Subjects horizontal saccades. Medical search. Frequent questions

Such eye movements are called catch-up saccades and are more common when pursuing at high speeds. (wikipedia.org)
In a natural environment, saccade and vergence eye movements shift gaze in different directions and distances. (njit.edu)
The recruitment of saccades may be utilized because of the longer period of diplopia resulting from slower vergence movements. (njit.edu)
To demonstrate this, close one eye, place a fingertip on top of that eyelid, and then slowly scan a straight horizontal line with your other eye-you will feel distinct and separate movements and periods of fixation. (huffpost.com)
Blinks executed during eye movements affect kinetic eye movement parameters, e.g., peak velocity of saccades is decreased, their duration is increased, but their amplitude is not altered. (uni-luebeck.de)
Monocular eye and lid movements were recorded in nine healthy subjects using the scleral search-coil system. (uni-luebeck.de)
Results: Patients showed abnormally hypermetric and fast horizontal saccades to the left and greater inaccuracy than healthy subjects in all saccadic eye movements. (unisi.it)
Eye movement abnormalities included slow eye movements that preceded the initial saccade. (unisi.it)
Conclusion: Slow eye movements accompanying saccades, SI, and cerebellar nystagmus are frequently seen in AT patients, additionally our ATLD patients showed the presence of fast and hypermetric saccades suggesting damage of granule cell-parallel fiber-Purkinje cell synapses of the cerebellar vermis. (unisi.it)
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)
Most studies on blink-induced eye movements have been restricted to rotations about the horizontal and vertical axes. (arvojournals.org)
In five healthy human subjects, eye movements about all principal axes of rotation (horizontal, vertical, and torsional) were recorded during voluntary blinks of different durations (as short as possible, 0.83 seconds, and 1.67 seconds) in straight-ahead gaze. (arvojournals.org)
3 measured horizontal and vertical eye movements during blinks at different gaze positions within 10° from straight-ahead gaze. (arvojournals.org)
To investigate the three-dimensional ocular kinematics during the initial phase of blinks, we recorded eye movements in healthy human subjects with dual search coils that were modified to exclude torsional artifacts. (arvojournals.org)
spatial resolution = 0.1 deg and temporal resolution = 60 Hz) was used to non-invasively measure horizontal and vertical eye movements in our patient. (biomedcentral.com)
We here demonstrate that human subjects faithfully track a sound's unpredictable movements in the horizontal plane with smooth-pursuit responses of the head. (eneuro.org)
Saccades are conjugat-ed eye movements coordinated by the visual process and are most frequently affected by neurological events [7]. (padulainstitute.com)
Saccades are one of the most useful types of eye movements in the evaluation of the movement disorders patient. (hmto-hnas.com)
Aberrant abilities to stabilize the eyes associated with pathological saccades, pursuits and vestibular eye movements may be evaluated at the bedside. (carrickinstitute.com)
Patients with type 3 disease, in addition to organomegaly and bony involvement, present with neurologic involvement, most often including slowing of the horizontal saccadic eye movements. (medscape.com)
Study even the smallest eye movements like saccade velocities and fixation duration with research-grade accuracy and precision. (varjo.com)
Therefore, the saccade-compensating methodology enables researchers and healthcare professionals to rule out eye movements as a source of inaccuracies in pre-, post-, and follow-up assessments. (bmj.com)

The pursuit of targets moving with velocities of greater than 30°/s tends to require catch-up saccades. (wikipedia.org)
Smooth pursuit is asymmetric: most humans and primates tend to be better at horizontal than vertical smooth pursuit, as defined by their ability to pursue smoothly without making catch-up saccades. (wikipedia.org)
2005), eye tracking in 6- to 12 moth old infants was found to be functional through catch-up saccades and thus could be extended to a nonlinear motion. (openedition.org)

Methods: Saccade dynamics, metrics, and visual fixation deficits were investigated in two Italian adult siblings with genetically confirmed ATLD. (unisi.it)
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)

Pathological vHIT findings (low vestibulo-ocular reflex gain and re-fixation saccade), which mainly affected the posterior SCC, were more common in the s-BPPV group than in the i-BPPV group (41.9 and 0%, respectively). (frontiersin.org)
Each of these saccades ends with a fixation, or a temporary snapshot of the text within you focus area (approx. (huffpost.com)
Each fixation will last one-fourth to one-half seconds in the untrained subject. (huffpost.com)
The untrained subject engages in regression (conscious rereading) and back-skipping (subconscious rereading via misplacement of fixation) for up to 30 percent of total reading time. (huffpost.com)
You must use conditioning drills to increase horizontal peripheral vision span and the number of words registered per fixation. (huffpost.com)
Untrained subjects use central focus but not horizontal peripheral vision span during reading, foregoing up to 50 percent of their words per fixation (the number of words that can be perceived and "read" in each fixation). (huffpost.com)
In order to address this question we tested blinks elicited before the target onset of saccades and pursuit and compared the results to the gap effect: if a fixation light is extinguished for several hundred milliseconds, the reaction time (latency) for subsequent saccades or smooth pursuit eye movements is decreased. (uni-luebeck.de)
In one-third of the trials (smooth pursuit or saccades) the fixation light was extinguished for 200 ms before stimulus onset (gap condition), and in another third of the trials reflexive blinks were elicited by a short airpuff before the stimulus onset (blink condition). (uni-luebeck.de)

Quantitative characterization of saccade parameters, saccadic intrusions (SI), and nystagmus was performed. (unisi.it)
Horizontal and vertical spontaneous jerk nystagmus, gaze-evoked, and rebound nystagmus were evident. (unisi.it)
Spontaneous horizontal nystagmus was observed toward the left side at first and changed toward the right side on the fifth hospital day. (ejao.org)

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)
An understanding of gaze promotes the development of both saccades and pursuits that allow individuals to participate in their activities of daily life. (carrickinstitute.com)
Key structures involved in horizontal and vertical gaze allow the clinician to physiologically test specific areas of the integrated nervous system with direction towards clinical applications. (carrickinstitute.com)

Hence, the purpose of this study is to assess whether the frequency of saccades within vergence responses are correlated with vergence peak velocity. (njit.edu)
When the vergence peak velocity was slow, a greater number of saccades was observed. (njit.edu)
An increased prevalence of saccades was observed in vergence responses with reduced peak velocity, compared to responses with greater peak velocity. (njit.edu)
Prior research supports that saccades increase the peak velocity of vergence during combined vergence and saccadic tasks. (njit.edu)
Saccade amplitude, peak velocity, and duration were not different in the three conditions. (uni-luebeck.de)
The horizontal amplitude/velocity relationship of CRN aligned with the main sequence of vergence responses of normal control subjects but not with that of saccades. (uni-luebeck.de)
Visual feedback provides the positional error and retinal slip velocity, needed to realign the fovea with the target through corrective saccades and smooth pursuit. (eneuro.org)

Saccade test, pursuit test and optokinetic test presented normal ranges, but caloric test showed the left canal paresis of 21% on the third hospital day and 73% on the eighth hospital day. (ejao.org)

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

A saccade detecting algorithm was utilized to compute the percentage of saccades present within all vergence responses. (njit.edu)
This may in part explain the increased presence of saccades within vergence responses with reduced peak velocities. (njit.edu)

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)

There was also no difference in blink amplitude and duration of pupil occlusion in the blink condition, neither in saccades nor in smooth pursuit. (uni-luebeck.de)
Saccade amplitude transition function (ATF) and response latency indicated the saccade programming mechanism. (longdom.org)

Horizontal step-ramp smooth pursuit of 20 deg/s was elicited in one session, or 5 deg horizontal visually guided saccades in another experimental session. (uni-luebeck.de)
Stimulus direction and the three conditions were randomized for saccades and smooth pursuit separately. (uni-luebeck.de)
The latency reduction of smooth pursuit, but not of saccades, may neither be explained by the brief pupil occlusion nor by visual suppression, warning signals, or the startle response. (uni-luebeck.de)
Eye tracking does not reach adult maturity until mid-adolescence, with a developmental asymmetry in that horizontal smooth pursuit develops earlier than vertical smooth pursuit (Salman, Sharpe, Lillakas, Dennis, & Steinbach, 2006). (openedition.org)

During oculomotor experiments, it is often important to ensure that no saccades occurred when the subject was supposed to be smoothly pursuing a target. (wikipedia.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)

These saccades may facilitate the response when the kinematics of the vergence component are modest as indicated by reduced velocities. (njit.edu)
The average vergence peak velocities were inversely correlated to the number of saccades observed within the transient portion defined as after the latency to 400. (njit.edu)

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)
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)

Traditionally, the caloric test evaluates the vestibulo-ocular reflex (VOR) function of the horizontal SCC using non-physiological stimulus within the frequency range of 0.002-0.004 Hz ( 8 ). (frontiersin.org)
however, saccades occur during the vergence movement even though the stimulus should not stimulate a saccadic response. (njit.edu)

Laser stimuli were front-projected onto a tangent screen in front of the subjects. (uni-luebeck.de)

Abnormally increased intertrial variability was observed for many vergence parameters (gain, duration, and speed) for the subjects with vergence disorders. (arvojournals.org)
Parameter estimations were calculated using the system identification technique for saccade parameters and neural inputs. (longdom.org)

Visually guided saccades were compared with those of 40 healthy subjects. (unisi.it)

Here, we tracked FEF spatial codes through time using a novel analytic method applied to the classic memory-delay saccade task. (eneuro.org)
The present study now aims to compare vertical and horizontal spatial associations in mental arithmetic. (researchgate.net)
The analysis of the problem solving performances revealed a motion-arithmetic compatibility effect for spatial actions along both the horizontal and vertical axes. (researchgate.net)

VN, another typical variant of acute vestibular syndrome, shows mainly vestibular impairment in the horizontal and anterior SCC (as in superior VN). (frontiersin.org)

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

In contrast, the latency of the saccades in the gap condition was decreased by 39 ms, but not in the blink condition. (uni-luebeck.de)

We here demonstrate accurate head-pursuit of sounds, moving along unpredictable trajectories in the horizontal plane. (eneuro.org)

Researchers are able to discard portions of eye movement recordings that contain saccades, in order to analyze the two components separately. (wikipedia.org)
The sample dataset contains 6 minutes of recordings at 1200Hz for one subject and includes 100 stimulations of each arm. (usc.edu)

CRN had disconjugate horizontal and torsional components. (uni-luebeck.de)

2 described the horizontal and vertical trajectories of the human eye during the entire period of voluntary and reflexive blinks. (arvojournals.org)

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)

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)
The goal is to provide a practical guide to bedside evaluation of saccades in the context of the movement disorders patient. (hmto-hnas.com)

The anatomy of the subject is ready. (usc.edu)

An eye movement shifts the orientation of the coil to induce an electric current, which is translated into horizontal and vertical eye position. (wikipedia.org)

Select the "Functional data (sorted by subject)" exploration mode (second button in the toolbar above the database explorer). (usc.edu)

This perisaccadic compression of visual space has been the subject of much research, but few studies have attempted to relate it to specific brain mechanisms. (jneurosci.org)
Automatic IPD, ultra-wide, custom-made aspheric lenses, and the highest resolution displays available make everything instantly sharper and smoother - reducing eye strain and simulator sickness for your research subjects. (varjo.com)
This finding is in line with previous research on one-dimensional horizontal head tracking in infants. (openedition.org)

Goal-oriented human saccades were recorded under double-step paradigm. (longdom.org)

If you do not have access to an individual MR scan of the subject (or if its quality is too low to be processed with FreeSurfer), but if you have digitized the head shape of the subject using a tracking system, you have an alternative: deform one of the Brainstorm templates (Colin27 or ICBM152) to match the shape of the subject's head. (usc.edu)

However, auditory scenes typically contain moving sounds, and subjects may move actively or passively through the environment. (eneuro.org)

The incidence of horizontal SCC involvement was also higher in the s-BPPV group (45.16 and 16.67%, respectively). (frontiersin.org)

Subjects with JBD may be asymptomatic or have variable symptoms based on its location and size. (ejao.org)

The study described here expanded our previous work and further supported the muscle model as well as the theory of the time-optimal saccade controller under physiological constraints. (longdom.org)

Stereoscopic depth cues provide information about distances of objects in near space as a function of their relative horizontal positions in the visual field. (britannica.com)

Gain deep, reliable and immediate insights into what your subjects see and experience at a level never seen before. (varjo.com)

Since the dark trough and light rise occurs around 8 minutes after a change in light adaption a subject is required to make reproducible saccades for 10-15 minutes in the dark followed by 10-15 minutes in the light. (wspos.org)

The frontal eye fields (FEFs) participate in both working memory and sensorimotor transformations for saccades, but their role in integrating these functions through time remains unclear. (eneuro.org)

Anatomy14

Organisms2

Diseases6

Chemicals and Drugs2

Analytical, Diagnostic and Therapeutic Techniques and Equipment5

Psychiatry and Psychology18

Phenomena and Processes23

Information Science2

Movements22

Catch-up saccades3

Metrics3

Fixation8

Nystagmus3

Gaze3

Velocity7

Optokinetic1

Onset1

Responses2

Amplitudes1

Amplitude2

Smooth pursuit4

Oculomotor2

Velocities2

Saccadic eye2

Stimulus2

Stimuli1

Parameters2

Visually1

Spatial3

Vestibular1

Probes2

Latency1

Pursuit1

Recordings2

Torsional1

Trajectories1

Target1

Disorders2

Anatomy1

Movement1

Functional1

Research3

Human1

Scan1

Auditory1

Involvement1

Symptoms1

Model1

Provide1

Gain1

Light1

Time1