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Heterogeneous neural coding of corrective movements in motor cortex.
Adam S Dickey1, Yali Amit, Nicholas G Hatsopoulos
1Committee on Computational Neuroscience, University of Chicago Chicago, IL, USA.
Frontiers in Neural Circuits
|April 12, 2013
Summary
Neural activity in the brain during reaching movements is mostly linear. However, some neurons show a replacement coding during double-step reaches, potentially monitoring sensory feedback.
Area of Science:
- Neuroscience
- Motor Control
- Neural Coding
Background:
- Neural activity in the motor cortex is typically assumed to linearly encode movements.
- Previous studies suggest neural coding may be replaced during corrective movements in double-step reaching paradigms.
Purpose of the Study:
- To directly compare linear encoding and replacement hypotheses of neural activity during double-step reaching.
- To investigate the role of specific neural subpopulations in motor control and sensory monitoring.
Main Methods:
- Recording neural data from multi-electrode arrays in the motor and premotor cortices of rhesus macaques.
- Analyzing neural activity during a double-step reaching task.
Main Results:
- A majority of neurons showed linear encoding of movement during the double-step task.
- A minority of neurons exhibited a significant drop in firing rate, consistent with the replacement hypothesis.
- Neural activity in the replacement subpopulation tended to lag observed movement.
Conclusions:
- While linear encoding is dominant, a subpopulation of neurons may employ a replacement strategy during double-step reaching.
- This replacement coding might be involved in monitoring the sensory consequences of motor commands.
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