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  • stimulus
  • Although saccades can occur in complete darkness, they are often elicited when something attracts attention and the observer directs the foveas toward the stimulus. (nih.gov)
  • position
  • With each saccade, the abducens neurons reach a new baseline level of discharge that is correlated with the position of the eye in the orbit. (nih.gov)
  • 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)
  • Early models of the spatiotemporal transformation assumed that the spatial concentration of cells projecting to the vertical and horizontal burst generators of the saccadic system varies systematically within the collicular map ( McIlwain, 1982 ). (jneurosci.org)
  • 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)
  • premotor
  • These studies provide abundant evidence that an SNN is well suited to evoke the properties of the firing patterns of the premotor neurons during the pulse and slide phases of a saccade. (hindawi.com)
  • antisaccades
  • In the laboratory, different types of saccade tasks have been designed to study the underlying mechanisms of pro- and antisaccades. (physiology.org)
  • To explain the antisaccade cost, Everling and Fischer (1998) argued for an important role of inhibition and proposed that antisaccades require two subprocesses: suppression of an automatic response and generation of a saccade in the opposite direction. (physiology.org)
  • behavior
  • The saccade neural network requires involvement of a series of neurons designed to imitate the behavior of actual neuronal populations in the horizontal saccade controller. (hindawi.com)
  • and (iii) ocular motor behavior in the visual search tasks is similar for dyslexic children and for typical readers, except for the disconjugacy during and after the saccade: dyslexic children are impaired in comparison to typical children. (frontiersin.org)
  • These results provide support for concurrent encoding of visuospatial attention and saccade preparation during visual search behavior. (jneurosci.org)
  • duration
  • It is concluded that the neural network is constrained by a minimum duration of the agonist pulse and that the most dominant factor in determining the saccade magnitude is the number of active neurons for the small saccades. (hindawi.com)
  • The duration of single saccades depends on age to a lesser degree and does not change in patients with Parkinson's disease. (springer.com)
  • We used standard stimulus trains of 350 msec duration, 200 Hz pulse rate, and intensity set at two times saccade threshold in all experiments. (jneurosci.org)
  • 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)
  • predictive
  • Here, we tested whether spatio-temporal predictions are updated before, during, or shortly after an inter-hemifield saccade is executed, and thus, whether the predictive signal is transferred swiftly across hemifields. (frontiersin.org)
  • neurons
  • A neural network model of biophysical neurons in the midbrain is presented to drive a muscle fiber oculomotor plant during horizontal monkey saccades. (hindawi.com)
  • We counted boutons deployed in regions of the paramedian pontine reticular formation reported to contain long-lead and medium-lead burst neurons of the horizontal burst generator. (jneurosci.org)
  • Compared to a rostral SC site, the excitation of a caudal SC site should then engage a larger number of SC neurons projecting to the horizontal saccade generator in the PPRF, and such a gradient would account for the spatiotemporal transformation in the horizontal plane. (jneurosci.org)
  • spatial
  • A flexible stimulus-response association implemented within visual search offers the potential to dissociate spatial attention and saccade preparation. (jneurosci.org)
  • characteristics
  • According to the data obtained, the saccade characteristics depend on the age in both the subjects without neurological symptoms and parkinsonian patients. (springer.com)
  • tasks
  • As a first step, here we report a study of saccades in the gap and overlap tasks in a group of DLB patients and age-matched controls. (frontiersin.org)
  • reticular
  • Examination of the horizontal saccades shows a significant slowing of the saccades, more to the left than to the right, indicating a bilateral deficit of the paramedian pontine reticular formation, more on the left than on the right side. (neurocular.com)
  • brainstem
  • The OMV, through the caudal fastigial nuclei, interacts with the brainstem to provide adaptive saccade gain corrections that minimize the visual error in reaching a given target location. (frontiersin.org)
  • cerebellum
  • As a first step to identify the pathway that transmits the error signal for motor learning in saccades, we investigated the effect of local microstimulation in the medial part of the mesencephalic tegmentum, a region that contains fibers from two candidate structures that instruct the cerebellum, superior colliculus, and parvocellular red nucleus. (jneurosci.org)
  • prosaccade
  • 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)
  • 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)
  • 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)
  • typically
  • Children (aged 5-18 years) with FASD ( n = 71) and typically developing controls ( n = 113) performed a visually-guided saccade task. (frontiersin.org)
  • Typically, a saccade is then directed to the selected stimulus, although the ability to cancel the movement or look elsewhere is also valuable. (jneurosci.org)
  • movement
  • The eye movement was slow on horizontal gaze, but normal. (harvard.edu)
  • Here, we assess eye movement measures obtained during the performance of a visually-guided saccade task as a possible screening tool for use in children with FASD. (frontiersin.org)
  • To generate a different saccade, the default movement plan has to be canceled and a new motor command programmed. (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)
  • trials
  • Therefore, we conducted additional analyses including only those trials in which the first saccade successfully reached the target within a ± 1° window. (frontiersin.org)