Audiogram of the chimpanzee (Pan troglodytes)
Data from:
Elder, J.H. (1934) Auditory acuity of the chimpanzee. Journal of Comparative and Physiological Psychology, 17, 157-183. (3 animals)
Kojima, S. (1990) Comparison of auditory functions in the chimpanzee and human. Folia Primatologica, 55, 62-72. (2 animals)
Average absolute thresholds (in dB re 20 µN/m2) of the two studies
|
Frequency (in kHz) |
Elder 1934* Avg. Threshold (in dB) |
Kojima 1990 Avg. Threshold (in dB) |
Average Threshold (in dB) |
|
.125 |
30 |
49 |
40 |
|
.250 |
15 |
35 |
25 |
|
.500 |
10 |
14 |
12 |
|
1 |
-1 |
9 |
4 |
|
2 |
-2 |
17.5 |
8 |
|
4 |
8 |
23 |
16 |
|
8 |
5 |
1 |
3 |
|
16 |
|
13.5 |
14 |
|
24 |
|
23.5 |
24 |
|
32 |
|
83 |
83 |
*Actual frequencies used were 128, 256, 512, 1024, 2048, 4096, and 8192 Hz
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 |
— |
30 |
|
60 |
— |
28.5 |
|
50 |
— |
27 |
|
40 |
.125 |
26 |
|
30 |
.210 |
24.5 |
Additional Parameters:
Body weight = 50 kg
Functional interaural distance= 650 µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
Comments: Threshold values taken from graphs. Both studies used headphones.