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Voco‐auditory functions of the chimpanzee

Auditory sensitivity, frequency, and intensity difference thresholds were measured in chimpanzees. Chimpanzees had a W‐shaped auditory sensitivity function. That is, they were less sensitive to the midfrequency range of 2–4 kHz than to 1–8 kHz (the best frequencies). The frequency and intensity difference thresholds at 1 kHz and 70 dB SPL were about 10 Hz and about 1.5 dB, respectively. In the perception of vowels, reaction time for vowel discrimination was longer for [i]‐[u] and [e]‐[o] pairs than for other vowel pairs. This vowel perception can be explained by the W‐shaped auditory sensitivity function. In the perception of stop consonants, distinction of the place feature was more difficult than that of the voicing feature. Preliminary experiments indicated that chimpanzees show vocal tract normalization effects for vowels and phoneme boundary effects for stop consonants.