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A 31-year-old member asked:

What causes illusions, delusions, and hallucinations?

1 doctor answer3 doctors weighed in
Dr. Steven Griggs
Clinical Psychology 39 years experience
Illusions are simple: perceptual distortions, seeing things that aren't there because of low lighting, atmospheric distortion, etc. Once light is shined on the cause, the illusion disappears. Delusions are fixed patterns of thought that do not respond to reality. Hallucinations are psychotic manifestations that have little to do with reality. The latter two are usually brought on by drugs or mental illness.

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A 19-year-old member asked:

What is the difference between delusion, illusion, and hallucination?

5 doctor answers11 doctors weighed in
Dr. Douglas Bey
Psychiatry 57 years experience
Stimulus: Hallucination is a false perception while an illusion is a misperceptions of a real stimulus--hearing voices with no stimulus is a hallucination misinterpreting the sound of the radiator as voices is an illusion.
Dr. Douglas Bey
Dr. Douglas Bey commented
Psychiatry 57 years experience
Provided original answer
Delusion is a false belief that isn't altered by logic.
Feb 26, 2015

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