Grip force scaling after hemispatial neglect.
Spatial neglect has been explained as an impairment in the representation of extrapersonal space. One account suggests that representations of extrapersonal space are spatially compressed following neglect. In support of this view it has been demonstrated that neglect patients systematically underestimate the size of stimuli presented in their left hemifield. In the current study we investigated this phenomena by obtaining an indirect measure of perceived object size - the scaling of grip force during prehension. We demonstrate for the first time that neglect patients show increased levels of grip force for objects presented in their left hemifield. This finding is discussed with reference to a proposed distinction between visual processing used for object recognition, and visual processing used to guide action.
Shaw
A
A
Centre for Perception, Attention, and Motor Sciences, School of Psychology, University of Wales, Bangor, UK.
Jackson
S R
SR
Harvey
M
M
Newport
R
R
Krämer
T
T
Dow
L
L
D000368:Aged; D002561:Cerebrovascular Disorders / Q000503:physiopathology*; D005260:Female; D007839:Functional Laterality; D018737:Hand Strength / Q000502:physiology*; D006423:Hemianopsia; D006429:Hemiplegia; D006801:Humans; D008297:Male; D008875:Middle Aged; D012016:Reference Values