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Infants hear acoustic variability in speech, which aids word learning. This study quantifies talker variability in naturalistic settings, finding it similar to lab conditions that boost infant word acquisition.

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Area of Science:

  • Developmental Psychology
  • Linguistics
  • Acoustic Phonetics

Background:

  • Speech sounds vary naturally, both within and across talkers.
  • Laboratory studies suggest this variability aids infant word learning.
  • Limited data exists on naturalistic variability in infant-directed speech.

Purpose of the Study:

  • Quantify acoustic variability in naturalistic speech for infants aged 6-17 months.
  • Examine variability within and across different talkers.
  • Relate naturalistic variability to infant word learning.

Main Methods:

  • Analyzed longitudinal recordings of 44 infants' naturalistic speech input.
  • Used acoustic measurements (pitch, duration, HNR) and normalized acoustic distance.
  • Quantified variability within top talkers versus other talkers.

Main Results:

  • Pitch variability was lower for primary talkers, but overall acoustic distance was higher.
  • Acoustic variability was independent of input properties like talker count or speech proportion.
  • Observed pitch variability patterns mirrored those in lab studies promoting word learning.

Conclusions:

  • Naturalistic speech input contains acoustic variability beneficial for infant word learning.
  • Quantification of real-world variability provides a basis for understanding its role in development.
  • Findings bridge the gap between lab-based learning and everyday language acquisition.