CHAP: Open-source software for processing and analyzing pupillometry data

Ronen Hershman, Avishai Henik, Noga Cohen

Research output: Contribution to journalArticlepeer-review


Pupil dilation is an effective indicator of cognitive and affective processes. Although several eyetracker systems on the market can provide effective solutions for pupil dilation measurement, there is a lack of tools for processing and analyzing the data provided by these systems. For this reason, we developed CHAP: open-source software written in MATLAB. This software provides a user-friendly graphical user interface for processing and analyzing pupillometry data. Our software creates uniform conventions for the preprocessing and analysis of pupillometry data and provides a quick and easy-to-use tool for researchers interested in pupillometry. To download CHAP or join our mailing list, please visit CHAP’s website:

Original languageAmerican English
Pages (from-to)1059-1074
Number of pages16
JournalBehavior Research Methods
Issue number3
StatePublished - 15 Jun 2019


  • Bayesian analysis
  • GUI
  • Open-source code
  • Pupillometry

All Science Journal Classification (ASJC) codes

  • Experimental and Cognitive Psychology
  • Developmental and Educational Psychology
  • Arts and Humanities (miscellaneous)
  • Psychology (miscellaneous)
  • General Psychology


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