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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Psychiatry

Background:

  • Delusions in psychosis are linked to jumping to conclusions (JTC), a data-gathering bias.
  • JTC is a potential endophenotype of psychosis and may indicate treatment response.
  • Factors contributing to JTC bias require further investigation.

Purpose of the Study:

  • To investigate the relationship between JTC and working memory deficits.
  • To examine JTC in individuals with current delusions using neuropsychological tests.

Main Methods:

  • Assessed 126 individuals with schizophrenia spectrum psychosis and current delusions.
  • Administered tests for JTC and working memory.
  • Compared working memory performance between individuals with and without JTC bias.

Main Results:

  • 30-40% of the sample exhibited the JTC bias.
  • No significant differences in premorbid IQ were found between groups.
  • Individuals with JTC bias performed significantly worse on working memory tests.

Conclusions:

  • The JTC data-gathering bias is associated with impaired working memory.
  • Interventions for delusions should consider strategies to address working memory deficits.
  • Improving data-gathering strategies may benefit from targeting working memory impairments.