Audiogram of the Mouse Opossum (Marmosa elegans)
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Data from: Frost, S.B., and Masterton, R.B. (1994) Hearing in primitive mammals: Monodelphis domestica and Marmosa elegans. Hearing Research, 76, 67-72.
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Absolute thresholds (in dB re 20 µN/m2) for two opossums
(designated A and B)
|
Ìý Frequency (in kHz) |
Individual Thresholds (in dB) |
Ìý Average |
|
|
A |
B |
||
|
1 |
96 |
— |
96 |
|
2 |
88 |
— |
88 |
|
4 |
62.5 |
48 |
55.5 |
|
8 |
37.5 |
39 |
38 |
|
16 |
43 |
47 |
45 |
|
32 |
31 |
35 |
33 |
|
64 |
38.5 |
40 |
39.5 |
|
75 |
48.5 |
52.5 |
50.5 |
|
85 |
75.5 |
82 |
78 |
Lowest and highest frequencies audible at sound
pressure levels (SPL) ranging from 40 to 70 dB SPL
|
SPL (in dB) |
Lowest audible frequency (in kHz) |
Highest audible frequency (in kHz) |
|
70 |
2.9 |
82 |
|
60 |
3.6 |
78 |
|
50 |
5.0 |
75 |
|
40 |
7.4 |
64 |
|
30 |
— |
— |
Additional Parameters:
Body weight = 50 g
Functional interaural distance= 60 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 graph in Frost & Masterton, 1994.