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The intentionality bias in schizophrenia.

Elodie Peyroux1, Brent Strickland2, Isabelle Tapiero3

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People with schizophrenia over-attribute intentionality to actions, unlike healthy individuals. This bias stems from an inability to inhibit the automatic tendency to perceive actions as intentional.

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Area of Science:

  • Cognitive Psychology
  • Psychiatry
  • Neuroscience

Background:

  • Schizophrenia often involves persecutory delusions, linked to over-interpreting daily events as intentional.
  • The intentionality bias, an automatic inclination to interpret actions as intentional, is present in healthy individuals.

Purpose of the Study:

  • To investigate if schizophrenia is associated with an abnormal intentionality bias.
  • To explore the cognitive mechanisms underlying intentionality attribution in schizophrenia.

Main Methods:

  • Schizophrenia patients and healthy controls viewed sentences describing actions.
  • Participants indicated whether actions were intentional, irrespective of linguistic context.

Main Results:

  • Schizophrenia patients showed a significant bias towards over-attributing intentionality.
  • This bias was consistent across different linguistic contexts, unlike in controls.
  • An inability to inhibit automatic intentionality attribution was observed.

Conclusions:

  • The findings suggest an abnormal intentionality bias in schizophrenia.
  • This bias may contribute to persecutory delusions by over-attributing intent to actions.
  • Impaired inhibition of automatic cognitive processes underlies this bias.