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Phrasing in prelinguistic vocalizations

M P Lynch1, D K Oller, M L Steffens

  • 1Department of Audiology & Speech Sciences, Purdue University, West Lafayette, Indiana 47907-1353, USA.

Developmental Psychobiology
|January 1, 1995
PubMed
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Early infant vocalizations reveal foundational phrasing structures. While typically developing infants and those with Down syndrome share internal phrase organization, Down syndrome is associated with longer vocalization durations.

Area of Science:

  • Developmental Psychology
  • Linguistics
  • Speech and Language Pathology

Background:

  • Phrasing is fundamental to human communication, manifesting even in prelinguistic vocalizations.
  • Understanding the developmental origins of phrasing provides insight into early communication skills.
  • Prelinguistic vocalizations offer a window into the foundational elements of language development.

Purpose of the Study:

  • To explore the developmental roots of phrasing in nonvegetative, prelinguistic infant vocalizations.
  • To identify hierarchical structures within infant vocalizations and prelinguistic phrases.
  • To compare phrasing characteristics in typically developing infants and infants with Down syndrome.

Main Methods:

  • Adult judges analyzed infant vocalizations to identify syllables, utterances, and prelinguistic phrases.

Related Experiment Videos

  • Vocalizations were assessed for hierarchical arrangement, temporal patterning, and syllable duration.
  • Comparative analysis was conducted on vocalizations from typically developing infants and infants with Down syndrome.

    • Main Results:

    • A hierarchical structure of syllables within utterances and utterances within phrases was identified.
    • Prelinguistic phrases exhibited systematic lengthening of final syllables and stable temporal patterns.
    • Infants with Down syndrome showed similar internal phrase structure but with significantly longer durations compared to controls.

    Conclusions:

    • Relative durational characteristics of prelinguistic phrasing are stable developmental features.
    • Absolute durational characteristics of prelinguistic phrases can be affected by complex disorders like Down syndrome.
    • Findings highlight the universality of phrasing and its potential modifiability in early vocal behavior.