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Reasoning and delusions

R Kemp1, S Chua, P McKenna

  • 1Department of Psychological Medicine, King's College School of Medicine and Dentistry, London.

The British Journal of Psychiatry : the Journal of Mental Science
|May 1, 1997
PubMed
Summary
This summary is machine-generated.

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Delusions in patients are linked to disordered reasoning, with deluded individuals more prone to logical errors, especially with emotive content. However, differences between deluded patients and controls were surprisingly small.

Area of Science:

  • Cognitive Psychology
  • Psychopathology
  • Neuroscience

Background:

  • Delusions are often theorized to stem from disordered reasoning, but empirical evidence remains limited.
  • This study investigated reasoning processes in individuals experiencing delusions.

Purpose of the Study:

  • To empirically assess reasoning abilities in deluded patients compared to healthy controls.
  • To examine the influence of logical fallacies and emotive content on reasoning in these groups.

Main Methods:

  • Employed standard cognitive tests assessing conditional statements, syllogisms, and probability judgments.
  • Included both neutral and emotive content within reasoning tasks.
  • Compared performance of 16 deluded patients with 16 healthy volunteers.

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Main Results:

  • Both groups made logical errors, but deluded subjects endorsed fallacious responses more often, particularly with emotive content.
  • Emotional content slightly increased the endorsement of unbelievable responses in syllogisms for the deluded group.
  • Deluded patients showed a trend towards being less susceptible to the conjunction fallacy.

Conclusions:

  • Reasoning differences between deluded patients and controls are minimal.
  • Deluded individuals exhibit a slight propensity towards endorsing invalid or fallacious reasoning, especially when emotional themes are present.