Audiogram of the slow loris (Nycticebus coucang)
Data from: Heffner, H., and Masterton, B. (Hearing in primitive primates: Slow loris (Nycticebus coucang) and potto (perodicticus potto). Journal of Comparative and Physiological Psychology, 71, 175-182.
Absolute thresholds (in dB re 20 µN/m2) for two slow lorises
(designated A and B)
|
Frequency (in kHz) |
Individual Thresholds (in dB) |
Average |
|
|
A |
B |
||
|
.063 |
69 |
66 |
68 |
|
.125 |
46 |
51 |
48 |
|
.250 |
34 |
39 |
37 |
|
.500 |
25 |
34 |
30 |
|
1 |
24 |
23 |
24 |
|
2 |
20 |
28 |
24 |
|
4 |
23 |
24 |
24 |
|
8 |
25 |
6 |
16 |
|
16 |
14 |
4 |
9 |
|
32 |
32 |
16 |
24 |
|
38 |
63 |
— |
63 |
|
42 |
69 |
— |
69 |
|
50 |
— |
70 |
70 |
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 |
.060 |
47 |
|
60 |
.083 |
43 |
|
50 |
.120 |
40 |
|
40 |
.220 |
36 |
|
30 |
.500 |
34 |
Additional Parameters:
Body weight = 1 kg
Functional interaural distance= 218 µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
Comments: Threshold values taken from original data.