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Models of Horizontal Eye Movements, Part I - Early Models of Saccades and Smooth Pursuit (Paperback)
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Models of Horizontal Eye Movements, Part I - Early Models of Saccades and Smooth Pursuit (Paperback)
Series: Synthesis Lectures on Biomedical Engineering
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There are five different types of eye movements: saccades, smooth
pursuit, vestibular ocular eye movements, optokinetic eye
movements, and vergence eye movements. The purpose of this book is
focused primarily on mathematical models of the horizontal saccadic
eye movement system and the smooth pursuit system, rather than on
how visual information is processed. A saccade is a fast eye
movement used to acquire a target by placing the image of the
target on the fovea. Smooth pursuit is a slow eye movement used to
track a target as it moves by keeping the target on the fovea. The
vestibular ocular movement is used to keep the eyes on a target
during brief head movements. The optokinetic eye movement is a
combination of saccadic and slow eye movements that keeps a
full-field image stable on the retina during sustained head
rotation. Each of these movements is a conjugate eye movement, that
is, movements of both eyes together driven by a common neural
source. A vergence movement is a non-conjugate eye movement
allowing the eyes to track targets as they come closer or farther
away. In this book, early models of saccades and smooth pursuit are
presented. The smooth pursuit system allows tracking of a slow
moving target to maintain its position on the fovea. Models of the
smooth pursuit have been developed using systems control theory,
all involving a negative feedback control system that includes a
time delay, controller and plant in the forward loop, with unity
feedback. The oculomotor plant and saccade generator are the basic
elements of the saccadic system. The oculomotor plant consists of
three muscle pairs and the eyeball. A number of oculomotor plant
models are described here beginning with the Westheimer model
published in 1954, and up through our 1995 model involving a
4$^{th}$ order oculomotor plant model. The work presented here is
not an exhaustive coverage of the field, but focused on the
interests of the author. In Part II, a state-of-art model of the
saccade system is presented, including a neural network that
controls the system. Table of Contents: Introduction / Smooth
Pursuit Models / Early Models of the Horizontal Saccadic Eye
Movement System / Velocity and Acceleration Estimation / 1995
Linear Homeomorphic Saccadic Eye Movement Model
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