Modeling Control of Saccadic Eye Movement in Presence of a Second Moving Target

fast eye movements of the eyes made to bring the fovea onto an object for detailed visual
analysis. In this work we have proposed a psycho-physiologically driven computational model
of the closed loop control of saccadic eye movements in the presence of a distractor. The
influence of the distractor on the saccade reaction time and the horizontal eye movement has
been investigated and compared with reported clinical data from literature. Some parts of
brain are involved in the saccadic eye movement such as: Superior colliculus (SC) and
brainstem (BS). A major part of our model is a combination of two parted models of superior
colliculus and brainstem. Superior colliculus and brainstem initiates and generates saccadic
eye movements, respectively. The intermediate layers of SC receive two types of signals:
visual (exogenous) and instructional (endogenous). This way, we describe the interaction
between the observer and the stimulant environment. We have applied an uncertainty to the
motor command enters to the BS from SC to model the tolerance of saccadic endpoint in the
presence of a distractor. Then, we have estimated the states of the eyes using a forward
model of eye positioning system. An optimal controller closes the feedback loop and
calculates (generates) the corrective saccades. Simulation results of the proposed model
agree with the reported clinical data from literature. The model is used in order to model eye
position in two successive saccade tasks. The eyes made the first saccade at the appearance
of the target and the second saccade at the appearance of the blink target. Simulation results
agree with the reported data from literature. Also we have used this model in order to
predict the eye behavior in two successive saccade tasks at the presence of the distractor.