TY - JOUR
T1 - Paradoxical extension into the contralesional hemispace in spatial neglect
AU - Lenggenhager, Bigna
AU - Loetscher, Tobias
AU - Kavan, Nicole
AU - Pallich, Gianandrea
AU - Brodtmann, Amy
AU - Nicholls, Michael E R
AU - Brugger, Peter
PY - 2012/11
Y1 - 2012/11
N2 - 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.
AB - 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.
KW - Representational momentum
KW - Smooth pursuit
KW - Space distortion
KW - Spatial memory
KW - Spatial remapping
UR - http://www.scopus.com/inward/record.url?scp=84867142641&partnerID=8YFLogxK
U2 - 10.1016/j.cortex.2011.10.003
DO - 10.1016/j.cortex.2011.10.003
M3 - Article
AN - SCOPUS:84867142641
VL - 48
SP - 1320
EP - 1328
JO - Cortex
JF - Cortex
SN - 0010-9452
IS - 10
ER -