If you see your teacher morph into a dancing elephant, chances are you’re having a hallucination, or an illusory perception. In other words, it sounds like you are seeing things!
A person experiencing a hallucination perceives things that aren’t really there. A hallucination can involve any of the senses — including sight, hearing, touch, smell, and taste — and often results from a mental disorder or a chemical source, such as a drug.
n illusory perception; a common symptom of severe mental disorder
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acousma, auditory hallucination
illusory auditory perception of strange nonverbal sounds
an image vivid enough to be a hallucination but recognized as unreal
illusory visual perception
hallucinatory perception of colored lights
any visual hallucination arising from heavy drinking
visual hallucination of animals; sometimes occurring in delirium tremens