Audiogram of the owl monkey (Aotus trivirgatus)
Data from: Beecher, M.D. (1974) Hearing in the owl monkey (aotus trivirgatus). Journal of Comparative and Physiological Psychology, 86, 898-901.
Absolute thresholds (in dB re 20 µN/m2) for two owl monkeys (designated A and B)
|
Frequency (in kHz) |
Individual Thresholds (in dB) |
Average |
|
|
A |
B |
||
|
.125 |
40 |
38 |
39 |
|
.250 |
23 |
25 |
24 |
|
.500 |
11 |
— |
11 |
|
1 |
7 |
7 |
7 |
|
2 |
6 |
4 |
5 |
|
4 |
12 |
12 |
12 |
|
8 |
-6 |
-8 |
-7 |
|
10 |
-9 |
-7 |
-8 |
|
16 |
3 |
7 |
5 |
|
20 |
7 |
7 |
7 |
|
32 |
14 |
17 |
16 |
|
40 |
25 |
28 |
26 |
|
48 |
54 |
54 |
54 |
|
50 |
63 |
67 |
65 |
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 |
— |
51* |
|
60 |
— |
49.5 |
|
50 |
85* |
47 |
|
40 |
120 |
44 |
|
30 |
205 |
45 |
*Extrapolated value
Additional Parameters:
Body weight = 800 g
Functional interaural distance= 225 µs (estimated)
(Time required for sound to travel around the head from one auditory meatus to the other.)
Comments: Threshold values taken from Beecher, 1974.