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Object-based neglect for the near peripersonal space in drawing tasks
D Grossi1, D Esposito, C Cuomo
1Neuropsychology Laboratory, Department of Psychology, Second University of Naples, Caserta, Italy.
European Journal of Neurology
|July 31, 2007
Summary
This study details a patient with a brain lesion experiencing spatial neglect, particularly for objects closer to them. This finding reveals a new dimension of spatial processing deficits, extending current understanding of egocentric and allocentric frames of reference.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Clinical Neurology
Background:
- Spatial neglect is a common deficit following brain injury, typically characterized by an inability to attend to stimuli on one side of space.
- Existing models differentiate between egocentric (viewer-centered) and allocentric (object-centered) frames of reference in spatial processing.
Observation:
- A patient with a right temporo-occipital lesion exhibited spatial neglect predominantly in the left and near peripersonal space.
- In drawing tasks, the patient omitted elements located closer to them within individual figures.
- A specific copying task revealed that the patient's neglect of radially aligned elements was based on within-object coordinates.
Findings:
- The patient demonstrated a novel form of spatial neglect, termed 'radial neglect', affecting the processing of elements along a radial dimension within objects.
- This radial neglect was found to be organized according to within-object reference frames.
Implications:
- This observation suggests that spatial processing, including neglect, operates along a radial dimension, not solely based on egocentric or allocentric coordinates.
- The findings necessitate an expansion of current theoretical frameworks of spatial representation and neglect to incorporate this radial dimension.
- Understanding radial neglect could lead to more targeted rehabilitation strategies for patients with spatial awareness deficits.
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