Abstract
The purpose of this study was to compare saccade detection characteristics in two mobile eye trackers with different sampling rates in a natural task. Gaze data of 11 participants were recorded in one 60 Hz and one 120 Hz mobile eye tracker and compared directly to the saccades detected by a 1000 HZ stationary tracker while a reading task was performed. Saccades and fixations were detected using a velocity based algorithm and their properties analyzed. Results showed that there was no significant difference in the number of detected fixations but mean fixation durations differed between the 60 Hz mobile and the stationary eye tracker. The 120 Hz mobile eye tracker showed a significant increase in the detection rate of saccades and an improved estimation of the mean saccade duration, compared to the 60 Hz eye tracker. To conclude, for the detection and analysis of fast eye movements, such as saccades, it is better to use a 120 Hz mobile eye tracker.
Highlights
The investigation of eye movements using eye tracking technology provides a powerful tool for different disciplines
The number of saccades undetected by the stationary eye tracker but detected by the mobile eye trackers was very low and ranged below 1% of the total number of correctly detected saccades
The data show that saccade detection was generally adequate in mobile eye trackers, the 120Hz eye tracker was better in measuring the duration of the saccade than the 60Hz eye tracker
Summary
The investigation of eye movements using eye tracking technology provides a powerful tool for different disciplines. Besides its role in scientific and clinical tasks, eye tracking applications are widely used for examining visual attention in marketing studies (Lahey & Oxley, 2016; Oliveira et al, 2016; Wedel, 2013), adapting learning behavior in real time situations (Rosch & VogelWalcutt, 2013) or to enhance the control modalities in computer games (Isokoski et al, 2009; Isokoski & Martin, 2006; Vickers et al, 2013). Saccadic eye movements and their statistics are of interest. Received January 17, 2017; Published June 07, 2017. Sampling rate influences saccade detection in mobile eye tracking of a reading task.
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