Model humans saccades. Medical search. Frequent questions

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)
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)
We found that precursor fixations were preceded by the largest saccades among the fixation categories. (lu.se)
Independent of the effect of saccade length, EEG amplitude was enhanced in precursor fixations compared with the other fixation categories 200 to 400 ms after fixation onsets, most noticeably over the occipital areas. (lu.se)
Algorithms for eye fixation and movement (i.e., saccades) will be developed and used to quantitatively explain complex relationships between fixation patterns and choice behaviour, as well as several fixation-driven decision biases. (fraunhofer.pt)
2. Hung G. Linear model of accommodation and vergence can account for discrepancies between AC/A measures using the fixation disparity and phoria methods. (reading.ac.uk)
Is human classification a gold standard in fixation detection? (lu.se)

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)
Reporting in The Journal of Clinical Investigation , Jeremy Nathans, Ph.D., Hugh Cahill, Ph.D., and Amir Rattner, Ph.D., state that changes in eye movements correctly indicated the therapeutic effect of antipsychotic drug treatment in a pharmacologic model of schizophrenia. (genengnews.com)
This is characterized by a series of slow eye-tracking movements, interrupted at regular intervals by rapid resetting movements (saccades) in the opposite direction. (genengnews.com)
Observations in a mouse model of schizophrenia further suggested that the suppression of phencyclidine-induced spontaneous eye movements could be used as a screening tool for antipsychotic drug candidates. (genengnews.com)
Separate studies in a mouse model of Huntington disease found that changes in spontaneous eye movements occurred at an age when animals with the disease were still too young to display any health-related symptoms or changes in rotarod performance. (genengnews.com)
Interestingly, the researchers suggest, spontaneous eye movements in the Huntington disease model may represent the murine correlate of the saccade errors observed in human Huntington disease patients, and "presumably be used to follow disease progression or responses to treatment in presymptomatic Huntington disease animal models. (genengnews.com)
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)
Humans perceives the world by directing the center of gaze from one location to another via rapid eye movements, called saccades. (mpg.de)
Because eye movements are essentially motor movements, it takes time to plan and execute a saccade. (scholarpedia.org)
In our system, the human-robot interface works through ocular movements (saccades and blinks), which are acquired as EOG signals and classified using a Convolutional Neural Network. (ro-man2019.org)
Saccades are very fast eye movements that allow the eyes to quickly move from one target or image to another. (uconn.edu)
Saccade characteristics were investigated, and the results of saccadic eye movements elicited by the three different stimuli types were compared. (uconn.edu)
First, we complement existing state-of-the art large-scale dynamic computer vision datasets like Hollywood-2 and UCF Sports with human eye movements collected under the ecological constraints of the visual action recognition task. (aau.dk)
During gaze anchoring, we found that neurons in the reach region of the posterior parietal cortex can inhibit neuronal firing in the parietal saccade region to suppress eye movements and improve reach accuracy. (nature.com)
All characters now have small quick eye movements (saccades), similar to human eye movements in real life. (shoujocity.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)
We used an oculomotor deferred saccade task, in which the sensory cue was continuously present throughout the delay interval, rather than merely being transiently flashed prior to the delay interval. (nyu.edu)
This paradigm eliminated the memory component (i.e., the need to remember the location of the saccade target) and placed the emphasis squarely upon oculomotor planning. (nyu.edu)
We developed a methodological pipeline involving regression-based deconvolution modeling, allowing our analyses to account for overlapping EEG responses owing to the saccade sequence and other oculomotor covariates. (lu.se)
These results show that cognitive and motor disorders can be dissociated in the LD MPTP model and that cognitive and oculomotor impairments develop before the onset of skeletal motor symptoms. (huji.ac.il)

In most cases, details that cannot be perceived by the human eye are regarded as irrelevant and referred to as perceptual redundancy. (informit.com)
substantially, but retain the grouping of perceptual, diagnostic, and inferential processes for modeling purposes. (nationalacademies.org)
We show that the presence of action relations between stimuli helps reduce visual extinction in patients with limited attention to the contralesional side of space, while the first saccades made by normal observers and early perceptual and attentional responses measured using electroencephalography/event-related potentials are modulated by preparation of action and by seeing objects being grasped correctly or incorrectly for action. (ox.ac.uk)
Using evidence accumulation modeling to quantify the relative contributions of spatial attention and saccade preparation in perceptual tasks. (ampl-psych.com)
Leveraging the opportunity to directly access the subthalamic nucleus of the basal ganglia in humans undergoing deep brain stimulation surgery, we here combine invasive electrophysiological recordings, electrical stimulation and computational modelling of perceptual decision-making. (nature.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)
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)
Here we model the relationship between spatial intensity patterns in natural images and the response of the saccadic system using tools from machine learning. (mpg.de)
For the saccadic system, there is a clear dissociation between the fast motor correction (corrective saccade production) and the adaptive motor recalibration (primary saccade modification). (ox.ac.uk)
Error signals used to trigger corrective saccades and to induce adaptation are based on post-saccadic visual feedback. (ox.ac.uk)
The goal of this study was to determine if similar or different error signals are involved in saccadic adaptation and in corrective saccade generation. (ox.ac.uk)
We found that saccadic adaptation and corrective saccade production were both affected by the manipulations of post-saccadic visual information, but in different ways. (ox.ac.uk)
Interestingly, voluntary saccades required a longer duration of post-saccadic target presentation to reach the same amount of adaptation as reactive saccades. (ox.ac.uk)
These last observations suggest that post-saccadic perception depends on the previously performed action and that the differences between saccade categories of motor correction and adaptation occur at an early level of visual processing. (ox.ac.uk)
Human saccade data was collected using a high speed eye tracking system, and analyzed with a program written in FORTRAN, which computed parameter estimates using system identification technique for a saccadic eye movement model. (uconn.edu)
Modeling Saccadic Targeting in Visual Search. (auth.gr)

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)
We should also note that considerable research remains to be done on defining, understanding, and quantifying situation awareness as necessary precursors to the eventual development of valid descriptive process models that accurately and reliably model human behavior in this arena. (nationalacademies.org)
Because of the early stage of the research on situation awareness, much of the discussion that follows focuses on potential prescriptive (as opposed to descriptive) modeling approaches that may, in the longer term, prove to be valid representations of human situation assessment behavior. (nationalacademies.org)
Organizational Behavior and Human Decision Processes, 68 (1), 28-43. (springer.com)
Organizational Behavior and Human Performance, 16 (2), 366-387. (springer.com)
Computers in Human Behavior, 89 (August), 471-475. (cedtech.net)
Computers in Human Behavior, 89 , 411-417. (cedtech.net)
Computers in Human Behavior, 89 , 418-429. (cedtech.net)
Computers in Human Behavior, 89 , 395-398. (cedtech.net)

For humans, visual tracking of moving stimuli often triggers catch-up saccades during smooth pursuit. (eneuro.org)
For humans, it is therefore a natural choice of stimuli to investigate how exploration strategies change with learning. (elifesciences.org)
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)

In summary, our data supports our hypothesized predicted error-based decision process for coordinating saccades during smooth pursuit. (eneuro.org)
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)
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)
As a consequence, the properties of saccades and smooth pursuit were studied independently. (eneuro.org)

There is larger pupil constriction evoked by a bright stimulus when the stimulus location spatially overlaps with the locus of attention, and these effects have been extended to saccade planning and working memory (here referred to as pupil local-luminance modulation). (tmu.edu.tw)
2022 ) Saccades and presaccadic stimulus repetition alter cortical network topology and dynamics: evidence from EEG and graph theoretical analysis. (neurotree.org)
2022 ) Linear vector models of time perception account for saccade and stimulus novelty interactions. (neurotree.org)

Therefore, we have developed an eye optics model which can calculate the blurred retinal image based on known physiological evidences to provide a more realistic input to retinal and visual cortex model. (biomedcentral.com)
The eye movement model generates random saccades and the pupil model modifies pupil diameter according to the mean luminance of retinal image. (biomedcentral.com)
As a result, our model could reproduce the effect of chromatic aberration, pupil diameter and age on the blurred retinal image. (biomedcentral.com)
Liang J, Williams DR: Aberrations and retinal image quality of the normal human eye. (biomedcentral.com)

2022 ) Action planning modulates the representation of object features in human fronto-parietal and occipital cortex. (neurotree.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)
However, there is a lack of general empirical models that integrate cognitive beliefs, physiological experience, and symptoms in healthy and clinical populations. (bvsalud.org)

In the period between saccades the direction of gaze is held fixed for a few hundred milliseconds (fixations). (mpg.de)
Remarkably, however, after only a few fixations we perceive a coherent, high-resolution scene despite the visual acuity of the eye quickly decreasing away from the center of gaze: This suggests an effective strategy for selecting saccade targets. (mpg.de)
Is the eye-movement field confused about fixations and saccades? (lu.se)

Among the types of depression, the Major Depressive Disorder (MDD) is the most recurrent and common Beck's cognitive model (1967) argues that information processing has negative biases in levels of interpretation and analysis of attentional processes (Park et al. (bvsalud.org)

Frontiers in Human Neuroscience , 16 , 文章 1044893. (tmu.edu.tw)

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)
Parameter estimations were calculated using the system identification technique for saccade parameters and neural inputs. (longdom.org)
As inputs of the model, multispectral images taken by multispectral camera or converted from RGB image can be utilized. (biomedcentral.com)

In this study, we present behavioral data complemented by computational model predictions in support of an intuitive trigger mechanism that relies on probabilistic estimation of future position error (PE). (eneuro.org)
Saccade amplitude transition function (ATF) and response latency indicated the saccade programming mechanism. (longdom.org)

Spatiotopic coding of BOLD signal in human visual cortex depends on spatial attention. (rctn.org)

In contrast to a counter that integrates events, the "state-dependent networks" model proposes that the ubiquity of time-varying neuronal properties allows networks to inherently encode temporal information ( Buonomano and Merzenich, 1995 ). (jneurosci.org)

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)
The project will explore an already collected eye-tracking dataset from Rhesus monkey subjects, and aims to investigate the links between gaze patterns and computational models of attention and reinforcement learning. (fraunhofer.pt)
Furthermore, while previous evidence from computational models and empirical studies suggests that the basal ganglia play an important role during adjustments of decision-making, it remains unclear how this is implemented. (nature.com)

van de Kraats J, van Norren D: Optical density of the aging human ocular media in the visible and the UV. (biomedcentral.com)

Although research in monkeys has further elucidated a central role of the frontal eye field (FEF) and superior colliculus in the pupil local-luminance modulation, their roles remain to be established in humans. (tmu.edu.tw)
Together, our results constitute the first evidence of FEF modulation in human pupil local-luminance responses. (tmu.edu.tw)

Dynamic model of the vergence eye movement system: simulations using MATLAB/SIMULINK. (reading.ac.uk)
We simulated a closed-loop system connecting the proposed model to a simple eye movement model and pupil model. (biomedcentral.com)
An Equilibrium Point based Model Unifying Movement Control in Humanoids. (auth.gr)

Through applying continuous theta-burst transcranial magnetic stimulation over the right FEF (and vertex) to inhibit its activity, we investigated the role of the FEF in human pupil local-luminance responses. (tmu.edu.tw)
Linear mixed model results further found that stimulation condition, patch location consistency, and visual field significantly modulated observed pupil constriction responses. (tmu.edu.tw)

La información más reciente sobre el nuevo Coronavirus de 2019, incluidas las clínicas de vacunación para niños de 6 meses en adelante. (stanfordchildrens.org)

2022 ) Integration of allocentric and egocentric visual information in a convolutional/multilayer perceptron network model of goal-directed gaze shifts. (neurotree.org)

First, the duration of the displaced target after primary saccade termination was set at 15, 50, 100 or 800 ms in different adaptation sessions. (ox.ac.uk)

We show that center-surround patterns emerge as the optimal solution to the problem of predicting saccade targets. (mpg.de)

While the sparse, interest-point based approach to recognition is not inconsistent with visual processing in biological systems that operate in "saccade and fixate" regimes, the knowledge, methodology, and emphasis in the human and the computer vision communities remains sharply distinct. (aau.dk)

A neural network architecture models how humans learn and consciously perform musical lyrics and melodies with variable rhythms and beats, using brain design principles and mechanisms that evolved earlier than human musical capabilities, and that have explained and predicted many kinds of psychological and neurobiological data. (frontiersin.org)
The current article complements these contributions by developing a neural model of the brain mechanisms that regulate how humans consciously perceive, learn, and perform music. (frontiersin.org)

Because they rely on different mechanisms, the adaptation of reactive saccades and the adaptation of voluntary saccades were both evaluated. (ox.ac.uk)
This article proposes brain design principles, mechanisms, and architectures that enable humans to learn and consciously perform lyrics and melodies with variable rhythms and beats. (frontiersin.org)
For this purpose, two new mechanisms in the proposed model are described and analyzed in detail. (zbmath.org)

V. Multivariate statistical analyses and models. (rctn.org)
The processed data consists of tens of thousands of growth curves with a complex hierarchical structure requiring sophisticated statistical modelling of genetic independence, genetic interaction (epistasis), and variation at multiple levels of the hierarchy. (lu.se)

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

Hence, many imaging system design choices and parameters, including spatial and temporal resolution as well as color representation, have been inspired by or selected to imitate the properties of human vision. (informit.com)

The dynamics of model components are evaluated in relation to neurophysiological data collected from the frontal lobe and midbrain of macaque monkeys performing visual search and stopping tasks. (visionsciences.org)
Systems based on bag-of-words models operating on image features collected at maxima of sparse interest point operators have been successful for both computer-based visual object and action recognition tasks. (aau.dk)

A scientifically sound answer requires understanding the complex processing that takes place in the entire human visual pathway , including processing on the retina, in the Lateral Geniculate Nucleus, and by the visual cortex of the brain. (sigarch.org)
By applying our model to the large-scale visual system model, it is expected to be able to evaluate the phenomena, for example, age dependent perception on visual illusions, blur compensation in retina or visual cortex, and so on. (biomedcentral.com)

Finally, the visual mask interfered with the production of corrective saccades only during the voluntary saccades adaptation task. (ox.ac.uk)
During a robot to human object handover task, several intended or unintended events may occur with the object - it may be pulled, pushed, bumped or simply held - by the human receiver. (ro-man2019.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)
in our data, this resulted in longer saccade trigger times and more smooth trials without saccades. (eneuro.org)

Journal of Experimental Psychology: Human Perception and Performance, 31 , 954-969. (cedtech.net)

Here we study inhibitory communication during a flexible, natural behaviour, termed gaze anchoring, in which saccades are transiently inhibited by coordinated reaches. (nature.com)

In this sense, we, computing systems designers, can directly modulate human visual perception (HVP) - even without implanting a device into the human brain. (sigarch.org)
Timing of readiness potentials reflect a decision-making process in the human brain. (ampl-psych.com)
New discoveries in psychophysics, electrophysiology, imaging, and computational modeling are contributing to an emerging picture of how the brain processes, learns, and perceives time. (jneurosci.org)
Neglect is most prominent and long-lasting after damage to the right hemisphere of the human brain, particularly following a stroke. (scholarpedia.org)
Short parietal lobe connections of the human and monkey brain. (nature.com)
The prefrontal cortex is an extensive and important area of the human brain--approximately 30% of the cerebral cortex--that is situated in the front part of the frontal lobe. (sicotests.com)
2010) Vascular pathology in theaged human brain. (relaxapartmanitara.com)

The functions of the PFC give rise to higher-level cognitive abilities that make us uniquely human. (nyu.edu)
Eye-tracking technologies are becoming increasingly available and provide novel opportunities to learn more about human visual perception and cognitive processes. (fraunhofer.pt)
There is considerable overlap between the cognitive deficits observed in humans with frontal lobe damage and those described in patients with Parkinson's disease. (huji.ac.il)

Similar frontal impairments have been found in the 1- methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) primate model of Parkinsonism. (huji.ac.il)

Understanding Human Behaviors Based on Eye-Head-Hand Coordination. (auth.gr)

propose that a simple "counter" model can account for distortions of time perception over short timescales. (jneurosci.org)

Results show that the approach is a promising step in the concept put forward for collaborative Human-Robotic Interaction (HRI), and opens a path for future research. (ro-man2019.org)
Training data from tactile sensors were recorded during interaction of human subjects with the object held by a 3-finger robotic hand. (ro-man2019.org)
9. Hasebe S, Nonaka F, Ohtsuki H. Accuracy of accommodation in heterophoric patients: testing an interaction model in a large clinical sample. (reading.ac.uk)
Comparing estimators for latent interaction models under structural and distributional misspecifications. (uzh.ch)
A total of 61 students first watched these videos by interacting with an eye-tracking device in a human-computer interaction lab and then completed a retention test. (cedtech.net)

I'm liveblogging the Workshop on Security and Human Behaviour which is being held at Google in New York. (lightbluetouchpaper.org)
Security and Human Behaviour 2012 was kicked off by Jeff Hancock, who studies "butler lies" such as "my boss has just called me into an important meeting" that make up about 2% of all text messaging they have studied. (lightbluetouchpaper.org)

The loss of foveal vision means that these foveating saccades will be counterproductive. (visionsciences.org)
Retrieved de Human Vision and Electronic Imaging, San Francisco Ca, USA. (ski.org)

Each has assumed importance because it captures a characteristic of human performance that is not directly observable, but that psychologists-especially engineering psychologists and human factors specialists-have been asked to assess, or purposefully manipulate because of its importance to everyday living and working. (nationalacademies.org)
Facial expression recognition models have shown good performance in a facial expression image dataset that expresses emotion without considering speaking effect. (ro-man2019.org)

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

In fact, essentially all models of working memory require the persistence of a representation (e.g. (nyu.edu)

Summary: A novel model of object-based visual attention extending Duncan's Integrated Competition Hypothesis [Philos. (zbmath.org)

Anatomy13

Organisms4

Diseases8

Chemicals and Drugs2

Analytical, Diagnostic and Therapeutic Techniques and Equipment9

Psychiatry and Psychology21

Phenomena and Processes24

Information Science2

Health Care2

Fixation8

Movements16

Oculomotor5

Perceptual5

Saccadic11

Behavior9

Stimuli3

Smooth pursuit4

Stimulus3

Retinal4

Modulates1

Physiological2

Fixations3

Attentional1

Neuroscience1

Inputs4

Mechanism2

Spatial attention1

Neuronal1

Computational models3

Ocular1

Modulation2

Movement3

Stimulation2

20191

20221

Duration1

Targets1

Biological1

Neural2

Mechanisms3

Statistical2

Pursuit1

Imaging system1

Tasks2

Visual cortex2

Task2

Trigger2

Experimental1

Reaches1

Brain7

Cognitive3

Impairments1

Coordination1

Time1

Interaction5

Behaviour2

Vision2

Performance2

Paradigm1

Working memory1

Attention1