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Naturalistic Language Input is Associated with Resting-State Functional Connectivity in Infancy
Lucy S King1, M Catalina Camacho2, David F Montez3
1Department of Psychology, Stanford University, Stanford, California 94305 lucyking@stanford.edu.
Summary
Infant language exposure impacts brain development. More caregiver conversational turns (CTs) correlate with lower posterior temporal network connectivity in infants aged 5-8 months.
Area of Science:
- Developmental Neuroscience
- Cognitive Neuroscience
- Linguistics
Background:
- Early language input quality and quantity influence infant language development.
- The relationship between early language input and preverbal brain circuitry remains unclear.
Purpose of the Study:
- Investigate the link between naturalistic language input and functional connectivity (FC) in infant language networks.
- Examine how adult words (AWs) and conversational turns (CTs) relate to brain network development.
Main Methods:
- Utilized resting-state functional magnetic resonance imaging (rsfMRI) in 5-8-month-old infants.
- Recorded naturalistic language environments using the Linguistic ENvironment Analysis (LENA) system.
- Analyzed FC within auditory cortex, left inferior frontal gyrus (IFG), and bilateral superior temporal gyrus (STG).
Main Results:
- Identified two language subnetworks: posterior temporal and frontotemporal.
- The quantity of CTs was uniquely associated with FC in these networks, independent of socioeconomic status (SES).
- Higher daily CTs were linked to lower connectivity in the posterior temporal language network.
Conclusions:
- Vocal interactions, specifically conversational turns, play a crucial role in infant language network function.
- Findings highlight the importance of interactive language input over passive exposure for early brain development.
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