Audiogram of the chimpanzee (Pan troglodytes)
Ìý
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)
Ìý
Average absolute thresholds (in dB re 20 µN/m2) of the two studies
|
Ìý 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 |
Ìý |
13.5 |
14 |
|
24 |
Ìý |
23.5 |
24 |
|
32 |
Ìý |
83 |
83 |
*Actual frequencies used were 128, 256, 512, 1024, 2048, 4096, and 8192 Hz
Ìý
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 |
Ìý
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.)
Ìý
Comments: Threshold values taken from graphs. Both studies used headphones.