delusion

(noun)

A false belief that is resistant to confrontation with actual facts.

Related Terms

  • flat affect
  • hallucination
  • catatonia
  • neurotransmitters
  • neurotransmitter
  • dopamine

(noun)

A belief held with strong conviction despite superior evidence to the contrary.

Related Terms

  • flat affect
  • hallucination
  • catatonia
  • neurotransmitters
  • neurotransmitter
  • dopamine

Examples of delusion in the following topics:

  • The Schizophrenia Spectrum

    • If delusions or hallucinations or severe, only one symptom may be sufficient for diagnosis.
    • Jealous type: Delusion that the individual's sexual partner is unfaithful when such is not the case.
    • Somatic type: Delusion that the person has some physical defect or medical condition.
    • Mixed type: Delusions with characteristics of more than one of the above types but with no single predominant theme.
    • Unspecified type: Delusions that cannot be clearly classified into any of the subcategories.
  • Introduction to Schizophrenia and Psychosis

    • Examples include hallucinations, delusions, and bizarre or disorganized behavior.
    • Delusions are also commonly experienced; they include false beliefs that are not of the culture of the individual and are unchanging even after being proven incorrect.
  • World War II

    • In a 1940 speech, Roosevelt argued, "Some, indeed, still hold to the now somewhat obvious delusion that we … can safely permit the United States to become a lone island … in a world dominated by the philosophy of force. " A national survey found that in the summer of 1940, 67% of Americans believed that a German-Italian victory would endanger the United States, that if such an event occurred 88% supported "arm[ing] to the teeth at any expense to be prepared for any trouble", and that 71% favored "the immediate adoption of compulsory military training for all young men."
  • Introduction to Sleep

    • We also know that extended sleeplessness can lead to hallucinations, delusions, loss of immune function, and in extreme cases, death.
  • Neurodevelopmental Disorders: Mental Illnesses

    • They can include delusions, disordered thoughts and speech, and tactile, auditory, visual, olfactory and gustatory hallucinations, typically regarded as manifestations of psychosis.
  • Etiology of Schizophrenia

    • It is characterized by a wide variety of symptoms that include both positive symptoms (such as hallucinations and delusions) and negative symptoms (such as lack of emotion or motor control).
  • Postwar Isolationism

    • In a 1940 speech, Roosevelt argued, "Some, indeed, still hold to the now somewhat obvious delusion that we … can safely permit the United States to become a lone island … in a world dominated by the philosophy of force." 
  • Buddhism

    • Sitting under what became known as the Bodhi Tree, Siddhartha discovered what Buddhists call the Noble Eightfold Path, and attained Buddhatva, or Enlightenment, which is said to be a state of being completely free of lust (raga), hatred (dosa), and delusion (moha).
  • The United Kingdom and Appeasement

    • , under the delusion that we would join her in defense of Czechoslovakia.
  • American Isolationism

    • In a 1940 speech, Roosevelt argued, "Some, indeed, still hold to the now somewhat obvious delusion that we … can safely permit the United States to become a lone island … in a world dominated by the philosophy of force."
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