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Is probabilistic evidence a source of knowledge?

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People are less likely to grant knowledge for true beliefs when evidence is probabilistic rather than perceptual. This is due to distrust in generalizing from population data to individuals, not justification or error concerns.

Keywords:
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Area of Science:

  • Cognitive Psychology
  • Epistemology
  • Social Psychology

Background:

  • Traditional philosophical accounts suggest knowledge requires justification and certainty.
  • Previous research indicates people may hesitate to ascribe knowledge based on probabilistic evidence.

Purpose of the Study:

  • To investigate whether people attribute knowledge for true beliefs derived from probabilistic evidence.
  • To identify the underlying reasons for potential knowledge denial in such cases.
  • To explore the role of population-level reasoning versus case-specific evidence.

Main Methods:

  • Participants evaluated knowledge attribution for true beliefs under different evidence conditions: probabilistic, perceptual, and testimonial.
  • Experiments systematically varied the nature of probabilistic evidence (general vs. case-specific).
  • Statistical analyses examined differences in knowledge ascription across conditions.

Main Results:

  • Knowledge attribution was significantly lower for beliefs based on probabilistic evidence compared to perceptual or causal testimonial evidence.
  • Denial of knowledge was not explained by perceived lack of justification or possibility of error.
  • Willingness to ascribe knowledge increased when probabilistic evidence was specific to the individual case.

Conclusions:

  • People are reluctant to grant knowledge based on probabilistic evidence due to a distrust of generalizing from population statistics to individuals.
  • This challenges traditional philosophical explanations for knowledge acquisition.
  • Case-specific probabilistic evidence is more readily accepted for knowledge attribution, aligning with judgment and decision-making research.