The narrator could be suffering from schizophrenia, a mental illness that prevents a person from understanding reality as it should be. Delusions, hallucinations, sadness, hearing voices, anger, paranoia, and other symptoms might be present. The raven is a hallucination in the poem.
The two signs indicate he has disorganised schizophrenia. The narrator's disordered speech and behaviour are indicative of this condition. Because of this condition, the narrator murders, dismembers, and dumps the elderly man before confessing to the crime.
In Edgar Allan Poe's "The Raven," the narrator suffers from insanity and is plagued by the bird's presence.
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