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Pupillary Response as Assessment of Effective Seizure Induction by Electroconvulsive Therapy
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Comparing methods for the analysis of pupillary response.

Janice Attard-Johnson1, Caoilte Ó Ciardha2, Markus Bindemann2

  • 1Department of Psychology, Faculty of Science and Technology, Bournemouth University, Fernbarrow, Poole, BH12 5BB, UK. jattardjohnson@bournemouth.ac.uk.

Behavior Research Methods
|October 17, 2018
PubMed
Summary

Different methods for analyzing pupil size data in psychological research yield similar results. However, baseline correction may introduce carryover effects between trials.

Keywords:
AnalysisDilationEyePercentage changePrestimulus baseline correctionPupilz-scores

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Area of Science:

  • Psychology
  • Cognitive Neuroscience
  • Physiological Psychology

Background:

  • Pupil size changes reflect various cognitive processes.
  • Inconsistent pupillary response data analysis protocols exist in psychological literature.
  • The impact of different analysis methods on pupillary response data outcomes is unclear.

Purpose of the Study:

  • To investigate whether varying pupillary response data analysis methods influence study outcomes.
  • To compare the results of four distinct analysis approaches.
  • To assess the reliability of pupillary response data analysis in psychological research.

Main Methods:

  • Comparison of four pupillary response data analysis methods: raw, z-scored, percentage-change, and prestimulus baseline correction.
  • Utilized pupillary responses to sexually appetitive visual stimuli across two experiments.
  • Evaluated the consistency of outcomes across different analytical approaches.

Main Results:

  • Four analysis methods (raw, z-scored, percentage-change, baseline correction) produced nearly identical results.
  • All methods led to similar conclusions regarding pupillary responses.
  • Prestimulus baseline correction exhibited systematic carryover effects between trials.

Conclusions:

  • Standard methods for analyzing pupillary response data do not fundamentally alter research conclusions.
  • Prestimulus baseline correction requires careful consideration due to potential carryover effects.
  • Further research is needed to understand and mitigate carryover effects in pupillary response analysis.