Parameter Estimation of Auditory Saccades and Visual Saccades

Saccadic eye movements induced by visual stimuli (V-saccade), auditory stimuli (A-saccade) and auditory-visual stimuli (AV-saccade) were recorded and analyzed. SMI Hi-Speed eye tracking system was used to collect human saccade data. A FORTRAN program designed to compute parameter estimates for a 1D saccadic eye movement model was used for data analysis. The controller for saccadic eye movements in response to the three different types of stimuli were compared. System parameters of agonist pulse and post-inhibitory rebound burst (PIRB) in the antagonist motoneurons that caused post-saccade phenomena were also estimated. A-saccade exhibited lower agonist pulse magnitude and longer agonist pulse duration in large saccade amplitude. Antagonist onset delay was longer in A-saccade for saccades of the same size. There was a higher incidence of dynamic overshoot in A-saccade, while more in the abducting than adducting direction.