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Postural Representations of the Hand in the Primate Sensorimotor Cortex
James M Goodman1, Gregg A Tabot1, Alex S Lee1
1Committee on Computational Neuroscience, University of Chicago, Chicago, IL, USA.
Neuron
|November 1, 2019
Summary
Neural activity in the brain tracks hand posture during grasping, unlike arm movements. This suggests distinct cortical representations for hand and arm actions, crucial for manual dexterity.
Area of Science:
- Neuroscience
- Motor Control
- Somatosensation
Background:
- Proprioception is essential for manual dexterity.
- Cortical studies of proprioception have largely ignored hand-specific actions like grasping.
- Understanding neural representations of hand movements is incomplete.
Purpose of the Study:
- To investigate neural activity in the somatosensory and motor cortices during hand grasping.
- To compare neural representations of hand grasping with those of arm reaching movements.
- To elucidate the distinct cortical processing of arm and hand movements.
Main Methods:
- Recording neural activity in monkey somatosensory and motor cortices.
- Simultaneously measuring time-varying hand kinematics during object grasping.
- Analyzing neural responses in relation to hand posture and movement kinematics.
Main Results:
- Neurons in both somatosensory and motor cortices preferentially track multi-joint hand postures during grasping.
- Neural responses during grasping differ from those during reaching, which track arm kinematics (e.g., velocity).
- Cortical neurons show distinct representations for hand postures versus arm movement parameters.
Conclusions:
- The brain employs different neural strategies for representing hand and arm movements.
- Somatosensory and motor cortices encode hand posture during grasping.
- These findings highlight functional specialization in cortical motor control for different effectors.
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