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Neurocognitive processes underlying heuristic and normative probability judgments.

Linus Andersson1, Johan Eriksson2, Sara Stillesjö3

  • 1Department of Psychology, Umeå University, Sweden.

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Summary
This summary is machine-generated.

The conjunction fallacy occurs when people judge combined events as more likely than single events. Avoiding this cognitive bias requires distinct analytic brain processes beyond heuristic thinking.

Keywords:
Decision makingDual-processDual-systemRepresentativenessfMRI

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Area of Science:

  • Cognitive Neuroscience
  • Decision Science
  • Behavioral Economics

Background:

  • The conjunction fallacy, where combined events are deemed more probable than individual ones, is often explained by dual-process theories.
  • These theories suggest the fallacy arises from heuristic, associative cognitive processes, and avoiding it requires analytical control.

Purpose of the Study:

  • To investigate the neurocognitive mechanisms underlying the conjunction fallacy using functional magnetic resonance imaging (fMRI).
  • To examine the brain networks associated with heuristic judgments versus analytical avoidance of the conjunction fallacy.

Main Methods:

  • Participants performed conjunction tasks while undergoing fMRI scans.
  • Brain activity was analyzed to identify regions involved in both correct and incorrect probability judgments, and specifically in avoiding the fallacy.

Main Results:

  • Both correct and incorrect judgments engaged a common brain network, similar to that used in similarity judgments.
  • Avoiding the conjunction fallacy uniquely activated a fronto-parietal network associated with supervisory, analytic control.

Conclusions:

  • Findings support the dual-process model, indicating that incorrect probability judgments stem from a representativeness heuristic.
  • Avoiding the conjunction fallacy necessitates additional neurocognitive resources for analytical processing.