saccade

Definitions

  • WordNet 3.6
    • n saccade an abrupt spasmodic movement
    • n saccade a rapid, jerky movement of the eyes between positions of rest
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Webster's Revised Unabridged Dictionary
    • n Saccade (Man) A sudden, violent check of a horse by drawing or twitching the reins on a sudden and with one pull.
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Century Dictionary and Cyclopedia
    • n saccade In the manège, a violent check of a horse by drawing or twitching the reins suddenly and with one pull.
    • n saccade In violin-playing, a firm pressure of the bow on the strings, which crowds them down so that two or three can be sounded at once.
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Chambers's Twentieth Century Dictionary
    • n Saccade sa-kād′ a violent twitch of a horse by one pull: a firm pressure of the bow on the violin-strings so that two are sounded at once.
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Etymology

Webster's Revised Unabridged Dictionary
F
Chambers's Twentieth Century Dictionary
Fr.

Usage

In literature:

Toute la salle trepignait et le rire durait, repartant par saccade devant la mimique variee d'Arsay.
"Histoires grises" by E. Edouard Tavernier
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In science:

Upon consideration of this, saccades and fixations are factors to be noted which are both related to eye movements. For clicking purposes, the Eye GUIDE Clicker software was introduced.
Eye-GUIDE (Eye-Gaze User Interface Design) Messaging for Physically-Impaired People
The brain moves the eyes with quick saccadic movements.
A simple mechanism for balancing at the border of instability with applications to persistent neural activity
Between saccades, it keeps the eyes still by generating a continuous and constant contraction of the eye muscles; thus requiring a constant level of neural activity in the motor neurons controlling the eye muscles.
A simple mechanism for balancing at the border of instability with applications to persistent neural activity
During a saccade, a brief burst of neural activity in premotor command neurons induces a persistent change in the neural activity of the motor neurons, via a mechanism equivalent to integration in the sense of calculus.
A simple mechanism for balancing at the border of instability with applications to persistent neural activity
We illustrate this result on a particular example representative for saccadic eye movements.
A simple mechanism for balancing at the border of instability with applications to persistent neural activity
We consider the case of periodic saccadic eye movements asking for an action potential firing rate in the motor neurons alternating between 20 Hz and 60 Hz every second.
A simple mechanism for balancing at the border of instability with applications to persistent neural activity
At each saccade, a brief burst of neural activity in premotor command neurons changes the actual firing rate.
A simple mechanism for balancing at the border of instability with applications to persistent neural activity
We assume that this change is such that immediately after each saccade, the actual firing rate equals the desired firing rate.
A simple mechanism for balancing at the border of instability with applications to persistent neural activity
Between saccades, we assume that no input is applied 2 .
A simple mechanism for balancing at the border of instability with applications to persistent neural activity
If the neural integrator is perfectly tuned, then the actual firing rate will remain constant between saccades and equal to the desired firing rate (eyes are fixed).
A simple mechanism for balancing at the border of instability with applications to persistent neural activity
If the neural integrator is not perfectly tuned, then the actual firing rate will deviate from the desired firing rate (eyes drift) until a new saccade occurs which brings the actual firing rate to its new desired value.
A simple mechanism for balancing at the border of instability with applications to persistent neural activity
Clearly, after a short transient, the adaptation law achieves excellent tuning and the drift between two successive saccades becomes negligible.
A simple mechanism for balancing at the border of instability with applications to persistent neural activity
We assume that no feedback is applied to keep x at its desired level between saccades, which is consistent with experimental observations.
A simple mechanism for balancing at the border of instability with applications to persistent neural activity
Simulation of Eq. (1) with ˙µ = ε(−ax − bµ + c) and u(t) = Pti δ(t − ti ){xdesired (ti+) − x(ti−)}, where δ(·) represents the Dirac impulse and where the sum goes over all saccade times ti .
A simple mechanism for balancing at the border of instability with applications to persistent neural activity
It seems that the interactive effects for ordinary MV and SMV are similar in general, because the interactive processes accounting saccads are not stochastized; though it is not an undisputable fact that they are always identical (f.e. in a situation of the so–called ”lateral vision”).
Belavkin-Kolokoltsov Watch-Dog Effects in Interactively Controlled Stochastic Computer-Graphic Dynamical Systems. A Summary of Mathematical Researches
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