Models of Horizontal Eye Movements, Part 2: A 3rd-Order by John D. Enderle, Wei Zhou

By John D. Enderle, Wei Zhou

There are 5 forms of eye activities: saccades, delicate pursuit, vestibular ocular eye activities, optokinetic eye activities, and vergence eye routine. the aim of this e-book is concentrated totally on mathematical versions of the horizontal saccadic eye circulate procedure and the sleek pursuit procedure, instead of on how visible info is processed. A saccade is a quick eye flow used to obtain a aim by means of putting similar to the objective at the fovea. tender pursuit is a gradual eye stream used to trace a goal because it strikes by means of retaining the objective at the fovea. The vestibular ocular move is used to maintain the eyes on a aim in the course of short head hobbies. The optokinetic eye move is a mixture of saccadic and sluggish eye activities that retains a full-field snapshot solid at the retina in the course of sustained head rotation. every one of those activities is a conjugate eye circulation, that's, events of either eyes jointly pushed via a typical neural resource. A vergence stream is a non-conjugate eye flow permitting the eyes to trace pursuits as they arrive nearer or farther away. during this publication, a 2009 model of a state of the art version is gifted for horizontal saccades that's 3rd-order and linear, and regulated by way of a physiologically dependent time-optimal neural community. The oculomotor plant and saccade generator are the elemental parts of the saccadic process. The regulate of saccades is initiated through the very best colliculus and terminated by way of the cerebellar fastigial nucleus, and contains a posh neural circuit within the mid mind. This ebook is the second one a part of a booklet sequence on versions of horizontal eye events.

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Additional resources for Models of Horizontal Eye Movements, Part 2: A 3rd-Order Linear Saccade Model (Synthesis Lectures on Biomedical Engineering)

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A second peak velocity is observed in saccades with either a dynamic or glissadic overshoot. Data suggest that dynamic overshoot has a higher second peak velocity than glissadic overshoot. In fact, we show that the prominent second peak velocity may be caused by the antagonist PIRB. The antagonist parameters Fp3 , T4 , and τtac control the rebound burst and are determined by analyzing the relationships between them and the second peak velocity. 0125 |θ | N for θ < 0o where the eye position θ is always positive for the agonist and negative for the antagonist active-state tension.

12 illustrates the affect of agonist pulse magnitude, Fp1 , and duration, T2 − T1 , on Peak Velocity 1 under different activation time constants, τac , for an adducting 8◦ saccade. In this figure, the range of Fp1 comes from the fact that typical range of peak firing rate of motoneuron is 200-600 Hz. 8 N to 3 N. Tmv for the saccade is around 16 ms. Increasing the agonist pulse magnitude increases Peak Velocity 1. Increasing pulse duration increases Peak Velocity 1 until Tmv − T1 , after which the duration does not have much influence on peak velocity.

92 and the zero is 250 . 5 . 9 ms. 4 ms. Data and analysis of the monkey data is presented first in the next section. Following this, data and analysis of human data is presented, with inferences on neural control signals based on monkey. 6 MONKEY DATA AND RESULTS Data4 were collected from a rhesus monkey that executed a total of 27 saccades in our data set for 4◦ , 8◦ , 16◦ , and 20◦ target movements. , 1976. Size and distribution of movement fields in the monkey superior colliculus, Brain Research, vol.

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