Angular Offset Distributions During Fixation are, More Often than Not, Multimodal

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dc.contributor.authorFriedman, Lee
dc.contributor.authorLohr, Dillon J.
dc.contributor.authorHanson, Timothy
dc.contributor.authorKomogortsev, Oleg
dc.date.accessioned2021-05-05T19:59:46Z
dc.date.available2021-05-05T19:59:46Z
dc.date.issued2021-06
dc.description.abstractTypically, the position error of an eye-tracking device is measured as the distance of the eye-position from the target position in two-dimensional space (angular offset). Accuracy is the mean angular offset. The mean is a highly interpretable measure of central tendency if the underlying error distribution is unimodal and normal. However, in the context of an underlying multimodal distribution, the mean is less interpretable. We will present evidence that the majority of such distributions are multimodal. Only 14.7% of fixation angular offset distributions were unimodal, and of these, only 11.5% were normally distributed. Of the entire dataset, 1.7% were unimodal and normal.) This multimodality is true even if there is only a single, continuous tracking fixation segment per trial. We present several approaches to measure accuracy in the face of multimodality. We also address the role of fixation drift in partially explaining multimodality.
dc.description.departmentComputer Science
dc.format.extent19 pages
dc.format.medium1 file (.pdf)
dc.format.medium1 file (.R)
dc.identifier.citationFriedman, L., Lohr, D., Hanson, T., & Komogortsev, O.V. (2021). Angular offset distributions during fixation are, more often than not, multimodal. Journal of Eye Movement Research,14(3):2.
dc.identifier.doihttps://doi.org/10.16910/jemr.14.3.2
dc.identifier.issn1995-8692
dc.identifier.urihttps://hdl.handle.net/10877/13485
dc.language.isoen
dc.publisherBern Open Publishing
dc.rights.licenseThis work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
dc.sourceJournal of Eye Movement Research, 2021, Vol. 14, No. 3 : 2.
dc.subjectaccuracy
dc.subjectmultimodality
dc.subjectdrift
dc.subjectmicrosaccades
dc.subjectgaze
dc.subjecteye movement
dc.subjecteye tracking
dc.subjectfixation
dc.subjectComputer Science
dc.titleAngular Offset Distributions During Fixation are, More Often than Not, Multimodal
dc.typeArticle

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