Audiogram of the De Brazza’s monkey (Cercopithecus neglectus)
Data from: Owren, M.J., Hopp, S.L., Sinnott, J.M., and Petersen, M.R. (1988) Absolute auditory thresholds in three old world monkey species (Cercopithecus aethiops, C. neglectus, Macaca fuscata)and humans (Homo sapiens). Journal of Comparative Psychology, 102, 99-107.
Average absolute thresholds (in dB re 20 µN/m2) for five de Brazza monkeys
|
Frequency (in kHz) |
Average Threshold (in dB) |
|
|
.063 |
59 |
|
|
.088 |
55 |
|
|
.125 |
43 |
|
|
.176 |
34 |
|
|
.250 |
27 |
|
|
.353 |
16 |
|
|
.500 |
11 |
|
|
.707 |
7 |
|
|
1 |
4 |
|
|
1.4 |
3 |
|
|
2 |
15 |
|
|
2.8 |
12 |
|
|
4 |
9 |
|
|
5.7 |
2 |
|
|
8 |
4 |
|
|
11.3 |
7 |
|
|
16 |
6 |
|
|
22.6 |
18 |
|
|
32 |
22 |
|
|
34.9 |
24 |
|
|
38 |
29 |
|
|
40 |
47 |
|
|
42 |
57 |
|
|
45 |
>72 |
|
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 |
.056* |
43 |
|
60 |
.063 |
43 |
|
50 |
.100 |
40 |
|
40 |
.140 |
39 |
|
30 |
.215 |
38.1 |
*Extrapolated value
Additional Parameters:
Body weight = 7 kg
Functional interaural distance= (420) µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
Comments: Threshold values taken from table in Owren et al.,1988. Tones were presented via headphones.