Reactance is a motivational reaction to offers, persons, rules, or regulations that threaten or eliminate specific behavioral freedoms. Reactance occurs when a person feels that someone or something is taking away his or her choices or limiting the range of alternatives.
Reactances can occur when someone is heavily pressured to accept a certain view or attitude. Reactance can cause the person to adopt or strengthen a view or attitude that is contrary to what was intended, and also increases resistance to persuasion. People using reverse psychology are playing on at least an informal awareness of reactance, attempting to influence someone to choose the opposite of what they request.
Psychological reactance occurs in response to threats to perceived behavioral freedoms. An example of such behavior can be observed when an individual engages in a prohibited activity in order to deliberately taunt the authority who prohibits it, regardless of the utility or disutility that the activity confers. An individual's freedom to select when and how to conduct their behavior, and the level to which they are aware of the relevant freedom—and are able to determine behaviors necessary to satisfy that freedom—affect the generation of psychological reactance. It is assumed that if a person's behavioral freedom is threatened or reduced, they become motivationally aroused. The fear of loss of further freedoms can spark this arousal and motivate them to re-establish the threatened freedom. Because this motivational state is a result of the perceived reduction of one's freedom of action, it is considered a counterforce, and thus is called "psychological reactance".
There are four important elements to reactance theory: perceived freedom, threat to freedom, reactance, and restoration of freedom. Freedom is not an abstract consideration, but rather a feeling associated with real behaviors, including actions, emotions, and attitudes.
Reactance also explains denial as it is encountered in addiction counselling. According to William R. Miller, "Research demonstrates that a counselor can drive resistance (denial) levels up and down dramatically according to his or her personal counseling style". Use of a "respectful, reflective approach" described in motivational interviewing and applied as motivation enhancement therapy, rather than by argumentation, the accusation of "being in denial", and direct confrontations, lead to the motivation to change and avoid the resistance and denial, or reactance, elicited by strong direct confrontation. For a complete review of how confrontation became popular in addiction treatment, see Miller, W.R. & White, W.