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Running head : Ternary Eye Movement Classification Automated Classification and Scoring of Smooth Pursuit Eye Movements in Presence of Fixations and Saccades

Ternary eye movement classification, which separates fixations, saccades, and smooth pursuit from the raw eye positional data, is extremely challenging. This paper develops new and modifies existing eye tracking algorithms for the purpose of conducting meaningful ternary classification. To aid this purpose a set of qualitative and quantitative behavior scores is introduced to facilitate the assessment of classification performance and to provide means for the automated threshold selection. Experimental evaluation of the proposed methods is conducted using eye movement records obtained from 11 subjects at 1000Hz in response to a step-ramp stimulus eliciting fixations, saccades, and smooth pursuits. Results indicate that a simple hybrid method that incorporates velocity and dispersion thresholding allows producing robust classification performance. It is concluded that behavior scores are able to aid automated threshold selection for the algorithms capable of successful classification.