Audiogram of the pocket gopher (Geomys bursarius)
Data from: Heffner, R.S., and Heffner, H.E. (1990) Vestigial hearing in a fossorial mammal, the pocket gopher, (Geomys bursarius).Hearing Research, 46, 239-252.
Absolute thresholds (in dB re 20 µN/m2) for four pocket gophers (designated A through D
|
Frequency (in kHz) |
Individual Thresholds (in dB) |
Average |
|||
|
A |
B |
C |
D |
||
|
.0315 |
>88 |
|
|
||
|
.045 |
>85 |
85 |
>85 |
||
|
.063 |
89 |
83 |
86 |
||
|
.125 |
87 |
64 |
76 |
||
|
.250 |
62 |
62 |
62 |
||
|
.500 |
42 |
47 |
45 |
||
|
1 |
47 |
38 |
43 |
||
|
2 |
28 |
20 |
|
23 |
24 |
|
4 |
36 |
|
38 |
33 |
36 |
|
8 |
58 |
58 |
58 |
||
|
16 |
81 |
67 |
75 |
74 |
|
|
32 |
88 |
|
79 |
84 |
|
|
45 |
>89 |
|
>89 |
>89 |
|
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 |
.170 |
13.7 |
|
60 |
.270 |
8.7 |
|
50 |
.410 |
6.2 |
|
40 |
1.1 |
4.5 |
|
30 |
1.6 |
2.8 |
Additional Parameters:
Body weight = 175 g
Functional interaural distance= 111 µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
Comments: Threshold values taken from original data.