Department of Psychology

Audiogram of the yellow baboon (Papio cynocephalus)

 

Data from: Hienz, R.D., Turkkan, J.S., and Harris, A.H. (1982) Pure tone thresholds in the yellow baboon (Papio cynocephalus). Hearing Research, 8, 71-75.

 

Average absolute thresholds (in dB re 20 µN/m2) for four yellow baboons

 

Frequency

(in kHz)

Average Threshold

(in dB)

 
 

.062

48

 

.125

22

 

.250

18

 

.500

7

 

1

3

 

2

6

 

4

3

 

8

0

 

16

3

 

20

10

 

32

23

 

40

59

 

 

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

42*

60

.045*

40

50

.058

38

40

.077

36

30

.100

33.5

*Extrapolated value

 

Additional Parameters:

Body weight = 22 kg

Functional interaural distance= 580 µs

(Time required for sound to travel around the head from one auditory meatus to the other.)

 

Comments: Threshold values taken from graph in Hienz, etal., 1982. Loudspeaker located directly over animal’s head.

Last Updated: 6/27/22