  A stochastic optimal control based model with velocity tracking and internal
feedback for saccadic eye movements is presented in this paper. Recent evidence
from neurophysiological studies of superior colliculus suggests the presence of
a dynamic input to the saccade generation system that encodes saccade velocity,
rather than just the saccade amplitude and direction. The new evidence makes it
imperative to test if saccade control can use a desired velocity input which is
the basis for the proposed velocity tracking model. The model is validated
using behavioral data of saccades generated by healthy human subjects. It
generates trajectories of horizontal saccades made to different amplitudes as
well as predicts vertical and oblique saccade behavior. This paper presents the
first-ever model of the saccadic system in an optimal control framework using
an alternate interpretation of velocity-based control, contrary to the dominant
end-point based models available in the literature.
