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Layer-Specific Contributions to Imagined and Executed Hand Movements in Human Primary Motor Cortex
Andrew S Persichetti1, Jason A Avery1, Laurentius Huber2
1Laboratory of Brain and Cognition, NIMH, NIH, 10 Center Drive, Bethesda, MD 20892, USA.
Current Biology : CB
|March 30, 2020
Summary
Motor imagery, imagining movements, activates superficial brain layers in the primary motor cortex. This differs from executed movements, suggesting a neural basis for how imagining actions enhances motor performance.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Motor Control
Background:
- Motor imagery, the mental simulation of motor actions, is vital for motor planning and learning.
- Behavioral studies suggest motor imagery influences the primary motor cortex (M1), but the underlying neural mechanisms are unclear.
Purpose of the Study:
- To investigate the laminar neural activity in M1 during motor imagery versus executed movements.
- To elucidate how imagined movements might directly impact motor cortex function and performance.
Main Methods:
- Utilized vascular space occupancy (VASO) fMRI to measure neural activity across cortical layers in M1.
- Compared laminar M1 responses during executed finger tapping versus imagined finger tapping.
Main Results:
- Executed movements activated both superficial and deep M1 layers.
- Motor imagery selectively activated superficial M1 layers.
- Both imagined and executed movements preceding finger tapping induced repetition suppression in superficial layers and repetition enhancement in deep layers.
Conclusions:
- Motor imagery engages superficial M1 layers, distinct from the full laminar activation during execution.
- These findings provide a neural mechanism for how motor imagery influences motor performance.
- Neural repetition effects observed may explain behavioral improvements like repetition priming.
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