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Updated: Aug 6, 2026
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Motor Imagery Brain-Computer Interface in Rehabilitation of Upper Limb Motor Dysfunction After Stroke
Published on: September 1, 2023
Correlation of Motor-Task Related Brain Activation Changes With Motor Performance Changes Induced by
George F Wittenberg1,2,3, Xiaoyan Leng4, Andrew J Butler5,6
1Wake Forest University SOM, Department of Neurology, Program in Rehabilitation, Winston-Salem, NC, USA.
Neurorehabilitation and Neural Repair
|July 21, 2026
Summary
Constraint Induced Movement Therapy (CIMT) improved motor function after stroke. While group brain activation changes were minimal, individual recovery correlated with increased primary motor cortex activation, suggesting effort-related neural plasticity.
Area of Science:
- Neuroscience
- Rehabilitation Medicine
- Medical Imaging
Background:
- Constraint Induced Movement Therapy (CIMT) research has explored its biological underpinnings.
- Previous studies published transcranial magnetic stimulation results from CIMT research.
- This study investigated brain activation changes during CIMT in stroke survivors.
Purpose of the Study:
- To evaluate changes in motor-task related brain activation during CIMT.
- To assess the relationship between brain activation and functional recovery post-stroke.
- To examine these effects during both subacute and chronic stroke recovery periods.
Main Methods:
- fMRI of a hand task was performed on 42 hemiparetic stroke participants.
- Scans were conducted at baseline, post-intervention, and 4 months later.
- Effort and rate were controlled, with functional outcomes measured by the Wolf Motor Function Test (WMFT).
Main Results:
- Participants receiving CIMT showed significant improvements in the WMFT.
- Group-level analysis revealed no significant longitudinal changes in task-related brain activation.
- Individual analysis showed a significant correlation between increased WMFT task speed and increased ipsilesional M1 activation.
Conclusions:
- Functional gains from CIMT in stroke survivors were observed, despite limited group-level changes in cortical activation when controlled for effort/rate.
- Individual motor recovery was significantly associated with preserved or increased activation in the affected primary motor cortex.
- Post-stroke recovery may involve changes in how effort activates the motor cortex and distal neural changes.
