The effect of social content on deductive reasoning: An fMRI study

Nicola Canessa, Alessandra Gorini, Stefano F. Cappa, Massimo Piattelli-Palmarini, Massimo Danna, Ferruccio Fazio, Daniela Perani

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


Psychological studies of deductive reasoning have shown that subjects' performance is affected significantly by the content of the presented stimuli. Specifically, subjects find it easier to reason about contexts and situations with a social content. In the present study, the effect of content on brain activation was investigated with functional magnetic resonance imaging (fMRI) while subjects were solving two versions of the Wason selection task, which previous behavioral studies have shown to elicit a significant content effect. One version described an arbitrary relation between two actions (Descriptive: "If someone does ..., then he does ..."), whereas the other described an exchange of goods between two persons (Social-Exchange: "If you give me ..., then I give you ..."). Random-effect statistical analyses showed that compared to baseline, both tasks activated frontal medial cortex and left dorsolateral frontal and parietal regions, confirming the major role of the left hemisphere in deductive reasoning. In addition, although the two reasoning conditions were identical in logical form, the social-exchange task was also associated with right frontal and parietal activations, mirroring the left-sided activations common to both reasoning tasks. These results suggest that the recruitment of the right hemisphere is dependent on the content of the stimuli presented.

Original languageEnglish (US)
Pages (from-to)30-43
Number of pages14
JournalHuman Brain Mapping
Issue number1
StatePublished - Sep 2005


  • Conditional rules
  • Content effect
  • Deductive reasoning
  • Social exchange
  • Wason selection task
  • fMRI

ASJC Scopus subject areas

  • Anatomy
  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging
  • Neurology
  • Clinical Neurology


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