In psychoanalytic theory, reaction formation () is a defense mechanism in which emotions and impulses which are anxiety-producing or perceived to be unacceptable are mastered by exaggeration of the directly opposing tendency. The reaction formations belong to Level 3 of neurotic defense mechanisms, which also include dissociation, displacement, intellectualization, and repression. Theory Reaction formation depends on the hypothesis that "[t]he instincts and their derivatives may be arranged as pairs of opposites: life versus death, construction versus destruction, action versus passivity, dominance versus submission, and so forth. When one of the instincts produces anxiety by exerting pressure on the ego either directly or by way of the superego, the ego may try to sidetrack the offending impulse by concentrating upon its opposite. For example, if feelings of hate towards another person make one anxious, the ego can facilitate the flow of love to conceal the hostility." Where reaction-formation takes place, it is usually assumed that the original, rejected impulse does not vanish, but persists, unconscious, in its original infantile form. Thus, where love is experienced as a reaction formation against hate, we cannot say that love is substituted for hate, because the original aggressive feelings still exist underneath the affectionate exterior that merely masks the hate to hide it from awareness. In a diagnostic setting, the existence of a reaction-formation rather than a 'simple' emotion would be suspected where exaggeration, compulsiveness and inflexibility were observed. For example, "[r]eactive love protests too much; it is overdone, extravagant, showy, and affected. It is counterfeit, and [...] is usually easily detected. Another feature of a reaction formation is its compulsiveness. A person who is defending himself against anxiety cannot deviate from expressing the opposite of what he really feels. His love, for instance, is not flexible. It cannot adapt itself to changing circumstances as genuine emotions do; rather it must be constantly on display as if any failure to exhibit it would cause the contrary feeling to come to the surface. Reaction formation is sometimes described as one of the most difficult defenses for lay people to understand; this testifies not merely to its effectiveness as a disguise, but also to its ubiquity and flexibility as a defense that can be utilized in many forms. For example, "solicitude may be a reaction-formation against cruelty, cleanliness against coprophilia", and it is not unknown for an analyst to explain a client's unconditional pacifism as a reaction