Audiogram of the Cynomolgus monkey (Macaca fascicularis).
Also known as the crab-eating macaque.
Previously known as the Philippine macaque (Macaca irus).
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Data from: Stebbins, W.C., Green, S., and Miller, F.L. (1966) Auditory sensitivity of the monkey. Science, 153, 1646-1647.
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Absolute thresholds (in dB re 20 µN/m2) for three cynomolgus monkeys
|
Ìý Frequency (in kHz) |
Average Threshold (in dB) |
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| Ìý | ||
|
.060 |
41 |
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|
.125 |
28 |
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|
.250 |
23 |
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|
.500 |
11 |
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|
1 |
1 |
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|
2 |
14 |
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|
4 |
19 |
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|
8 |
7 |
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|
10 |
14 |
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|
15 |
8 |
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|
20 |
27 |
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|
30 |
33 |
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|
40 |
41 |
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|
45 |
83 |
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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 |
— |
43 |
|
60 |
— |
42 |
|
50 |
— |
41 |
|
40 |
.064 |
39 |
|
30 |
.110 |
25 |
Additional Parameters:
Body weight = 9 kg
Functional interaural distance= 410 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. Tones presented via headphones.