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Prevalence-induced concept change in human judgment.

David E Levari1, Daniel T Gilbert2, Timothy D Wilson3

  • 1Harvard University, Cambridge, MA, USA.

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Summary
This summary is machine-generated.

Reductions in social problems can paradoxically increase their perceived prevalence. This "prevalence-induced concept change" makes issues seem more intractable, even when people try to resist it.

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Area of Science:

  • Cognitive psychology
  • Social psychology
  • Perception science

Background:

  • Social problems often appear intractable, resisting solutions.
  • Understanding the psychological mechanisms behind this intractability is crucial.

Purpose of the Study:

  • To investigate how changes in stimulus prevalence affect concept perception.
  • To explore the phenomenon of prevalence-induced concept change (PIC-C).

Main Methods:

  • Participants were exposed to varying frequencies of stimuli (e.g., colors, faces, requests).
  • Categorization tasks were used to assess concept boundaries.
  • Forewarning and incentives were employed to test the robustness of the effect.

Main Results:

  • Decreasing stimulus prevalence led to concept expansion.
  • Participants re-categorized stimuli into the target category when it became rare (e.g., seeing purple as blue).
  • This effect persisted despite warnings and financial incentives.

Conclusions:

  • Prevalence-induced concept change is a robust cognitive bias.
  • Reductions in the prevalence of social problems may inadvertently increase their perceived scope.
  • This psychological mechanism could contribute to the intractability of social issues.