Quantifying saccades while walking: Validity of a novel velocity-based algorithm for mobile eye tracking

Stuart, Samuel, Galna, Brook, Lord, Sue, Rochester, Lynn and Godfrey, Alan (2014) Quantifying saccades while walking: Validity of a novel velocity-based algorithm for mobile eye tracking. In: 2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, pp. 5739-5742. ISBN 978-1-4244-7929-0

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Official URL: https://doi.org/10.1109/EMBC.2014.6944931

Abstract

We validate a novel algorithm to detect saccades from raw data obtained during walking from a mobile infra-red eye-tracking device. The algorithm was based on a velocity threshold detection method, which excluded artefacts such as blinks and flickers using specific criteria. Mobile infra-red eye-tracking was performed with a group of healthy older adults (n=5) and Parkinson's disease (n=5) subjects. Saccades determined from raw eye tracker data obtained during walking using the algorithm were compared to a ground truth dataset defined as frame-by-frame visual inspection of raw eye-tracking videos. 100 trials from 10 subjects were analyzed and compared. The algorithm was highly reliable when compared to the ground truth (ICC(2,1) = 0.94), with an overall correct saccade detection percentage of 85%. This provides a simple yet robust algorithm for the analysis of mobile eye-tracking data.

Item Type: Book Section
Subjects: G900 Others in Mathematical and Computing Sciences
Department: Faculties > Engineering and Environment > Computer and Information Sciences
Depositing User: Becky Skoyles
Date Deposited: 23 Apr 2018 08:45
Last Modified: 23 Apr 2018 08:45
URI: http://nrl.northumbria.ac.uk/id/eprint/34072

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