Audiogram of the Indian elephant (Elephas maximus)
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Data from: Heffner, R.S., and Heffner, H.E. (1982) Hearing in the elephant: Absolute thresholds, frequency discrimination, and sound localization. Journal of Comparative and Physiological Psychology, 96, 926-944.
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Absolute thresholds (in dB re 20 µN/m2) for an Indian elephant
|
Ìý Frequency (in kHz) |
Average Threshold (in dB) |
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| Ìý | ||
|
.016 |
65 |
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|
.020 |
52.5 |
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|
.0315 |
43.5 |
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|
.063 |
38.5 |
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|
.125 |
36.5 |
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|
.250 |
24.5 |
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|
.500 |
24 |
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|
1 |
8 |
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|
2 |
19 |
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|
4 |
23 |
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|
8 |
42 |
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|
10 |
55.5 |
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|
12 |
72 |
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|
14 |
79 |
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Lowest and highest frequencies audible at sound
pressure levels (SPL) ranging from 30 to 70 dB SPL
|
SPL (in dB) |
Lowest audible frequency (in kHz) |
Highest audible frequency (in kHz) |
|
70 |
.0145 |
11.8 |
|
60 |
.017 |
10.5 |
|
50 |
.0225 |
9.2 |
|
40 |
.050 |
7.5 |
|
30 |
.180 |
4.2 |
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Additional Parameters:
Body weight = 3000 kg
Functional interaural distance= 3350 µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
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Comments: Threshold values taken from original data.