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The origin of conditional logic: does a cheater detection module exist?

Anton E Lawson1

  • 1Department of Biology, Arizona State University, Tempe, AZ 85287-1501, USA. anton.lawson@asu.edu

The Journal of Genetic Psychology
|December 24, 2002
PubMed
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This study tested whether conditional logic evolved for detecting cheaters or if adult reasoning is generally logical. Findings suggest adult reasoning is logical, with errors stemming from misunderstandings, not a lack of logicality.

Area of Science:

  • Cognitive Psychology
  • Evolutionary Psychology
  • Behavioral Science

Background:

  • The origin of conditional logic in human reasoning has been debated.
  • One hypothesis suggests it evolved for social exchange and cheater detection (domain-specific).
  • An alternative posits general logical competence with errors due to misunderstandings.

Purpose of the Study:

  • To empirically test the domain-specific cheater detection hypothesis against a domain-general misunderstandings hypothesis.
  • To investigate the underlying mechanisms of conditional reasoning in adults.

Main Methods:

  • Five experiments were conducted with 682 undergraduate students (Experiments 1-4) and 188 students (Experiment 5).
  • Participants completed a series of selection tasks designed to assess conditional reasoning.

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  • Performance data were analyzed to differentiate between the two competing hypotheses.

    • Main Results:

    • Results were inconsistent with the cheater detection hypothesis.
    • Findings supported the misunderstandings hypothesis regarding conditional reasoning.
    • Evidence suggests adults possess general-purpose logical competence rather than domain-specific modules.

    Conclusions:

    • Adult conditional reasoning appears to be based on general logical competence.
    • Errors in reasoning are more likely attributable to misunderstandings than to a lack of inherent logicality.
    • The findings challenge domain-specific evolutionary accounts of conditional logic.