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By 4.5 Months, Linguistic Experience Already Affects Infants' Talker Processing Abilities.

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Summary

Infants as young as 4-5 months can distinguish talkers in a familiar language, showing that integrated speech processing develops early. This ability is language-specific, emerging with language experience.

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Area of Science:

  • Developmental Psychology
  • Auditory Perception
  • Linguistics

Background:

  • Adult speech perception models highlight interdependent processing of linguistic and nonlinguistic speech features.
  • The developmental emergence of this integrated processing remains largely unexplored.

Purpose of the Study:

  • To investigate the developmental onset of integrated linguistic and nonlinguistic speech processing in infants.
  • To determine if language experience influences the ability to distinguish between talkers.

Main Methods:

  • 96 infants aged 4-5 months were tested on talker identification.
  • Stimuli included talkers speaking a familiar language (English) and unfamiliar languages (Polish, Spanish).

Main Results:

  • Infants successfully distinguished talkers in the familiar English language.
  • Infants did not distinguish talkers in the unfamiliar Polish or Spanish languages.

Conclusions:

  • The integrated processing of linguistic and nonlinguistic speech information is an early-emerging ability in human infants.
  • Early language experience shapes the development of robust speech perception, including talker identification.