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Preshaping and continuous evolution of motor cortical representations during movement preparation
Annette Bastian1, Gregor Schöner, Alexa Riehle
1Institut de Neurosciences Physiologiques et Cognitives, Equipe Perception & Cognition, INPC-CNRS, 31, chemin Joseph Aiguier, 13402 Marseille Cedex 20, France.
The European Journal of Neuroscience
|November 19, 2003
Summary
Motor cortex neurons represent movement direction using graded population activity. This neural representation adapts based on partial directional information and evolves during movement preparation.
Area of Science:
- Neuroscience
- Motor Control
- Computational Neuroscience
Background:
- Motor cortical neurons encode movement direction during preparation.
- Neuronal representation of partial directional information remains poorly understood.
Purpose of the Study:
- Investigate how motor cortex neurons represent partial information about movement direction.
- Examine the dynamic evolution of this neural representation during movement preparation.
Main Methods:
- Monkeys performed a center-out pointing task with varying levels of directional uncertainty.
- Neuronal activity in the motor cortex was recorded during a delay period.
- Distributions of population activation (DPAs) were estimated based on neuronal tuning curves.
Main Results:
- DPAs were preshaped by prior directional information, with peaks aligning with possible movement directions.
- DPA peaks sharpened as the movement cue approached and shifted to the specified direction post-cue.
- Broader directional uncertainty resulted in broader DPAs; shorter reaction times correlated with narrower DPAs.
Conclusions:
- Motor cortex exhibits a graded preshaping of movement direction representation based on partial information.
- The neural representation dynamically evolves during the preparatory period, refining towards movement initiation.