場所の重複記憶錯誤の病態と発症機序—地理的定位錯誤を生じた2例の検討から

The pathophysiology and the etiology of the reduplicative paramnesia of the place: From two cases of the geographical mislocation

　地理的定位錯誤を生じた脳血管障害の2例を報告する．そのうち1例では地理的定位錯誤に加えて，重複記憶錯誤を認めた．地理的定位錯誤の成立には，非優位半球の前頭葉機能障害が関与していると考えられた．既報告を含め，重複記憶錯誤を呈した症例はすべて地理的定位錯誤も生じていた．地理的定位錯誤に加えて重複記憶錯誤を生じるには，視覚性記憶障害の関与が示唆された．また，視空間認知機能が保たれていれば，各認知機能が改善してきたタイミングで外泊を行うことで，地理的定位錯誤が消失し，これにより重複記憶錯誤の解消も期待できると考えられた．

　We report two cases of geographical mislocation caused by cerebrovascular disease. One patient had reduplicative paramnesia in addition to geographical mislocation. Geographical mislocation was thought to be involved with the frontal lobe dysfunction of the minor hemisphere. In common with cases reported in previous literature, the patient who presented reduplicative paramnesia also exhibited geographical mislocation. The contribution of visual memory impairment was suggested for reduplicative paramnesia. As for the treatment of symptoms, if the patients' visuospatial ability is preserved, trying an overnight stay at home when their cognitive functions recover may be helpful for complete recovery from these symptoms.