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Related Experiment Video

Updated: Jun 11, 2025

Infant Auditory Processing and Event-related Brain Oscillations

Infant Auditory Processing and Event-related Brain Oscillations

Published on: July 1, 2015

Functional Brain Adaptations During Speech Processing in 4-Month-Old Bilingual Infants.

Borja Blanco^1,2, Monika Molnar³, Irene Arrieta²

¹Department of Psychology, University of Cambridge, Cambridge, UK.

Developmental Science

|September 28, 2024

Summary

Early bilingualism shapes infant brains. Four-month-old bilingual infants show different neural responses to speech compared to monolingual infants, indicating early brain adaptation to language exposure.

Keywords:

bilingualism fNIRS functional brain adaptations infants speech processing

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Area of Science:

Neuroscience
Developmental Psychology
Linguistics

Background:

Language acquisition is shaped by neural development and environmental factors.
Early language exposure is crucial for cognitive development.
Bilingualism represents a significant environmental factor influencing early brain development.

Purpose of the Study:

To investigate the neural mechanisms of speech processing in infants exposed to bilingual environments.
To examine how early bilingual experience influences brain activity in 4-month-old infants.
To compare the neural responses to speech in bilingual and monolingual infants.

Main Methods:

Utilized functional near-infrared spectroscopy (fNIRS) to measure brain activity.
Compared brain responses of 4-month-old Spanish-Basque bilingual and Spanish monolingual infants.
Analyzed neural responses to forward (FW) and backward (BW) Spanish speech stimuli.

Main Results:

Bilingual infants exhibited increased engagement of bilateral inferior frontal and temporal regions during speech processing.
Monolingual infants showed left-hemispheric functional specialization for speech processing.
Distinct neural signatures of bilingual adaptation were identified in infants as young as 4 months.

Conclusions:

Early bilingual experience induces significant brain adaptations in speech processing.
Infants demonstrate neural plasticity in response to bilingual language exposure.
Language environment profoundly influences the developing brain from a very young age.