Audiogram of the Cynomolgus monkey (Macaca fascicularis).
Also known as the crab-eating macaque.
Previously known as the Philippine macaque (Macaca irus).
Data from: Stebbins, W.C., Green, S., and Miller, F.L. (1966) Auditory sensitivity of the monkey. Science, 153, 1646-1647.
Absolute thresholds (in dB re 20 µN/m2) for three cynomolgus monkeys
|
Frequency (in kHz) |
Average Threshold (in dB) |
|
|
.060 |
41 |
|
|
.125 |
28 |
|
|
.250 |
23 |
|
|
.500 |
11 |
|
|
1 |
1 |
|
|
2 |
14 |
|
|
4 |
19 |
|
|
8 |
7 |
|
|
10 |
14 |
|
|
15 |
8 |
|
|
20 |
27 |
|
|
30 |
33 |
|
|
40 |
41 |
|
|
45 |
83 |
|
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.)
Comments: Threshold values taken from graph. Tones presented via headphones.