  Such accounts of autonomous agency take seriously the need to distinguish an agent’s power from the power of the psychic forces that push and pull her. Yet the obscurities of the special sort of causation they evoke are enough to prevent most philosophers from embracing this conception of autonomous agency. To mention just a few familiar challenges: If agent-causing an event does not involve doing something to bring it about that the event occurs, then how does the agent exert her causal power? and why does this power produce its effects at one time rather than another? If, on the other hand, an agent must do something in order to agent-cause an action, then doesn’t this require that she undergo some change? and isn’t this change of state itself an event?