The automatic updating of egocentric spatial relationships and its impairment due to right posterior cortical lesions.
The non-visual updating of body-centred spatial relationships was investigated in an experiment in which blindfolded patients had to point to previously seen targets after a body rotation in the absence of vision. Patients with lesions to the right dorsal (RD) area were impaired at updating their positions relative to non-RD patients and normal subjects: they tended to underestimate systematically the angle through which they had turned. The results are interpreted in terms of impoverished locomotor input and/or systematically biased processing or locomotor proprioception in the RD patients, which prevented accurate tracking of changes in egocentric spatial relationships.
Farrell
M J
MJ
Medical Research Council Cognition and Brain Sciences Unit, Cambridge, UK. farrrell@fs4.psy.man.ac.uk
Robertson
I H
IH
D000328:Adult; D002540:Cerebral Cortex / Q000473:pathology*; D005260:Female; D006801:Humans; D007092:Imagination / Q000502:physiology; D008297:Male; D008875:Middle Aged; D009949:Orientation / Q000502:physiology; D010296:Parietal Lobe / Q000473:pathology; D010468:Perceptual Disorders / Q000523:psychology*; D012399:Rotation; D013028:Space Perception / Q000502:physiology*; D020521:Stroke / Q000473:pathology / Q000523:psychology*