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false belief based upon a misinterpretation of reality. It is not, like a hallucination, a false sensory perception, or like an illusion, a distorted perception. Delusions vary in intensity, and are not uncommon among substance abusers, particularly those who use amphetamines, cocaine, and hallucinogens. They also occur frequently among individuals who have been diagnosed with Alzheimer's diseaseAlzheimer's disease
, degenerative disease of nerve cells in the cerebral cortex that leads to atrophy of the brain and senile dementia and, ultimately, death. The disease is characterized by abnormal accumulation of plaques and by neurofibrillary tangles (malformed nerve
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, Huntington's diseaseHuntington's disease,
hereditary, acute disturbance of the central nervous system usually beginning in middle age and characterized by involuntary muscular movements and progressive intellectual deterioration; formerly called Huntington's chorea.
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, or schizophreniaschizophrenia
, group of severe mental disorders characterized by reality distortions resulting in unusual thought patterns and behaviors. Because there is often little or no logical relationship between the thoughts and feelings of a person with schizophrenia, the disorder has
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, and during the manic stage of bipolar disorder (see depressiondepression,
in psychiatry, a symptom of mood disorder characterized by intense feelings of loss, sadness, hopelessness, failure, and rejection. The two major types of mood disorder are unipolar disorder, also called major depression, and bipolar disorder, whose sufferers are
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). Some common delusions include persecutory delusions, in which the individual falsely believes that others are plotting against him; delusions of thought broadcasting, where the individual believes his thoughts can be transmitted to others; delusions of thought insertion, in which the individual believes that thoughts are being implanted in his mind; and delusions of grandeur, in which the individual imagines himself an unappreciated person of great importance.


A conviction based on faulty perceptions, feelings, and thinking.


Borkman, John Gabriel
suffers from delusions of power. [Nor. Lit.: John Gabriel Borkman]
Bowles, Sally
night-club entertainer thinks she has the makings of a great film actress. [Br. Lit.: Isherwood Berlin Stories in Drabble, 498]
Clamence, Jean-Baptiste
living with his own good and evil. [Fr. Lit.: The Fall]
Dubois, Blanche
felt she and Mitch were above others. [Am. Lit.: A Streetcar Named Desire]
Jones, Brutus
self-styled island emperor experiences traumatic visions. [Am. Lit.: Emperor Jones]
Lockit, Lucy
steals jailer-father’s keys to free phony husband. [Br. Lit.: The Beggar’s Opera]
Pan, Peter
little boy, refuses to grow up; resides in Never Never Land. [Children’s Lit.: Peter Pan]
opium of the people
Marx’s classic metaphor for religion. [Ger. Hist.: Critique of Hegel’s “Philosophy of Right”]
hides head, thinking itself concealed. [Animal Symbolism: Brewer Dictionary, 788]


Psychiatry a belief held in the face of evidence to the contrary, that is resistant to all reason
References in periodicals archive ?
Some middle school students chose to do all three and learn to manage their time in the process to maintain good grades, says DeLude.
DeLude, a Waianae native, is proud that the school attracts students from all corners of Oahu, with one fourth of its student body on financial aid.
Delude, in her 29 years at the Westboro Public Library, including the last 27 as library director, has overseen the modernization of the library.
Delude said the Westboro library got through the summer, in large part, with the help of volunteers.
Prior to joining Bank of Vancouver in 1998, DeLude was regional manager for the Portland, Salem and Eugene region of Western Bank, a division of Washington Mutual, for five years.
WESTBORO - The Westboro Public Library debuted wireless Internet service in January and, according to Library Director Carolyn Delude, the library has seen an increase in the number of residents, especially students, using the free service.
According to Ron Delude, Sanders B-1B DSUP program manager, "We are pleased to be part of the DSUP team which will provide the B-1B with full RF self-protection against all modern threats well into the next century.
The beauty of it is you don't have to wait for a library computer," library director Carolyn Delude said.
The company still has critics--some of them within Travelers--who claim its agents delude unwary customers and damage the reputation of the life insurance industry.
I don't think that we delude ourselves into thinking that just putting the healthful snacks out there will solve the problem,'' said Dr.