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A posture subspace in primary motor cortex
Patrick J Marino1,2, Lindsay Bahureksa2,3, Carmen Fernández Fisac2,3
1Dept. of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15260, USA.
Biorxiv : the Preprint Server for Biology
|August 26, 2024
Summary
The brain
Area of Science:
- Neuroscience
- Motor Control
- Computational Neuroscience
Background:
- The brain integrates movement goals and body posture for action generation.
- The motor cortex (M1) is crucial for combining these distinct information streams.
- Understanding M1's organization is key to explaining flexible movement control.
Purpose of the Study:
- To investigate how posture and movement goal information are organized within M1 neural activity.
- To determine the relationship between posture representation and movement commands in M1.
- To elucidate the neural mechanisms underlying flexible motor control in M1.
Main Methods:
- Recorded neural activity from the motor cortex (M1) in monkeys.
- Monkeys performed various tasks involving forearm movements across different postures.
- Analyzed neural population activity to identify posture- and goal-related components.
Main Results:
- Posture and goal information were found in separable, nearly orthogonal subspaces within M1.
- The representation of posture in M1 remained stable across different tasks.
- Neural trajectories for specific movement goals exhibited similar shapes regardless of the body posture.
Conclusions:
- M1 exhibits a simpler organization of posture information than previously understood.
- Compartmentalization of posture and goal information in M1 allows for flexible combination.
- This organization supports the generation of a wide range of actions by the brain.
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