Memory for visuospatial location following selective hippocampal sclerosis: the use of different coordinate systems |
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Authors: | Incisa della Rocchetta A Samson S Ehrle N Denos M Hasboun D Baulac M |
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Institution: | Department of Psychology, University College London, London, United Kingdom. a.incisa@ion.ucl.ac.uk |
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Abstract: | This study addressed the role of the medial temporal lobe regions and, more specifically, the contribution of the human hippocampus in memory for body-centered (egocentric) and environment-centered (allocentric) spatial location. Twenty-one patients with unilateral atrophy of the hippocampus secondary to long-standing epilepsy (left, n = 7; right, n = 14) and 15 normal control participants underwent 3 tasks measuring recall of egocentric or allocentric spatial location. Patients with left hippocampal sclerosis were consistently impaired in the allocentric conditions of all 3 tasks but not in the egocentric conditions. Patients with right hippocampal sclerosis were impaired to a lesser extent and in only 2 of the 3 tasks. It was concluded that hippocampal structures are crucial for allocentric, but not egocentric, spatial memory. |
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