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Mikko Berg, Ilpo Kojo, Jaana Simola, Jukka Häkkinen; The structure of fixational eye movements during straight gaze path. Journal of Vision 2005;5(8):589. doi: 10.1167/5.8.589.
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© ARVO (1962-2015); The Authors (2016-present)
Human gaze path consist of rotation to redirect the focus of foveal vision for the perception with better resolution. The gaze has macro structure with well-known division to fixational and saccadic phases according to spatial and temporal behavior characteristics. Our experiments compared the Fixational Eye Movements (FEMo) in the context of continuous horizontal and vertical movement. A matrix of arrowheads among T-letter shaped icons were used to construct a path that the subjects tried to follow. The eye movements were recorded with EyeLink II equipment having 250 Hz temporal resolution. The fixations (number= 5947, duration 236 ms, sd=66) were first classified qualitatively according to speed. The later comparison allowed us to rely on quantitative categorizations done by the EyeLink. As a result, there was dominant vertical FEMos in context of horizontal saccadic movement and horizontal FEMos in vertical case. We also observed several qualitative modes of movement: 1) gradual accelerations, 2) abrupt saw-tooth shape, and 3) loops. More detailed quantitative analysis will be presented in the poster. Thus, there are several different micro structures in FEMos related to different saccadic macrostructures.
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