Abstract

… We learn from anatomy, that the immediate object of power in voluntary motion, is not the member itself which is moved, but certain muscles, and nerves, and animal spirits, and, perhaps, something still more minute and more unknown, through which the motion is successively propagated, ere it reach the member itself whose motion is the immediate object of volition. Can there be a more certain proof, that the power, by which the whole operation is performed … is, to the last degree, mysterious and unintelligible?Recent metaphysical theories, which stress the importance of an agent as a sort of cause, raise again the question of where and how in the chain of events involved in voluntary motion the human agent “immediately” exerts his influence. The matter is still every bit as mystifying as Hume suggests. We know that when a human being moves voluntarily, there are events in his central nervous system which are causes of the motion. Of course, nothing whatever need be known about these events in order to move voluntarily. Either human agents produce these events or they do not.