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A re-evaluation of auditory filter shape in delphinid odontocetes: Evidence of constant-bandwidth filters
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10.1121/1.3644912
/content/asa/journal/jasa/130/5/10.1121/1.3644912
http://aip.metastore.ingenta.com/content/asa/journal/jasa/130/5/10.1121/1.3644912

Figures

Image of FIG. 1.
FIG. 1.

Bottlenose Dolphin (Johnson, 1968; Au and Moore, 1990), Beluga (Johnson et al., 1989), and False Killer Whale (Thomas et al., 1990) critical ratios as a function of frequency.

Image of FIG. 2.
FIG. 2.

Electronic apparatus used for stimulus presentation.

Image of FIG. 3.
FIG. 3.

Ambient noise levels for Sea Life Park (SLP).

Image of FIG. 4.
FIG. 4.

Experimental setup.

Image of FIG. 5.
FIG. 5.

Masked and unmasked pure tone thresholds. Error bars indicate standard error values.

Image of FIG. 6.
FIG. 6.

Masking as a function of noise level. The solid line represents the mean threshold and the dotted line represents the best-fitting linear regression line.

Image of FIG. 7.
FIG. 7.

Average critical ratios as a function of frequency critical ratios were calculated by subtracting the noise power in a 1 Hz band (dB re 1 μPa2/Hz) from the signal intensity at threshold (dB re 1 μPa2) and averaged for all three masking noise levels. Error bars indicate standard error values.

Image of FIG. 8.
FIG. 8.

Average Critical Ratios as a function of frequency pooled for the Bottlenose Dolphin (Johnson, 1968 and Au and Moore, 1990) Beluga (Johnson et al., 1989), False Killer Whale (Thomas et al., 1990), Harbor porpoise (Kastelein et al., 2009) and data from the current study. The black data points and regression line are for the 0–35 kHz range (slope =0.478 ± 0.180), and the grey data points and regression line are for the 40–120 kHz range (slope = 0.121± 0.096).

Tables

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TABLE I.

Masked and unmasked pure tone thresholds in dB re 1μPa.

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TABLE II.

ANOVA summary table.

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TABLE III.

Regression slopes.

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/content/asa/journal/jasa/130/5/10.1121/1.3644912
2011-11-16
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A re-evaluation of auditory filter shape in delphinid odontocetes: Evidence of constant-bandwidth filters
http://aip.metastore.ingenta.com/content/asa/journal/jasa/130/5/10.1121/1.3644912
10.1121/1.3644912
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