Changes: Folie à deux

**Folie à deux**
ICD-10	F24
ICD-9	297.3
OMIM	[1]
DiseasesDB	34350
MedlinePlus	[2]
eMedicine	med/3352
MeSH	{{{MeshNumber}}}

Latest revision as of 08:04, 23 December 2007

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Folie à deux (literally, "a madness shared by two") is a rare psychiatric syndrome in which a symptom of psychosis (particularly a paranoid or delusional belief) is transmitted from one individual to another. The same syndrome shared by more than two people may be called folie à trois, folie à quatre, folie en famille or even folie à plusieurs (madness of many). Recent psychiatric classifications refer to the syndrome as shared psychotic disorder (DSM-IV) (297.3) and induced delusional disorder (folie à deux) (F.24) in the ICD-10, although the research literature largely uses the original name.

Presentation

This case study is taken from Enoch and Ball's 'Uncommon Psychiatric Syndromes' (2001, p181):

Margaret and her husband Michael, both aged 34 years, were discovered to be suffering from folie à deux when they were both found to be sharing similar persecutory delusions. They believed that certain persons were entering their house, spreading dust and fluff and "wearing down their shoes". Both had, in addition, other symptoms supporting a diagnosis of paranoid psychosis, which could be made independently in either case.

This syndrome is most commonly diagnosed when the two or more individuals concerned live in proximity and may be socially or physically isolated and have little interaction with other people.

Various sub-classifications of folie à deux have been proposed to describe how the delusional belief comes to be held by more than one person.

Folie imposée is where a dominant person (known as the 'primary', 'inducer' or 'principal') initially forms a delusional belief during a psychotic episode and imposes it on another person or persons (known as the 'secondary', 'acceptor' or 'associate') with the assumption that the secondary person might not have become deluded if left to their own devices. If the parties are admitted to hospital separately then the delusions in the person with the induced beliefs usually resolve without the need of medication.
Folie simultanée describes the situation where two people, considered to independently suffer from psychosis, influence the content of each other's delusions so they become identical or strikingly similar.

Folie à deux and its more populous cousins are in many ways a psychiatric curiosity. The current Diagnostic and Statistical Manual of Mental Disorders states that a person cannot be diagnosed as being delusional if the belief in question is one "ordinarily accepted by other members of the person's culture or subculture" (see entry for delusion). It is not clear at what point a belief considered to be delusional escapes from the folie à... diagnostic category and becomes legitimate because of the number of people holding it. When a large number of people may come to believe obviously false and potentially distressing things based purely on hearsay, these beliefs are not considered to be clinical delusions by the psychiatric profession and are labelled instead as mass hysteria.

Being defined as a rare pathological manifestation, folie à deux is rarely found in general psychology or social psychology text books, and is relatively unknown outside abnormal psychology, psychiatry and psychopathology.

Related phenomena

There have been reports that a similar phenomenon to folie à deux had been induced by the military incapacitating agent BZ in the late 60s, and most recently again by anthropologists in the South American rainforest consuming the hallucinogen ayahuasca (Metzner, 1999).

In the media

(1994) Heavenly Creatures is a film directed by Peter Jackson and starring Kate Winslet and Melanie Lynskey. It was set in New Zealand and inspired by a true story where two teenage girls develop a relationship so strong and peculiar that they believe the only way to stay together was to kill one of the girls' mother. These girls were thought to have folie à deux.

(1998) Folie à deux was the title of an episode from season 5 of The X-Files, aired in 1998, where Agent Mulder shares the belief with a telemarketer that employees of the telemarketing firm are monsters.

(2006) 'Folie à Deux' is the title of a short film written and directed by Devin Anderson. The film was shot in 2006 and is currently in post-production.

(2006) Folie à deux was referenced and defined in an episode from season 2 of Criminal Minds entitled "The Perfect Storm", which aired October 4, 2006 on CBS, in which a pair of serial killers kidnapped, tortured, and murdered several young women; in this episode, the primary, or dominant, perpetrator was a woman.

(2007) The film Bug portrays a folie à deux involving a man and woman who believe they are infested with government-implanted, nano-technological insects.

External links

Folie à deux episode synopsis from IMDb, the Internet Movie Database.
Folie à deux musical project from the purple forest.

This page uses Creative Commons Licensed content from Wikipedia (view authors).

@@ Line 1: / Line 1: @@
 {{ClinPsy}}
+{{Infobox_Disease |
-'''Folie à deux''' (literally "a madness shared by two") is a rare [[psychiatry|psychiatric]] syndrome in which a symptom of [[psychosis]] (particularly a [[paranoia|paranoid]] or [[delusion]]al belief) is transmitted from one individual to another. (Related to the issue of shared delusions, there have also been occasional claims of shared visual [[hallucination]]s that are near-to-exact duplicates.) The same syndrome shared by more than one person may be called '''folie à trois''', '''folie à quatre''', '''folie à famille''' or even '''folie à plusieurs''' (madness of many). Recent psychiatric classifications refer to the syndrome as '''induced delusional disorder''' ([[Diagnostic and Statistical Manual of Mental Disorders|DSM-IV]]) or '''shared psychotic disorder''' ([[International Statistical Classification of Diseases and Related Health Problems|ICD-10]]).
+  Name           = {{PAGENAME}} |
+  Image          = |
+  Caption        = |
+  DiseasesDB     = 34350 |
+  ICD10          = {{ICD10|F|24||f|20}} |
+  ICD9           = {{ICD9|297.3}} |
+  ICDO           = |
+  OMIM           = |
+  MedlinePlus    = |
+  eMedicineSubj  = med  |
+  eMedicineTopic = 3352 |
+  MeshID         = D012753 |
+}}
+'''Folie à deux''' (literally, "a madness shared by two") is a rare [[psychiatry|psychiatric]] syndrome in which a symptom of [[psychosis]] (particularly a [[paranoia|paranoid]] or [[delusion]]al belief) is transmitted from one individual to another. The same syndrome shared by more than two people may be called '''folie à trois''', '''folie à quatre''', '''folie en famille''' or even '''folie à plusieurs''' (madness of many). Recent psychiatric classifications refer to the syndrome as '''shared psychotic disorder''' ([[Diagnostic and Statistical Manual of Mental Disorders|DSM-IV]]) (297.3) and '''induced delusional disorder (folie à deux)''' (F.24) in the [[ICD|ICD-10]], although the research literature largely uses the original name.
+==Presentation==
 This case study is taken from Enoch and Ball's 'Uncommon Psychiatric Syndromes' (2001, p181):
-:Margaret and her husband Michael, both aged 34 years, were discovered to be suffering from ''folie à deux'' when they were both found to be sharing similar persecutory delusions. They believed that certain persons were entering their house, spreading dust and fluff and "wearing down their shoes". Both had, in addition, other symptoms supporting a diagnosis of [[paranoid]] [[psychosis]], which could be made independently in either case.
+:Margaret and her husband Michael, both aged 34 years, were discovered to be suffering from ''folie à deux'' when they were both found to be sharing similar persecutory delusions. They believed that certain persons were entering their house, spreading dust and fluff and "wearing down their shoes". Both had, in addition, other symptoms supporting a diagnosis of [[Paranoia|paranoid]] [[psychosis]], which could be made independently in either case.
-This syndrome is most commonly diagnosed when the two or more individuals concerned live in close proximity and may be socially or physically isolated and have little interaction with other people.
+This syndrome is most commonly diagnosed when the two or more individuals concerned live in proximity and may be socially or physically isolated and have little interaction with other people.
-Various sub-classification of ''folie à deux'' have been proposed to describe how the delusional belief comes to be held by more than one person.
+Various sub-classifications of ''folie à deux'' have been proposed to describe how the delusional belief comes to be held by more than one person.
 * '''Folie imposée''' is where a dominant person (known as the 'primary', 'inducer' or 'principal') initially forms a delusional belief during a psychotic episode and imposes it on another person or persons (known as the 'secondary', 'acceptor' or 'associate') with the assumption that the secondary person might not have become deluded if left to their own devices. If the parties are admitted to hospital separately then the delusions in the person with the induced beliefs usually resolve without the need of medication.
 * '''Folie simultanée''' describes the situation where two people, considered to independently suffer from psychosis, influence the content of each other's delusions so they become identical or strikingly similar.
-Folie à deux and its more populous cousins are in many ways a psychiatric curiosity. The current [[Diagnostic and Statistical Manual of Mental Disorders]] states that a person cannot be diagnosed as being delusional if the belief in question is one "ordinarily accepted by other members of the person's culture or subculture" (see entry for [[delusion]]). It is not clear at what point a belief considered to be delusional escapes from the ''folie à...'' diagnostic category and becomes exempt because of the number of people holding it. While a large number of people may come to believe obviously false and potentially distressing things based purely on hearsay, these beliefs are not considered to be clinical delusions by the psychiatric profession and may be labelled as [[mass hysteria]].
+Folie à deux and its more populous cousins are in many ways a psychiatric curiosity. The current [[Diagnostic and Statistical Manual of Mental Disorders]] states that a person cannot be diagnosed as being delusional if the belief in question is one "ordinarily accepted by other members of the person's culture or subculture" (see entry for [[delusion]]). It is not clear at what point a belief considered to be delusional escapes from the ''folie à...'' diagnostic category and becomes legitimate because of the number of people holding it. When a large number of people may come to believe obviously false and potentially distressing things based purely on hearsay, these beliefs are not considered to be clinical delusions by the psychiatric profession and are labelled instead as [[mass hysteria]].
-Being defined as a rare pathological manifestation, ''folie à deux'' is rarely found in general psychology or social psychology text books, and is relatively unknown outside  [[abnormal psychology]], [[psychiatry]] and [[psychopathology]].
+Being defined as a rare pathological manifestation, folie à deux is rarely found in general psychology or [[social psychology]] text books, and is relatively unknown outside [[abnormal psychology]], [[psychiatry]] and [[psychopathology]].
+===Related phenomena===
+There have been reports that a similar phenomenon to folie à deux had been induced by the military [[incapacitating agent]] [[3-Quinuclidinyl benzilate|BZ]] in the late 60s, and most recently again by anthropologists in the South American rainforest consuming the [[hallucinogen]] [[ayahuasca]] (Metzner, 1999).
+==In the media==
+* (1994) [[Heavenly Creatures|Heavenly Creatures]] is a film directed by [[Peter Jackson|Peter Jackson]] and starring [[Kate Winslet|Kate Winslet]] and [[Melanie Lynskey|Melanie Lynskey]].  It was set in [[New Zealand|New Zealand]] and inspired by a true story where two teenage girls develop a relationship so strong and peculiar that they believe the only way to stay together was to kill one of the girls' mother.  These girls were thought to have folie à deux.
+* (1998) ''Folie à deux'' was the title of an episode from season 5 of [[The X-Files]], aired in 1998, where [[Fox Mulder|Agent Mulder]] shares the belief with a telemarketer that employees of the telemarketing firm are monsters.
+* (2006) [[Folie_à_Deux_(Film)|'Folie à Deux']] is the title of a short film written and directed by [[Devin Anderson]]. The film was shot in 2006 and is currently in post-production.
+* (2006) ''Folie à deux'' was referenced and defined in an episode from season 2 of [[Criminal Minds]] entitled "The Perfect Storm", which aired October 4, 2006 on CBS, in which a pair of serial killers kidnapped, tortured, and murdered several young women; in this episode, the primary, or dominant, perpetrator was a woman.
+* (2007) The film ''[[Bug (2007 film)|Bug]]'' portrays a ''folie à deux'' involving a man and woman who believe they are infested with government-implanted, nano-technological insects.
 ==See also==
@@ Line 21: / Line 50: @@
 * [[Delusional disorder]]
 * [[Psychosis]]
-* [[Stockholm Syndrome]]
-* [[Our Lady of Fatima]]: The fate of the three children
-* The [[The X-Files (season 5)#Folie .C3.A0 Deux|X-Files]], for an episode about the subject
 ==Further reading==
-*Halgin, R. & Whitbourne, S. (2002) ''Abnormal Psychology: Clinical Perspectives on Psychological Disorders''. McGraw-Hill. ISBN 0072817216
+* Halgin, R. & Whitbourne, S. (2002) ''Abnormal Psychology: Clinical Perspectives on Psychological Disorders''. McGraw-Hill. ISBN 0072817216
-*Enoch, D. & Ball, H. (2001) Folie à deux (et Folie à plusieurs). In Enoch, D. & Ball, H. ''Uncommon psychiatric syndromes (Fourth edition)''. London: Arnold. ISBN 0340763884<br>
+* Enoch, D. & Ball, H. (2001) Folie à deux (et Folie à plusieurs). In Enoch, D. & Ball, H. ''Uncommon psychiatric syndromes (Fourth edition)''. London: Arnold. ISBN 0340763884
-*[http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12679591&dopt=Abstract Wehmeier, P. M., Barth, N., & Remschmidt, H. (2003)]. Induced Delusional Disorder. A Review of the Concept and an Unusual Case of folie a famille. ''Psychopathology'', 36(1), 37-45.<br>
+* {{cite journal |author=Wehmeier PM, Barth N, Remschmidt H |title=Induced delusional disorder. a review of the concept and an unusual case of folie à famille |journal=Psychopathology |volume=36 |issue=1 |pages=37-45 |year=2003 |pmid=12679591 |doi=10.1159/000069657}}
+* {{cite book |author=Hatfield, Elaine, Caccioppo, John T., & Rapson, Richard L. |title=Emotional contagion (Studies in Emotional and Social Interaction) |publisher=Cambridge University Press |location=Cambridge, UK |year=1994 |pages= |isbn=0-521-44948-0 |oclc= |doi=}}
-*Podmore, Frank, London (ca 1920) ''Telepathic Hallucinations: A  New View of Ghosts''
+* {{cite book |author=Metzner, Ralph, editor |title=Ayahuasca: Human Consciousness and the Spirits of Nature |publisher=Thunder's Mouth Press |location=New York, NY |year= |pages= |isbn=1-56025-160-3 |oclc= |doi=}}
-*Hatfield, Elaine, Caccioppo, John T., & Rapson, Richard L., (1994) ''Emotional Contagion (Studies in Emotional and Social Interaction)''
+==External links==
+* [http://www.imdb.com/title/tt0751127/ ''Folie à deux'' episode synopsis] from IMDb, the Internet Movie Database.
+* [http://www.myspace.com/foliedeux ''Folie à deux'' musical project] from the purple forest.
+{{Mental and behavioural disorders}}
 [[Category:Psychosis]]
+<!--
+[[de:Folie à deux]]
+[[fr:Folie à deux]]
 [[nl:Gedeelde psychotische stoornis]]
 [[pl:Indukowane zaburzenie urojeniowe]]
+[[sr:Фоли а ду]]
+[[sv:Folie à deux]]
+--->
 {{enWP|Folie à deux}}

v·d·e WHO ICD-10 mental and behavioural disorders (F · 290–319)
Neurological/ symptomatic	Dementia (Alzheimer's disease, multi-infarct dementia, Pick's disease, Creutzfeldt-Jakob disease, Huntington's disease, Parkinson's disease, AIDS dementia complex, Frontotemporal dementia) · Delirium · Post-concussion syndrome
Psychoactive substance	alcohol (drunkenness, alcohol dependence, delirium tremens, Korsakoff's syndrome, alcohol abuse) · opiods (opioid dependency) · sedative/hypnotic (benzodiazepine withdrawal) · cocaine (cocaine dependence) · general (Intoxication, Drug abuse, Physical dependence, Withdrawal)
Psychotic disorder	Schizophrenia (disorganized schizophrenia) · Schizotypal personality disorder · Delusional disorder · Folie à deux · Schizoaffective disorder
Mood (affective)	Mania · Bipolar disorder · Clinical depression · Cyclothymia · Dysthymia
Neurotic, stress-related and somatoform	Anxiety disorder (Agoraphobia, Panic disorder, Panic attack, Generalized anxiety disorder, Social anxiety) · OCD · Acute stress reaction · PTSD · Adjustment disorder · Conversion disorder (Ganser syndrome) · Somatoform disorder (Somatization disorder, \Body dysmorphic disorder, Hypochondriasis, Nosophobia, Da Costa's syndrome, Psychalgia) · Neurasthenia
Physiological/ physical behavioural	Eating disorder (anorexia nervosa, bulimia nervosa) · Sleep disorder (dyssomnia, insomnia, hypersomnia, parasomnia, night terror, nightmare) · Sexual dysfunction (erectile dysfunction, premature ejaculation, vaginismus, dyspareunia, hypersexuality) · Postnatal depression
Adult personality and behaviour	Personality disorder · Passive-aggressive behavior · Kleptomania · Trichotillomania · Voyeurism · Factitious disorder · Munchausen syndrome · Ego-dystonic sexual orientation
Intellectual disability	Intellectual disability
Psychological development (developmental disorder)	Specific: speech and language (expressive language disorder, aphasia, expressive aphasia, receptive aphasia, Landau-Kleffner syndrome, lisp) · Scholastic skills (dyslexia, dysgraphia, Gerstmann syndrome) · Motor function (developmental dyspraxia) · Pervasive: Autism/Asperger syndrome · Rett syndrome
Behavioural and emotional, childhood and adolescence onset	ADHD · Conduct disorder · Oppositional defiant disorder · Separation anxiety disorder · Selective mutism · Reactive attachment disorder · Tic disorder · Tourette syndrome · Speech (stuttering · cluttering)


ICD-10	F 24
ICD-9	297.3
OMIM	[1]
DiseasesDB	34350
MedlinePlus	[2]
eMedicine	med/3352
MeSH	{{{MeshNumber}}}