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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 ?
According to Delude WiFi is available throughout the library, including in the children's reading area, meeting and reading rooms.
We first presented the idea of having wireless Internet capability to the Finance Committee last year and they could all see the value in offering this service," Delude said.
The money for the WiFi work was approved at the 2007 annual town meeting and Delude said, the Internet "hot spot" access points and other work performed by C/WMARS was completed in January.
Another advantage of WiFi would be if a teacher tutoring a student needs to use the Internet for reference, and now this allows them to do it in one of the study areas," Delude said.
Delude said while there are concerns of people taking advantage of the Internet capability, she doesn't foresee people using it inappropriately.
We have no reason to assume that people will not use this service only with the best of reasons, but the good news is that we still are a small library and if someone is not using the system appropriately there's really no area which is not far from a staff person," Delude said.
Delude didn't always know she would be a librarian; her first career was as a social worker.
Delude said the Westboro library got through the summer, in large part, with the help of volunteers.
Delude credits the support of the town and town manager.
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.
We were very pleased when Ron DeLude joined us at Bank of Vancouver, and we are delighted that he has agreed to take on these additional responsibilities.