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Infant Auditory Processing and Event-related Brain Oscillations
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An auditory perspective on phonological development in infancy.

Monica Hegde1, Thierry Nazzi1, Laurianne Cabrera1

  • 1Integrative Neuroscience and Cognition Center (INCC-UMR 8002), Université Paris Cité-CNRS, Paris, France.

Frontiers in Psychology
|February 8, 2024
PubMed
Summary
This summary is machine-generated.

Infants aged 6-10 months show developing speech perception, with 10-month-olds more affected by degraded auditory cues for consonants than 6-month-olds. This highlights changes in how infants process speech sounds over time.

Keywords:
amplitude modulationsfrequency modulationsinfantsphonetic processingspeech perceptual attunementvocoder

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Area of Science:

  • Auditory perception
  • Speech processing
  • Developmental psychology

Background:

  • The auditory system processes speech via spectro-temporal modulations, including amplitude variations (AM) and frequency modulations (FM).
  • Adults rely on slow AM cues (<8-16 Hz) for speech, while infants also need faster AM cues (>8-16 Hz).

Purpose of the Study:

  • To investigate how typical-hearing infants (6 and 10 months) and adults perceive phonetic features under degraded auditory conditions.
  • To determine the developmental changes in auditory cue weighting for speech perception between 6 and 10 months of age.

Main Methods:

  • A psychophysical method was used to test phoneme categorization in consonant-vowel syllables.
  • Auditory conditions involved degraded frequency modulation (FM) cues and amplitude modulation (AM) cues at fast (>8 Hz) and slow (<8 Hz) rates.

Main Results:

  • Infants and adults could categorize phonemes with degraded FM and fast AM cues, but performance decreased with slow AM cues.
  • Vowel categorization showed age-related differences, with adults outperforming both infant groups.
  • Consonant categorization revealed that 10-month-olds were more affected by temporal degradation than 6-month-olds.

Conclusions:

  • Degradation of FM and faster AM cues significantly impacts consonant processing in 10-month-old infants.
  • Between 6 and 10 months, infants exhibit distinct developmental shifts in processing speech temporal cues for vowels versus consonants, potentially related to phonological development.