Audiogram of the yellow baboon (Papio cynocephalus)
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Data from: Hienz, R.D., Turkkan, J.S., and Harris, A.H. (1982) Pure tone thresholds in the yellow baboon (Papio cynocephalus). Hearing Research, 8, 71-75.
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Average absolute thresholds (in dB re 20 µN/m2) for four yellow baboons
|
Ìý Frequency (in kHz) |
Average Threshold (in dB) |
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| Ìý | ||
|
.062 |
48 |
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|
.125 |
22 |
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|
.250 |
18 |
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|
.500 |
7 |
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|
1 |
3 |
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|
2 |
6 |
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|
4 |
3 |
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|
8 |
0 |
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|
16 |
3 |
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|
20 |
10 |
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|
32 |
23 |
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|
40 |
59 |
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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 |
— |
42* |
|
60 |
.045* |
40 |
|
50 |
.058 |
38 |
|
40 |
.077 |
36 |
|
30 |
.100 |
33.5 |
*Extrapolated value
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Additional Parameters:
Body weight = 22 kg
Functional interaural distance= 580 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 graph in Hienz, etal., 1982. Loudspeaker located directly over animal’s head.