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Regional specialization of movement encoding across the primate sensorimotor cortex.
Simon Borgognon1,2,3,4,5, Nicolò Macellari1,2,3,6, Alexandra M Hickey1,2,3,4
1NeuroX Institute and Brain Mind Institute, School of Life Sciences, Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland.
Nature Communications
|July 2, 2025
Summary
Researchers studied how the brain controls movement across the dorsal premotor cortex (PMd), primary motor cortex (M1), and somatosensory cortex (S1). They found distinct neural subspaces in each region, suggesting a serial process for motor control.
Area of Science:
- Neuroscience
- Motor Control
- Computational Neuroscience
Background:
- The neural mechanisms underlying the generation of voluntary movements by the cerebral cortex are not fully understood.
- Understanding how the brain encodes task-specific movements is crucial for deciphering motor control.
Purpose of the Study:
- To investigate the encoding of task-specific locomotor behaviors within the dorsal premotor cortex (PMd), primary motor cortex (M1), and primary somatosensory cortex (S1) in primates.
- To determine how neural population activity and communication between cortical regions contribute to movement generation.
Main Methods:
- Analysis of neural population activity during well-controlled primate locomotor behaviors under naturalistic conditions.
- Characterization of neural activity within low-dimensional manifolds and task-dependent/independent subspaces across PMd, M1, and S1.
Main Results:
- Neural activity was confined to low-dimensional manifolds and partitioned into task-dependent and task-independent subspaces.
- PMd predominantly utilized its task-dependent subspace, while S1 and M1 largely operated within their task-independent subspaces.
- Temporal aspects of movement were encoded in task-independent subspaces, which also mediated PMd-to-M1 communication.
Conclusions:
- The cerebral cortex employs a serial processing strategy for motor control, with distinct regions specializing in different computational aspects.
- Task-specific computations are performed in PMd, followed by the generation of task-independent commands in M1 for movement execution.
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