First International Conference on Spoken Language Processing (ICSLP 90)
The basic auditory functions and the perception of vowel-like vocal sounds (grunts) were studied in the chimpanzee. The chimpanzee showed a W-shaped auditory sensitivity function. The chimpanzee was more sensitive to 1-kHz and 8-kHz than 2-kHz and 4-kHz tones. It was found that the first formant was more important than the second formant for the perception of these vocal sounds. The chimpanzee did not vocalize vowel-like sounds [i] and [el. The relationship between the perception of grunts and the auditory sensitivity function and between the perception and the production of grunts of the chimpanzee was discussed.
Bibliographic reference. Kojima, Shozo (1990): "Audition and speech perception in the chimpanzee", In ICSLP-1990, 749-752.