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- Title
MAD saccade: statistically robust saccade threshold estimation via the median absolute deviation.
- Authors
Voloh, Benjamin; Watson, Marcus R.; König, Seth; Womelsdorf, Thilo
- Abstract
Saccade detection is a critical step in the analysis of gaze data. A common method for saccade detection is to use a simple threshold for velocity or acceleration values, which can be estimated from the data using the mean and standard deviation. However, this method has the downside of being influenced by the very signal it is trying to detect, the outlying velocities or accelerations that occur during saccades. We propose instead to use the median absolute deviation (MAD), a robust estimator of dispersion that is not influenced by outliers. We modify an algorithm proposed by Nyström and colleagues, and quantify saccade detection performance in both simulated and human data. Our modified algorithm shows a significant and marked improvement in saccade detection - showing both more true positives and less false negatives - especially under higher noise levels. We conclude that robust estimators can be widely adopted in other common, automatic gaze classification algorithms due to their ease of implementation.
- Subjects
ALGORITHMS; CLASSIFICATION algorithms; AUTOMATIC classification; STANDARD deviations; EYE tracking
- Publication
Journal of Eye Movement Research, 2019, Vol 12, Issue 8, p1
- ISSN
1995-8692
- Publication type
Article
- DOI
10.16910/jemr.12.8.3