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Overconfidence or resolution in psychosis: a Bayesian reanalysis.

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People with schizophrenia exhibit poorer resolution, meaning they struggle to gauge confidence in their judgments. This overconfidence in errors may contribute to delusions, highlighting a key deficit in psychosis.

Keywords:
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Area of Science:

  • Cognitive psychology
  • Psychiatry
  • Neuroscience

Background:

  • Individuals with psychosis often display overconfidence in incorrect judgments, a bias linked to delusion formation.
  • The ability to accurately assess one's confidence (resolution) in psychosis has not been extensively studied.

Purpose of the Study:

  • To investigate whether individuals with psychosis exhibit a deficit in judgment resolution.
  • To compare resolution and overconfidence levels in schizophrenia patients, high delusion-prone, and low delusion-prone individuals.

Main Methods:

  • Employed hierarchical Bayesian modeling and Type 2 Signal Detection Theory.
  • Assessed 25 participants with schizophrenia, 25 high delusion-prone, and 25 low delusion-prone individuals.
  • Utilized a discrimination index and over/underconfidence statistic to measure resolution and overconfidence.

Main Results:

  • All groups demonstrated low discrimination indices, indicating poor resolution.
  • Schizophrenia participants showed significantly poorer resolution compared to low delusion-prone individuals.
  • All groups were overconfident, with the highest level observed in the schizophrenia group.

Conclusions:

  • Schizophrenia patients display impaired ability to use confidence judgments for discriminating correct from incorrect decisions.
  • Resolution deficits in psychosis may have significant theoretical and clinical implications for understanding and treating delusions.