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Experience is Instrumental in Tuning a Link Between Language and Cognition: Evidence from 6- to 7- Month-Old Infants' Object Categorization
Published on: April 19, 2017
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Cortical specialization associated with native speech category acquisition in early infancy
Jie Ren1, Lin Cai2, Gaoding Jia3
1Longy School of Music of Bard College, 27 Garden Street, Cambridge, MA 02138, United States.
Cerebral Cortex (New York, N.Y. : 1991)
|April 3, 2024
Summary
Infants learning Mandarin show improved tone discrimination with age. Their brains, particularly frontal regions, develop abstract speech representations and lateralization, mirroring adult patterns during this critical language learning period.
Area of Science:
- Neuroscience
- Developmental Psychology
- Linguistics
Background:
- Infant speech perception is crucial for language acquisition.
- Understanding neural mechanisms of native language specialization in infants is key.
- Mandarin Chinese, a tonal language, provides a unique model for studying tone processing.
Purpose of the Study:
- To investigate age-related changes in neural processing of Mandarin tones in infants.
- To examine the role of inferior frontal regions in abstract speech category representation.
- To explore hemispheric lateralization patterns during tonal processing in early development.
Main Methods:
- Functional near-infrared spectroscopy (fNIRS) was used to measure brain activity.
- A block design paradigm presented four Mandarin tones via syllable [ta].
- Participants included 2- to 6-month-old Mandarin-learning infants.
Main Results:
- Significant age-related improvements in tone discrimination were observed.
- Older infants showed increased involvement of frontal regions, suggesting developing abstract tonal representations.
- Brain activation patterns became more bilateral in older infants, resembling those of adult Mandarin speakers.
Conclusions:
- Early exposure to a tonal language shapes infant neural development.
- The developing brain demonstrates increasing specialization for native language features.
- Findings highlight the critical period for speech acquisition and neural plasticity.
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