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Underwater temporary threshold shift in pinnipeds: Effects of noise level and duration
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10.1121/1.2047128
/content/asa/journal/jasa/118/5/10.1121/1.2047128
http://aip.metastore.ingenta.com/content/asa/journal/jasa/118/5/10.1121/1.2047128
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Noise spectral density of the fatiguing stimulus, recorded from the calibration position in the test pool. The center frequency of the octave band is and the octave-band level is approximately re: .

Image of FIG. 2.
FIG. 2.

Baseline (pre-exposure), exposure, and recovery thresholds for a sea lion, a harbor seal, and an elephant seal exposed to octave-band noise centered at . The test frequency was . The values indicate statistical significance of comparisons between conditions. In all cases, exposure thresholds were significantly greater than baseline thresholds, and there was no difference between baseline and recovery thresholds. In all but one case, recovery thresholds were significantly lower than exposure thresholds. Points refer to mean thresholds obtained over multiple sessions; error bars denote standard deviations.

Image of FIG. 3.
FIG. 3.

Mean threshold shifts for three exposure levels and three exposure durations. Threshold shifts were measured at 2500 or following exposure to octave-band noise centered at . Control sequences duplicated the exposure sequences, with the exception that no noise was presented. Brackets show differences between individual groups of data. ( ; ; ; all other comparisons are not significant.)

Image of FIG. 4.
FIG. 4.

Threshold shifts at center frequency of noise band following 25 and of SL noise exposure. Points denote individual threshold shifts determined from test sequences. Open squares denote mean threshold shifts. ( ; significant.)

Image of FIG. 5.
FIG. 5.

Threshold shifts at center frequency of noise band following of exposure at SL and of exposure at SL. Points denote individual threshold shifts determined from test sequences. Open squares denote mean threshold shifts. ( significant.)

Image of FIG. 6.
FIG. 6.

Linear regression plots of TTS vs sound exposure level at center frequency of noise band for the three subjects. Line slopes, significance, and -squared values are provided in the legends. The horizontal lines are zero-shift lines provided for reference.

Image of FIG. 7.
FIG. 7.

Nonlinear regression plots of TTS vs sound exposure level at center frequency of noise band and one-half octave higher for the three subjects. See the text for an equation and significance of the model parameters. Solid curves represent exponential increase of TTS with increasing SEL. The horizontal lines are zero-shift lines. Dotted straight lines project TTS onset to linear portion of curve at higher exposure levels.

Image of FIG. 8.
FIG. 8.

Combined nonlinear regression plot of TTS vs normalized sound exposure level (referred to individual thresholds; includes half-octave data). See the text for details.

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/content/asa/journal/jasa/118/5/10.1121/1.2047128
2005-11-01
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Underwater temporary threshold shift in pinnipeds: Effects of noise level and duration
http://aip.metastore.ingenta.com/content/asa/journal/jasa/118/5/10.1121/1.2047128
10.1121/1.2047128
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