keyword
MENU ▼
Read by QxMD icon Read
search

Saccades

keyword
https://www.readbyqxmd.com/read/29766769/movement-vigor-as-a-trait-like-attribute-of-individuality
#1
Thomas Reed Reppert, Ioannis Rigas, David Herzfeld, Ehsan Sedaghat-Nejad, Oleg Komogortsev, Reza Shadmehr
A common aspect of individuality is our subjective preferences in evaluation of reward and effort. The neural circuits that evaluate these commodities influence circuits that control our movements, raising the possibility that vigor differences between individuals may also be a trait of individuality, reflecting a willingness to expend effort. In contrast, classic theories in motor-control suggest that vigor differences reflect a speed-accuracy trade-off, predicting that those who move fast are sacrificing accuracy for speed...
May 16, 2018: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29766396/a-novel-evaluation-of-two-related-and-two-independent-algorithms-for-eye-movement-classification-during-reading
#2
Lee Friedman, Ioannis Rigas, Evgeny Abdulin, Oleg V Komogortsev
Nystrӧm and Holmqvist have published a method for the classification of eye movements during reading (ONH) (Nyström & Holmqvist, 2010). When we applied this algorithm to our data, the results were not satisfactory, so we modified the algorithm (now the MNH) to better classify our data. The changes included: (1) reducing the amount of signal filtering, (2) excluding a new type of noise, (3) removing several adaptive thresholds and replacing them with fixed thresholds, (4) changing the way that the start and end of each saccade was determined, (5) employing a new algorithm for detecting PSOs, and (6) allowing a fixation period to either begin or end with noise...
May 15, 2018: Behavior Research Methods
https://www.readbyqxmd.com/read/29766038/frontal-eye-field-inactivation-reduces-saccade-preparation-in-the-superior-colliculus-but-does-not-alter-how-preparatory-activity-relates-to-saccades-of-a-given-latency
#3
Suryadeep Dash, Tyler R Peel, Stephen G Lomber, Brian D Corneil
A neural correlate for saccadic reaction times (SRTs) in the gap saccade task is the level of low-frequency activity in the intermediate layers of the superior colliculus (iSC) just before visual target onset: greater levels of such preparatory iSC low-frequency activity precede shorter SRTs. The frontal eye fields (FEFs) are one likely source of iSC preparatory activity, since FEF preparatory activity is also inversely related to SRT. To better understand the FEF's role in saccade preparation, and the way in which such preparation relates to SRT, in two male rhesus monkeys, we compared iSC preparatory activity across unilateral reversible cryogenic inactivation of the FEF...
March 2018: ENeuro
https://www.readbyqxmd.com/read/29765090/a-rightward-saccade-to-an-unexpected-stimulus-as-a-marker-for-lateralised-visuospatial-attention
#4
Masafumi Sanefuji, Hiroshi Yamashita, Michiko Torio, Daisuke Katsuki, Satoshi Akamine, Yoshito Ishizaki, Junji Kishimoto, Yasunari Sakai, Hidetoshi Takada, Keiko Yoshida, Shouichi Ohga
The human brain is lateralised to the right for visuospatial attention, particularly when reorienting attention to unexpected stimuli. However, the developmental characteristics of lateralisation remain unclear. To address this question, we devised a saccade task applicable for both adults and children. To assess the utility of this system, we investigated the correlation between line bisection test performance and the saccade task for 54 healthy adult volunteers. Participants followed a visual target that jumped 10 times, alternating between two fixed positions across the midline with a constant pace...
May 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29763770/the-development-of-object-based-attention-in-infants
#5
Shuma Tsurumi, So Kanazawa, Masami K Yamaguchi
We examined whether infants aged 6-8 months show object-based attention using the preferential looking method. In object-based attention, which is a prerequisite function for efficient real-world processing of various stimuli, a target that appears at a cued object is detected and processed faster than a target appearing at an uncued object. We presented 6- to 8-month-old infants with the visual stimuli consisting of two white vertical rectangles side by side, in which a target appearing at 1) the cued location, 2) the end opposite to the cued location, and 3) another rectangle's end following the cue, using an established paradigm, and measured each infant's first saccade to the target...
May 11, 2018: Infant Behavior & Development
https://www.readbyqxmd.com/read/29762197/high-frequency-horizontal-semicircular-canal-function-in-certain-meni%C3%A3-re-s-disease
#6
Claudia Jerin, Rebecca Maxwell, Robert Gürkov
OBJECTIVES: To characterize video head impulse testing (vHIT) in definitive Menière's disease and to investigate the relationship between vHIT results and other audiovestibular function tests. DESIGN: Fifty-four patients with certain Menière's disease, that is, patients with clinically definite Menière's disease and endolymphatic hydrops visualized by locally enhanced inner ear MR imaging, were recruited for this study. All patients underwent vHIT. The vestibular-ocular reflex gain at 60 ms and refixation saccades were the outcome parameters measured...
May 14, 2018: Ear and Hearing
https://www.readbyqxmd.com/read/29761961/-study-on-method-of-laparoscopic-training-based-on-eye-gaze-tracking-techniques
#7
Mingzhe Xu, Shuyi Wang, Shasha Ye
In current domestic research on laparoscopic training, researchers usually consider instrument movement path in the hand-eye coordination relationship. However, they ignore the information contained in visual cues by which could guide and control instrument movements. Studies in other areas have shown that trainers can improve their perceptual-motor skills by gaze training. This paper was designed to examine the effectiveness of eye gaze tracking technology in laparoscopic training and to analyze gaze strategy of the subjects in different training methods...
October 1, 2017: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
https://www.readbyqxmd.com/read/29757553/-the-manifestation-of-videonystamography-in-the-patients-with-posterior-circulation-ischemia-vertigo
#8
Hao Wei Wang, Ying Guo, Jing Zhou, Hui Fang Zhou
Objective: To investigate the changes of vedionystamography(VNG)in patients with posterior circulation ischemia vertigo(PCIV). Method: Fifty patients who complained of vertigo and imbalance with PCI were selected as experimental group for testing of visual nystamography(VNG).Thirty normal subjects were chosen as control group.The result was analyzed. Result: The results of VNG in PCIV group and the control group were compared.The abnormal ratio were as follows:(4%,0; P >0.05)for Spontaneous nystagmus,(68%,10%; P <0...
January 20, 2018: Journal of Clinical Otorhinolaryngology, Head, and Neck Surgery
https://www.readbyqxmd.com/read/29756830/inertial-movements-of-the-iris-as-the-origin-of-postsaccadic-oscillations
#9
S Bouzat, M L Freije, A L Frapiccini, G Gasaneo
Recent studies on the human eye indicate that the pupil moves inside the eyeball due to deformations of the iris. Here we show that this phenomenon can be originated by inertial forces undergone by the iris during the rotation of the eyeball. Moreover, these forces affect the iris in such a way that the pupil behaves effectively as a massive particle. To show this, we develop a model based on the Newton equation on the noninertial reference frame of the eyeball. The model allows us to reproduce and interpret several important findings of recent eye-tracking experiments on saccadic movements...
April 27, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/29750273/video-head-impulse-test-to-preoperatively-identify-the-nerve-of-origin-of-vestibular-schwannomas
#10
Felipe Constanzo, Patricia Sens, Bernardo Corrêa de Almeida Teixeira, Ricardo Ramina
BACKGROUND: Identification of the nerve of origin in vestibular schwannoma (VS) is an important prognostic factor for hearing preservation surgery. Thus far, vestibular functional tests and magnetic resonance imaging have not yielded reliable results to preoperatively evaluate this information. The development of the video head impulse test (vHIT) has allowed a precise evaluation of each semicircular canal, and its localizing value has been tested for some peripheral vestibular diseases, but not for VS...
May 10, 2018: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29749293/decisional-space-determines-saccadic-reaction-times-in-healthy-observers-and-acquired-prosopagnosia
#11
Meike Ramon, Nayla Sokhn, Junpeng Lao, Roberto Caldara
Determining the familiarity and identity of a face have been considered as independent processes. Covert face recognition in cases of acquired prosopagnosia, as well as rapid detection of familiarity have been taken to support this view. We tested P.S. a well-described case of acquired prosopagnosia, and two healthy controls (her sister and daughter) in two saccadic reaction time (SRT) experiments. Stimuli depicted their family members and well-matched unfamiliar distractors in the context of binary gender, or familiarity decisions...
May 11, 2018: Cognitive Neuropsychology
https://www.readbyqxmd.com/read/29747069/changes-to-online-control-and-eye-hand-coordination-with-healthy-ageing
#12
Jessica L O'Rielly, Anna Ma-Wyatt
Goal directed movements are typically accompanied by a saccade to the target location. Online control plays an important part in correction of a reach, especially if the target or goal of the reach moves during the reach. While there are notable changes to visual processing and motor control with healthy ageing, there is limited evidence about how eye-hand coordination during online updating changes with healthy ageing. We sought to quantify differences between older and younger people for eye-hand coordination during online updating...
May 7, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29740392/anti-saccades-in-cerebellar-ataxias-reveal-a-contribution-of-the-cerebellum-in-executive-functions
#13
Elena Pretegiani, Pietro Piu, Francesca Rosini, Pamela Federighi, Valeria Serchi, Gemma Tumminelli, Maria Teresa Dotti, Antonio Federico, Alessandra Rufa
Objective: Increasing evidence suggests a cerebellar contribution to modulate cognitive aspects of motor behavior and executive functions. Supporting findings come from studies on patients with neurodegenerative diseases, in which however, given the extent of the disease, the specific role of the cerebellum, could not be clearly isolated. Anti-saccades are considered a sensitive tool to test executive functions. The anti-saccade underlying neural network, consisting of different cortical areas and their downstream connections including the lateral cerebellum, has been largely clarified...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29740388/central-lesions-with-selective-semicircular-canal-involvement-mimicking-bilateral-vestibulopathy
#14
REVIEW
Luke Chen, G Michael Halmagyi
Bilateral vestibulopathy (BVP), which is due to peripheral lesions, may selectively involve certain semicircular canal (SCC). Recent eye movement recordings with search coil and video head impulse test (HIT) have provided insight in central lesions that can cause bilateral and selective SCC deficit mimicking BVP. Since neurological signs or ocular motor deficits maybe subtle or absent, it is critical to recognize central lesions correctly since there is prognostic and treatment implication. Acute floccular lesions cause bilateral horizontal SCC (HC) impairment while leaving vertical SCC function unaffected...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29738354/sex-differences-in-a-chronometric-mental-rotation-test-with-cube-figures-a-behavioral-electroencephalography-and-eye-tracking-pilot-study
#15
Clara Scheer, Felipe Mattioni Maturana, Petra Jansen
In chronometric mental rotation tasks, sex differences are widely discussed. Most studies find men to be more skilled in mental rotation than women, which can be explained by the holistic strategy that they use to rotate stimuli. Women are believed to apply a piecemeal strategy. So far, there have been no studies investigating this phenomenon using eye-tacking methods in combination with electroencephalography (EEG) analysis: the present study compared behavioral responses, EEG activity, and eye movements of 15 men and 15 women while solving a three-dimensional chronometric mental rotation test...
May 7, 2018: Neuroreport
https://www.readbyqxmd.com/read/29737578/neuronal-connections-of-direct-and-indirect-pathways-for-stable-value-memory-in-caudal-basal-ganglia
#16
Hidetoshi Amita, Hyoung F Kim, Mitchell Smith, Atul Gopal, Okihide Hikosaka
Direct and indirect pathways in the basal ganglia work together for controlling behavior. However, it is still a controversial topic whether these pathways are segregated or merged with each other. To address this issue, we studied the connections of these two pathways in the caudal parts of the basal ganglia of rhesus monkeys using anatomical tracers. Our previous studies showed that the caudal basal ganglia control saccades by conveying long-term values (stable values) of many visual objects toward the superior colliculus...
May 8, 2018: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29733665/the-capacity-of-trans-saccadic-memory-in-visual-search
#17
Nicholas J Kleene, Melchi M Michel
Maintaining a continuous, stable perception of the visual world relies on the ability to integrate information from previous fixations with the current one. An essential component of this integration is trans-saccadic memory (TSM), memory for information across saccades. TSM capacity may play a limiting role in tasks requiring efficient trans-saccadic integration, such as multiple-fixation visual search tasks. We estimated TSM capacity and investigated its relationship to visual short-term memory (VSTM) using two visual search tasks, one in which participants maintained fixation while saccades were simulated and another where participants made a sequence of actual saccades...
April 2018: Psychological Review
https://www.readbyqxmd.com/read/29730803/paroxysmal-ocular-movements-an-early-sign-in-glut1-deficiency-syndrome
#18
Sofia Reis, Joana Matias, Raquel Machado, José Paulo Monteiro
The authors describe a 3-year-old female, diagnosed with GLUT1 deficiency Syndrome, with a previously unreported mutation in exon 7 of the SLC2A1 gene: c.968_972 + 3del P. (Val323Alafs*53), characterized by a classic phenotypic of acquired microcephaly, developmental delay, ataxia, spasticity, and epilepsy. Ketogenic diet was started at the age of 30 months with epilepsy improvement. She presented paroxysmal ocular movements in the first 12 months of life, recently defined as "aberrant gaze saccades", that are present in the early phase of visual system development, being one of the first disease signs, but easily disregarded...
May 5, 2018: Metabolic Brain Disease
https://www.readbyqxmd.com/read/29729209/gaze-stability-dynamic-balance-and-participation-deficits-in-people-with-multiple-sclerosis-at-fall-risk
#19
Hina Garg, Leland E Dibble, Michael C Schubert, Jim Sibthorp, K Bo Foreman, Eduard Gappmaier
Despite the common complaints of dizziness and demyelination of afferent or efferent pathways to and from the vestibular nuclei which may adversely affect the angular Vestibulo-Ocular Reflex (aVOR) and vestibulo-spinal function in persons with Multiple Sclerosis (PwMS), few studies have examined gaze and dynamic balance function in PwMS. OBJECTIVES: 1) Determine the differences in gaze stability, dynamic balance and participation measures between PwMS and controls, 2) Examine the relationships between gaze stability, dynamic balance and participation...
May 5, 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29721518/new-approaches-to-the-analysis-of-eye-movement-behaviour-across-expertise-while-viewing-brain-mris
#20
Emily M Crowe, Iain D Gilchrist, Christopher Kent
Brain tumour detection and diagnosis requires clinicians to inspect and analyse brain magnetic resonance images. Eye-tracking is commonly used to examine observers' gaze behaviour during such medical image interpretation tasks, but analysis of eye movement sequences is limited. We therefore used ScanMatch, a novel technique that compares saccadic eye movement sequences, to examine the effect of expertise and diagnosis on the similarity of scanning patterns. Diagnostic accuracy was also recorded. Thirty-five participants were classified as Novices, Medics and Experts based on their level of expertise...
2018: Cognitive Research: Principles and Implications
keyword
keyword
22328
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"