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[Vol.20 No.4 contents]
Japanese/English
Full Text of this Articlein Japanese PDF (148K) |
| ArticleTitle | The mechanisim of "apraxia of tool use" |
| Language | J |
| AuthorList | Yoshitsugu Nakagawa1), Mika Otsuki2), and Maki Inokawa3)4) |
| Affiliation | 1)School of Nursing and Social Services, and 2)School of Psychological Sciences, Health Sciences University of Hokkaido, 3)Kyoritsu Rehabilitation Hospital, 4)Department of Rehabilitation, Daini-Kyoritsu Hospital |
| Publication | Japanese Journal of Neuropsychology: 20 (4), 241-253, 2004 |
| Received | Oct 24, 2003 |
| Accepted | Jun 22, 2004 |
| Abstract | To disclose the underlying mechanism for 'apraxia of tool use', we tentatively divided tools into two groups: one is familiar tools and the other is unfamiliar tools. Additionally, we theoretically divided the execution process for single tool use into two steps: one is the process of retrieving and designing how to use a single tool (step1), and the other is the process of actual manipulation follows the step1 (step2). We adjusted most of principal hypothesis of the mechanism of single tool use according to these two point of view, and elucidated their essence and difference. Furthermore, we presented two patients with left hemisphere damage, who exclusively showed apraxia of tool use when they required to use the tools which manipulation contains repetitive or symbolic movements. Their deficits seemed to be ascribed to a failure to integrate somatosensation and action. This observation indicates that it is preferred to divide tools into another two groups to explain the mechanism of single tool use. One is the tools which manipulation contains repetitive or symbolic movements and the other is the tools which does not demand repetitive or symbolic movements. We concluded that the underlying mechanism for 'apraxia of tool use' should be attributed to a deficit on the process in the step 1 with the tools which manipulation contains repetitive or symbolic movements. |
| Keywords | conceptual apraxia, amnesia of usage, ideational apraxia, apraxia of tool use, somato-sensation |
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