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Egocentric disorientation following bilateral parietal lobe damage
WILSON, B.A., Berry, E., Gracey, F., Harrison, C., Stow, L., Macniven, J., Weatherley, J., and YOUNG, A.W
Cortex, 41(4), 547-554
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Aguirre and D'Esposito (1999) suggested a taxonomy and theoretical framework for understanding topographical disorders. One of the problems they described involved egocentric disorientation, in which deficits are not strictly confined to the topographical sphere but are seen on a wide variety of visuo-spatial paradigms. Here, we report a neuropsychological investigation of MU, a person with egocentric disorientation. To test the usefulness of Aguirre and D'Esposito's framework, we administered tests which were predicted to be easy or difficult for people with egocentric disorientation, to show that MU was impaired on tasks sensitive to egocentric disorientation and that he showed adequate performance on tests sensitive to other types of topographical representation. Thus MU showed normal performance on a test of recognition of famous landmarks and he could identify photographs of personally familiar places in his home town, yet he could not say how to get from a recognised building to another place in his environment. His performance fulfils the criteria for egocentric disorientation and fits the predictions derived from Aguirre and D'Esposito's views.