Audiogram of the raccoon (Procyon lotor)
Data from: Wollack, C.H. (1965) Auditory thresholds in the raccoon (Procyon lotor). Journal of Auditory Research, 5, 139-144.
Absolute thresholds (in dB re 20 µN/m2) for two raccoons
(designated A and B)
|
Frequency (in kHz) |
Individual Thresholds (in dB) |
Average |
|
|
A |
B |
||
|
.100 |
38 |
45 |
42 |
|
.200 |
15 |
13 |
14 |
|
.300 |
11 |
9 |
10 |
|
.500 |
9 |
2 |
6 |
|
1 |
-15 |
-10 |
-12.5 |
|
3 |
-8 |
-11 |
-10 |
|
5 |
1 |
-14 |
-6 |
|
7 |
-6 |
-10 |
-8 |
|
10 |
-8 |
-15 |
-11.5 |
|
20 |
0 |
1 |
0 |
|
30 |
12 |
26 |
19 |
|
40 |
32 |
— |
32 |
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 |
— |
— |
|
50 |
.082 |
— |
|
40 |
.104 |
— |
|
30 |
.134 |
38 |
Additional Parameters:
Body weight = 10 kg
Functional interaural distance= 320 µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
Comments: Threshold values taken from Wollack, 1965.