Hallucination

A Hallucination is a visual, verbal or physical illusion that a person sees, hears or feels and mistakes for reality. These occur while under the influence of a substance; illegal drugs or combinations of drugs, or as a result of some mental illnesses. These illusions range from benign (harmless, but confusing) to frightening or even demanding (command hallucinations) where a person may believe that they are receiving instructions to harm themselves or others. Hallucinations associated with mental illness can often be controlled through appropriate medications.

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History of Psychology
History of Psychology