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A Psychophysics Paradigm for the Collection and Analysis of Similarity Judgments
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A Similarity-Based Process for Human Judgment in the Parietal Cortex.

Linnea Karlsson Wirebring1,2,3, Sara Stillesjö2,3, Johan Eriksson2,3

  • 1Department of Psychology, Umeå University, Umeå, Sweden.

Frontiers in Human Neuroscience
|January 12, 2019
PubMed
Summary
This summary is machine-generated.

Cognitive psychology research reveals that associative and rule-based judgments are not mutually exclusive but work together. The precuneus brain region plays a key role in similarity-based judgments, even during rule-based tasks.

Keywords:
cognitive modelexemplar modelfMRIjudgment and decision-makingmultiple-cue judgment

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Decision Making

Background:

  • Traditionally, associative (similarity-based) and analytical (rule-based) cognitive processes were viewed as competing, with only one engaged at a time.
  • Emerging evidence suggests these processes may function in parallel and interact during judgment tasks.
  • Understanding the neural underpinnings of these judgment strategies is crucial for cognitive theories.

Purpose of the Study:

  • To investigate the neural correlates of associative and rule-based judgment processes.
  • To determine if these processes are engaged simultaneously or exclusively.
  • To identify brain regions involved in similarity-based and rule-based decision-making.

Main Methods:

  • Employed computational modeling and functional brain imaging (fMRI) on 74 participants.
  • Analyzed brain activity during both spontaneous and instructed judgment tasks (similarity-based vs. rule-based).
  • Correlated brain activity with the predictive fit of associative and rule-based computational models.

Main Results:

  • Identified significant overlap in brain activity patterns for both associative and rule-based judgments.
  • The precuneus showed increased activation for both judgment types, with activity predicting the success of similarity-based models.
  • Activity in the superior frontal gyrus predicted the fit of rule-based judgment models.

Conclusions:

  • The precuneus is a critical neural hub for similarity-based judgments, active even when rule-based processes dominate.
  • Findings support a parallel processing model where associative and rule-based judgments occur simultaneously.
  • This challenges the 'either-or' view and has significant implications for cognitive theories of human judgment.