Audiogram of the cotton rat (Sigmodon hispidus)
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Data from: Heffner, H., and Masterton, R. (1980) Hearing in glires: domestic rabbit, cotton rat, feral house mouse and kangaroo rat. Journal of the Acoustic Society of America, 68, 154-1599.
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Absolute thresholds (in dB re 20 µN/m2) for three cotton rats (designated A, B, and C)
|
Ìý Frequency (in kHz) |
Individual Thresholds (in dB) |
Ìý Average |
||
|
A |
B |
C |
||
|
.500 |
80 |
80 |
79 |
80 |
|
1 |
62 |
65 |
— |
64 |
|
2 |
20 |
18 |
18 |
19 |
|
4 |
18 |
23 |
23 |
21 |
|
8 |
-8 |
-3 |
— |
-6 |
|
16 |
0 |
2 |
-2 |
0 |
|
32 |
8 |
11 |
11 |
10 |
|
64 |
34 |
35 |
— |
34 |
|
70 |
45 |
— |
— |
45 |
|
76 |
80 |
80 |
80 |
80 |
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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 |
.740 |
74 |
|
60 |
1 |
72 |
|
50 |
1.2 |
71 |
|
40 |
1.45 |
67 |
|
30 |
1.7 |
58 |
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Additional Parameters:
Body weight = 125 g
Functional interaural distance= 65 µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
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Comments: Threshold values taken from original data.