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September 2021

Is infant-directed speech prosody a result of the vocal expression of emotion?

Author(s): Austin, C. M., Desjardins, R. N.

Journal/Book: Psychol Sci. 2000; 11: 350 Main Street, Ste 6, Malden, MA 02148, USA. Blackwell Publishers. 188-195.

Abstract: Many studies have found that infant-directed (ID) speech has higher pitch, has more exaggerated pitch contours, has a larger pitch range, has a slower tempo, and is more rhythmic than typical adult-directed (AD) speech. We show that the ID speech style reflects free vocal expression of emotion to infants, in comparison with more inhibited expression of emotion in typical AD speech. When AD speech does express emotion, the same acoustic features are used as in ID speech. We recorded ID and AD samples of speech expressing love-comfort, fear, and surprise. The emotions were equally discriminable in the ID and AD samples. Acoustic analyses showed few differences between the ID and AD samples, but robust differences across the emotions. We conclude that ID prosody itself is not special. What is special is the widespread expression of emotion to infants in comparison with the more inhibited expression of emotion in typical adult interactions.

Note: Article Trainor LJ, McMaster Univ, Dept Psychol, Hamilton, ON L8S 4K1, CANADA

Keyword(s): MATERNAL SPEECH; LANGUAGE; INTONATION; MOTHERESE; FEATURES; RESPONSIVENESS; PREFERENCES; LULLABIES; CONTOURS; TALK


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