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Is grasping impaired in hemispatial neglect?
M Harvey1, S R Jackson, R Newport
1Department of Psychology, University of Glasgow, Glasgow, UK. M.Harvey@psy.gla.ac.uk
Behavioural Neurology
|July 16, 2002
Summary
Patients with right hemisphere strokes performed normally in object grasping tasks, regardless of visual feedback or hemispatial neglect. Their hand movements showed no significant differences in curvature compared to controls.
Area of Science:
- Neuroscience
- Motor Control
- Cerebral Stroke Research
Background:
- Right unilateral cerebral stroke can impact motor control and spatial awareness.
- Hemispatial neglect is a common deficit following right hemisphere damage.
- Understanding object grasping deficits is crucial for rehabilitation after stroke.
Purpose of the Study:
- To investigate object grasping abilities in patients with right unilateral cerebral stroke.
- To compare motor control and spatial processing in stroke patients with and without hemispatial neglect.
- To analyze the effect of visual feedback on reach-to-grasp kinematics.
Main Methods:
- Tested object grasping in patients with right hemisphere stroke and healthy controls.
- Assessed reaches to objects in different spatial locations and distances.
- Varied visual feedback conditions during reaching tasks (free vision vs. no visual feedback).
- Analyzed grasp parameters (grip aperture, orientation, timing) and hand path curvature.
Main Results:
- Stroke patients demonstrated normal grasp kinematics (aperture, orientation, timing).
- Control subjects showed straighter hand paths with visual feedback; stroke patients did not.
- No significant behavioral differences were observed between stroke patients with or without hemispatial neglect.
Conclusions:
- Right hemisphere stroke does not inherently impair grasp kinematics.
- Visual feedback influences hand path planning in healthy individuals but not in right hemisphere stroke patients.
- Hemispatial neglect does not appear to affect reach-to-grasp execution in this patient cohort.
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