Regan MacNeil is the central character in 'The Exorcist', a young girl who becomes possessed by a demonic entity and undergoes a terrifying transformation.

The narrator in 'The Tell-Tale Heart' is driven by an intense fear of the old man's 'vulture eye', which he believes is constantly watching him.

Symbolism is frequently employed in possession stories to create a deeper layer of meaning and evoke psychological horror. Symbolic elements can represent the struggle between good and evil, the loss of control, or the protagonist's inner turmoil.

The Overlook Hotel is the setting for the film 'The Shining', where the Torrance family encounters a series of disturbing and terrifying events.

The novel 'The Haunting of Hill House' delves into the theme of isolation, as the characters find themselves trapped in a secluded mansion haunted by malevolent forces.

The Grahams are the family at the center of the film 'Hereditary', who are haunted by a dark and disturbing generational curse.

Dissociation, a psychological phenomenon involving a detachment from reality, is frequently explored in possession stories to create a heightened sense of horror and psychological distress.

Damien Karras is the priest who is tasked with performing the exorcism on Regan MacNeil in 'The Exorcist'.

Edgar Allan Poe's short story 'The Tell-Tale Heart' delves into the psychological effects of guilt and paranoia, as the narrator becomes increasingly obsessed with hiding his crime.

The Perrons are the family who move into a haunted farmhouse in Rhode Island in the film 'The Conjuring'.

Ambiguity is a literary device commonly employed in possession stories to create a sense of unease and uncertainty. By leaving certain elements open to interpretation, authors can heighten the psychological horror and keep readers on edge.

Pazuzu is the ancient Assyrian demon that possesses Regan MacNeil in 'The Exorcist'.

Dissociative identity disorder is a psychological disorder in which a person experiences a loss of personal identity and a sense of unreality.

The Babadook is the name of the mysterious entity that haunts the protagonist and her son in the film 'The Babadook'.

The loss of control is a psychological concept frequently explored in possession stories to create a sense of vulnerability and helplessness. The protagonist's inability to control their own body or mind can be deeply unsettling and terrifying.