Utterance-Initial Prosodic Differences Between Statements and Questions in Infant-Directed Speech

Area of Science:

• Linguistics
• Developmental Psychology
• Speech Science

Background:

• Syntactic structures of statements and questions differ across languages.
• Language learners may initially use non-syntactic cues to differentiate sentence types.
• Prosodic cues, such as intonation and rhythm, can signal grammatical information.

Purpose of the Study:

• To investigate prosodic differences between infant-directed wh-questions and statements.
• To identify potential non-syntactic cues available to infants for sentence-type discrimination.
• To explore the relationship between utterance-initial prosody and syntactic properties.

Main Methods:

• Analysis of F0, duration, and intensity of the first two words in naturalistic speech.
• Data collected from 13 mother-child dyads in the CHILDES database (Brent corpus).
• Comparison of prosodic features in wh-questions versus statements.

Main Results:

• Significant prosodic differences were observed between sentence types.
• The distinction was more pronounced when the second word was an open-class word.
• Findings suggest a link between utterance-initial prosody and syntactic information.

Conclusions:

• Infants may utilize prosodic cues in the initial part of utterances to distinguish between wh-questions and statements.
• Prosody provides a potential non-syntactic pathway for early language acquisition of sentence types.
• The study highlights the interplay of prosody and syntax in early language development.