Audiogram of the chipmunk (Tamias striatus)
Ìý
Data from: : Heffner, R.S., Koay, G., and Heffner, H.E. (2001) Audiograms of five species of rodents: Implications for the evolution of hearing and the encoding of pitch. Hearing Research 157,138-152.
Ìý
Absolute thresholds (in dB re 20 µN/m2) for four chipmunks (designated A through D
|
Ìý Frequency (in kHz) |
Individual Thresholds (in dB) |
Ìý Average |
|||
|
A |
B |
C |
D |
||
|
.004 |
98 |
— |
98 |
— |
98 |
|
.008 |
86 |
— |
87 |
— |
86.5 |
|
.016 |
80 |
— |
77 |
— |
78.5 |
|
.032 |
66 |
— |
61 |
— |
63.5 |
|
.063 |
51 |
53 |
48 |
— |
50.7 |
|
.125 |
39 |
39 |
40 |
— |
39.3 |
|
.250 |
33 |
26 |
39 |
27 |
31.3 |
|
.500 |
20 |
19 |
19 |
— |
19.3 |
|
1 |
20 |
16 |
14 |
— |
16.7 |
|
2 |
32 |
29 |
23 |
— |
28 |
|
4 |
32 |
31 |
27 |
— |
30 |
|
8 |
30 |
13 |
22 |
— |
21.7 |
|
16 |
22 |
16 |
24 |
— |
20.7 |
|
32 |
24 |
24 |
24 |
— |
24 |
|
45 |
25 |
38 |
18 |
— |
27 |
|
50 |
52 |
73 |
37 |
— |
54 |
|
56 |
— |
— |
85 |
— |
85 |
|
64 |
>90 |
>90 |
>90 |
— |
>90 |
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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 |
.024 |
53 |
|
60 |
.039 |
52 |
|
50 |
.067 |
50 |
|
40 |
.121 |
48 |
|
30 |
.370 |
45.5 |
Additional Parameters:
Body weight = 90 g
Functional interaural distance= 108 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.