Journal

The Japanese journal of neuropsychology

[Vol.28 No.1 contents]
Japanese/English

Full Text of this Article
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ArticleTitle A study on impaired mechanisms of sequential object manipulation: Based on the analysis and consideration of eye fixation
Language J
AuthorList Masashi Odagiri1)2), Keita Ueda3), Toshiya Murai3), Yoshitaka Ohigashi2), Shintaro Funahashi2)
Affiliation 1)Department of Physical Therapy, Faculty of Health Care Sciences, Himeji Dokkyo University
2)Department of Behavioral Cognitive Science, Graduate School of Human and Environmental Studies, Kyoto University
3)Department of Neuropsychiatry, Graduate School of Medicine, Kyoto University
Publication Japanese Journal of Neuropsychology: 28 (1), 49-65, 2012
Received Oct 20, 2010
Accepted Apr 28, 2011
Abstract To elucidate the underlying mechanisms of naturalistic action impairment, we analyzed the visual search of a patient, designated with spinocerebellar degeneration, using an eye camera during tasks of short routine actions. We especially focused on 'look-ahead fixations' (LAF; Pelz & Canosa, 2001), which were defined to be related to future actions, but not to ongoing actions. The number of LAF of the case was significantly smaller than that of control subjects. The patient also did not show a "task-dependent strategy" on LAF, in comparison with control subjects. Taking into consideration the role of LAF in everyday actions, the decline of LAF in the case could be considered as one of the major underlying mechanisms of his dysfunction in naturalistic actions. Thus, we considered the possible role of the cerebellum on cerebral function related to multiple object use, which is based on the current hypothesis concerning cerebellum-specific information processing.
Keywords ideational apraxia, disorder of sequential object manipulation, eye-hand coordination, look-ahead fixation, spinocerebellar degeneration

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