Neural Development of Speech Sensorimotor Learning.

Area of Science:

• Neuroscience
• Developmental Psychology
• Speech Science

Background:

• Human brain development extends into early adulthood, involving significant cortical plasticity.
• Cortical plasticity during development is thought to shape associative transmodal brain regions.
• Understanding this plasticity is key to explaining coordinated brain activity for speech motor learning.

Purpose of the Study:

• To investigate how cortical plasticity influences speech motor learning.
• To examine functional connectivity (FC) patterns related to speech audio-motor adaptation in children and adults.
• To identify age-related differences in brain network engagement during speech learning.

Main Methods:

• Assessed brain functional connectivity (FC) in children (5-12 years) and young adults.
• Correlated FC strength with speech audio-motor adaptation capacity.
• Compared learning-associated FC patterns between age groups.

Main Results:

• Children and adults exhibited distinct patterns of learning-related brain activity.
• Adult speech learning correlated with connectivity in transmodal regions integrating auditory and somatosensory information.
• Children's speech learning relied more on basic somatosensory and motor circuits.

Conclusions:

• Speech motor adaptation abilities develop through cortical remodeling, observable from late childhood into adulthood.
• A shift towards reliance on transmodal regions for speech learning occurs with maturation.
• Findings offer insights into speech biology and neural mechanisms of multisensory integration in motor learning.