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Interactively Integrating Reach and Grasp Information in Macaque Premotor Cortex.
Junjun Chen1,2, Guanghao Sun1,3, Yiwei Zhang1,3
1Qiushi Academy for Advanced Studies, Zhejiang University, Hangzhou, 310027, China.
Neuroscience Bulletin
|June 21, 2025
Summary
The dorsal premotor cortex (PMd) integrates reach and grasp cues, showing neurons encode both but interact dynamically. This reveals insights into motor planning and brain-machine interfaces.
Area of Science:
- Neuroscience
- Motor Control
- Cognitive Neuroscience
Background:
- Reach-to-grasp movements necessitate integrating object location and grip type.
- The precise planning mechanisms and interaction between reach and grasp components are not fully understood.
Purpose of the Study:
- To investigate how the dorsal premotor cortex (PMd) integrates sequential reach and grasp cues.
- To determine the extent of interaction between reach and grasp representations in the PMd.
Main Methods:
- A novel experimental paradigm with delayed reach and grasp cues in monkeys.
- Recording neural activity in the dorsal premotor cortex (PMd).
- Utilizing population-level analysis and canonical correlation analysis.
Main Results:
- The PMd represents reach and grasp similarly but not independently.
- Over half of PMd neurons showed incongruent modulations upon receiving the second cue.
- Distinct neural patterns emerged, with a shared subspace preserving initial cue encoding.
Conclusions:
- The PMd exhibits interactive planning of reach and grasp.
- Findings offer insights into neural representations for motor control.
- Potential applications for brain-machine interfaces are suggested by the interactive neural dynamics.
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