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[Right parietal lesions, spatial neglect and egocentric reference].

P Bartolomeo1, S Chokron, J D Degos

  • 1INSERM Unité 324, Centre Paul Broca, Paris.

Revue Neurologique
|April 1, 2000
PubMed
Summary

Right hemisphere damage impacts spatial perception. Extensive right parietal lesions cause rightward egocentric reference deviation, while sparing the right parietal lobe leads to leftward deviation, independent of neglect signs.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Context:

  • Understanding the human brain's spatial processing capabilities is crucial.
  • Right hemisphere lesions are known to cause various neurological deficits.
  • The egocentric reference frame is fundamental for spatial orientation.

Purpose:

  • To investigate the relationship between lesion location in the right hemisphere and the subjective egocentric reference frame.
  • To determine if right parietal lobe damage influences the perception of the body's midline.

Summary:

  • A proprioceptive "straight-ahead" pointing task was used to assess the subjective sagittal middle in patients with right hemisphere vascular lesions and healthy controls.
  • Patients with extensive right parietal damage exhibited an ipsilesional (rightward) deviation of their egocentric reference.

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  • Conversely, patients with lesions sparing the right parietal lobe showed a contralesional (leftward) deviation, with no correlation to neglect battery performance.

    • Impact:

    • These findings help elucidate dissociations between left neglect and egocentric reference frame deviations.
    • The study raises questions about the intricate links between lesion site, neglect symptoms, and the egocentric frame of reference.
    • Provides insights into the neural basis of spatial orientation and midline perception.