PMID: 9194392Jan 1, 1997Paper

The disturbance of reversible operation in space in the early stage of Alzheimer's disease

Seishin shinkeigaku zasshi = Psychiatria et neurologia Japonica
K UtsumiN Takahata

Abstract

Constructional apraxia is one of the neuropsychological findings frequently observed in the early stage of the Alzheimer's disease, which may result from the visuo-spatial disturbances. The visual space consists of a variety of visual information processing, viewer-centered coordinate system, objects-centered coordinate system, integration of both coordinate systems, and verifying visual representation with the knowledge in the memory. The reversible operation in space, or mental rotation appears to play an important role in visuo-spatial functions, which refers to the operation of the visual representation at one orientation in viewer-centered coordinate system to construct the representation in object-centered coordinate system so that one can look like if it were presented at another orientation. To the present, little is known about reversible operation or mental rotation in patients with Alzheimer's disease. In this present paper, we attempted to investigate the ability of reversible operations in space so as to understand the mechanisms underlying constructional apraxia, or visuo-spatial disturbances in the early stage of Alzheimer's disease. The subjects were 12 patients with Alzheimer's disease in early stage (AD group)...Continue Reading

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