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  • next saccade
  • Although the basic networks for the programming and execution of saccades have been studied for decades ( 1 , 2 ), surprisingly little is known about the neural processes that underlie selection of the point of fixation of the next saccade. (pnas.org)
  • The landing point of the next saccade is the result of the lateral interaction between the peaks of activation. (arvojournals.org)
  • saccadic latency
  • Saccadic latency in human with different profiles of functional asymmetry depending on visual space complicity]. (nih.gov)
  • In PD, analysis of saccadic latency distributions, rather than mean latencies, can provide much more information about how the neural decision process that precedes movement is affected by disease or medication. (pubmedcentralcanada.ca)
  • Here we report two studies that provide information about these parameters, and demonstrate a novel effect of dopamine on saccadic latency, implying that it influences the neural decision process itself. (pubmedcentralcanada.ca)
  • We performed a detailed cross-sectional study of saccadic latency distributions during a simple step task in 22 medicated patients and 27 age-matched controls. (pubmedcentralcanada.ca)
  • A second study was undertaken on a different population specifically to investigate the effects of dopamine on saccadic latency distributions in 15 PD patients. (pubmedcentralcanada.ca)
  • The implications of these observations for the use of saccadic latency distributions as a potential biomarker of PD are discussed, as are the effects of l -dopa on neural decision making, where it is postulated to increase the criterion level of evidence required before the decision to move is made. (pubmedcentralcanada.ca)
  • spatial
  • Beginning ∼50 ms before a saccade toward a crowded object, we found that not only was there a dramatic reduction in the magnitude of crowding, but the spatial area within which crowding occurred was almost halved. (jneurosci.org)
  • A flexible stimulus-response association implemented within visual search offers the potential to dissociate spatial attention and saccade preparation. (jneurosci.org)
  • In the spatial domain, saccades are particularly affected when a distractor is presented close to the target. (arvojournals.org)
  • We observed that, while spatial attention in the prosaccade task was allocated only to the saccade goal, attention in the antisaccade task was allocated both to the cued location and to the antisaccade goal. (arvojournals.org)
  • humans
  • Effects of visual environment complexity on saccade performance in humans with different functional asymmetry profiles. (nih.gov)
  • Even though our findings confirm the existence of very-short-latency saccades in humans, it is questionable whether they represent a different population of saccades, as they were equally affected by the presence of distractors as are regular saccades. (arvojournals.org)
  • peak
  • Compared to visually-normal participants after 5 hours of blur, patients with anisometropic amblyopia had significantly longer and more variable saccade latency during amblyopic eye viewing, lower peak acceleration, and a longer acceleration phase during reaching, and a different temporal pattern of eye-hand coordination. (arvojournals.org)
  • participants
  • Participants then executed a corrective saccade to the target. (springer.com)
  • During a saccade, the array of disks rotated in such a way that participants had to execute a second (corrective) saccade to land on the target. (springer.com)
  • In two experiments, one cohort of participants underwent anti-saccade training, during which they repeatedly inhibited the reflexive impulse to look toward a briefly presented target. (springer.com)
  • Additionally, two active-control training groups were included, in which participants either trained on Pro-saccade or Fixation training regimens. (springer.com)
  • Consistently, it has been shown that eye movement latencies are reduced if participants have to perform a perceptual task at the saccade target (Montagnini & Chelazzi, 2005). (arvojournals.org)
  • reinforcement
  • We propose a model of saccade generation with reinforcement learning capabilities based on our previous BG and superior colliculus models. (frontiersin.org)
  • We investigated the effect of value differential on choice latency in pigeons, varying either just the delay of reinforcement associated with each alternative (Experiments 1-3), or varying both the delay and amount of reinforcement (Experiment 4). (abainternational.org)
  • concurrent
  • Here we assess concurrent changes in visual performance and perceived contrast before saccades, and show that saccade preparation enhances perception rapidly, altering early visual processing in a manner akin to increasing the physical contrast of the visual input. (jneurosci.org)
  • duration
  • The duration of single saccades depends on age to a lesser degree and does not change in patients with Parkinson's disease. (springer.com)
  • coordination
  • Our study fills an important gap in our understanding of eye-head coordination by combining these two approaches to compare gaze trajectories with and without whole-body rotations during saccades that are made when the head and body are fixed with respect to the chair. (jneurosci.org)
  • allocation
  • Whether allocation of visuospatial attention can be divorced from saccade preparation has been the subject of intense research efforts. (jneurosci.org)
  • time
  • The relative weights of salience and value are not constant but vary from eye movement to eye movement, depending critically on the availability of the value information at the time when the saccade is programmed. (pnas.org)
  • It is hypothesised that the effects of ME/CFS can be overcome briefly for completion of saccades, but that continuous pursuit activity (accurately tracking a moving object), even for a short time period, highlights dysfunctional eye movement behaviour in ME/CFS patients. (prohealth.com)