov
, V. V.
, and Supin
, A. Y.
(1990
). “Some characteristics of hearing of the Brazilian manatee, Trichechus inunguis
,” Aquat. Mamm.
16
, 139
–144
.14.
Levitt
, H.
(1971
). “Transformed up-down methods in psychoacoustics
,” J. Acoust. Soc. Am.
49
, 467
–477
.15.
Moore
, P. W. B.
, and Schusterman
, R. J.
(1987
). “Audiometric assessment of northern fur seals, Callorhinus ursinus
,” Marine Mammal Sci.
3
, 31
–53
.16.
Mulsow
, J.
, Reichmuth
, C.
, Gulland
, F. M. D.
, Rosen
, D. A. S.
, and Finneran
, J. J.
(2011a
). “Aerial audiograms of several California sea lions (Zalophus californianus) and Steller sea lions (Eumetopias jubatus) measured using single and multiple simultaneous auditory steady-state response methods
,” J. Exp. Biol.
214
, 1138
–1147
.17.
Mulsow
, J. L.
, Finneran
, J. J.
, and Houser
, D. S.
(2011b
). “California sea lion (Zalophus californianus) aerial hearing sensitivity measured using auditory steady-state response and psychophysical methods
,” J. Acoust. Soc. Am.
129
, 2298
–2306
.18.
Mulsow
, J. L.
, and Reichmuth
, C.
(2010
). “Psychophysical and electrophysiological aerial audiograms of a Steller sea lion (Eumetopias jubatus)
,” J. Acoust. Soc. Am.
127
, 2692
–2701
.19.
Nachtigall
, P. E.
, Supin
, A. Y.
, Amundin
, M.
, Roken
, B.
, Møller
, T.
, Mooney
, T. A.
, Taylor
, K. A.
, and Yuen
, M.
(2007
). “Polar bear Ursus maritimus hearing measured with auditory evoked potentials
,” J. Exp. Biol.
210
, 1116
–1122
.20.
National Research Council (NRC)
. (2005
). Marine Mammal Populations and Ocean Noise
(National Academies Press
, Washington, DC
), p. 126
.21.
Picton
, T. W.
, John
, M. S.
, Dimitrijevic
, A.
, and Purcell
, D.
(2003
). “Human auditory steady-state responses
,” Int. J. Audiol.
42
, 177
–219
.22.
Popov
, V. V.
, and Supin
, A. Y.
(1990
). “Auditory brainstem responses in characterization of dolphin hearing
,” J. Comp. Physiol., A
166
, 385
–393
.23.
Popov
, V. V.
, Supin
, A. Y.
, Pletenko
, M. G.
, Tarakanov
, M. B.
, Klishin
, V. O.
, Bulgakova
, T. N.
, and Rosanova
, E. I.
(2007
). “Audiogram variability in normal bottlenose dolphins (Tursiops truncatus)
,” Aquat. Mamm.
33
, 24
–33
.24.
Reichmuth
, C.
, Mulsow
, J.
, Finneran
, J. J.
, Houser
, D. S.
, and Supin
, A. Y.
(2007
). “Measurement and response characteristics of auditory brainstem responses in pinnipeds
,” Aquat. Mamm.
33
, 132
–150
.25.
Reichmuth
, C.
, and Southall
, B.
(2011
). “Underwater hearing in California sea lions (Zalophus californianus): Expansion and interpretation of existing data
,” Marine Mammal Sci. Advance online publication. DOI: .26.
Richardson
, W. J.
, Greene
, C. R.
, Jr., Malme
, C. I.
, and Thomson
, D. H.
(1995
). Marine Mammals and Noise
(Academic Press
, San Diego
), p. 576
.27.
Schusterman
, R. J.
, Balliet
, R. F.
, and Nixon
, J.
(1972
). “Underwater audiogram of the California sea lion by the conditioned vocalization technique
,” J. Exp. Anal. Behav.
17
, 339
–350
.28.
Schusterman
, R. J.
, Southall
, B.
, Kastak
, D.
, and Kastak
, C. R.
(2002
). “Age-related hearing loss in sea lions and their scientists (A)
,” J. Acoust. Soc. Am.
111
, 2342
–2343
.29.
Southall
, B. L.
, Bowles
, A. E.
, Ellison
, W. T.
, Finneran
, J. J.
, Gentry
, R. L.
, Greene
, C. R.
, Jr., Kastak
, D.
, Ketten
, D. R.
, Miller
, J. H.
, Nachtigall
, P. E.
, Richardson
, W. J.
, Thomas
, J. A.
, and Tyack
, P. L.
(2007
). “Marine mammal noise exposure criteria: initial scientific recommendations
,” Aquat. Mamm.
33
, 411
–521
.30.
Southall
, B. L.
, Schusterman
, R. J.
, and Kastak
, D.
(2000
). “Masking in three pinnipeds: underwater, low-frequency critical ratios
,” J. Acoust. Soc. Am.
108
, 1322
–1326
.31.
Southall
, B. L.
, Schusterman
, R. J.
, and Kastak
, D.
(2003
). “Auditory masking in three pinnipeds: Aerial critical ratios and direct critical bandwidth measurements
,” J. Acoust. Soc. Am.
114
, 1660
–1666
.32.
Supin
, A. Y.
, Popov
, V. V.
, and Mass
, A. M.
(2001
). The Sensory Physiology of Aquatic Mammals
(Kluwer Academic Publishers
, Boston
), p. © 2012 Acoustical Society of America.
2012
Acoustical Society of America
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