Audiogram of the lesser bushbaby (Galago senegalensis)
Data from: : Heffner, H.E., Ravizza, R.J., and Masterton, B.(1969) Hearing in primitive mammals, IV: Bushbaby. Journal of Auditory Research, 9, 19-23.
Absolute thresholds (in dB re 20 µN/m2) for four bushbabies (designated A through D
|
Frequency (in kHz) |
Individual Thresholds (in dB) |
Average |
|||
|
A |
B |
C |
D |
||
|
.125 |
— |
51 |
— |
— |
51 |
|
.250 |
— |
40 |
47 |
44 |
44 |
|
.500 |
39 |
29 |
30 |
20 |
30 |
|
1 |
— |
29 |
28 |
37 |
31 |
|
2 |
16 |
10 |
19 |
17 |
16 |
|
4 |
-1 |
11 |
7 |
17 |
8.5 |
|
8 |
2 |
-16 |
3 |
5 |
-2 |
|
16 |
-3 |
-14 |
6 |
10 |
0 |
|
32 |
19 |
-3 |
4 |
8 |
7 |
|
64 |
— |
— |
57 |
61 |
59 |
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 |
— |
— |
|
60 |
.092* |
65 |
|
50 |
.125 |
57 |
|
40 |
.300 |
50 |
|
30 |
.500 |
44 |
*Extrapolated value
Additional Parameters:
Body weight =250 g
Functional interaural distance= 212 µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
Comments: Threshold values taken from original data. Animals A & B tested using a double grill-box avoidance test; animals C & D tested using conditioned suppression.