Sound symbolism scaffolds language development in preverbal infants

Michiko Asano, Mutsumi Imai, Sotaro Kita, Keiichi Kitajo, Hiroyuki Okada, Guillaume Thierry

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

A fundamental question in language development is how infants start to assign meaning to words. Here, using three Electroencephalogram (EEG)-based measures of brain activity, we establish that preverbal 11-month-old infants are sensitive to the non-arbitrary correspondences between language sounds and concepts, that is, to sound symbolism. In each trial, infant participants were presented with a visual stimulus (e.g., a round shape) followed by a novel spoken word that either sound-symbolically matched ("moma") or mismatched ("kipi") the shape. Amplitude increase in the gamma band showed perceptual integration of visual and auditory stimuli in the match condition within 300msec of word onset. Furthermore, phase synchronization between electrodes at around 400msec revealed intensified large-scale, left-hemispheric communication between brain regions in the mismatch condition as compared to the match condition, indicating heightened processing effort when integration was more demanding. Finally, event-related brain potentials showed an increased adult-like N400 response - an index of semantic integration difficulty - in the mismatch as compared to the match condition. Together, these findings suggest that 11-month-old infants spontaneously map auditory language onto visual experience by recruiting a cross-modal perceptual processing system and a nascent semantic network within the first year of life.

Original languageEnglish
Pages (from-to)196-205
Number of pages10
JournalCortex
Volume63
DOIs
Publication statusPublished - 2015 May 1

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Keywords

  • Amplitude change analysis of EEG
  • Audio-visual correspondences
  • Language development
  • Phase synchronization analysis of EEG
  • Sound symbolism

ASJC Scopus subject areas

  • Neuropsychology and Physiological Psychology
  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience

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