Nonlinear Dynamical Analysis of Eye Movement Characteristics
Authors: Atsuo MURATA, Tomoya MATSUURA, Makoto MORIWAKA
Abstract: The purpose of this study was to clarify eye movement characteristics during a visual search using nonlinear dynamics (scaling properties). More concretely, the fractal dimensional analysis by means of the box-counting technique was carried out for the time series data of x- and y-directional gaze-locations. The eye movement characteristics during two types of search tasks were measured and analyzed. It tended that the search time increased with the increase in task difficulty such as the display range and the layout complexity. For both x- and y-directional eye movements, it tended that the scaling property represented by the fractal dimension increased with the increase of difficulty of a search task. The fractal dimension also tended to be smaller for the wide display than for the narrow display. On the basis of the result that the search time and the x- and y-directional fractal dimensions were not so strongly related, we inferred that the search time and the fractal dimension stem from the different mechanism underlying a variety of search activities.
Keywords: Eye Movement, Search Task, Search Time, Nonlinear Dynamics, Fractal Dimension
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