Figural perception and parsing in visuo-spatial neglect.
We investigated copying of simple contours by a patient with left neglect after right hemisphere lesion. The stimuli were rectangles or circles with one or two internal boundaries defined by a black-white or a two-colour contrast. On each trial, the patient attempted to copy the contour of one of the (prespecified) sub-figures defined by a boundary contrast. Copying was accurate when boundaries were the right edges of sub-figures; when physically identical boundaries were the left edges of the sub-figures, accurate copying was impossible. These results held even when, prior to copying, the patient traced the outline of the figure (and ground) with his finger. A 'representational' account of object-centred neglect is supported.
Halligan
P W
PW
Rivermead Rehabilitation Centre, Oxford, UK.
Marshall
J C
JC
D001154:Art; D001288:Attention; D002544:Cerebral Infarction / Q000150:complications / Q000503:physiopathology* / Q000523:psychology; D003118:Color Perception; D015350:Contrast Sensitivity; D004292:Dominance, Cerebral; D006423:Hemianopsia / Q000209:etiology / Q000503:physiopathology* / Q000523:psychology; D006801:Humans; D008297:Male; D008570:Memory, Short-Term / Q000502:physiology; D008875:Middle Aged; D010364:Pattern Recognition, Visual; D011597:Psychomotor Performance