Groups the phenomena of the psychology atlas that name one of the unconscious defense mechanisms first classified within psychoanalytic theory, the strategies a mind uses to keep an unacceptable thought, desire or impulse from causing conscious anxiety. Belongs here: repression, denial, projection, reaction formation, regression, rationalization, sublimation, displacement, compartmentalization and intellectualization, each a distinct way the mind manages material it finds unacceptable rather than a bias in judgment, a memory effect or a social or developmental phenomenon. A phenomenon whose central finding concerns a judgment bias, a memory distortion, a group or social effect, a perceptual distortion or a developmental stage belongs in one of the atlas own other groups instead.