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REMoDNaV: Robust Eye-Movement Classification for Dynamic Stimulation

View ORCID ProfileAsim H. Dar, View ORCID ProfileAdina S. Wagner, View ORCID ProfileMichael Hanke
doi: https://doi.org/10.1101/619254
Asim H. Dar
1Special Lab Non-Invasive Brain Imaging, Leibniz Institute for Neurobiology, Magdeburg, Germany
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Adina S. Wagner
2Psychoinformatics lab, Institute of Neuroscience and Medicine (INM-7), Research Centre Jülich, Germany
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  • For correspondence: adina.wagner@t-online.de
Michael Hanke
2Psychoinformatics lab, Institute of Neuroscience and Medicine (INM-7), Research Centre Jülich, Germany
3Institute of Systems Neuroscience, Medical Faculty, Heinrich Heine University Düsseldorf, Germany
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Abstract

Tracking of eye movements is an established measurement for many types of experimental paradigms. More complex and more prolonged visual stimuli have made algorithmic approaches to eye movement event classification the most pragmatic option. A recent analysis revealed that many current algorithms are lackluster when it comes to data from viewing dynamic stimuli such as video sequences. Here we present an event classification algorithm—built on an existing velocity-based approach—that is suitable for both static and dynamic stimulation, and is capable of classifying saccades, post-saccadic oscillations, fixations, and smooth pursuit events. We validated classification performance and robustness on three public datasets: 1) manually annotated, trial-based gaze trajectories for viewing static images, moving dots, and short video sequences, 2) lab-quality gaze recordings for a feature length movie, and 3) gaze recordings acquired under suboptimal lighting conditions inside the bore of a magnetic resonance imaging (MRI) scanner for the same full-length movie. We found that the proposed algorithm performs on par or better compared to state-of-the-art alternatives for static stimulation. Moreover, it yields eye movement events with biologically plausible characteristics on prolonged dynamic recordings. Lastly, algorithm performance is robust on data acquired under suboptimal conditions that exhibit a temporally varying noise level. These results indicate that the proposed algorithm is a robust tool with improved classification accuracy across a range of use cases. The algorithm is cross-platform compatible, implemented using the Python programming language, and readily available as free and open source software from public sources.

Footnotes

  • - replaced Figure 1 with a flowchart-like overview of the algorithm, and removed Figures 2 and 3 in favor of the new figure, - added Figure 6 with a comparison of unfiltered velocities between samples - changed the title of our manuscript to "REMoDNaV: Robust Eye-Movement Classification for Dynamic Stimulation" - added an interpretation for the Jaccard index - replaced subplots in Figure 5 (formerly Figure 7) with plots of unfiltered data, and - adjusted phrases and citations as requested by the reviewers

  • https://github.com/psychoinformatics-de/remodnav

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted March 19, 2020.
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REMoDNaV: Robust Eye-Movement Classification for Dynamic Stimulation
Asim H. Dar, Adina S. Wagner, Michael Hanke
bioRxiv 619254; doi: https://doi.org/10.1101/619254
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REMoDNaV: Robust Eye-Movement Classification for Dynamic Stimulation
Asim H. Dar, Adina S. Wagner, Michael Hanke
bioRxiv 619254; doi: https://doi.org/10.1101/619254

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