Ego depletion: A resource model of volition, self-regulation, and controlled processing

Making choices, responding actively instead of passively, restraining impulses, and other acts of self-control and volition all draw on a common resource that is limited and renewable, akin to strength or energy. After an act of choice or self-control, the sell's resources have been expended, producing the condition of ego depletion. In this state, the self is less able to function effectively, such as by regulating itself or exerting volition. Effects of ego depletion appear to reflect an effort to conserve remaining resources rather than full exhaustion, although in principle full exhaustion is possible. This versatile but limited resource is crucial to the self's optimal functioning, and the pervasive need to conserve it may result in the commonly heavy reliance on habit, routine, and automatic processes.