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mzkIII 2011/07/30
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ザリガニに意志があることが判明！ 北大
1 ： ◆BB2C/xRDfM (東京都)：2011/05/01(日) 20:39:30.97 ID:sNeyYZOP0● ?2BP(69) ザリガニに意志、歩く前に脳が活動 無脊椎動物で初確認 北大 2011/5/1 20:30 北海道大学の加賀谷勝史学術研究員と高畑雅一教授は、ザリガニが歩行などをするときに働く 脳の仕組みを解明した。実際に歩く１～２秒前に、脳の神経細胞が活動を始めていた。同じ現象 は霊長類などでも確認されているが、無脊椎動物では初めて。比較的単純な脳を持つとみられて いたザリガニが外部刺激で動く反射ではなく、意志を持って動いていたことを示す成果だ。 加賀谷研究員らは、細い電極を脳の神経細胞に付けたザリガニを歩かせる実験をした。複数の 神経細胞を調べたところ、歩き出す１～２秒前に電圧が上がり、活動を始める特定の細胞を見つ けた。 この神経細胞は、歩き始めると逆に電圧が下
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