Cortical plasticity following motor skill learning during mental practice in stroke

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Motor Control

Background:

• Mental practice (MP) involves cognitive rehearsal of movements.
• MP is a noninvasive, cost-effective method for repetitive, task-specific practice (RTP).
• Previous data suggest MP combined with RTP enhances arm use and function post-stroke.

Purpose of the Study:

• To investigate if cortical plasticity underlies the treatment effect of MP combined with RTP.
• To assess changes in brain activity associated with MP in chronic stroke patients.

Main Methods:

• Ten chronic stroke patients with motor deficits underwent 10 weeks of therapy emphasizing daily living activities (ADLs).
• Subjects received MP sessions focused on practiced ADLs immediately after therapy.
• Functional magnetic resonance imaging (fMRI) was used to evaluate cortical changes before and after the intervention.

Main Results:

• Patients showed significant improvements in the Action Research Arm Test (ARAT) and Fugl-Meyer Assessment (FM) scores.
• Post-intervention fMRI revealed increased activation in motor and premotor cortex areas and superior parietal cortex.
• Observed brain changes correlated with behavioral improvements in arm function.

Conclusions:

• Mental practice (MP) is a user-friendly, cost-effective strategy for improving arm outcomes in stroke patients.
• This study provides the first evidence of cortical map alterations resulting from MP training.
• The findings suggest MP facilitates neuroplasticity, contributing to functional recovery after stroke.