Audiogram of the grey short-tailed opossum (Monodelphis domestica)
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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 five short-tailed opossums
(designated A through E)
|
Frequency (in kHz) |
Individual Thresholds (in dB) |
Average |
||||
|
A |
B |
C |
D |
E |
||
|
1 |
94 |
96 |
— |
— |
— |
95 |
|
2 |
55 |
75 |
77 |
76 |
— |
71 |
|
4 |
50 |
56 |
55.5 |
56 |
— |
54.5 |
|
8 |
19 |
27 |
22.5 |
25 |
25 |
23.5 |
|
16 |
36 |
31 |
16 |
17 |
15 |
23 |
|
32 |
36 |
35 |
29.5 |
30 |
29 |
32 |
|
64 |
30 |
35 |
30 |
28 |
26.5 |
30 |
|
75 |
63 |
70 |
40 |
52.5 |
54 |
56 |
|
85 |
85 |
88 |
— |
— |
— |
86.5 |
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 |
2.05 |
78 |
|
60 |
3.15 |
76 |
|
50 |
4.4 |
72 |
|
40 |
5.6 |
68 |
|
30 |
6.9 |
54 |
Additional Parameters:
Body weight =90 g
Functional interaural distance= 114 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 Frost and Masterton,1994.
For another audiogram, see: Reimer, K., and Bauman, S. (1995) Behavioral audiogram of the Brazilian grey short tailed opossum, Monodelphis domestica (Metatheria, Didelphidae). Zoology, 99, 121-127.