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Optimal frequency bands for pupillography for maximal correlation with HRV.

Júlio Medeiros1, André Bernardes2, Ricardo Couceiro2

  • 1Centre for Informatics and Systems of the University of Coimbra, Department of Informatics Engineering, University of Coimbra, Coimbra, Portugal. juliomedeiros@dei.uc.pt.

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|January 27, 2025
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Summary

This study identifies optimal pupillography frequency bands for cognitive load assessment, correlating well with Heart Rate Variability. Findings support integrating eye-tracking for detailed analysis in real-world tasks.

Keywords:
Error mitigationHRVPupillographySoftware Engineering

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Area of Science:

  • Human-Computer Interaction
  • Cognitive Psychology
  • Biomedical Engineering

Background:

  • Assessing cognitive load via pupillography is hindered by inconsistent frequency band definitions.
  • Lack of consensus on optimal frequency ranges limits the reliability of pupillography for cognitive load measurement.

Purpose of the Study:

  • To define optimal pupillography frequency bands for accurate cognitive load assessment.
  • To establish a coherent framework for pupillography analysis in cognitive load studies.

Main Methods:

  • Controlled experiments with programmers and mental arithmetic tasks involving 72 participants.
  • Pupillography data analyzed for frequency features, correlated with Heart Rate Variability.
  • Validation of findings across different tasks and participant groups.

Main Results:

  • Identified optimal low-frequency (0.06-0.29 Hz) and high-frequency (0.29-0.49 Hz) bands for cognitive load.
  • Achieved geometric mean correlations of 0.238 and 0.236 with HRV features across studies.
  • Demonstrated superior performance compared to commonly used frequency bands in existing literature.

Conclusions:

  • The study provides a validated framework for pupillography frequency band selection in cognitive load assessment.
  • Highlights the potential of integrating eye-tracking and pupillography in authentic software development for granular cognitive load analysis.