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Mirror Neuron System and Upper-Limb EMG Activity During Reaching Imitation in Stroke Survivors: Comparing Outcomes
A Sulfikar Ali1, Ashokan Arumugam2,3,4,5, Mayur Bhat6
1Department of Physiotherapy, Kasturba Medical College Mangalore, Manipal Academy of Higher Education, Manipal, India.
Neurorehabilitation
|January 22, 2026
Summary
Observing normal upper limb movements enhances brain mirror neuron system activity and muscle engagement in stroke survivors compared to aberrant movements. This suggests focusing on correct movement patterns in rehabilitation is key for recovery.
Area of Science:
- Neuroscience
- Rehabilitation Medicine
- Motor Control
Background:
- Stroke often impairs upper limb function, affecting motor control and neuronal activity.
- The mirror neuron system (MNS) plays a crucial role in motor learning and imitation.
- Understanding how observing different movement patterns impacts neural and muscular responses is vital for stroke rehabilitation.
Purpose of the Study:
- To investigate differences in brain cortical and upper limb muscle activity during the imitation of a reaching task after observing normal versus aberrant movement patterns in individuals post-stroke.
- To assess the influence of observed movement quality on mirror neuron system (MNS) activity and paretic muscle engagement.
Main Methods:
- A cross-sectional study involving 17 individuals with unilateral stroke.
- Electroencephalography (EEG) to measure mu-rhythm (MNS activity) and electromyography (EMG) for upper limb muscle activity (percentage maximum voluntary contraction).
- Participants observed prerecorded normal and aberrant upper limb reaching tasks, then imitated normal movements; data collected during action observation and imitation (AOI).
Main Results:
- EEG analysis showed significantly greater mu-rhythm suppression (indicating enhanced MNS activity) during observation of normal movements compared to aberrant movements at C3 and C4 electrodes (p < 0.01).
- EMG revealed a significant increase in supraspinatus muscle activity during imitation following the observation of normal movements (p = 0.027).
Conclusions:
- Observation of normal upper limb movements leads to superior MNS activation and greater muscle engagement compared to observing aberrant movements in stroke survivors.
- Therapist-guided action observation training focusing on normal movement patterns, while avoiding aberrant models, is recommended as a cost-effective, neurophysiology-based adjunct for stroke rehabilitation.
Keywords:
Mu suppressionelectromyographymirror neuron activationmovement errormovement observationupper extremityMore Related Videos
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