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A key region in the human parietal cortex for processing proprioceptive hand feedback during reaching movements
Alexandra Reichenbach1, Axel Thielscher, Angelika Peer
1Max Planck Institute for Biological Cybernetics, Tübingen, Germany; Institute of Cognitive Neuroscience, University College London, UK.
Neuroimage
|September 25, 2013
Summary
The posterior medial intraparietal sulcus (mIPS) is crucial for proprioceptive feedback during reaching. Distinct areas in the posterior parietal cortex (PPC) process single-sensory versus multi-sensory information for movement correction.
Area of Science:
- Neuroscience
- Motor Control
- Sensory Processing
Background:
- Human movements adapt to changing environments via sensory feedback loops.
- The posterior parietal cortex (PPC) is implicated in visually guided movements.
- Understanding the role of PPC in proprioceptive and multi-sensory integration is crucial for motor control.
Purpose of the Study:
- To investigate whether distinct sub-regions of the left PPC process proprioceptive-only versus multi-sensory information for hand position during reaching.
- To determine the causal involvement of specific PPC areas in online movement control using transcranial magnetic stimulation (TMS).
Main Methods:
- Event-related TMS was applied to distinct sites within the left PPC.
- Force perturbations were used to challenge reaching movements.
- Participants performed reaching tasks with and without visual feedback of their hand.
Main Results:
- TMS over the posterior medial intraparietal sulcus (mIPS) impaired reaching accuracy when only proprioceptive feedback was available.
- TMS over the anterior intraparietal sulcus (aIPS) increased reaching time when visual feedback was present.
- This indicates differential roles for distinct PPC sub-regions in processing sensory information for movement correction.
Conclusions:
- The posterior mIPS causally contributes to processing proprioceptive feedback for online reaching control.
- Distinct cortical areas within the PPC are responsible for processing proprioceptive-only and multi-sensory information for rapid motor adjustments.
- This research elucidates the specialized neural mechanisms underlying sensory integration in motor control.
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