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Human functional anatomy of visually guided finger movements
S T Grafton1, J C Mazziotta, R P Woods
1Department of Radiology, University of California, Los Angeles School of Medicine.
Brain : a Journal of Neurology
|April 1, 1992
Summary
This study used brain imaging to map visually guided movement. Key brain areas like the motor cortex and cerebellum are involved in planning and executing movements, with specific regions activating based on task complexity.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Motor Control
Background:
- Visually guided movement relies on complex neural networks.
- Understanding the brain's functional anatomy is crucial for motor control research.
Purpose of the Study:
- To investigate the functional anatomy of visually guided movement using brain imaging.
- To identify brain regions involved in visuomotor tracking tasks and how task complexity affects their activation.
Main Methods:
- Positron emission tomography (PET) imaging was used to measure relative cerebral blood flow (relCBF).
- 18 healthy subjects performed visuomotor tracking tasks with varying temporal and spatial complexities.
- Brain activity was analyzed during different tracking conditions, including 'no go' contingencies and spatial cueing.
Main Results:
- Visuomotor tracking activated a network including the motor cortex, parietal cortex, supplementary motor area (SMA), and cerebellum.
- Increased temporal complexity (no go task) significantly increased relCBF in the SMA.
- Increased spatial complexity (cued target) significantly increased relCBF in the dorsal parietal and precuneate cortex.
Conclusions:
- The supplementary motor area (SMA) plays a role in sequencing movements.
- The medial and dorsal parietal cortex is involved in integrating spatial information for movement selection.
- Findings support existing clinical and physiological evidence on the neural basis of visually guided movement.