| delusions | A false belief regarding the self or persons or objects outside the self that persists despite the facts, and is not considered tenable by one's associates. (12 Dec 1998) |
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| grandiose delusions | A fixed false belief that involves themes of special powers or abilities (for example communicating with deceased relatives or extraterrestrial) (27 Sep 1997) |
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| organic delusions | False beliefs experienced in the delirium associated with dementia in conjunction with traumatic injury to the brain, or an organic change in the brain such as in Alzheimer's syndrome, or in cocaine or other drug intoxication. (05 Mar 2000) |