Saccade paradigm saccadic saccades. Medical search. Frequent questions

Because the display updates in response to the observer's eye movements, the gaze-contingency paradigm can be classified an interactive eye-tracking application. (wikipedia.org)
The study of eye movements in reading allowed researchers to map out the perceptual span (moving window paradigm), the nature of the extrafoveal information extracted during a fixation, for instance orthographic and phonological information (boundary paradigm) or the relative influence of attention versus visual acuity drop-off in the perceptual span (parafoveal magnification paradigm). (wikipedia.org)
Due to the nature of vision, we rapidly sample our visual environment using ballistic eye-movements called saccades. (gla.ac.uk)
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)
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)
Thus, accurate tracking requires a synergistic coordination of saccades and smooth pursuit eye movements to overcome retinal position and velocity mismatches, respectively. (eneuro.org)
Saccades are the step-like movements that we most often employ for this purpose. (cuny.edu)
Comparison of similar -sized movements during the two test paradigms indicated that whereas INO patients could decrease peak velocity of their abducting eye during the Müller paradigm, they were unable to modulate adducting velocity in response to viewing conditions. (bvsalud.org)
In the achieve, they in addition needed to come up with a saccadic eyesight movements into a prominent graphic cue shown in locations other than the objective. (epirubicininhibitor.com)
Saccadic eye movements rapidly displace the image of the world that is projected onto the retinas. (duke.edu)
Recent studies of sensorimotor processing have benefited from decision-making paradigms that emphasize the selection of appropriate movements. (duke.edu)
Therefore, athletes and controls seem to use the same visual strategies (saccadic movements) when analysing the opponent's posture before acting. (unimib.it)
Execution of saccadic eye movements affects speed perception. (psychauthors.de)
Because eye movements are essentially motor movements, it takes time to plan and execute a saccade. (scholarpedia.org)
Aberrant abilities to stabilize the eyes associated with pathological saccades, pursuits and vestibular eye movements may be evaluated at the bedside. (carrickinstitute.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)
Rapid shifts of the point of visual fixation between equidistant targets require equal-sized saccades of each eye . (bvsalud.org)
Release reaction times (i.e., time between the start of the first saccade away from the fixation rectangle toward the response box) were faster toward the arm that seemed about to attack for the jab stance (the most dynamic one as implying motion) when judging the glove colour in both athletes and controls. (unimib.it)
During the actual eye movement (or saccade ), vision is suppressed and new information is acquired only during the fixation (the period of time when the eyes remain relatively still). (scholarpedia.org)
From this table, it is immediately apparent that while the values presented in the table are quite representative of the different tasks, they show a range of average fixation durations and for each of the tasks there is considerable variability both in terms of fixation durations and saccade lengths. (scholarpedia.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)
For humans, visual tracking of moving stimuli often triggers catch-up saccades during smooth pursuit. (eneuro.org)
While conventionally, saccade experiments are performed using very small stimuli, we see that using larger stimuli can greatly change saccade performance. (cuny.edu)
Briefly presented stimuli occurring just before or during a saccadic eye movement are mislocalized, leading to a compression of visual space toward the target of the saccade. (pisavisionlab.org)

This velocity thresholding technique is used to prevent the observer from noticing the changes made to the display, because saccadic suppression blocks visual processing during saccades. (wikipedia.org)
Age effects on saccadic suppression of luminance and color. (psychauthors.de)
A bias in saccadic suppression of shape change. (psychauthors.de)
Stronger saccadic suppression of displacement and blanking effect in children. (psychauthors.de)
Visual input signaling threat gains preferential access to awareness in a breaking continuous flash suppression paradigm. (belopolsky.nl)

In a related technique, the display can be updated when the gaze moves at a speed higher than a specified velocity threshold, ensuring that the display updates during a saccade. (wikipedia.org)
We estimated the saccadic component of each movement by measuring peak velocity and peak acceleration . (bvsalud.org)
For saccades made by control subjects between equidistant targets, the group mean ratio (±SD) of adducting/abducting peak velocity was 0.96 ± 0.07 and adducting/abducting peak acceleration was 0.94 ± 0.09. (bvsalud.org)
Corresponding ratios for INO cases were 0.45 ± 0.10 for peak velocity and 0.27 ± 0.11 for peak acceleration , reflecting reduced saccadic pulses for adduction. (bvsalud.org)
For control subjects, during the Müller paradigm, the adducting/abducting ratio was 1.25 ± 0.14 for peak velocity and 1.03 ± 0.12 for peak acceleration . (bvsalud.org)
When adducting/abducting ratios during Müller versus equidistant targets paradigms were compared, INO cases showed larger relative increases for both peak velocity and peak acceleration compared with control subjects. (bvsalud.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)

However, the initial component of each eye 's movement was similar in both cases, possibly reflecting activation of saccadic burst neurons . (bvsalud.org)
In anticipation of each saccade, many neurons in the visual system shift their receptive fields. (duke.edu)

The Tobii Eye-tracker, shown in Figure 1, is an instrument that is capable of capturing data about both saccadic activity and fixations of the foveal area. (uxmatters.com)
Forced fixations, trans-saccadic integration, and word recognition: Evidence for a hybrid mechanism of saccade triggering in reading. (google.ch)

Within computer technology, the gaze-contingency paradigm is a general term for techniques allowing a computer screen display to change in function depending on where the viewer is looking. (wikipedia.org)

We use a novel paradigm in which the intrasaccadic steps change from trial-to-trial so that over many trials the displacement produces a sine wave pattern. (cuny.edu)
Compensatory saccades made to remembered targets following orbital displacement by electrically stimulating the dorsomedial frontal cortex or frontal eye fields of primates. (duke.edu)
Detection of object displacement during a saccade is prioritized by the oculomotor system. (belopolsky.nl)

Instead of intra-saccadically moving the target in order to induce saccade adaptation, we present a distractor briefly after the saccade on the near side or far side of the target. (cuny.edu)
By drawing attention away from the saccade target immediately after the saccade, the distractor is able to induce saccade adaptation. (cuny.edu)
The magnitude of the saccade adaptation depends on the novelty of the distractor. (cuny.edu)
Target-distractor competition cannot be resolved across a saccade. (belopolsky.nl)
Distractor displacements during saccades are reflected in the time-course of saccade curvature. (belopolsky.nl)

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)
In the double task, also cerebellar patients showed an intentional saccade impairment that correlates with the deficit in the attentional control. (uni-muenchen.de)
We recorded saccades as indexes of visual attentional orienting during an implicit paradigm (i.e., a Simon-like task): nine experienced boxers and nine controls observed photographs of boxing attacks (jab and cross) or a neutral position (guard) and judged the colour of body parts either salient or not for elaborating the attack action (gloves vs. shorts, respectively) by shifting their gaze towards one of two lateral response boxes. (unimib.it)

Transsaccadic integration benefits are not limited to the saccade target. (psychauthors.de)
Spatiotopic and saccade-specific transsaccadic memory for object detail. (belopolsky.nl)

Saccade amplitude transition function (ATF) and response latency indicated the saccade programming mechanism. (longdom.org)
Improved reward for top Steroid biology achieve accuracy decreased the probability of quickly saccades but remaining their latency unchanged. (epirubicininhibitor.com)
Many of us right here show just how much stare anchoring is actually flexibly modulated with the prize contingencies of saccade latency and also reach exactness. (epirubicininhibitor.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)

Saccades maintain their accuracy through an adaptive process, slowly to compensate for muscle weakening, or rapidly in a lab setting using intra-saccadic steps. (cuny.edu)
The submission in the saccade RTs revealed 2 kinds of vision actions rapidly saccades along with short RTs, as well as non-reflex saccade using lengthier RTs. (epirubicininhibitor.com)

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)

In most cases this has been measured in subjects over-trained to perform a stereotyped and unnatural task where saccades are repeatedly driven to the same location, marked by a highly salient abrupt onset. (pisavisionlab.org)
We addressed this question by studying perisaccadic localization in a set of participants with no prior experience in eye-movement research, measuring localization performance as they practiced the saccade task. (pisavisionlab.org)
These results indicate that perisaccadic compression is a robust behavior, insensitive to the specific paradigm used to drive saccades and to the level of practice with the saccade task. (pisavisionlab.org)

Rapid spatial oculomotor updating across saccades is malleable. (belopolsky.nl)
Rapid updating of spatial working memory across saccades. (belopolsky.nl)
The role of the oculomotor system in updating visual-spatial working memory across saccades, PloS one,11, e0161829. (belopolsky.nl)

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)
Parameter estimations were calculated using the system identification technique for saccade parameters and neural inputs. (longdom.org)
Likewise, saccades and their properties were thought to be strictly governed by position inputs ( Wurtz and Optican, 1994 ). (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)

The role of the medial longitudinal fasciculus in horizontal gaze: tests of current hypotheses for saccade-vergence interactions. (bvsalud.org)
The brainstem medial longitudinal fasciculus (MLF) plays a cardinal role in ensuring that horizontal saccades between equidistant targets are tightly yoked. (bvsalud.org)
Lesions of the MLF--internuclear ophthalmoparesis (INO)--cause horizontal saccades to become disjunctive adducting saccades are slow, small, or absent. (bvsalud.org)
We studied horizontal gaze shifts between equidistant targets and between far and near targets aligned on the visual axis of one eye (Müller test paradigm) in five cases of INO and five control subjects. (bvsalud.org)
These findings support the hypothesis that horizontal saccades are governed by disjunctive signals, preceded by an initial, high- acceleration conjugate transient and followed by a slower vergence component. (bvsalud.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)
Interaction of dynamic error signals in saccade adaptation. (psychauthors.de)

The second study of this thesis looks at how the scale of attention can affect the magnitude of saccade adaptation. (cuny.edu)
Finally, we demonstrate that the locus of attention at the end of a saccade contributes to the error signal for saccade adaptation. (cuny.edu)
Using novel paradigms, we show that the locus of attention can induce saccade adaptation, and that the scale of attention influences both the magnitude of saccade adaptation as well as the decision to move. (cuny.edu)
Rapid visual adaptation persists across saccades. (psychauthors.de)
Competition between salience and informational value for saccade adaptation. (psychauthors.de)

in our data, this resulted in longer saccade trigger times and more smooth trials without saccades. (eneuro.org)
We are able to infer the attention scale during individual trials from their saccade latencies. (cuny.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)
Evidence for the transfer of spatiotemporally predictive feedback across saccade was supported by the fMRI study presented in Chapter 3. (gla.ac.uk)

Our results add support for a common and shared sensorimotor process for saccades and pursuit. (eneuro.org)

The remainder of the thesis concentrates on the effects of attention scale and locus on post-saccade adaptive processes: how the success of the current plan influences learning. (cuny.edu)

Most work on active vision or attention and saccades has concentrated on performance improvements preceding saccades, but relatively little is yet known about how attention affects later stages of saccade planning. (cuny.edu)

The technical principle of the paradigm involves a computer interfaced with both an eye-movement tracking system (eye-tracker) and a display of the visual stimulus. (wikipedia.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)
saccade -A saccade is the fastest movement of which the human body is capable-taking only about 30 milliseconds-and centers content within the foveal area. (uxmatters.com)

The gaze-contingent technique is the basis of various experimental paradigms, each of them allowing to investigate specific cognitive processes. (wikipedia.org)
The function of inhibition, attention and other cognitive activities can be studied through psychophysiological paradigms (Park et al. (bvsalud.org)

In the boundary paradigm, an extrafoveal prime (a homophone in reading for example) is replaced by the target stimulus when the eyes cross an invisible boundary around the target area. (wikipedia.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)
When significant position error (PE) is accumulated, a catch-up saccade may be triggered to re-foveate the target. (eneuro.org)
The mislocalization also remained similar when the expert observers were tested in a condition leading to less stereotypical saccadic behavior-with no abrupt onset marking the saccade target location. (pisavisionlab.org)

As a consequence, the properties of saccades and smooth pursuit were studied independently. (eneuro.org)
Many of us inflated the work requirements by independently transforming reward contingencies regarding saccade response occasion (RT) and attaining accuracy and reliability. (epirubicininhibitor.com)

In summary, our data supports our hypothesized predicted error-based decision process for coordinating saccades during smooth pursuit. (eneuro.org)
On average, the two saccade RTs and reach error diverse systematically using incentive condition, with attain precision enhancing once the saccade has been delayed. (epirubicininhibitor.com)

Casana-Perez, Susana Maria (2004): Control of attention before reflexive and intentional saccades. (uni-muenchen.de)
First we look at the temporal dynamics of the scaling of attention and what influence that attention scale exerts on the decision to make a saccade. (cuny.edu)
These experiments highlight the interplay between attention and saccades. (cuny.edu)
Khan, Afsheen, "The Interplay of Visual Attention and Saccade Planning in Active Vision" (2014). (cuny.edu)

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)

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

The internal model of motion was created prior to saccade and tested at a post-saccadic retinotopic region of V1. (gla.ac.uk)
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)

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)

The moving mask paradigm is a reverse technique in comparison with the moving window paradigm. (wikipedia.org)

Anatomy27

Organisms7

Diseases12

Chemicals and Drugs2

Analytical, Diagnostic and Therapeutic Techniques and Equipment19

Psychiatry and Psychology45

Phenomena and Processes33

Disciplines and Occupations2

Information Science6

Health Care3

Movements15

Fixation6

Stimuli4

Suppression5

Velocity7

Neurons2

Fixations2

Gaze-continge1

Displacement3

Distractor5

Attentional3

Transsaccadic2

Latency3

Variability1

Rapidly2

Mechanism1

Task3

Spatial3

Inputs4

Horizontal5

Signals4

Adaptation5

Trials2

Evidence2

Sensorimotor1

Thesis1

Affects1

Movement3

Cognitive2

Target4

Independently2

Error2

Attention4

Effects1

Human1

Model2

Time1

Technique1