The uncanny states,—depersonalization, derealization, estrangement, and déjà vu phenomena,—are of a generic group. In depersonalization there is a feeling, accompanied by anxiety or fear, of being changed in regard to awareness of the self or the outside world. This sense of alienation most frequently occurs in adults with depressive reactions, though they may be present in other psychoses or neuroses. Genetically, these stem from a basic disturbance in body ego perceptions and feelings. There are a high degree of narcissism, increased dependency feelings, and vulnerability to separation anxiety and object loss. There is a weakened ego identity. Denial is the most prominent defense mechanism. Depersonalization is a denial of a portion of the ego; derealization, denial of a portion of the outside world. Anxiety in these states is evidence of the failure of denial, usually of denial of hostility. After this failure, it is reinvolved and manifests itself as the uncanny feeling.