ABSTRACT

When a person drives his car, cautiously or not, certain very complicated series of actions take place. He starts the motor, manipulates the clutch, accelerates, turns, brakes the car, and so on. 'Driving one's car' is a very general description of what a person does that may apply to recognizably different series of actions; indeed, it is unlikely that a person who drives his car on different occasions performs precisely the same actions in the same order. To simplify matters let us consider just one action, say, signalling a turn, and to further narrow the scope of our inquiry let us suppose that this is done by raising one's arm as one sits at the wheel. Whenever a person signals, he does something describable, not as signalling, but in some other way. Whenever a person raises his arm certain muscles contract and certain other muscles relax in such a way that the arm structure is elevated.