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エルゼビア / NSR協賛シンポジウム:体性感覚:生体警告、運動制御、発達、自己意識のための基本感覚システム
Elsevier - NSR Sponsored Symposium:Somatosensory; Fundamental sensory system for bodily alert, motor control, development, and self-consciousness

開催日 2014/9/11
時間 14:00 - 16:00
会場 Room C(502)
Chairperson(s) 村田 哲 / Akira Murata (近畿大学医学部生理学 / Department of Physiology, Kinki University Faculty of Medicine, Japan)
内藤 栄一 / Eiichi Naito (独立行政法人 情報通信研究機構 脳情報通信融合研究センター / Center for Information and Neural Networks (CiNet), National Institute of Information and Communication Technology, Japan)

Incorporation of tools in the body schema : a dual time scale process

  • S1-C-2-2
  • Ganesh Gowrishankar:1 
  • 1:Centre national de la recherche scientifique (CNRS-France), France 

Using even a simple tool like a pointing stick to point on a board is not trivial. An individual's brain has to first recognize the stick's size, shape and dynamics, locate its target in the visual and body coordinates, integrate this information with the stored body representation, before finally calculating the changes in limb angles required to make the movement to touch the target. It is generally accepted that the human dexterity with tools, which requires proficiency in the above complex and error prone calculations, stems from our ability to incorporate and use tools as extensions of our body. However, regularly examined tool incorporation processes are gradual and result from extended tool-use. On the other hand we can immediately switch between tools, say from pointing on a board with the pointing stick to pointing with a much shorter pen without requiring any practice. This ability points to the presence of immediate tool incorporation processes. Here, utilizing two novel experiments, we elucidate the presence of additional immediate tool incorporation effects that determine motor planning with tools. Interestingly, tools were observed to immediately induce a trial-by-trial, tool length dependent shortening of the perceived limb lengths, opposite to observations after extended tool-use. Our results thus indicate that tools induce a dual-effect on our body representation; an immediate shortening that critically affects motor planning with a new tool, and the slow elongation probably representing the increase in skill of a repeatedly used tool.

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