Gray matter increase induced by practice correlates with task-specific activation: a combined functional and...

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Neuroimaging

Background:

• The neurophysiological mechanisms underlying practice-induced gray matter changes remain largely unknown.
• Understanding these changes is crucial for comprehending brain plasticity and learning.

Purpose of the Study:

• To investigate the relationship between practice-induced gray matter alterations and neural activation patterns.
• To explore the effects of mirror reading practice on brain structure and function.

Main Methods:

• A longitudinal study combining functional magnetic resonance imaging (fMRI) and voxel-based morphometry (VBM).
• Participants underwent MRI scans before and after a 2-week mirror reading training period.
• Analysis focused on changes in neural activation and gray matter volume.

Main Results:

• Mirror reading activated specific brain regions, including the occipital cortex, parietal cortex, prefrontal cortex, insula, and cerebellum.
• After practice, reduced activation was observed in the right superior parietal cortex, while activation increased in the right dorsal occipital cortex.
• Voxel-based morphometry revealed an increase in gray matter in the right dorsolateral occipital cortex, correlating with task-specific activation.

Conclusions:

• Short-term increases in gray matter signal observed via MRI reflect task-specific processing and neural adaptation.
• Practice-related gray matter changes are likely associated with synaptic remodeling in relevant brain areas.
• This study provides evidence for structural brain plasticity in response to learning a new cognitive skill.