Vowel categorization by very young infants.

Abstract

Six-month-old infants are known to categorize vowels despite variation in talker voice and pitch contour. Using the observer-based psychoacoustic procedure, this study asked whether 2- and 3-month-olds could categorize similarly. Infants were trained to respond whenever the vowel category alternated from /a/ to /i/ and to refrain from responding when the vowel category remained the same, despite variation in spectral cues associated with pitch and talker changes. Eighty percent of 2-, 3-, and 6-month-olds did not respond the first time a talker change occurred in the absence of a vowel change, suggesting that even the younger infants recognize these spectrally different sounds as perceptually equivalent

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