title: Topographical disorientation in a patient with right parahippocampal infarction.
abstract: We here describe a patient showing topographical disorientation (TD) after infarction of the right medial occipital lobe; the lesion included the parahippocampal gyrus. Clinical and neuropsychological observations demonstrated a specific pattern of impairment in terms of visual and visuospatial (topographical) learning, and memory. He had no landmark agnosia. His defective route finding resulted from impaired allocentric and egocentric spatial representations. Drawing illustrations of both familial and unfamiliar place and orientation tasks in an egocentric coordination context is a useful means of recognizing the influence of egocentric and/or allocentric spatial disturbance. The definition of "allocentric" or "egocentric" is confusing, and requires a standard for differentiating TD types.
authors.affiliation: Department of the Neurology, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Ten'noudai 1-1-1, Tsukuba, Ibaraki, 305-8575, Japan. kazishii@md.tsukuba.ac.jp.
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Ishii
authors.affiliation: Department of the Neurology, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Ten'noudai 1-1-1, Tsukuba, Ibaraki, 305-8575, Japan.
authors.forename: Reiko
authors.initials: R
authors.lastname: Koide
authors.affiliation: Department of the Neurology, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Ten'noudai 1-1-1, Tsukuba, Ibaraki, 305-8575, Japan.
authors.forename: Naomi
authors.initials: N
authors.lastname: Mamada
authors.affiliation: Department of the Neurology, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Ten'noudai 1-1-1, Tsukuba, Ibaraki, 305-8575, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Tamaoka
mesh_terms: D000377:Agnosia / Q000175:diagnosis; D003221:Confusion / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology*; D006624:Hippocampus / Q000503:physiopathology*; D006801:Humans; D007238:Infarction / Q000175:diagnosis / Q000503:physiopathology*; D008297:Male; D008568:Memory / Q000502:physiology; D008569:Memory Disorders / Q000175:diagnosis / Q000503:physiopathology; D008875:Middle Aged; D009483:Neuropsychological Tests; D011597:Psychomotor Performance / Q000502:physiology; D013028:Space Perception / Q000502:physiology*
keywords: Allocentric; Egocentric; Parahippocampal gyrus; Spatial memory; Topographic disorientation