Philosophers writing on the subject of human action have found it tempting to introduce their subject by raising Wittgenstein's question, 'What is left over if you subtract the fact that my arm goes up from the fact that I raise my arm?' The presumption is that something of particular interest is involved in an action of raising an arm that is not present in a mere bodily movement, and the philosopher's task is to specify just what this is. Unfortunately, such an approach does not take us very far, since a person could properly be said to raise his (or her) arm while asleep or hypnotized even...

Philosophers writing on the subject of human action have found it tempting to introduce their subject by raising Wittgenstein's question, 'What is left over if you subtract the fact that my arm goes up from the fact that I raise my arm?' The presumption is that something of particular interest is involved in an action of raising an arm that is not present in a mere bodily movement, and the philosopher's task is to specify just what this is. Unfortunately, such an approach does not take us very far, since a person could properly be said to raise his (or her) arm while asleep or hypnotized even...