title: On the origin of line bisection error in hemianopia.
abstract: The contralesional line bisection error in hemianopia is a well-known clinical phenomenon. Its origin, however, is still unclear. We therefore investigated the causes of the hemianopic bisection error in 84 patients with unilateral homonymous hemianopia without visuospatial neglect. Our results suggest that the contralesional bisection error is neither a consequence of the visual field defect itself nor a manifestation of strategic adaptation of attention and eye movements into contralesional hemispace. Additional extrastriate brain injury, presumably to occipito-temporal areas including the occipital white matter, seems to be critical for the emergence of the contralesional bisection error that is frequently associated with but separable from homonymous hemianopia.
authors.affiliation: Department of Psychology, Neuropsychology, Ludwig-Maximilians-University Munich, München, Germany. zihl@psy.lmu.de
authors.forename: Josef
authors.initials: J
authors.lastname: Zihl
authors.forename: Philipp
authors.initials: P
authors.lastname: Sämann
authors.forename: Thomas
authors.initials: T
authors.lastname: Schenk
authors.forename: Susanne
authors.initials: S
authors.lastname: Schuett
authors.forename: Ruth
authors.initials: R
authors.lastname: Dauner
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D001288:Attention / Q000502:physiology*; D001931:Brain Mapping; D002648:Child; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006423:Hemianopsia / Q000150:complications* / Q000473:pathology; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests; D010468:Perceptual Disorders / Q000209:etiology* / Q000473:pathology; D010775:Photic Stimulation / Q000379:methods; D011597:Psychomotor Performance / Q000502:physiology*; D011932:Reading; D014794:Visual Fields / Q000502:physiology*