Saccades and smooth pursuits. Medical search. Frequent questions

The switch between these continuous and discrete eye movements is a trade-off between tolerating sustained position error (PE) when no saccade is triggered or a transient loss of vision during the saccade due to saccadic suppression. (eneuro.org)
Foveal tracking of moving objects in the environment is accomplished by smooth pursuit eye movements. (eneuro.org)
Thus, accurate tracking requires a synergistic coordination of saccades and smooth pursuit eye movements to overcome retinal position and velocity mismatches, respectively. (eneuro.org)
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)
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)
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)
There are four basic types of eye movements: saccades, smooth pursuit movements, vergence movements, and vestibulo-ocular movements. (pursuantmedia.com)
Measure the brain's ability to execute or suppress reflexive eye movements with saccade and anti-saccade tests. (tobii.com)
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)
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)
The final paper in this issue by Vinuela-Navarro outlines the importance of appropriate eye movement control in children , and describes the typical characteristics of fixational, saccadic and smooth pursuit eye movements, and their development during childhood. (college-optometrists.org)
Decisions about the timing of saccades become more critical, and decisions must also involve smooth eye movements, as well as saccades. (researchwithrutgers.com)
6%). Strategies reflected a combined contribution of saccades and smooth eye movements. (researchwithrutgers.com)
In addition, smooth eye movements, whose involvement during perceptual tasks within dynamic displays may have previously escaped notice, provide useful indictors of the strategies used to select information and distribute attention during the performance of dynamic perceptual tasks. (researchwithrutgers.com)
Smooth and accurate eye movements allow them to track words on a page, follow along during a teacher's instruction, and shift focus between different visual stimuli. (sunridgeeyeclinic.ca)
Smooth pursuit eye movements enable children to smoothly track moving objects, such as a ball or a moving car. (sunridgeeyeclinic.ca)
When creating a smooth pursuit task it is a good idea to include pursuit target position information so that target and eye movements can be compared at the analysis stage. (sr-research.com)
Smooth pursuit eye movements are slow and thus not picked up the EyeLink's saccade-picking algorithm but are identified as fixation events instead (see section 4 of your EyeLink's User Manual ). (sr-research.com)
5- Each row of the resulting tab-delimited "*_processed.txt" text file represents a separate "fixation" identified by the Eyelink parser (i.e. a section of smooth pursuit eye movements if the eyes followed smoothly the moving target). (sr-research.com)
If the input file used for the pursuitDV app contains binocular eye movements, the pursuitDV app will output separate pursuit measures for left and right eye i.e. there will be separate rows for EYE_USED = L and EYE_USED = R. The pursuitDV app can be used to analyse smooth pursuit to targets in any direction. (sr-research.com)
For people with ocular motor dysfunction, however, the eyes do not work together properly to contribute to smooth, fluid eye movements. (daviseyeassoc.net)
The doctor will also look for reduced accuracy of saccades (the quick back-and-forth eye movements), inability to follow objects in a particular sequence, and need to move the head or follow a finger to follow along on a page. (daviseyeassoc.net)
As visual intake is possible during smooth pursuit, the movement is relevant for tracking eye movements. (eyeware.tech)
Nystagmus consists of two movements of the eyeball: a smooth, slower movement opposite of the direction of the rotation (called smooth pursuit), and then a sudden jerk of the eye back towards the direction of the rotation (called saccades). (caribbeanmedstudent.com)

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)
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)
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)
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)
The attached pursuitDV app therefore uses gaze position samples within fixation events only, and compares them with the corresponding pursuit target position in order to generate some pursuit measures for each "fixation" event. (sr-research.com)

When significant position error (PE) is accumulated, a catch-up saccade may be triggered to re-foveate the target. (eneuro.org)

Your eyes will slow down the smooth pursuits and decrease the saccades, at least for the vestibulo-ocular nystagmus. (caribbeanmedstudent.com)
Because of this, you'll continue seeing nystagmus after I stop, except this time the smooth pursuit is towards the left and the saccade is toward the right (because of the perceived right rotation despite being stopped). (caribbeanmedstudent.com)

What are saccades and fixations? (pursuantmedia.com)
The paper also provides an introduction to the different eye movement characteristics found in children with learning difficulties, and describes and discusses the clinical techniques currently available to evaluate fixations, saccades and smooth pursuits in optometric practice. (college-optometrists.org)
Saccades are fast "jumps" that the eye performs between fixations in a static environment. (eyeware.tech)

Listing's law has been shown to hold when the head is stationary and upright and gaze is directed toward far targets, i.e., when the eyes are either fixating, making saccades, or pursuing moving visual targets. (wikipedia.org)
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)

Oculomotor integrity is evaluated with eye tracking during smooth pursuit, saccades, and optokinetic stimulation. (medscape.com)

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)

Many mechanics involved in NOP, such as visual field, saccades, smooth pursuit, and the vestibulo-ocular reflex (VOR), have direct and tangible implications in officiating. (ophthalmologytimes.com)
The video head impulse tests revealed preserved vestibulo-ocular reflex gain but with small catch-up saccades for right horizontal canal ( Fig. 1B ). (e-rvs.org)

Saccade amplitude, peak velocity, and duration were not different in the three conditions. (uni-luebeck.de)
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)
Velocity gain, proportion of smooth pursuit, and the number and amplitude of saccades during smooth pursuit were calculated for the remaining participants. (cardiff.ac.uk)
Corrective saccades increased significantly in amplitude and latency. (bvsalud.org)

Our results add support for a common and shared sensorimotor process for saccades and pursuit. (eneuro.org)
Consequently, our current understanding describes saccades and pursuit as two outcomes of a synergistic sensorimotor process, sharing sensory inputs, anatomic pathways, and functional regulation ( Orban de Xivry and Lefèvre, 2007 ). (eneuro.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)
0.05), for horizontal smooth pursuit. (cardiff.ac.uk)
Horizontal saccades and smooth pursuit were normal. (e-rvs.org)
Horizontal saccades and smooth pursuit were normal, while upward saccades were slightly hypermetric ( Fig. 2A ). (e-rvs.org)

The latency of the step-ramp smooth pursuit in the blink condition was found to be decreased by 10 ms, which was less than in the gap condition (38 ms). However, the initial acceleration and steady-state velocity of smooth pursuit did not differ in the three conditions. (uni-luebeck.de)
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)
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)
Saccade latency increased but statistically significantly only with right-sided cycles. (bvsalud.org)
Ethanol also decreases smooth eye pursuit gain and increases pro-saccade latency. (bvsalud.org)

Saccade reaction time asymmetries during task-switching in pursuit tracking. (mpg.de)

The loss of foveal vision means that these foveating saccades will be counterproductive. (visionsciences.org)

Like the head of a ballerina, the eyes eventually need to catch up with the rest of the body, so every period of smooth compensation is followed by a a rapid eye movement, which sets our eyes back into a more comfortable position. (cogsci.nl)

and (b) spontaneous smooth pursuit of the pair of discs occurred after the perceptual report, when the discs moved as a pair along a common path. (researchwithrutgers.com)

Informed by model predictions, we hypothesized that saccade trigger time length and variability will increase when pre-saccadic predicted errors are small or visual uncertainty is high (e.g., for blurred targets). (eneuro.org)

For humans, visual tracking of moving stimuli often triggers catch-up saccades during smooth pursuit. (eneuro.org)
This study aimed to characterize smooth pursuit in children using child-friendly stimuli and procedures. (cardiff.ac.uk)

in our data, this resulted in longer saccade trigger times and more smooth trials without saccades. (eneuro.org)

There was a statistically significant, symmetrical decrease in video-oculography smooth pursuit gain. (bvsalud.org)

Specifically, crew leaders were instructed in principles regarding visual field, saccades vs smooth pursuit, dynamic visual acuity, and the VOR. (ophthalmologytimes.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)

Smooth pursuits involve following a moving object accurately. (daviseyeassoc.net)

in fact, Listing's law requires that the rotation axis of most saccades lies outside of Listing's plane, more specifically, the rotation axis lies in Listing's plane only if the movement starts or ends at the primary position or if it is a prolongation of such a movement. (wikipedia.org)
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)
Express Saccades and Smooth Pursuit Eye Movement Function in Schizophrenic, Affective Disorder, and Normal Subjects. (bvsalud.org)
Smooth pursuit is the eye movement that takes place when looking at an object in motion and following it. (eyeware.tech)

The mechanism by which the brain decides when to trigger discrete catch-up saccades during continuous smooth pursuit has eluded researchers for decades. (eneuro.org)

demonstrated that catch-up saccades were less likely to occur when the target re-crosses the fovea within 40-180 ms. To date, there is no mechanistic explanation for how the trigger decision is made by the brain. (eneuro.org)

Measure a person's ability to fixate on a moving object using smooth-pursuit tasks. (tobii.com)
Purpose: It could be argued that current studies investigating smooth pursuit development in children do not provide an optimal measure of smooth pursuit characteristics, given that a significant number have failed to adjust their setup and procedures to the child population. (cardiff.ac.uk)

Stimulus direction and the three conditions were randomized for saccades and smooth pursuit separately. (uni-luebeck.de)

The sensory inputs of pursuit were thought to consist only of velocity and acceleration ( Krauzlis and Lisberger, 1994b ). (eneuro.org)

Video head impulse tests showed decreased gains with catch-up saccades for both posterior canals. (e-rvs.org)

Pursuit), as well as our Pursuit demos for other experiment-creation software such as Psychtoolbox/Matlab and Psychopy show how target information can be saved for later use by our Data Viewer software . (sr-research.com)
message whenever your experiment draws the pursuit target at a new target position on the screen (e.g. at each screen refresh). (sr-research.com)

Stopped clocks were mounted to the walls around the house to scoop the time from a woman's eyes or cut her saccade to smooth pursuit. (poetrylondon.co.uk)
The smooth tracking of a moving object with the eyes. (sunridgeeyeclinic.ca)
If you were to spin in a chair and not focus on any one particular object, your eyes will experience a whole series of these smooth pursuits and saccades. (caribbeanmedstudent.com)

Pursuit) while demos in other experiment-creation software have commented lines of code. (sr-research.com)

Saccade accuracy remained constant. (bvsalud.org)

For a long time, it was believed that saccades and smooth pursuit were controlled by independent functional and anatomic systems in the brain ( Robinson, 1986 ). (eneuro.org)

ANOVA was used to investigate the effect of age on smooth pursuit parameters. (cardiff.ac.uk)

Asymmetric saccade reaction times to smooth pursuit. (mpg.de)

Saccades shift the spotlight of attention. (pursuantmedia.com)

In summary, our data supports our hypothesized predicted error-based decision process for coordinating saccades during smooth pursuit. (eneuro.org)

As I rotate to my left, my smooth pursuit is towards the right and the saccade is toward the left. (caribbeanmedstudent.com)

Median and quartiles were calculated for each age group and pursuit condition. (cardiff.ac.uk)

Anatomy21

Organisms4

Diseases8

Chemicals and Drugs2

Analytical, Diagnostic and Therapeutic Techniques and Equipment12

Psychiatry and Psychology29

Phenomena and Processes28

Information Science1

Health Care1

Movements25

Fixation7

Catch-up saccade1

Nystagmus2

Fixations3

Gaze2

Optokinetic1

Oculomotor1

Vestibulo-ocular2

Amplitude4

Sensorimotor2

Horizontal4

Latency5

Reaction time1

Foveal1

Rapid1

Spontaneous1

Variability1

Stimuli2

Trials1

Decrease1

Visual2

Involve1

Movement4

Mechanism1

Occur1

Measure2

Stimulus1

Acceleration1

Head impulse1

Target2

Eyes3

Experiment1

Accuracy1

Time1

Parameters1

Times1

Attention1

Data1

Left1

Condition1