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Assessing vocal development in infants and toddlers.

Suneeti Nathani1, David J Ertmer, Rachel E Stark

  • 1Communication Sciences and Disorders, The University of Georgia, GA 30602, USA. snathani@uga.edu

Clinical Linguistics & Phonetics
|May 27, 2006
PubMed
Summary

This study tracked infant vocal development from birth to 20 months. Older infants showed advanced vocalizations, confirming the Stark Assessment of Early Vocal Development-Revised (SAEVD-R) as a key tool.

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Area of Science:

  • Developmental Psychology
  • Linguistics
  • Speech-Language Pathology

Background:

  • Prelinguistic vocalizations are crucial for language acquisition.
  • Understanding typical vocal development milestones is essential for early identification of potential delays.

Purpose of the Study:

  • To analyze the progression of prelinguistic vocal production in infants during their first 20 months of life.
  • To evaluate the utility of the Stark Assessment of Early Vocal Development-Revised (SAEVD-R) in tracking these developmental changes.

Main Methods:

  • Vocalizations from 30 typically developing infants (0-20 months) were categorized into 23 types.
  • These vocalizations were grouped into five developmental levels based on the SAEVD-R.
  • Age-related differences in vocalization levels were statistically analyzed.

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Main Results:

  • Infants progressed through distinct vocalization levels as they aged.
  • Levels 1-3 (Reflexive, Control of Phonation, Expansion) were dominant in younger infants (0-8 months).
  • Level 4 (Basic Canonical Syllables) emerged in older infants (9-20 months), with Level 5 (Advanced Forms) appearing significantly in the 16-20 month group.

Conclusions:

  • The SAEVD-R effectively differentiates vocal development stages in infants.
  • Vocal development follows a predictable, age-related trajectory during the first 20 months.
  • The findings support the SAEVD-R's clinical and research value for assessing prelinguistic skills.