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Motor cortex retains and reorients neural dynamics during motor imagery
Biorxiv : the Preprint Server for Biology
|January 30, 2023
Summary
Motor cortex activity during imagined movements mirrors execution by recreating missing motor output signals in a unique neural subspace. This finding reveals how the brain simulates actions without physical movement.
Area of Science:
- Neuroscience
- Motor Control
- Cognitive Neuroscience
Background:
- The motor cortex is crucial for generating movement and is also active during motor imagery.
- Understanding the neural dynamics underlying motor imagery compared to execution is key to deciphering brain function.
Approach:
- Intracortical recordings of motor cortex activity in two individuals with spinal cord injury.
- Analysis of neural activity during actual and imagined isometric wrist extensions.
Key Points:
- Population-level motor cortex activity can be decomposed into subspaces active during both action and imagery, and subspaces unique to each task.
- Action-unique and imagery-unique subspaces share similar dynamical features despite occupying orthogonal neural dimensions.
- Motor imagery involves recreating missing motor output/feedback components within an imagery-specific subspace.
Conclusions:
- Motor cortex preserves overall population dynamics during motor imagery by utilizing distinct neural subspaces.
- This suggests a mechanism for simulating movement internally, crucial for understanding motor control and rehabilitation.
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