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Related Experiment Video

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Joint Cognitive Models Reveal Sources of Robust Individual Differences in Conflict Processing.

M Fiona Molloy1, Taraz G Lee2, John Jonides2

  • 1Department of Psychiatry, University of Michigan, Ann Arbor, MI, USA.

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|March 23, 2026
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Summary
This summary is machine-generated.

Individual differences in cognitive tasks are mainly driven by general decision-making, not conflict-specific processes. This study used hierarchical Bayesian joint modeling to analyze conflict task data, revealing reliable individual differences in task-general mechanisms.

Keywords:
conflict taskhierarchical Bayesianindividual differencesjoint modelinglinear ballistic accumulator model

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Area of Science:

  • Cognitive Psychology
  • Computational Neuroscience
  • Psychometrics

Background:

  • Conflict tasks (e.g., Stroop, Flanker, Simon) show poorer performance in incongruent conditions.
  • Debate exists on whether individual differences in conflict tasks reflect reliable, trait-like mechanisms.
  • Previous methods like difference scores have poor psychometric properties, and separate modeling fails to account for measurement error.

Purpose of the Study:

  • To simultaneously model distinct mechanisms of conflict task performance and their covariance.
  • To improve individual estimation and account for measurement error using hierarchical Bayesian joint modeling.
  • To investigate the reliability and generalizability of conflict-specific versus task-general mechanisms.

Main Methods:

  • Applied the conflict linear ballistic accumulator model (LBA) to large datasets with multiple conflict tasks and test-retest sessions.
  • Utilized hierarchical Bayesian joint modeling to estimate cognitive process parameters and their covariation simultaneously.
  • Included a dataset with a conflict task and a simple perceptual decision-making task to assess task-general mechanisms.

Main Results:

  • Found moderate test-retest reliability for both conflict-specific and task-general mechanisms within conflict tasks.
  • Task-general mechanisms, but not conflict-specific ones, showed correlations across different conflict tasks.
  • Task-general mechanisms were also correlated between conflict tasks and a simple decision-making task.

Conclusions:

  • Robust individual differences exist in computational mechanisms underlying general decision-making.
  • Evidence does not support reliable individual differences in mechanisms specifically for conflict processing.
  • Findings suggest that general cognitive abilities, rather than conflict-specific ones, drive individual differences in performance on conflict tasks.