地理認知障害 : 街並失認と道順障害

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Topographical disorientation was thought to be divided into two groups: scene agnosia and defective route finding.<BR>Patients with scene agnosia can morphologically perceive familiar buildings and streets, but cannot identify them. Thy can, however, remember their way around familiar areas. The six patientsin our study all exhibited a common lesion: the posterior part of the right parahippocampal gyrus. We think this region plays an important role in the development of scene agnosia. From the findings of this study, it is suggested that scene agnosia is caused by a disconnection between the visual area that perceives scene and the temporal association areas retaining memories of them.<BR>Patients with defective route finding, in contrast to scene agnosia, can identify familiar buildings and streets, but cannot remember their way around well known areas. When we placed them in one spot in an area they were familiar with, they could remember the names and locations of the buildings they could see from that spot; that is, the feature of defective route-finding is the inability to remember the positional relation between two points within a comparatively wide range not surveyable in a single visual experience; in a sense it is a disability in the sense of direction. In four patients ex-hibiting symptoms of defective route-finding, the common lesion was from the right retrosplenial region to the medial part of the parietal lobe, suggesting the association of that region with bearing and orientation functions for navigation over wide spaces.
日本めまい平衡医学会の論文
2003-08-01

地理認知障害 : 街並失認と道順障害

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