Saccadic eye movements saccades eye movements. Medical search. Frequent questions

This damage normally happens in the oculomotor nucleus of the midbrain As in horizontal saccadic palsy, the saccades are stopped or slowed from the disrupted pathway, only in this case the signal is disrupted before it reaches the PPRF. (wikipedia.org)
By taking advantage of our ability to interpret the environment and monitor our own cognitive states, predictive eye movements serve a vital role in natural oculomotor behavior. (visionsciences.org)
With normal foveal vision, the oculomotor system continually brings targets of interest onto the fovea with saccadic eye-movements. (visionsciences.org)
Rather than selecting the optimal retinal locus for every saccade, the oculomotor system opts for a minimal change in its control strategy by adopting a single retinal locus for all saccades. (visionsciences.org)
Under this assumption, the psychophysical data on perisaccadic compression can be appreciated intuitively by imagining that, around the time of a saccade, the brain confounds nearby oculomotor and sensory signals while attempting to localize the position of objects in visual space. (jneurosci.org)
The frontal eye field (FEF) and superior colliculus (SC) contribute to saccadic eye movement generation, and much of the FEF's oculomotor influence may be mediated through the SC. (duke.edu)
While visual orienting and attentional engagement were relatively preserved in individuals with autistic spectrum disorder, overall these findings provide evidence that abnormal oculomotor behavior in autistic spectrum disorder reflects an altered sensorimotor control due to cerebellar abnormalities, rather than a deficit in the volitional control of eye movements. (ed.gov)
To further investigate whether the basal ganglia actually influence error-based learning, we reversibly inactivated the oculomotor portion of the substantia nigra pars reticulata (SNr) in two monkeys and tested saccade adaptation. (eneuro.org)
Thus, our data suggest that the oculomotor SNr assists saccade adaptation by strengthening the error signal. (eneuro.org)
Here, we address this question by showing that inactivation of the oculomotor basal ganglia influences the saccade motor learning, a well-established error-based motor learning model. (eneuro.org)

Lesions anywhere in the abducens nucleus, cranial nerve VI neurons, or interneurons can affect eye movement towards the side of the lesion. (wikipedia.org)
PD has been traditionally considered as a pure movement disorder secondary to focal degeneration of dopaminergic neurons in the substantia nigra, but, in recent years, the clinical phenotype has been better illuminated, showing that PD is a multisystem neurodegenerative disorder with motor and nonmotor features (Table 1 ) [ 3 ]. (hindawi.com)
Computational models provide a framework through which to understand how distinct populations of neurons select targets for gaze shifts, control the initiation of saccades and monitor the outcome of gaze behavior. (visionsciences.org)
In anticipation of each saccade, many neurons in the visual system shift their receptive fields. (duke.edu)
We previously showed that macaque caudal intraparietal (CIP) area neurons possess robust 3D visual representations, carry choice- and saccade-related activity, and exhibit experience-dependent sensorimotor associations (Chang et al. (elifesciences.org)
Here, we map the receptive fields of macaque area V4 neurons during saccadic eye movements and find that receptive fields are remarkably dynamic. (mpg.de)
The object value signals in the CDt and SNr are likely used for controlling saccadic eye movements, because many of the SNr neurons projected to the superior colliculus and electrical stimulation in the CDt induced saccades. (mit.edu)

Saccades are the type of eye movement used to move the fovea rapidly from one point of interest to another, while a fixation is the period of time where the eye is kept aligned with the target for a certain duration, allowing for the image details to be processed. (pursuantmedia.com)
Anticipatory behavior is also seen in saccades, where subtle adjustments in fixation time are made on the basis of the expected difficulty of the visual discrimination. (visionsciences.org)
A screen-based eye tracker for extensive research from fixation-based studies to micro-saccades. (tobii.com)
This powerful research system supports from fixation to saccade-based research outside of the lab. (tobii.com)
By coding the Cookie Theft picture into areas of interest, the researchers fused eye tracking data - fixation, saccades, and pupil size - with language data. (tobii.com)
The main question was how different types of cues (reflexive/intentional) guide the spatial attention during fixation or during the preparation phase of a saccade. (uni-muenchen.de)
All discrimination tasks were performed during the preparation of the saccade to the cued target and also during fixation. (uni-muenchen.de)
The results of the control subjects showed that discrimination of the character is always better at the cued side irrespective of the eye movement condition or the cue relevance, suggesting that spatial attention is engaged at the cued location even under fixation conditions and irrespective of the relevance of the cue. (uni-muenchen.de)
Gaze" is the fixation of the eyes on an object or location within 3 degrees of visual angle for 100ms (0.1 seconds). (doncurrie.com)
For both fixation and tracking, a total of a minimum 180ms is required to see an object AND initiate movement. (doncurrie.com)
To fill this gap, we administered a countermanding task to 15 healthy participants in which they were asked to observe the eye region of a face with the eyes shut appearing at central fixation. (uniroma1.it)

citation needed] A lesion, which is an abnormality in tissue due to injury or disease, can disrupt the transmission of signals from the brain to the eye. (wikipedia.org)
The paramedian pontine reticular formation(PPRF), also in the pons is responsible for saccadic movement, relaying signals to the abducens nucleus. (wikipedia.org)
Effective control of eye movements relies on more than the analysis of sensory signals. (visionsciences.org)
For example: Anticipatory smooth pursuit eye movements in the direction of upcoming future target motion are elicited by symbolic cues that disclose the future path of moving targets, as well as (for self-moved targets) signals that represent our own motor plans. (visionsciences.org)
When these estimates are informed by vision, the brain must combine retinal information with extraretinal signals that encode the position of the eye, head, and body to obtain accurate representations of objects in space. (jneurosci.org)
Composition and topographic organization of signals sent from the frontal eye field to the superior colliculus. (duke.edu)
Sensorimotor associations between 3D orientation and saccade direction preferences were stronger in CIP than V3A, and moderated by choice signals in both areas. (elifesciences.org)
Together, the results explicate parallel representations, hierarchical transformations, and functional associations of visual and saccade-related signals at a key juncture in the 'where' pathway. (elifesciences.org)
This thesis investigates the ability of active perception to redirect predictive signals to new retinotopic locations with saccades. (gla.ac.uk)
A psychophysical study is presented in Chapter 2 which provides evidence for the transference of predictive signals across saccades. (gla.ac.uk)
Importantly, the detection advantage for in-time targets was found 50 - 100 ms after saccade indicating transference of predictive signals across saccade. (gla.ac.uk)
According to the first hypothesis, the suppression starts from the motor signals that also trigger the eye movement. (bernstein-network.de)
Little is known about the interaction between gaze direction signals and volitional inhibition of saccades. (uniroma1.it)

Reflexogenic eye movements should be compared with volitional eye movements. (todaysgeriatricmedicine.com)
Other temporal illusions arising in the context of movement (e.g., "intentional binding") appear to depend upon the volitional nature of the preceding motor act. (mit.edu)
Here we assess chronostasis across different saccade types, ranging from highly volitional (self-timed saccades, antisaccades) to highly reflexive (peripherally cued saccades, express saccades). (mit.edu)
Nevertheless, people can exert volitional inhibitory control on saccadic eye movements both during their initiation and their planning. (uniroma1.it)

Depending on where you experience the discomfort, eye pain can fall into one of two categories: Ocular pain occurs on the eye's surface, and orbital pain occurs within the eye. (pursuantmedia.com)
There are four basic types of eye movements: saccades, smooth pursuit movements, vergence movements, and vestibulo-ocular movements. (pursuantmedia.com)
Ocular pain refers to discomfort around the outside of the eye, while orbital pain is usually felt deep behind the eye. (pursuantmedia.com)
Orbital pain also tends to be less sharp than ocular, although it can be caused by a variety of serious eye diseases. (pursuantmedia.com)
Thus, ocular movements are generally not a contributing factor in dyslexic patients. (medscape.com)
Studies have shown that decreased ocular motor function can be an early sign of Parkinson's and other neurodegenerative disorders .5 Assessing eye movement can not only reveal the signs of disease, dysfunction, or degeneration that might have otherwise been missed but also monitor some of those neurodegenerative conditions known to be present. (todaysgeriatricmedicine.com)
Reflexes that involve eye movements are the optokinetic reflex and the vestibular ocular reflex. (todaysgeriatricmedicine.com)
As patients move their heads in different positions, their eyes are assessed to determine whether they move in an equal and opposite direction-this is the vestibular ocular reflex. (todaysgeriatricmedicine.com)
Adaptation of saccadic and vestibulo-ocular systems after extraocular muscle tenectomy. (ox.ac.uk)
Adaptation of saccadic magnitude and vestibulo-ocular reflex gain (VOR) was examined in six monkeys that had undergone a tenectomy of the medial and lateral recti of one eye. (ox.ac.uk)
Thus, the saccadic and vestibulo-ocular systems can be adapted in both a conjugate and a selective or nonconjugate fashion. (ox.ac.uk)

Wemeasured the adaptation field for two different saccade adaptations (14 deg to 20deg and 20 deg to 26 deg) by testing transfer to 34 different target positions. (pisavisionlab.org)

For example, a person with a horizontal saccadic palsy may jerk their head around while watching a movie or high action event instead of keeping their head steady and moving their eyes, which usually goes unnoticed. (wikipedia.org)
Someone with a nonselective horizontal gaze palsy may slowly rotate their head back and forth while reading a book instead of slowly scanning their eyes across the page. (wikipedia.org)
The cranial nerve VI also has interneurons connecting to the medial rectus, which controls horizontal eye movement towards from the midline of the body. (wikipedia.org)
Lesions on both sides of the abducens nucleus can cause a total loss of horizontal eye movement. (wikipedia.org)
One other type of gaze palsy is a horizontal saccadic palsy. (wikipedia.org)
Lesions in the PPRF cause what would be saccadic horizontal eye movements to be much slower or in the case of very severe lesions, nonexistent. (wikipedia.org)
This can also cause slowed horizontal saccadic movements and failure for the eye to reach its target location during saccades. (wikipedia.org)
As seen in horizontal saccadic palsy, the impairment of the contralateral side gaze is caused by the disrupted pathways coming from the PPRF, while the "half" impairment is from the signal passing through the medial longitudinal fascicles not being able to reach its target. (wikipedia.org)
Eye movement data were analyzed based on a 3rd-order linear horizontal saccadic eye movement model, where the inputs to the muscle were agonist and antagonist active-state tensions that were described by pulse-slide-step waveforms with a post inhibitory rebound burst (PIRB) based on a timeoptimal controller. (longdom.org)
The horizontal saccadic eye movements, optokinetic nystagmus, saccadic eye movement evoked potentials as well as saccadic eye movement related potentials we recorded in the groups of outpatients suffering from depressive symptoms and panic disorder respectively. (nel.edu)
In this work, saccades induced by visual, auditory and auditory-visual bisensory stimuli that provided in a horizontal plane were recorded and analyzed. (uconn.edu)
It increased with increases of the horizontal component of the saccade andremained largely constant with deviation of the vertical component of the saccade.Mislocalization of probes inside the adaptation field was correlated with the amountof adaptation of saccades to the probe location. (pisavisionlab.org)
We present a simplified review the anatomy of horizontal and vertical saccades, discuss practical aspects of their examination, and review saccadic abnormalities in hyperkinetic and hypokinetic movement disorders. (hmto-hnas.com)

At the time of the observation I knew about saccades, but I had not heard of the divisions within such as large, small, minor, mini and micro saccades. (astropix.com)

Possible PSP requires the presence of a gradually progressive disorder with onset at age 40 or later, either vertical supranuclear gaze palsy or both slowing of vertical saccades and prominent postural instability with falls in the first year of onset, as well as no evidence of other diseases that could explain these features. (neurology.org)

The adaptive lengthening and shortening of reactive and voluntary saccades rely on partially separate neural substrates. (ox.ac.uk)
In 4 separate sessions, reactive and voluntary saccades were adaptively shortened or lengthened. (ox.ac.uk)
Indeed, gaze direction has a significant impact on the execution of voluntary saccades of an observer since it is capable of inducing in the observer an automatic gaze following behaviour: a phenomenon named social or joint attention. (uniroma1.it)

Described eye movement abnormalities include saccadic pursuit, difficulty initiating saccades, and rarely supranuclear palsy. (cmdg.org)
Abnormalities and disturbances of saccadic and pursuit eye movements were studied in several mental disorders and diseases. (nel.edu)
The presence of characteristic saccadic abnormalities can be enormously helpful in guiding diagnosis in the outpatient clinic. (hmto-hnas.com)
Further, we provide an algorithm illustrating the value of saccadic abnormalities in the differential diagnosis of the movement disorders patient. (hmto-hnas.com)

For lab environments, our screen-based eye trackers, Tobii Pro Spectrum and Tobii Pro Fusion, produce visual stimuli on a screen and work together with Tobii Pro Lab to deliver insights on study participant reactions. (tobii.com)
Here, we show that the magnitude of perceptual compression for a wide variety of probe stimuli and saccade amplitudes is quantitatively predicted by a simple heuristic model based on the geometry of retinotopic representations in the primate brain. (jneurosci.org)
An increased activation was found for spatiotemporally unpredictable stimuli directly after eye-movement, indicating the predictive feedback was projected to the new retinotopic region with saccade. (gla.ac.uk)
These spatiotemporal dynamics may enhance information processing of relevant stimuli during the scanning of a visual scene, thereby assisting the selection of saccade targets and accelerating the analysis of the visual scene during free viewing. (mpg.de)
A saccadic eye movement can be triggered by either visual or auditory stimuli. (uconn.edu)
Saccade characteristics were investigated, and the results of saccadic eye movements elicited by the three different stimuli types were compared. (uconn.edu)

The relation between covert and overt spatial attention and saccadic eye movements was investigated in control subjects, Parkinson's Disease (PD) patients, and cerebellar patients in a dual-task paradigm. (uni-muenchen.de)
In the double task, also cerebellar patients showed an intentional saccade impairment that correlates with the deficit in the attentional control. (uni-muenchen.de)
Error-based motor learning, such as learning to use a robotic arm or make accurate saccades, has been regarded as a cerebellar function. (eneuro.org)
In contrast, error-based learning, such as used for correcting inaccurate movements, has been regarded as a cerebellar function. (eneuro.org)

Measure the brain's ability to execute or suppress reflexive eye movements with saccade and anti-saccade tests. (tobii.com)
Casana-Perez, Susana Maria (2004): Control of attention before reflexive and intentional saccades. (uni-muenchen.de)

Trained monkeys performed a two-choice perceptual decision-making task in which they reported the perceived orientation of a dynamic Glass pattern, before and after unilateral, reversible, inactivation of a brainstem area-the superior colliculus (SC)-involved in preparing eye movements. (nature.com)

However, despite the fact that eye movements are critical during normal vision, the influence of eye movements on the structure of receptive fields has never been characterized. (mpg.de)
Specifically, before the initiation of a saccadic eye movement, receptive fields shrink and shift towards the saccade target. (mpg.de)

Fovea-small area of the retina at the back of the eye where images are reflected / inverted for transmission to the brain. (doncurrie.com)
[ 4 , 5 , 6 ] Fusional convergence and divergence are optomotor reflexes that are designed to position the eyes such that the image of regard falls on the fovea of each eye. (medscape.com)

Saccades shift the spotlight of attention. (pursuantmedia.com)
In one condition, participants were required to suppress a saccade, that was previously instructed by a gaze shift toward one of two peripheral targets, when the eyes were suddenly shut down (social condition). (uniroma1.it)

In this study, we examined the accuracy and dynamics of visually guided saccades in 20 adults with autism spectrum disorder, as compared to 20 typically developed adults using the Step/Overlap/Gap paradigms. (ed.gov)
Saccadic eye movements are simple, visually guided actions. (northumbria.ac.uk)

RESULTS: On eye movement testing, family members demonstrated saccadic hypometria, reduced steady-state pursuit gain, and a higher rate of voluntary response inhibition errors relative to controls. (ku.edu)
In all conditions PDs showed multi-stepping/hypometria of saccades consistent with a motoric deficit in executing actions based on cognitive cues. (lincoln.ac.uk)

In the other experiment, a different group of subjects used eye movements to control a highlighted ring, which marked the edge of the simulated scotoma, to make contact with a small target disc, which was randomly placed on the screen in each trial. (visionsciences.org)
In order to explore the influence of the eye movement trigger itself, the scientists conducted an experiment in which the test subjects either moved their eyes over an object or kept their eyes still while the object was moving. (bernstein-network.de)
In part 1 of each experiment, participants were rewarded for making a saccade to one hemifield. (northumbria.ac.uk)
There were no hemifield-specific effects of the reward on saccade latency on the remote distractor effect or antisaccades, although the reward was associated with an overall slowing of saccade latency in Experiment 1. (northumbria.ac.uk)

Parameter estimations were calculated using the system identification technique for saccade parameters and neural inputs. (longdom.org)

The role of prediction and expectations in the planning of smooth pursuit and saccadic eye movements. (visionsciences.org)
Eye movements - saccades or smooth pursuit - ensure that the line of sight remains near objects of interest, thus establishing the retinal conditions that support high quality vision. (visionsciences.org)

They also showed lateralized deficits in procedural learning and open-loop pursuit gain (initial 100 milliseconds of pursuit) and increased variability in the accuracy of large-amplitude saccades that were confined to rightward movements. (ku.edu)
Here, sequences of two saccades were recorded before and after adaptation of rightward saccades. (ox.ac.uk)
We found that the second saccade of the sequence always remained accurate and compensated for the adaptive changes of the first rightward saccade size. (ox.ac.uk)

Conjugate gaze palsies are neurological disorders affecting the ability to move both eyes in the same direction. (wikipedia.org)
Symptoms of conjugate gaze palsies include the impairment of gaze in various directions and different types of movement, depending on the type of gaze palsy. (wikipedia.org)
A patient may be diagnosed with a conjugate gaze palsy by a physician performing a number of tests to examine the patient's eye movement abilities. (wikipedia.org)
However, sometimes a patient exhibits an abduction nystagmus in both eyes, indicating evidence of a conjugate gaze palsy. (wikipedia.org)
Binocular eye movements are either conjugate (versions) or disconjugate (vergences). (medscape.com)
After the tenectomy, when the normal eye was patched, a conjugate increase in saccadic magnitude and VOR was observed in both eyes. (ox.ac.uk)

One required them to perform only pro-saccade responses (pure pro-saccade task). (nottingham.ac.uk)

For example, visuospatial attention engages a frontoparietal network including the frontal eye fields (FEFs), which modulate activity in visual sensory areas to enhance the representation of an attended visual object. (frontiersin.org)
Kish was born with bilateral retinoblastomas, tiny cancers of the retina, which is part of the eye responsible for sensing visual information. (discovermagazine.com)
Alternative computational models are evaluated based on fits to performance of macaque monkeys and humans guiding and controlling saccades during visual search and stopping tasks. (visionsciences.org)
Eye movements must also be sensitive to high-level decisions about which regions of the environment deserve immediate attention and visual analysis. (visionsciences.org)
Ophthalmology - visual field, lazy eye, and strabismus. (tobii.com)
Such gaze shifts are themselves a source of powerful retinal stimulation, and so the visual system appears to have evolved mechanisms to maintain perceptual stability during movements of the eyes in space. (jneurosci.org)
Specifically, we propose that perisaccadic compression is determined by the distance between the probe and saccade end point on a map that has a logarithmic representation of visual space, similar to those found in numerous cortical and subcortical visual structures. (jneurosci.org)
We accurately perceive the visual scene despite moving our eyes ~3 times per second, an ability that requires incorporation of eye position and retinal information. (duke.edu)
AGT points to strong links between attention, eye movements, visual memory, and scene perception. (ubc.ca)
It also supports the idea that trans-saccadic memory is exactly the limited store used by other visual processes. (ubc.ca)
Attempts to overcome these visual defects through various eye training exercises to improve visual perception of written letters and words has not proven effective in treating dyslexia, dyspraxia, or dyscalculia problems. (medscape.com)
Due to the nature of vision, we rapidly sample our visual environment using ballistic eye-movements called saccades. (gla.ac.uk)
The assumption of predictive feedback relocation in V1 with saccades is highlighted alongside the effects of saccades within the early visual system, which leads to the motivation and introduction of the research chapters. (gla.ac.uk)
and second, there is an established behavioral paradigm that causes an adaptation of saccade size by providing an apparent visual error ( McLaughlin, 1967 ). (eneuro.org)
The strong connection between the visual system, the brain, and the spine leads patients to compensate for shortcomings in eye movement by adjusting their body positions or posture. (todaysgeriatricmedicine.com)
Good posture and good balance rely in part on accurate vision, which encompasses not just static visual acuity but also eye movement control-dynamic vision. (todaysgeriatricmedicine.com)
Postural test included quiet stance on a force platform under two visual conditions (saccades and fixatio. (researchgate.net)
Saccadic chronostasis refers to the subjective temporal lengthening of the first visual stimulus perceived after an eye movement, and is most commonly experienced as the "stopped clock" illusion. (mit.edu)
Among other things, the scientists were able to show that the visual signal is already suppressed when it leaves the eye. (bernstein-network.de)
The researcher used sophisticated "mobile eye trackers" with both elite and "near-elite" athletes participating in a variety of sports like volleyball, baseball, cricket and table tennis to detect and monitor the points of visual focus throughout a sports activity. (doncurrie.com)
ONLY when the eyes are fixated on an area or location within 3 degrees of visual field for longer than 100 mms can the individual process the information provided by that object or person necessary to initiate action. (doncurrie.com)
Saccades are rapid eye movement that shifts the center of gaze from one part of the visual field to another. (astropix.com)
The King-Devick (K-D) test of rapid number naming is a visual performance measure that captures saccadic eye movements. (elsevierpure.com)
The 25-Item National Eye Institute Visual Functioning Questionnaire (NEI-VFQ-25) and its 10-Item Neuro-Ophthalmic Supplement measured vision-specific quality of life (VSQOL). (elsevierpure.com)
The K-D test and its requisite eye movements capture VSQOL and make rapid number naming a strong candidate efferent visual performance measure in MS. (elsevierpure.com)

Vertical vergence movements may also occur (ie, one eye moving upward or the other eye moving downward relative to the contralateral eye). (medscape.com)
More than half of patients that are enrolled in a Vision Therapy program with me have a vergence (which means eye coordination) problem. (familyeyecarecentre.com)

Additionally, patients with Parkinson's disease, a basal ganglia deficit, show slower saccade adaptation than age matched controls. (eneuro.org)

Adaptive shortening of a saccade influences the metrics of other saccades withina spatial window around the adapted target. (pisavisionlab.org)
I decided to run a few short experiments that could test the basic eye-tracking metrics: point-of-regard estimation accuracy and precision, saccade trajectory and velocity, and changes pupil size. (pygaze.org)

Saccade amplitude transition function (ATF) and response latency indicated the saccade programming mechanism. (longdom.org)
Operant conditioning of specific saccade directions can reduce the latency of eye movements in the conditioned direction. (northumbria.ac.uk)
In both experiments, the reward produced a significant facilitation of saccadic latency for prosaccades directed to the rewarded hemifield. (northumbria.ac.uk)

Non-rhythmic vibrissae movements also serve many behavioral processes, such as social interactions (Wolfe et al. (scholarpedia.org)
Designed for the real world, our third-generation wearable eye tracker allows you to conduct behavioral research in a wide range of settings. (tobii.com)

Recent studies of sensorimotor processing have benefited from decision-making paradigms that emphasize the selection of appropriate movements. (duke.edu)

By contrast, on the pure pro-saccade task the TS group were shown to be significantly slower to initiate and to complete the saccades (longer movement duration and decreased peak velocity) than controls, while movement amplitude and direction accuracy were not different. (nottingham.ac.uk)
In particular, the inactivation facilitated the amplitude decrease adaptation of ipsiversive saccades. (eneuro.org)
Consistent with previous studies, no effect was seen on the amplitude of the ipsiversive saccades when we did not induce adaptation. (eneuro.org)

The optokinetic reflex reveals whether the eyes have a quick and a slow phase. (todaysgeriatricmedicine.com)

The magnitude of innervation is determined by the fixating eye, which means that the angle of deviation between eyes ( strabismus ) may vary depending on which eye is fixating. (medscape.com)
Subsequent unpatching resulted in selective (nonconjugate) changes in the two eyes such that control values of saccadic magnitude and VOR gain were eventually reestablished in both eyes. (ox.ac.uk)

Clinical researchers use eye tracking to explore biomarkers for cognitive impairment, enabling new tools for diagnosis, rehabilitation, and treatment. (tobii.com)

2001)⁠. Whisking is coordinated with head and body movements, which enables rapid sampling of the proximal environment during spatial exploration. (scholarpedia.org)

However, learning to use a robotic arm and saccade adaptation, which use error-based learning, are facilitated by motivation, which is a function of the basal ganglia. (eneuro.org)
Here, we examined whether the output of the basal ganglia actually influences error-based learning by using saccadic eye movements. (eneuro.org)

Adaptation and mislocalization fields for saccadic outward adaptation in humans,Journal of Eye Movement Research, 4 (3), 1-18. (pisavisionlab.org)

Central and peripheral correlates of eye movements in selected mood disorders. (nel.edu)

We assessed eye movements during the K-D test to identify characteristics associated with slowed times. (elsevierpure.com)

Here, we show that nigral inactivation affected saccade adaptation. (eneuro.org)
Accuracy of saccadic eye movements is maintained thanks to adaptation mechanisms. (ox.ac.uk)
Although in daily-life we mostly perform sequences of saccades, the effect of saccadic adaptation has been mainly evaluated on single saccades. (ox.ac.uk)
Within this adaptation field visualstimuli presented before an adapted saccade are mislocalized in proportion to thechange of the saccade metric. (pisavisionlab.org)
We investigated the saccadic adaptation field andassociated localization changes for saccade lengthening, or outward adaptation. (pisavisionlab.org)

There is a strong connection between deficits in eye movements and various underlying brain disorders and injuries. (tobii.com)
This study focuses on eye movement disorders, in particular nystagmus, and the possibility of using eye tracking as an established form of diagnosis tool. (tobii.com)
Saccades are one of the most useful types of eye movements in the evaluation of the movement disorders patient. (hmto-hnas.com)
The goal is to provide a practical guide to bedside evaluation of saccades in the context of the movement disorders patient. (hmto-hnas.com)

Using electrical stimulation to evoke saccades from the dorsomedial frontal cortex (DMFC) and frontal eye fields (FEF) of rhesus monkeys, parametric tests were conducted to compare the excitability properties of these regions. (duke.edu)

Wemeasured localization judgements by asking subjects to localize a probe flashedbefore saccade onset. (pisavisionlab.org)

What are different types of eye movements? (pursuantmedia.com)

Saccades were also re-referenced to the PRL, but at a slower rate. (visionsciences.org)
PDs were slower to learn the first cue-saccade association presented, but did not show increased error or reaction time switch costs when switching between two rules within blocks. (lincoln.ac.uk)

The findings are consistent with a role for the nigrostriatal dopamine system in the reinforcement of saccade-response-outcome associations. (lincoln.ac.uk)

Convergence is movement of both eyes nasally, and divergence is movement of both eyes temporally. (medscape.com)
Accommodative convergence is convergence of the eyes stimulated by accommodating or focusing on a near target. (medscape.com)
Convergence insufficiency can lead to reading difficulties including seeing double, getting fatigued quickly, feeling like your eyes are not working together, and headaches. (familyeyecarecentre.com)

We show that in the mixing saccade task, the TS group make significantly fewer errors than an age-matched control group, while responding equally fast. (nottingham.ac.uk)
The results of the PD patients point to an intentional saccade impairment that does not correlate with the overall impairment in the attentional control. (uni-muenchen.de)
When vertical eye control is compromised, the body stiffens to prevent too much bobbing. (todaysgeriatricmedicine.com)
We found that inhibitory control was more impaired in the social condition, suggesting that actions initiated and stopped by social cues conveyed by the eyes are more difficult to withhold. (uniroma1.it)
Previous work in patients with focal lesions has shown that the control of saccadic eye movements in such contexts relies on a network of areas in the frontal cerebral cortex. (lincoln.ac.uk)

Under such conditions, there is a systematic misperception of the probes toward the saccade end point. (jneurosci.org)

The mechanisms underlying this perceptual stability can be probed in the laboratory by briefly presenting a stimulus around the time of a saccadic eye movement and asking subjects to report its position. (jneurosci.org)

The other involved shifting, unpredictably, between executing pro- and anti-saccades (mixed saccade task). (nottingham.ac.uk)
Separate, causal roles of the caudate in saccadic choice and execution in a perceptual decision task. (nature.com)

The Quiet Eye in Action: Perception, Cognition and Decision Training. (doncurrie.com)
This limited angle requires the eye to continuously move and "paint" a larger, sharper, field of view in our perception by integration of smaller 1.2 degree-angle FOVs. (astropix.com)

This can cause impairment of vertical gaze, allowing only one eye to move vertically. (wikipedia.org)

When retested later, one patient had adopted a more efficient strategy employing one large saccade calculated to overshoot the target. (nih.gov)
For example, it supports the idea that a saccade target must be attended prior to the saccade. (ubc.ca)
Saccades are very fast eye movements that allow the eyes to quickly move from one target or image to another. (uconn.edu)

The aim of the thesis is to provide evidence of the relevance of generative models in a more naturalistic viewing paradigm (i.e. across saccades). (gla.ac.uk)
Goal-oriented human saccades were recorded under double-step paradigm. (longdom.org)

The EyeLink 1000 is a powerhouse that sports a 1000 Hz sampling rate and a high accuracy and precision, arguably the best video-based eye tracker out there. (pygaze.org)
The RED-m is a portable eye tracker manufactured by SensoMotoric Instruments, with a slightly higher sampling rate (120 Hz) and comparable accuracy and precision to the EyeTribe. (pygaze.org)
The amount of systematic error is referred to as the accuracy of an eye tracker. (pygaze.org)

We conclude that the movement signal makes a difference in the duration of saccadic suppression," Saad Idrees and Matthias Baumann explain. (bernstein-network.de)

In a second condition, participants were asked to inhibit a saccade, that was previously instructed by a change in colour of one of the two same targets, when a change of color of a central picture occurred (non-social condition). (uniroma1.it)
My first idea was to create a setup in which participants' eye movements were recorded simultaneously by three trackers: the EyeLink 1000, the SMI RED-m, and the EyeTribe. (pygaze.org)
Average inter-saccadic intervals (ISI) were significantly longer in MS participants compared to controls (362 ± 103 vs. 286 ± 50 ms, P = 0.001), and were highly associated with prolonged K-D times in MS (P = 0.006). (elsevierpure.com)
MS participants generated greater numbers of saccades (P = 0.007). (elsevierpure.com)

Researchers from Tübingen show for the first time that the milliseconds- long blindness that occurs during rapid movements of the eyes, which allows flicker-free vision, comes from the retina. (bernstein-network.de)
Saccade is the term used to describe rapid movements of the eyes. (bernstein-network.de)

It has been shown in healthy individuals that saccadic eye movements can decrease body sway as result. (researchgate.net)

Intriguingly, the time course of saccade-related activity in CIP aligned with the temporally integrated V3A output. (elifesciences.org)

Since the lateral rectus controls movement away from the center of the body, a lesion in the abducens nucleus disrupts the pathways controlling outward movements, not allowing the right eye to move right and the left eye to move left. (wikipedia.org)

The primary deviation is misalignment, with the normal eye fixating. (medscape.com)
If the paretic eye fixates, the ensuing secondary deviation is typically larger than the primary deviation. (medscape.com)

Anatomy38

Organisms7

Diseases29

Chemicals and Drugs5

Analytical, Diagnostic and Therapeutic Techniques and Equipment24

Psychiatry and Psychology58

Phenomena and Processes51

Disciplines and Occupations1

Information Science8

Health Care4

Oculomotor10

Neurons7

Fixation11

Signals13

Volitional4

Ocular11

Different saccade1

Horizontal13

Micro-saccades1

Vertical saccades1

Voluntary saccades3

Abnormalities4

Stimuli6

Cerebellar4

Reflexive2

Superior colliculus1

Receptive fields2

Fovea2

Shift2

Visually guided2

Hypometria2

Experiment4

Neural1

Smooth pursuit2

Rightward3

Conjugate6

Responses1

Visual25

Vergence2

Deficit1

Metrics2

Latency3

Behavioral2

Sensorimotor1

Amplitude3

Optokinetic1

Magnitude2

Cognitive1

Spatial1

Basal2

Journal of Eye Movement Research1

Correlates1

Characteristics1

Adaptation5

Disorders4

Monkeys1

Onset1

Types of eye movements1

Slower2

Consistent1

Convergence3

Control5

Probes1

Stimulus1

Task2

Perception2

Impairment1

Target3

Paradigm2

Accuracy3

Duration1

Participants4

Rapid2

Decrease1

Temporally1

Outward1

Deviation2