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What is Capgras delusion?

Max Coltheart1, Martin Davies2,3

  • 1School of Psychological Sciences, Macquarie University, Sydney, Australia.

Cognitive Neuropsychiatry
|December 10, 2021
PubMed
Summary
This summary is machine-generated.

Capgras delusion involves believing familiar people or things are replaced by strangers. This occurs due to a weakened sympathetic nervous system response to familiarity, combined with impaired hypothesis evaluation.

Keywords:
Capgras delusionbelief formationfamiliarityskin conductance response (SCR)two-factor theory of delusion

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Delusional Disorders

Background:

  • Capgras delusion is characterized by the belief that familiar individuals have been replaced by impostors.
  • This phenomenon extends beyond familiar people to include familiar objects, pets, and even voices.

Purpose of the Study:

  • To evaluate the proposal that diverse replacement beliefs are subtypes of Capgras delusion.
  • To investigate the underlying psychophysiological mechanisms of these replacement beliefs.

Main Methods:

  • The study examined the sympathetic nervous system (SNS) response to familiar versus unfamiliar stimuli.
  • The research proposed a unified etiological model for various Capgras-like delusions.

Main Results:

  • Familiar stimuli typically elicit a stronger SNS response than unfamiliar stimuli.
  • In Capgras delusion, this differential SNS response is absent, leading to the belief of replacement.

Conclusions:

  • All five scenarios of replacement beliefs should be classified as subtypes of Capgras delusion.
  • Weakened SNS responses to familiar stimuli contribute to these replacement beliefs.
  • Delusion formation requires both the SNS response pattern and impaired hypothesis evaluation.