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Parietal control of hand movement
Elisabeth Rounis1, Giovanni Buccino2, Ferdinand Binkofski3
1Chelsea and Westminster NHS Foundation Trust, West Middlesex University Hospital, Isleworth, United Kingdom; Department of Brain Sciences, Faculty of Medicine, Imperial College, London, United Kingdom.
Handbook of Clinical Neurology
|August 10, 2023
Summary
The parietal lobe
Area of Science:
- Neuroscience
- Cognitive Science
- Motor Control
Background:
- The parietal lobe is crucial for sensorimotor control, enabling hand use for object interaction.
- The dorsal stream, recently divided into dorso-dorsal and ventro-dorsal pathways, is key to processing action possibilities (affordances).
Approach:
- This research reviews the functional roles of dorsal stream subdivisions in processing stable and variable affordances.
- It examines how these pathways interact with ventral stream representations for hand movement control.
Key Points:
- The ventro-dorsal stream links to object manipulation, while the dorso-dorsal stream supports reaching and online action control.
- Stable affordances rely on prior knowledge, processed slowly, while variable affordances use fast, online visual processing.
- The dorso-dorsal stream codes variable affordances, and the ventro-dorsal stream codes stable affordances.
Conclusions:
- Understanding these dorsal stream subdivisions and their interaction with the ventral stream is vital for parietal control of hand movements.
- This knowledge may illuminate recovery mechanisms for complex motor deficits like limb apraxias.
Keywords:
CortexDorso-dorsal streamGraspHand controlMovementNeuronsParietal lobeStable affordancesVariable affordancesVentro-dorsal streamMore Related Videos
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