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  • saccadic
  • The proposed saccadic circuitry establishes a complete model of saccade generation since it not only includes the neural circuits at both the premotor and motor stages of the saccade generator, but also uses a time-optimal controller to yield the desired saccade magnitude. (hindawi.com)
  • Brainstem saccadic circuitry, corroborated by several contributions of local field potentials (LFPs) to the dynamics of neuronal synaptic activity between three neural populations in generating horizontal and vertical saccades in two rhesus monkeys, was introduced by van Horn et al. (hindawi.com)
  • In contrast, visually-guided saccadic eye movements (saccades) can attenuate sway more than fixating gaze on an external target. (springer.com)
  • Blinks effectively remove saccadic inhibition and prematurely trigger impending saccades in reaction time tasks, thus providing a behavioral readout of the premotor plan. (jneurosci.org)
  • Ordinarily, a saccade is generated when underlying activity in the oculomotor circuit is robust enough to inhibit pontine omnipause neurons (OPNs), which gate the saccadic system by firing spikes at a tonic rate during fixation and becoming quiescent during saccades ( Keller, 1974 ). (jneurosci.org)
  • Note also the slowness of adducting saccades, with a pattern of intra-saccadic fatigue: the initial velocity of the saccade is good, but the eye quickly slows to a crawl in the middle of the movement. (neuroophthalmology.ca)
  • The inability to see your own saccadic eye movements is a simple yet powerful demonstration of saccadic suppression: You generally do not perceive events that occur while your eyes are moving, including (tautologically) your own saccades. (peerj.com)
  • O'Regan & NoĆ«, 2001 ), and here we use saccadic suppression as an umbrella term for various findings that show that vision is impaired around the time of saccades. (peerj.com)
  • The fit of the model to the kinematics of the saccades was determined by four parameters that are each a function of the saccadic displacement: the maximum collicular discharge, the maximum contralateral cerebellar discharge, the maximum ipsilateral cerebellar discharge and the timing of the onset of that discharge. (biomedcentral.com)
  • fixation
  • There is a primary distinction between the periods in which an area of the visual scene is kept on the fovea-a fixation-and periods in which an area of the visual scene is brought onto the fovea-a rapid eye position change called a saccade. (springer.com)
  • For example, in the schematic in Figure 1A , the subject makes a horizontal saccade from the fixation point (FP) to the horizontal target (T1) and then from that position makes a vertical saccade to the vertical target (T2). (arvojournals.org)
  • If there is no information that eye position has changed after the first saccade, the subject would make a diagonal saccade corresponding to the location of the second target with respect to the original starting fixation position ( Figure 1A , second saccade without CD). (arvojournals.org)
  • We compared the effects of gazing at a fixation point (FP) and performing saccades (SAC) on various spatial and temporal measures of the center of pressure (CoP) while participants stood as still as possible on a force plate. (springer.com)
  • Blinks
  • Blinks evoked at later times were accompanied with saccades to the correct end point location: the singleton on prosaccade trials and the opposite distractor on antisaccade trials. (jneurosci.org)
  • monkey
  • Recent studies on the monkey revealed that amplitude variations of the first saccade led to compensation by the second saccade, mediated by a corollary discharge. (arvojournals.org)
  • First, we replicated previous findings from the monkey: following first saccade amplitude variations, the direction of the second saccade compensated for the error. (arvojournals.org)
  • trigger
  • However, here we report that some visual stimuli are clearly visible during saccades, and trigger a constriction of the eye's pupil. (peerj.com)
  • prosaccade
  • In a prosaccade task, subjects are instructed to saccade their eyes to a peripheral target. (physiology.org)
  • A variant of the visual search paradigm, in which a feature singleton indicates that the correct saccade should be directed to it (prosaccade) or to the opposite distractor (antisaccade), has been influential in addressing this core topic. (jneurosci.org)
  • For example, the color or orientation of the singleton can indicate whether the correct saccade should be directed to it (prosaccade) or the opposite distractor (antisaccade). (jneurosci.org)
  • behavior
  • These results provide support for concurrent encoding of visuospatial attention and saccade preparation during visual search behavior. (jneurosci.org)
  • normal
  • Sagging Eye Syndrome: Older patients with divergence paralysis esotropia and normal horizontal ductions/saccades or small vertical deviations and no neurologic complaints may represent sagging eye syndrome from age-related orbital connective-tissue degeneration. (aao.org)
  • occurs
  • Here, we investigated whether such saccade-by-saccade compensation occurs in humans, and we made three new observations. (arvojournals.org)
  • The subject is in the dark and the targets are flashed rapidly so that by the time the first saccade occurs no visual cues are available. (arvojournals.org)
  • Preparation
  • The Pupil Reflects Motor Preparation for Saccades - Even before the Eye Starts to Move. (cnrs.fr)
  • Whether allocation of visuospatial attention can be divorced from saccade preparation has been the subject of intense research efforts. (jneurosci.org)
  • Thus, the relationship between visuospatial attention and saccade preparation remains unresolved. (jneurosci.org)
  • direction
  • In addition, LFP response amplitude of the SBNs was described as a function of saccade direction (in 400 saccades) by fitting Gaussian curves to data (see Figure 8(B) in [ 7 ]), indicating that the SBN LFPs can be fine-tuned over all the directed saccades. (hindawi.com)
  • Third, by examining oblique saccades, we are able to show that first saccade variations are compensated by adjustment in saccade amplitude in addition to direction. (arvojournals.org)
  • Together, our results demonstrate that it is likely that a corollary discharge in humans can be used to adjust both saccade direction and amplitude following variations in individual saccades. (arvojournals.org)
  • study
  • The study is a part of a long term program aiming to provide a complete characterization of saccades in DLB, AD patients and controls (national PHRC). (frontiersin.org)
  • The goals of this study were to determine whether the use of saccades could reduce the increased postural sway in a fatigued state and to better understand the contributions to fatigue-induced increased sway. (springer.com)
  • visual
  • In addition to providing this stability, the CD can also be used to guide saccades in cases where visual input is not available or is inadequate. (arvojournals.org)
  • results
  • Phrased differently, the retinal-image motion that results from saccades is suppressed, at least in the sense that it is not consciously perceived. (peerj.com)
  • task
  • This guidance of saccades based on an internally generated CD has been studied in both monkeys and humans using the double-step task introduced by Hallett and Lightstone ( 1976 ). (arvojournals.org)
  • In this task, the subject makes a saccade that depends on deriving the current position of the eye from the CD of the previous saccade. (arvojournals.org)