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An automated classifier for child-directed speech (CDS) successfully tracked the impact of a parent coaching intervention, showing increased CDS-Proportion without manual annotation. This advancement enhances the scalability of language interventions for infants.

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Area of Science:

  • Developmental Psychology
  • Computational Linguistics
  • Speech-Language Pathology

Background:

  • Parental language input significantly influences child language development.
  • Parentese, a form of child-directed speech (CDS), is linked to enhanced infant language outcomes.
  • Previous interventions relied on manual annotation of parentese, limiting scalability.

Purpose of the Study:

  • To evaluate an automated child-directed speech (CDS) classifier's ability to detect intervention effects without human annotation.
  • To assess the utility of a novel variable, Proportion of CDS (CDS-Proportion), in capturing intervention outcomes.
  • To explore the relationship between CDS-Proportion changes and infant language achievement.

Main Methods:

  • Re-analyzed daylong recordings from a parent coaching randomized control trial (Parentese-RCT) using a newly developed CDS classifier.
  • Calculated CDS-Proportion (Proportion of CDS relative to all adult speech) for 70 children at ages 6, 10, 14, and 18 months.
  • Excluded periods of sleep from the analysis.

Main Results:

  • The intervention group showed a significant enhancement in CDS-Proportion, mirroring findings for parentese in the original study.
  • The CDS classifier captured the intervention's effect without requiring manual identification of parentese.
  • Changes in CDS-Proportion over time were positively correlated with infants' word use at 18 months.

Conclusions:

  • An automated CDS classifier and the CDS-Proportion variable offer a scalable method for evaluating language interventions.
  • Novel technologies can overcome the limitations of manual annotation in analyzing daylong recordings for intervention research.
  • This approach holds promise for advancing parent coaching interventions focused on promoting early language development.