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Social influence and perceptual decision making: a diffusion model analysis.

Markus Germar1, Alexander Schlemmer, Kristine Krug

  • 11University of Hildesheim, Germany.

Personality & Social Psychology Bulletin
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Summary
This summary is machine-generated.

Social influence impacts perception by altering sensory evidence uptake, not decision criteria. This study used diffusion models to differentiate these cognitive processes in decision-making tasks.

Keywords:
conformitydiffusion modelmotivated reasoningperceptual decision-makingsocial influence

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Area of Science:

  • Cognitive psychology
  • Social psychology
  • Decision-making science

Background:

  • Classic studies explored social influence on judgment using perceptual tasks.
  • A fundamental question is whether social influence affects basic perceptual processes.

Purpose of the Study:

  • To determine if social influence alters sensory evidence uptake or decision criteria.
  • To differentiate cognitive mechanisms underlying social influence in perception.

Main Methods:

  • Employed diffusion model analysis for speeded binary decisions.
  • Utilized a stochastic approach to separate cognitive processes.
  • Conducted two experiments to test hypotheses.

Main Results:

  • Found consistent evidence that social influence modifies the uptake of sensory evidence.
  • Demonstrated that participants did not shift their decision criteria due to social influence.

Conclusions:

  • Social influence primarily affects how sensory information is processed, not the threshold for making a decision.
  • Diffusion models effectively distinguish between evidence accumulation and criterion setting in social influence research.