The Index of Pupillary Activity: Measuring Cognitive Load vis-à-vis Task Difficulty with Pupil Oscillation

Andrew T. Duchowski , Krzysztof Krejtz , Izabela Krejtz , Cezary Biele , Anna Niedzielska , Peter Kiefer , Martin Raubal , Ioannis Giannopoulos


A novel eye-tracked measure of the frequency of pupil diameter oscillation is proposed for capturing what is thought to be an indicator of cognitive load. The proposed metric, termed the Index of Pupillary Activity, is shown to discriminate task difficulty vis-a-vis cognitive load (if the implied causality can be assumed) in an experiment where participants performed easy and difficult mental arithmetic tasks while fixating a central target (a requirement for replication of prior work). The paper's contribution is twofold: full documentation is provided for the calculation of the proposed measurement which can be considered as an alternative to the existing proprietary Index of Cognitive Activity (ICA). Thus, it is possible for researchers to replicate the experiment and build their own software which implements this measurement. Second, several aspects of the ICA are approached in a more data-sensitive way with the goal of improving the measurement's performance
Author Andrew T. Duchowski
Andrew T. Duchowski,,
, Krzysztof Krejtz (Wydział Psychologii)
Krzysztof Krejtz,,
- Wydział Psychologii
, Izabela Krejtz (Wydział Psychologii)
Izabela Krejtz,,
- Wydział Psychologii
, Cezary Biele
Cezary Biele,,
, Anna Niedzielska
Anna Niedzielska,,
, Peter Kiefer
Peter Kiefer,,
, Martin Raubal
Martin Raubal,,
, Ioannis Giannopoulos
Ioannis Giannopoulos,,
Publication size in sheets0.6
Book Mandryk Regan, Hancock Mark, Perry Mark, Cox Anna (eds.): Proceedings of the 2018 CHI Conference on Human Factors in Computing Systems, 2018, Association for Computing Machinery, ISBN 978-1-4503-5620-6, 8403 p., DOI:10.1145/3173574.3173856
Keywords in Englishpupillometry; eye tracking; task difficulty
Languageen angielski
The Index of Pupillary Activity.pdf 4.11 MB
Additional file
Oswiadczenie_K.Krejtz_The Index of Pupillary.pdf 88.28 KB
Oswiadczenie_I.Krejtz_conference papers_The Index of Pupillary.pdf 234.88 KB
Score (nominal)20
Score sourcepublisherList
Citation count*54 (2020-09-19)
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