title: 3D left hyperschematia after right brain damage.
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.
authors.affiliation: Université de Lyon, Université Lyon 1, Inserm UMR-S 864, Bron, France. gilles.rode@chu-lyon.fr
authors.forename: Gilles
authors.initials: G
authors.lastname: Rode
authors.forename: Patrice
authors.initials: P
authors.lastname: Revol
authors.forename: Yves
authors.initials: Y
authors.lastname: Rossetti
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Vallar
mesh_terms: D000368:Aged; D001930:Brain Injuries / Q000473:pathology*; D007839:Functional Laterality; D006801:Humans; D008297:Male; D009483:Neuropsychological Tests; D010468:Perceptual Disorders / Q000473:pathology / Q000503:physiopathology*; D011597:Psychomotor Performance; D013028:Space Perception / Q000502:physiology*; D013037:Spatial Behavior / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*