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The relative psychometric function: A general analysis framework for relating psychological processes.

Brian Maniscalco1, Olenka Graham Castaneda1, Brian Odegaard2

  • 1Department of Cognitive Sciences, University of California, Irvine.

Psychological Review
|June 15, 2026
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Summary
This summary is machine-generated.

A new method, relative psychometric function (RPF) analysis, quantifies relationships between psychological processes. This approach reveals how factors like dot density alter the link between task performance and subjective confidence.

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Area of Science:

  • Cognitive Psychology
  • Psychophysics
  • Neuroscience

Background:

  • Psychophysics traditionally links objective stimuli to subjective perception.
  • Existing methods struggle to quantify relationships *among* psychological processes.
  • Understanding performance-subjective experience links is crucial for cognitive science.

Purpose of the Study:

  • To introduce a novel psychophysical method, relative psychometric function (RPF) analysis.
  • To quantitatively characterize nonlinear relationships between psychological processes.
  • To investigate how these relationships vary with experimental conditions.

Main Methods:

  • Developed relative psychometric function (RPF) analysis.
  • Applied RPF analysis to human psychophysical data (random dot kinematograms).
  • Manipulated motion coherence, dot density, and collected confidence ratings.

Main Results:

  • RPF analysis revealed systematic changes in performance-subjective measure relationships.
  • Dot density and task design significantly altered links between performance and confidence/metacognitive sensitivity.
  • Demonstrated the flexibility of RPF analysis across various psychological measures.

Conclusions:

  • RPF analysis offers a powerful tool for understanding dynamic psychological process interactions.
  • This method can uncover how experimental manipulations influence the interplay between performance and subjective experience.
  • An open-source RPF toolbox is provided to facilitate community adoption.