Audiogram of the domestic horse (Equus caballus)
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Data from: Heffner, R., and Heffner, H. (1983) Hearing in large mammals: The horse (Equus caballus) and cattle (Bos taurus). Behavioral Neuroscience, 97, 299-309.
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Absolute thresholds (in dB re 20 µN/m2) for three horses (designated A, B, and C)
|
Ìý Frequency (in kHz) |
Individual Thresholds (in dB) |
Ìý Average |
||
|
A |
B |
C |
||
|
.0315 |
>83 |
81 |
78 |
81 |
|
.063 |
57 |
54 |
54 |
55 |
|
.125 |
44 |
44 |
47 |
45 |
|
.250 |
25 |
25 |
30 |
27 |
|
.500 |
17 |
13 |
14 |
15 |
|
1 |
6 |
9 |
11 |
9 |
|
2 |
14 |
7 |
0 |
7 |
|
4 |
16 |
19 |
13 |
16 |
|
8 |
9 |
4 |
21 |
11 |
|
16 |
17 |
3 |
10 |
10 |
|
32 |
64 |
22 |
52 |
46 |
|
35 |
90 |
32 |
90 |
70 |
|
40 |
— |
85 |
— |
— |
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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 |
.042 |
35 |
|
60 |
.055 |
33.5 |
|
50 |
.100 |
32.5 |
|
40 |
.175 |
28.5 |
|
30 |
.235 |
23.5 |
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Additional Parameters:
Body weight = 315 kg
Functional interaural distance= 684 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.