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Definition of Illusion

Illusion: A perception that occurs when a sensory stimulus is present but is incorrectly perceived and misinterpreted, such as hearing the wind as someone crying. Everyone may occasionally experience an illusion. However, illusions are extraordinarily common in people suffering from schizophrenia.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=26292
Last Editorial Review: 6/14/2012

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