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Grip force scaling after hemispatial neglect
A Shaw1, S R Jackson, M Harvey
1Centre for Perception, Attention, and Motor Sciences, School of Psychology, University of Wales, Bangor, UK.
Neuroreport
|January 14, 1998
Summary
Spatial neglect patients underestimate space, showing increased grip force for left-sided objects. This suggests spatial compression impacts action guidance, not just perception.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Perception
Background:
- Spatial neglect is often explained by impaired extrapersonal space representation.
- Some theories propose spatial compression following neglect, leading to underestimation of stimuli in the affected hemifield.
Observation:
- This study used grip force scaling during prehension as an indirect measure of perceived object size.
- Investigated how neglect patients perceive object size in their left hemifield.
Findings:
- Neglect patients demonstrated significantly increased grip force for objects presented in their left hemifield.
- This indicates a potential overestimation or altered scaling of grip force for left-sided stimuli.
Implications:
- Findings support the spatial compression account of neglect, specifically impacting visually guided actions.
- Suggests a distinction between visual processing for object recognition and for action guidance in neglect.