Development of infants’ neural speech processing and its relation to later language skills: A MEG study
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Abstract
The 'sensitive period' for phonetic learning (∼6-12 months) is one of the earliest milestones in language acquisition where infants start to become specialized in processing speech sounds in their native language. In the last decade, advancements in neuroimaging technologies for infants are starting to shed light on the underlying neural mechanisms supporting this important learning period. The current study reports on a large longitudinal dataset with the aim to replicate and extend on two important questions: 1) what are the developmental changes during the 'sensitive period' for native and nonnative speech processing? 2) how does native and nonnative speech processing in infants predict later language outcomes? Fifty-four infants were recruited at 7 months of age and their neural processing of speech was measured using Magnetoencephalography (MEG). Specifically, the neural sensitivity to a native and a nonnative speech contrast was indexed by the mismatch response (MMR). They repeated the measurement again at 11 months of age and their language development was further tracked from 12 months to 30 months of age using the MacArthur-Bates Communicative Development Inventory (CDI). Using an a priori Region-of-Interest (ROI) approach, we observed significant increases for the Native MMR in the left inferior frontal region (IF) and superior temporal region (ST) from 7 to 11 months, but not for the Nonnative MMR. Complementary whole brain comparison revealed more widespread developmental changes for both contrasts. However, only individual differences in the left IF and ST for the Nonnative MMR at 11 months of age were significant predictors of individual vocabulary growth up to 30 months of age. An exploratory machine-learning based analysis further revealed that whole brain time series for both Native and Nonnative contrasts can robustly predict later outcomes, but with very different underlying spatial-temporal patterns. The current study extends our current knowledge and suggests that native and nonnative speech processing may follow different developmental trajectories and utilize different mechanisms that are relevant for later language skills.
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Research has identified MMR in the left inferior frontal region (IF) to be a key process that holds higher predictive value for later language skills.
“So far, research has identified MMR in the left inferior frontal region (IF) to be a key process that holds higher predictive value for later language skills [3,4].”
From Tracking Acquisition of Language in Kids (TALK) study protocol: A longitudinal investigation of infants at high vs. low risk for atypical speech and language development (2026) · cites this paper as [3]
Section 3.2.1 reports that nonnative MMRs in both the left IF and left ST at 11 months significantly predicted vocabulary growth from 12 to 30 months. The claim captures the left IF finding, but omits those conditions and implies a higher predictive value for left IF without establishing that it outperformed left ST. (LLM, conf=0.85)
Experimental — accuracy not yet measuredLearning outcomes from the sensitive period are reliable predictors of individual language skills later in life, such as vocabulary size and grammar skills.
“Converging evidence suggests that the learning outcomes from this period are reliable predictors of individual language skills later in life, such as vocabulary size and grammar skills [1–3].”
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- Authors
- Zhao, T. C., & Kuhl, P. K.
- Affiliations
- University of Washington (US)
- Corresponding author
- Zhao, T. Christina
- Venue
- NeuroImage
- Publisher
- Elsevier BV
- Published
- 2022-08
- Volume
- 256
- Pages
- 119242
- ISSN
- 1053-8119 (ISSN-L)
- OpenAlex
- W4225391041
- Cited by
- 32
- References
- 64
- Citations by year
- 2026: 5 · 2025: 5 · 2024: 11 · 2023: 6 · 2022: 5
- FWCI
- 10.28
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- NeuroImage (publishedVersion, cc-by-nc-nd)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- Eunice Kennedy Shriver National Institute of Child Health and Human Development (P50HD103524)
- Topics
- Social Sciences › Psychology › Developmental and Educational Psychology › Language Development and Disorders
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neurobiology of Language and Bilingualism
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Phonetics and Phonology Research
- Keywords
- mismatch response, vocabulary development, left inferior frontal gyrus, superior temporal gyrus
- MeSH terms
- Child, Preschool, Humans, Infant, Language Development, Phonetics, Speech, Speech Perception, Magnetoencephalography
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