Audiogram of the Greater Spear-nosed bat (Phyllostomus hastatus)
Data from: Koay, G., Heffner, R.S., Bitter, K., and Heffner, H.E. (2003) Hearing in American leaf-nosed bats.I: Phyllostomus hastatus. Hearing Research 171, 96-102.
Absolute thresholds (in dB re 2 µN/m2) for two Phyllostomus hastatus
(designated A and B)
|
Frequency (in kHz) |
Individual Thresholds (in dB) |
Average |
|
|
A |
B |
||
|
1 |
88 |
77.5 |
82.75 |
|
2 |
60.5 |
51 |
55.75 |
|
4 |
34 |
29.5 |
31.75 |
|
8 |
15 |
11.5 |
13.25 |
|
12.5 |
10.25 |
7.5 |
8.88 |
|
16 |
7 |
5.5 |
6.25 |
|
20 |
0 |
2.5 |
1.25 |
|
25 |
1 |
3 |
2 |
|
32 |
2 |
4.5 |
3.25 |
|
40 |
6.5 |
8.5 |
7.5 |
|
50 |
14.5 |
15 |
14.75 |
|
56 |
|
12 |
|
|
64 |
8.5 |
9.5 |
9 |
|
71 |
|
14.5 |
|
|
80 |
17.5 |
20.75 |
19.13 |
|
90 |
|
32 |
|
|
100 |
47.75 |
52.75 |
50.25 |
|
110 |
67.5 |
70.5 |
69 |
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 |
1.37 |
111 |
|
60 |
1.77 |
105 |
|
50 |
2.35 |
100 |
|
40 |
3.13 |
93 |
|
30 |
4.2 |
87 |
Additional Parameters:
Body weight = 75 g
Functional interaural distance = 108 µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
Comments: Threshold values taken from original data.