Theory suggests that stimulus evaluations automatically evoke approach–avoidance behavior. However, the extent to which approach–avoidance behavior is triggered automatically is not yet clear. Furthermore, the nature of automatically triggered approach–avoidance behavior is controversial. We review research on two views on the type of approach–avoidance behavior that is triggered automatically (arm flexion/extension, distance change). Present evidence supports the distance-change view and corroborates the notion of an automatic pathway from evaluation to distance-change behavior. We discuss underlying mechanisms (direct stimulus–response links, outcome anticipations, (...) goals) as well as implications regarding the flexibility of the evaluation–behavior link. (shrink)

Ainslie's account of willpower addresses many important mechanisms. We argue that a model of willpower should be grounded in general psychological principles and with a primary focus on their interplay. We discuss the reflective-impulsive model that covers willpower and impulsiveness as special constellations of processes that govern various forms of cognition and behavior.

The model of addiction proposed by Redish et al. shows a lack of fit with recent data and models in psychological studies of addiction. In these dual process models, relatively automatic appetitive processes are distinguished from explicit goal-directed expectancies and motives, whereas these are all grouped together in the planning system in the Redish et al. model. Implications are discussed.