3D left hyperschematia after right brain damage

Gilles Rode, Patrice Revol, Yves Rossetti, Giuseppe Vallar

Research output: Contribution to journalArticlepeer-review

Abstract

A quantitative assessment of a distortion involving the left side of space, both in two-dimensional (drawing), and three-dimensional (modeling), visuo-constructional tasks is reported in a patient with a right temporoparieto-occipital lesion, and left hemianopia, without visuospatial neglect. In drawing and clay modeling of objects the patient exhibited a disproportionate enlargement of the left-hand side of objects. Matching perceptually two rectangles, the patient underestimated the left side of the stimulus. In a visuomotor task requiring the reproduction of horizontal extent, the patient exhibited a leftward overextension. Observations in two right-brain-damaged patients by Rode, Michel, Rossetti, Boisson, and Vallar (2006, Neurology, 67, 1801) are confirmed and extended. The patient's impairment may involve a disordered representation of extrapersonal space, with a leftward disproportionate expansion of the spatial medium ('hyperschematia'). Accordingly, symmetrical productions are compensatorily expanded leftwards, and the left sides of objects are perceived as smaller in horizontal extent. The disorder is largely independent of left spatial neglect.

Original languageEnglish
Pages (from-to)369-377
Number of pages9
JournalNeurocase
Volume14
Issue number4
DOIs
Publication statusPublished - 2008

Keywords

  • Hyperschematia
  • Left hemianopia
  • Left spatial neglect
  • Right brain damage
  • Size distortion

ASJC Scopus subject areas

  • Clinical Neurology

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