title: Paradoxical extension into the contralesional hemispace in spatial neglect.
abstract: To explore the idea of a perceptual distortion of space in spatial neglect, neglect patients, age-matched healthy controls and right hemisphere control patients judged the vanishing point of horizontally and vertically-moving stimuli. Hemifield of presentation and movement direction of the stimulus presentation was manipulated. The results suggest that neglect patients show a stronger response bias in the direction of the moving stimuli ("representational momentum") than healthy and right hemisphere controls. Furthermore, neglect patients, but not the control groups, showed a direction-specific response whereby the presence of neglect was associated with a larger representational momentum for leftward-moving stimuli. The one left-hemisphere patient with right-sided neglect showed the opposite effect. Thus, neglect patients showed a relative overextension into their neglected side of space. While these findings are in line with the idea of an extension in the representation of contralesional space, other explanations such as deficient spatial remapping, impairments in smooth pursuit and distortions in memorized visuo-motor movements are considered.
authors: Neuropsychology Unit, Department of Neurology, University Hospital, Zurich, Switzerland. bigna.lenggenhager@gmail.com
authors: Bigna
authors: B
authors: Lenggenhager
authors: Tobias
authors: T
authors: Loetscher
authors: Nicole
authors: N
authors: Kavan
authors: Gianandrea
authors: G
authors: Pallich
authors: Amy
authors: A
authors: Brodtmann
authors: Michael E R
authors: ME
authors: Nicholls
authors: Peter
authors: P
authors: Brugger
mesh_terms: D000368:Aged; D001288:Attention; D001931:Brain Mapping / Q000379:methods; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009068:Movement; D010468:Perceptual Disorders / Q000503:physiopathology*; D013028:Space Perception / Q000502:physiology*