# 清醒的意識狀態是由四種元素組成的:動作、感覺、感受與思想。如果沒有這四種活動,人會立刻入睡。動作與感覺都理所當然被視為中樞神經系統的功能;但除此之外,我們認為心智歷程也是同類的功能。——《身體的智慧》
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