Voluntary acts are preceded by electrophysiological (RPs). With spontaneous acts involving no preplanning, the main negative RP shift begins at about200 ms. Control experiments, in which a skin stimulus was timed (S), helped evaluate each subject's error in reporting the clock times for awareness of any perceived event.

This book presents an events-based view of human action somewhat different from that of what is known as "standard story". A thesis about trying-to-do-something is distinguished from various volitionist theses. It is argued then that given a correct conception of action's antecedents, actions will be identified not with bodily movements but with causes of such movements.