Quantification of task-dependent cortical activation evoked by robotic continuous wrist joint manipulation in chronic hemiparetic stroke.
Martijn P Vlaar, Teodoro Solis-Escalante, Julius P A Dewald and 4 others
PMID 28412953WHAT IT FOUND
After stroke, people with severe sensory impairment had reduced brain responses to robotic wrist movement.
People with mild impairment showed reduced responses during active wrist tasks. The findings describe sensory pathway damage, not treatment benefit.
Key findings
01Participants with severe sensory impairment had lower brain responses to robotic wrist movement on both sides of the brain, and their responses were not lateralized.
02Participants with mild sensory impairment had lower brain responses during the active wrist task than unimpaired participants and participants without sensory impairment, and their active-task response power decreased relative to the passive task.
03Passive-task brain measures accounted for 75% of the variance in lesion volume of sensory and motor tracts.
STILL TO COME
How it was doneWhat they foundWhat it means for OTs
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What it does not show
The study was an experimental assessment in chronic stroke, not a treatment trial. One stroke participant was excluded from further analysis. One participant in the severe sensory impairment group had an unusually high response and may have been misclassified clinically. The method could not separate proprioceptive and tactile contributions to the brain responses. The repeatability of the brain-response metrics was not tested in this study.
Declared interests
The paper reports funding from the European Research Council.
The easy way to misread this
Do not read this as proof that robotic wrist movement or EEG assessment improves function. It was a small experimental assessment of sensory pathway responses, not a treatment trial.