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Representations of graphomotor trajectories in the human parietal cortex: evidence for controlled processing and
R J Seitz1, A G Canavan, L Yágüez
1Department of Neurology, Heinrich-Heine-University Düsseldorf, Germany.
The European Journal of Neuroscience
|February 1, 1997
Summary
This study reveals how the brain processes movement trajectories during writing. Different brain regions, particularly in the parietal cortex, are activated depending on the learning and execution phase of writing movements.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Motor Control
Background:
- Understanding the neural basis of motor control and learning is crucial for addressing movement disorders.
- Kinematic processing of movement trajectories involves complex neural computations.
Purpose of the Study:
- To identify specific cerebral areas activated during the kinematic processing of movement trajectories.
- To investigate the neural correlates of learning, performance, and imagery of writing movements.
Main Methods:
- Regional cerebral blood flow (rCBF) was measured using functional neuroimaging.
- Eight right-handed volunteers performed and imagined right-hand writing tasks.
- Data were analyzed in relation to movement velocity and learning phases.
Main Results:
- Writing movements activated the left motor, premotor, frontomesial cortex, and right anterior cerebellum, with activation correlated to writing velocity.
- Imagery did not activate these motor areas.
- Early learning and precise letter writing engaged the right intraparietal sulcus.
- Fast, overlearned writing and later-stage learning activated the bilateral posterior parietal cortex.
- Imagery of novel ideograms activated both anterior and posterior parietal areas.
Conclusions:
- Kinematic representations of graphomotor trajectories are multiply represented in the human parietal cortex.
- Distinct parietal subsystems may be involved in attentive sensory movement control and visuospatial processing during automatic performance.