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Folie à Deux

Folie à Deux

Folie à Deux refers to a condition where one person's delusion is transferred to another person in a close relationship, causing both individuals to share the same delusional belief. It is also known as 'shared delusional disorder.'

Details

Overview

Hi, I'm Mindy. Today, let's talk about Folie à Deux — also known as shared psychosis.

Folie à Deux is a French term meaning 'madness of two.' It describes a rare phenomenon in which the delusional beliefs of one person (the inducer) are transmitted to another person (the recipient) in a close relationship, causing both individuals to share the same delusion. In the DSM-5, it is classified as Shared Psychotic Disorder.

Key Concepts

Several conditions are typically necessary for this phenomenon to occur. First, the two individuals must share a close relationship (such as spouses, parent-child, or siblings). Second, they are often socially isolated from the outside world. Third, the inducer generally holds a dominant position over the recipient.

The inducer typically has an underlying psychotic disorder such as schizophrenia or delusional disorder. The recipient may initially doubt the inducer's claims, but through repeated exposure in an isolated environment, they gradually come to accept the same delusions.

Interestingly, when the recipient is separated from the inducer, the recipient's delusions often disappear relatively quickly. This demonstrates that the recipient's delusions stem from relational influence rather than an independent psychotic disorder.

This May Apply When...

  • A couple, cut off from the outside world, shares the same persecutory delusion
  • A child fully accepts a parent's delusional beliefs as truth
  • Unrealistic beliefs spread among members of an isolated group
  • People around a dominant individual come to agree with that person's unfounded beliefs

    • How Can You Cope?

  • Professional intervention is essential — Folie à Deux always requires the help of a mental health professional.
  • Separation is key — Temporarily separating the recipient from the inducer is often the first step in treatment.
  • Treating the inducer — Addressing the inducer's underlying psychotic disorder is the fundamental solution.
  • Restoring social connections — Increasing contact with the outside world helps rebuild the ability to reality-test.
  • Family counseling — Understanding relationship dynamics and building healthier relationship patterns is crucial.

    • A Word from Mindy

    The influence of someone close to us is far more powerful than we might realize. It's natural to want to understand the world through the eyes of someone we love — but joining them in beliefs that are disconnected from reality can be dangerous. Try to maintain your connections with the outside world, and don't hesitate to reach out for help when you need it.

    💡 Real-Life Example

    A mother and daughter who lived with almost no contact with the outside world: the mother developed the delusion that 'the neighbors are watching us,' and gradually the daughter also came to accept this belief as fact.

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    This content is for educational purposes and does not replace professional medical diagnosis.

    Folie à Deux (Folie à Deux) | 마음스캔 심리학 용어사전