Delusion

For other uses, see Delusion (disambiguation).
"Delusionism" redirects here. For Wikipedia delusionism (also known as "inletionism"), see meta:delusionism.
Delusion
Classification and external resources
Specialty Psychiatry
ICD-10 F22
ICD-9-CM 297
DiseasesDB 33439
MeSH D003702

A delusion is a belief, out of keeping with the individual's cultural origins, that is held with strong conviction despite superior evidence to the contrary. As a pathology, it is distinct from a belief based on false or incomplete information, confabulation, dogma, illusion, or other effects of perception.

Delusions typically occur in the context of neurological or mental illness, although they are not tied to any particular disease and have been found to occur in the context of many pathological states (both physical and mental). However, they are of particular diagnostic importance in psychotic disorders including schizophrenia, paraphrenia, manic episodes of bipolar disorder, and psychotic depression.

Definition

Although non-specific concepts of madness have been around for several thousand years, the psychiatrist and philosopher Karl Jaspers was the first to define the three main criteria for a belief to be considered delusional in his 1913 book General Psychopathology.[1] These criteria are:

Furthermore, when a false belief involves a value judgment, it is only considered a delusion if it is so extreme that it cannot be, or never can be proven true. For example: a man claiming that he flew into the sun and flew back home. This would be considered a delusion,[3] unless he were speaking figuratively.

Types

Delusions are categorized into four different groups:

Themes

In addition to these categories, delusions often manifest according to a consistent theme. Although delusions can have any theme, certain themes are more common. Some of the more common delusion themes are:

Grandiose delusions

Main article: Grandiose delusions

Grandiose delusions are distinct from grandiosity, in that the sufferer does not have insight into their loss of touch with reality. An individual is convinced they have special powers, talents, or abilities. Sometimes, the individual may actually believe they are a famous person or character.

Grandiose delusions or delusions of grandeur are principally a subtype of delusional disorder but could possibly feature as a symptom of schizophrenia and manic episodes of bipolar disorder.[11] Grandiose delusions are characterized by fantastical beliefs that one is famous, omnipotent or otherwise very powerful. The delusions are generally fantastic, often with a supernatural, science-fictional, or religious bent. In colloquial usage, one who overestimates one's own abilities, talents, stature or situation is sometimes said to have "delusions of grandeur". This is generally due to excessive pride, rather than any actual delusions. Grandiose delusions or delusions of grandeur can also be associated with megalomania.

Persecutory delusions

Main article: Persecutory delusion

Persecutory delusions are the most common type of delusions and involve the theme of being followed, harassed, cheated, poisoned or drugged, conspired against, spied on, attacked, or otherwise obstructed in the pursuit of goals. Persecutory delusions are a condition in which the affected person wrongly believes that they are being persecuted. Specifically, they have been defined as containing three central elements:[12] The individual thinks that

  1. harm is occurring, or is going to occur.
  2. the persecutor(s) has(have) the intention to cause harm.
  3. they are constantly being prejudged or profiled.

According to the DSM-IV-TR, persecutory delusions are the most common form of delusions in schizophrenia, where the person believes they are "being tormented, followed, sabotaged, tricked, spied on, or ridiculed."[13] In the DSM-IV-TR, persecutory delusions are the main feature of the persecutory type of delusional disorder. When the focus is to remedy some injustice by legal action, they are sometimes called "querulous paranoia".[14]

Diagnosis

John Haslam illustrated this picture of a machine described by James Tilly Matthews called an "air loom," which Matthews believed was being used to torture him and others for political purposes.

The modern definition and Jaspers' original criteria have been criticised, as counter-examples can be shown for every defining feature.

Studies on psychiatric patients show that delusions vary in intensity and conviction over time, which suggests that certainty and incorrigibility are not necessary components of a delusional belief.[15]

Delusions do not necessarily have to be false or 'incorrect inferences about external reality'.[16] Some religious or spiritual beliefs by their nature may not be falsifiable, and hence cannot be described as false or incorrect, no matter whether the person holding these beliefs was diagnosed as delusional or not.[17]

In other situations the delusion may turn out to be true belief.[18] For example, delusional jealousy, where a person believes that their partner is being unfaithful (and may even follow them into the bathroom believing them to be seeing their lover even during the briefest of partings) actually be true that the partner is having sexual relations with another person. In this case the delusion does not cease to be a delusion because the content later turns out to be verified as true or the partner actually chose to engage in the behavior of which they were being accused.

In other cases, the delusion may be assumed to be false by a doctor or psychiatrist assessing the belief, because it seems to be unlikely, bizarre or held with excessive conviction. Psychiatrists rarely have the time or resources to check the validity of a person’s claims leading to some true beliefs to be erroneously classified as delusional.[19] This is known as the Martha Mitchell effect, after the wife of the attorney general who alleged that illegal activity was taking place in the White House. At the time her claims were thought to be signs of mental illness, and only after the Watergate scandal broke was she proved right (and hence sane).

Similar factors have led to criticisms of Jaspers' definition of true delusions as being ultimately 'un-understandable'. Critics (such as R. D. Laing) have argued that this leads to the diagnosis of delusions being based on the subjective understanding of a particular psychiatrist, who may not have access to all the information that might make a belief otherwise interpretable. R.D. Laing's hypothesis has been applied to some forms of projective therapy to "fix" a delusional system so that it cannot be altered by the patient. Psychiatric researchers at Yale University, Ohio State University and the Community Mental Health Center of Middle Georgia have used novels and motion picture films as the focus. Texts, plots and cinematography are discussed and the delusions approached tangentially.[20] This use of fiction to decrease the malleability of a delusion was employed in a joint project by science-fiction author Philip Jose Farmer and Yale psychiatrist A. James Giannini. They wrote the novel Red Orc's Rage, which, recursively, deals with delusional adolescents who are treated with a form of projective therapy. In this novel's fictional setting other novels written by Farmer are discussed and the characters are symbolically integrated into the delusions of fictional patients. This particular novel was then applied to real-life clinical settings.[21]

Another difficulty with the diagnosis of delusions is that almost all of these features can be found in "normal" beliefs. Many religious beliefs hold exactly the same features, yet are not universally considered delusional. These factors have led the psychiatrist Anthony David to note that "there is no acceptable (rather than accepted) definition of a delusion."[22] In practice, psychiatrists tend to diagnose a belief as delusional if it is either patently bizarre, causing significant distress, or excessively pre-occupying the patient, especially if the person is subsequently unswayed in belief by counter-evidence or reasonable arguments.

It is important to distinguish true delusions from other symptoms such as anxiety, fear, or paranoia. To diagnose delusions a mental state examination may be used. This test includes appearance, mood, affect, behavior, rate and continuity of speech, evidence of hallucinations or abnormal beliefs, thought content, orientation to time, place and person, attention and concentration, insight and judgment, as well as short-term memory.[23]

Johnson-Laird suggests that delusions may be viewed as the natural consequence of failure to distinguish conceptual relevance. That is, the person takes irrelevant information and puts it in the form of disconnected experiences, then it is taken to be relevant in a manner that suggests false causal connections. Furthermore, the person takes the relevant information, in the form of counterexamples, and ignores it.[24]

Development of specific delusions

The top two factors mainly concerned in the germination of delusions are: 1. Disorder of brain functioning; and 2. background influences of temperament and personality.[25]

Higher levels of dopamine qualify as a symptom of disorders of brain function. That they are needed to sustain certain delusions was examined by a preliminary study on delusional disorder (a psychotic syndrome) instigated to clarify if schizophrenia had a dopamine psychosis.[26] There were positive results - delusions of jealousy and persecution had different levels of dopamine metabolite HVA and homovanillyl alcohol (which may have been genetic). These can be only regarded as tentative results; the study called for future research with a larger population.

It is too simplistic to say that a certain measure of dopamine will bring about a specific delusion. Studies show age[27][28] and gender to be influential and it is most likely that HVA levels change during the life course of some syndromes.[29]

On the influence personality, it has been said: "Jaspers considered there is a subtle change in personality due to the illness itself; and this creates the condition for the development of the delusional atmosphere in which the delusional intuition arises."[30]

Cultural factors have "a decisive influence in shaping delusions".[31] For example, delusions of guilt and punishment are frequent in a Western, Christian country like Austria, but not in Pakistan - where it is more likely persecution.[32] Similarly, in a series of case studies, delusions of guilt and punishment were found in Austrian patients with Parkinson's being treated with l-dopa - a dopamine agonist.[33]

Causes

Explaining the causes of delusions continues to be challenging and several theories have been developed. One is the genetic or biological theory, which states that close relatives of people with delusional disorder are at increased risk of delusional traits. Another theory is the dysfunctional cognitive processing, which states that delusions may arise from distorted ways people have of explaining life to themselves. A third theory is called motivated or defensive delusions. This one states that some of those persons who are predisposed might suffer the onset of delusional disorder in those moments when coping with life and maintaining high self-esteem becomes a significant challenge. In this case, the person views others as the cause of their personal difficulties in order to preserve a positive self-view.[34]

This condition is more common among people who have poor hearing or sight. Also, ongoing stressors have been associated with a higher possibility of developing delusions. Examples of such stressors are immigration or low socio-economic status.

In popular culture

Love, Chunibyo & Other Delusions is an anime about two high school students who suffer from delusions.

See also

References

  1. ↑ Jaspers, Karl (1913). Allgemeine Psychopathologie. Ein Leitfaden für Studierende, Ärzte und Psychologen. Berlin: J. Springer.
  2. ↑ Jaspers 1997, p. 106
  3. ↑ "Terms in the Field of Psychiatry and Neurology". Retrieved 6 August 2010.
  4. ↑ Diagnostic and statistical manual of mental disorders: DSM-5. American Psychiatric Association. 2013.
  5. 1 2 3 4 5 6 7 8 9 Source: http://www.minddisorders.com/Br-Del/Delusions.html
  6. ↑ Berrios G.E., Luque R. (1995). "Cotard Syndrome: clinical analysis of 100 cases". Acta Psychiatrica Scandinavica 91 (3): 185–188. doi:10.1111/j.1600-0447.1995.tb09764.x. PMID 7625193.
  7. ↑ "Religious delusions are common symptoms of schizophrenia.". Retrieved 17 April 2011.
  8. ↑ M, Raja. "Religious delusion" (PDF). Retrieved 17 April 2011.
  9. ↑ "Difference between delusion and phobia". Retrieved 6 August 2010.
  10. ↑ Barker, P. 1997. Assessment in Psychiatric and Mental Health Nursing in Search of the Whole Person. UK: Nelson Thornes Ltd. P241.
  11. ↑ Diagnostic and Statistical Manual of Mental Disorders Fourth edition Text Revision (DSM-IV-TR) American Psychiatric Association (2000)
  12. ↑ Freeman, D. & Garety, P.A. (2004) Paranoia: The Psychology of Persecutory Delusions. Hove: PsychoIogy Press. ISBN 1-84169-522-X
  13. ↑ Diagnostic and statistical manual of mental disorders: DSM-IV. Washington, DC: American Psychiatric Association. 2000. p. 299. ISBN 0-89042-025-4.
  14. ↑ Diagnostic and statistical manual of mental disorders: DSM-IV. Washington, DC: American Psychiatric Association. 2000. p. 325. ISBN 0-89042-025-4.
  15. ↑ Myin-Germeys I, Nicolson NA, Delespaul PA (April 2001). "The context of delusional experiences in the daily life of patients with schizophrenia". Psychol Med 31 (3): 489–98. doi:10.1017/s0033291701003646. PMID 11305857.
  16. ↑ Spitzer M (1990). "On defining delusions". Compr Psychiatry 31 (5): 377–97. doi:10.1016/0010-440X(90)90023-L. PMID 2225797.
  17. ↑ Young, A.W. (2000). "Wondrous strange: The neuropsychology of abnormal beliefs". In Coltheart M., Davis M. Pathologies of belief. Oxford: Blackwell. pp. 47–74. ISBN 0-631-22136-0.
  18. ↑ Jones E (1999). "The phenomenology of abnormal belief". Philosophy, Psychiatry and Psychology 6: 1–16.
  19. ↑ Maher B.A. (1988). "Anomalous experience and delusional thinking: The logic of explanations". In Oltmanns T., Maher B. Delusional Beliefs. New York: Wiley Interscience. ISBN 0-471-83635-4.
  20. ↑ Giannini AJ (2001). "Use of fiction in therapy". Psychiatric Times 18 (7): 56.
  21. ↑ AJ Giannini. Afterword. (in) PJ Farmer. Red Orc's Rage.NY, Tor Books, 1991, pp.279-282.
  22. ↑ David AS (1999). "On the impossibility of defining delusions". Philosophy, Psychiatry and Psychology 6 (1): 17–20.
  23. ↑ "Diagnostic Test List for Delusions". Retrieved 6 August 2010.
  24. ↑ "A New Definition of Delusional Ideation in Terms of Model Restriction". Retrieved 6 August 2010.
  25. ↑ Sims, Andrew (2002). Symptoms in the mind: an introduction to descriptive psychopathology. Philadelphia: W. B. Saunders. p. 127. ISBN 0-7020-2627-1.
  26. ↑ Morimoto K, Miyatake R, Nakamura M, Watanabe T, Hirao T, Suwaki H (June 2002). "Delusional disorder: molecular genetic evidence for dopamine psychosis". Neuropsychopharmacology 26 (6): 794–801. doi:10.1016/S0893-133X(01)00421-3. PMID 12007750.
  27. ↑ Mazure CM, Bowers MB (1 February 1998). "Pretreatment plasma HVA predicts neuroleptic response in manic psychosis". Journal of Affective Disorders 48 (1): 83–6. doi:10.1016/S0165-0327(97)00159-6. PMID 9495606.
  28. ↑ Yamada N, Nakajima S, Noguchi T (February 1998). "Age at onset of delusional disorder is dependent on the delusional theme". Acta Psychiatrica Scandinavica 97 (2): 122–4. doi:10.1111/j.1600-0447.1998.tb09973.x. PMID 9517905.
  29. ↑ Tamplin A, Goodyer IM, Herbert J (1 February 1998). "Family functioning and parent general health in families of adolescents with major depressive disorder". Journal of Affective Disorders 48 (1): 1–13. doi:10.1016/S0165-0327(97)00105-5. PMID 9495597.
  30. ↑ Sims, Andrew (2002). Symptoms in the mind: an introduction to descriptive psychopathology. Philadelphia: W. B. Saunders. p. 128. ISBN 0-7020-2627-1.
  31. ↑ Draguns JG, Tanaka-Matsumi J (July 2003). "Assessment of psychopathology across and within cultures: issues and findings". Behav Res Ther 41 (7): 755–76. doi:10.1016/S0005-7967(02)00190-0. PMID 12781244.
  32. ↑ Stompe T, Friedman A, Ortwein G, et al. (1999). "Comparison of delusions among schizophrenics in Austria and in Pakistan". Psychopathology 32 (5): 225–34. doi:10.1159/000029094. PMID 10494061.
  33. ↑ Birkmayer W, Danielczyk W, Neumayer E, Riederer P (1972). "The balance of biogenic amines as condition for normal behaviour" (PDF). J. Neural Transm. 33 (2): 163–78. doi:10.1007/BF01260902. PMID 4643007.
  34. ↑ "Delusional Disorder". Retrieved 6 August 2010.
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