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A kinematic analysis of distractor interference effects during visually guided action in spatial neglect
L A Corben1, J B Mattingley, J L Bradshaw
1Department of Occupational Therapy, Monash Medical Centre, Clayton, Victoria, Australia.
Summary
Patients with right hemisphere damage and spatial neglect show biased movements towards their unaffected side, even when distractors are on the affected side. This impacts movement planning and guidance.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Rehabilitation Science
Background:
- Right hemisphere damage often leads to spatial neglect, affecting perception and action.
- Patients with neglect may exhibit motor anomalies in their ipsilesional limb, impacting movements toward the affected side.
Purpose of the Study:
- To investigate the susceptibility of visually guided movements in neglect patients to visual distractors.
- To determine if distractors on the ipsilesional or contralesional side differentially affect movement accuracy and timing.
Main Methods:
- Eleven right hemisphere patients with visual neglect and 11 controls performed a double-step visually guided movement task.
- Participants used their ipsilesional hand to respond to targets presented alone or with distractors.
- Movement interference was assessed based on distractor location (ipsilesional vs. contralesional).
Main Results:
- Neglect patients were slower and made more errors than controls.
- Ipsilesional distractors caused significant interference, leading to failed movements or movements to the distractor.
- Distractors on the contralesional side had minimal impact on movements to ipsilesional targets.
Conclusions:
- Right hemisphere damage creates a bias favoring actions directed towards the ipsilesional side.
- This bias influences visuomotor processing from initial programming to terminal guidance stages.
- Understanding this bias is crucial for developing targeted rehabilitation strategies for spatial neglect.