There are experiences in which one experiences their facial expressions, gestures, voice as belonging to someone else. Usually, it is someone with negative characteristics. Common are feelings of the victim, or feelings of invasion from outside or external control. These external forces are usually experienced as malevolent, hostile and disturbing. Sometimes we are talking about "hitchhikers" inside us. We often encounter a distinct component of "voices".
The mechanism of this unusual and difficult-to-understand phenomenon is the separation of a certain part of the Self and its suppression into the unconscious. This separation differs in degree and is usually distinguished on a continuum from dissociative states to the so-called "multiple personalities". Obsessions are the result of painful traumatic life experiences, most often childhood abuse, and are considered a creative form of coping with a difficult situation to overcome.
Additional information about this category /quotes from the book: Grof, Stanislav. Grof, Christina. Crisis of spiritual development. Prague: Chvojka Publishing, 1999. ISBN 80-86183-09-2/
Individuals experiencing this type of transpersonal crisis have a clear sense that their soul and body have been engulfed and are controlled by a being or energy characterized by personal characteristics. They perceive it as a hostile and disturbing element entering into their personality from outside. They seem to be attacked and confused by a being without a body, a demonic creature, or an evil man who has captured them through black magic or witchcraft. This condition manifests itself in many different types and degrees. Sometimes the true nature of the disorder remains hidden. It is characterized by serious psychopathological manifestations such as antisocial, even illegal, murderous aggression, or even self-destructive behavior, suicide depression, sexual promiscuity, and deviance, or alcohol and drug abuse. Only after the start of experiential psychotherapy is the person's "obsession" identified as the basis of the problems mentioned. Giving the situation a free flow, the whole session will be reminiscent of the exorcism in the Catholic Church or the rituals of exorcising evil spirits in various indigenous cultures. The solution often comes after dramatic episodes of choking, severe vomiting, feverish physical activity, or even temporary loss of control. These conditions can be extremely healing and transformative and often result in the profound spiritual conversion of the person concerned. In an extreme case, such a situation emerges completely spontaneously in everyday life - in the same form as in experiential sessions. At that time, the person is usually scared extremely, and he/she feels desperate alone: relatives, friends and often therapists tend to condemn him/her. They often react to the behavior of such an obsessed individual with a strange mixture of metaphysical fear and moral condemnation. They often label him/her as a mediator of evil forces and refuse any further contact with him/her. Despite the fact that this state is associated with many repulsive behaviors and negative energy, it clearly belongs to the category of spiritual crisis. The demonic archetype is inherently transpersonal because it represents a negative mirror image of the divine. It often appears to be a "threshold phenomenon" comparable to the role of deterrent guardians of Oriental temple gates: it prevents access to a deeper spiritual reality that usually emerges after successfully overcoming a state of obsession. With the help of a person who cannot be intimidated by the unusual nature of this condition and who is able to support his/her full manifestation in consciousness, the negative energy can be dissipated so that remarkable healing occurs. Wilson van Dusen's works provide more detailed information on the states of obsession perceived as an invasion of evil spirits.