keyword
MENU ▼
Read by QxMD icon Read
search

Eye movements

keyword
https://www.readbyqxmd.com/read/28448671/disrupted-eye-movements-in-preperimetric-primary-open-angle-glaucoma
#1
Raymond P Najjar, Sourabh Sharma, Morgane Drouet, Stephanie Leruez, Mani Baskaran, Monisha E Nongpiur, Tin Aung, Joanne Fielding, Owen White, Michael J Girard, Cédric Lamirel, Dan Milea
Purpose: Primary open-angle glaucoma (POAG) can be associated with abnormal ocular motor behavior, possibly as a compensatory strategy following visual field loss. The aim of this study was to explore the characteristics of saccadic eye movements in patients with early-stage POAG without any detectable glaucomatous visual field loss (i.e., preperimetric POAG). Methods: Binocular eye movements were explored in 16 patients with bilateral preperimetric POAG and 16 age-matched healthy controls in a cross-sectional, observational study...
April 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28447860/remote-sensing-of-physiological-signs-using-a-machine-vision-system
#2
Ali Al-Naji, Kim Gibson, Javaan Chahl
The aim of this work is to remotely measure heart rate (HR) and respiratory rate (RR) using a video camera from long range (> 50 m). The proposed system is based on imperceptible signals produced from blood circulation, including skin colour variations and head motion. As these signals are not visible to the naked eye and to preserve the signal strength in the video, we used an improved video magnification technique to enhance these invisible signals and detect the physiological activity within the subject...
April 27, 2017: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/28447810/surviving-blind-decomposition-a-distributional-analysis-of-the-time-course-of-complex-word-recognition
#3
Daniel Schmidtke, Kazunaga Matsuki, Victor Kuperman
The current study addresses a discrepancy in the psycholinguistic literature about the chronology of information processing during the visual recognition of morphologically complex words. Form-then-meaning accounts of complex word recognition claim that morphemes are processed as units of form prior to any influence of their meanings, whereas form-and-meaning models posit that recognition of complex word forms involves the simultaneous access of morphological and semantic information. The study reported here addresses this theoretical discrepancy by applying a nonparametric distributional technique of survival analysis (Reingold & Sheridan, 2014) to 2 behavioral measures of complex word processing...
April 27, 2017: Journal of Experimental Psychology. Learning, Memory, and Cognition
https://www.readbyqxmd.com/read/28446896/fixation-patterns-of-chinese-participants-while-identifying-facial-expressions-on-chinese-faces
#4
Mu Xia, Xueliu Li, Haiqing Zhong, Hong Li
Two experiments in this study were designed to explore a model of Chinese fixation with four types of native facial expressions-happy, peaceful, sad, and angry. In both experiments, participants performed an emotion recognition task while their behaviors and eye movements were recorded. Experiment 1 (24 participants, 12 men) demonstrated that both eye fixations and durations were lower for the upper part of the face than for the lower part of the face for all four types of facial expression. Experiment 2 (20 participants, 6 men) repeated this finding and excluded the disturbance of fixation point...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28446867/response-properties-of-motor-equivalence-neurons-of-the-primate-premotor-cortex
#5
Eleftherios Neromyliotis, A K Moschovakis
To study the response properties of cells that could participate in eye-hand coordination we trained two macaque monkeys to perform center-out saccades and pointing movements with their right or left forelimb toward visual targets presented on a video display. We analyzed the phasic movement related discharges of neurons of the periarcuate cortex that fire before and during saccades and movements of the hand whether accompanied by movements of the other effector or not. Because such cells could encode an abstract form of the desired displacement vector without regard to the effector that would execute the movement we refer to such cells as motor equivalence neurons (Meq)...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28445553/a-novel-rat-head-gaze-determination-system-based-on-optomotor-responses
#6
Mengbo You, Toshiyuki Yamane, Hiroshi Tomita, Eriko Sugano, Takuya Akashi
The optomotor response of animals is commonly used to measure their visual performance, e.g., rats of different genetically altered strains or various drug tests. With the presentation of stimuli using computer screens or projectors, the common idea focuses on measuring the eye movement or head and/or body movement to characterize changes of the head gaze. However, traditional methods rely on either the invasive fixation of animals, or the judgment of a human observer who reports the stimulus-tracking movements...
2017: PloS One
https://www.readbyqxmd.com/read/28444834/direct-and-indirect-effects-of-attention-and-visual-function-on-gait-impairment-in-parkinson-s-disease-influence-of-task-and-turning
#7
Samuel Stuart, Brook Galna, Louise S Delicato, Sue Lord, Lynn Rochester
Gait impairment is a core feature of Parkinson's disease (PD) which has been linked to cognitive and visual deficits, but interactions between these features are poorly understood. Monitoring saccades allows investigation of real-time cognitive and visual processes and their impact on gait when walking. This study explored; 1) saccade frequency when walking under different attentional manipulations of turning and dual-task; and 2) direct and indirect relationships between saccades, gait impairment, vision and attention...
April 26, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28444788/night-sleep-in-patients-with-vegetative-state
#8
Yuri G Pavlov, Steffen Gais, Friedemann Müller, Monika Schönauer, Barbara Schäpers, Jan Born, Boris Kotchoubey
Polysomnographic recording of night sleep was carried out in 15 patients with the diagnosis vegetative state (syn. unresponsive wakefulness syndrome). Sleep scoring was performed by three raters, and confirmed by means of a spectral power analysis of the electroencephalogram, electrooculogram and electromyogram. All patients but one exhibited at least some signs of sleep. In particular, sleep stage N1 was found in 13 patients, N2 in 14 patients, N3 in nine patients, and rapid eye movement sleep in 10 patients...
April 26, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28444767/the-dual-orexin-receptor-antagonist-dora-22-lowers-histamine-levels-in-the-lateral-hypothalamus-and-prefrontal-cortex-without-lowering-hippocampal-acetylcholine
#9
Lihang Leon Yao, Andres Ramirez, Anthony J Roecker, Steven Fox, Jason Uslaner, Sean M Smith, Robert Hodgson, Paul J Coleman, John J Renger, Christopher J Winrow, Anthony L Gotter
Chronic insomnia is defined as a persistent difficulty with sleep initiation maintenance or non-restorative sleep. The therapeutic standard of care for this condition is treatment with gamma-aminobutyric acid (GABA)A receptor modulators, which promote sleep but are associated with a panoply of side effects, including cognitive and memory impairment. Dual orexin receptor antagonists (DORAs) have recently emerged as an alternative therapeutic approach that acts via a distinct and more selective wake-attenuating mechanism with the potential to be associated with milder side effects...
April 26, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28444634/watching-diagnoses-develop-eye-movements-reveal-symptom-processing-during-diagnostic-reasoning
#10
Agnes Scholz, Josef F Krems, Georg Jahn
Finding a probable explanation for observed symptoms is a highly complex task that draws on information retrieval from memory. Recent research suggests that observed symptoms are interpreted in a way that maximizes coherence for a single likely explanation. This becomes particularly clear if symptom sequences support more than one explanation. However, there are no existing process data available that allow coherence maximization to be traced in ambiguous diagnostic situations, where critical information has to be retrieved from memory...
April 25, 2017: Psychonomic Bulletin & Review
https://www.readbyqxmd.com/read/28444617/computational-theory-underlying-acute-vestibulo-ocular-reflex-motor-learning-with-cerebellar-long-term-depression-and-long-term-potentiation
#11
Keiichiro Inagaki, Yutaka Hirata
The vestibulo-ocular reflex (VOR) can be viewed as an adaptive control system that maintains compensatory eye movements during head motion. As the cerebellar flocculus is intimately involved in this adaptive motor control of the VOR, the VOR has been a popular model system for investigating cerebellar motor learning. Long-term depression (LTD) and long-term potentiation (LTP) at the parallel fiber-Purkinje cell synapses are considered to play major roles in cerebellar motor learning. A recent study using mutant mice demonstrated cerebellar motor learning with hampered LTD; the study concluded that the parallel fiber-Purkinje cell LTD is not essential...
April 25, 2017: Cerebellum
https://www.readbyqxmd.com/read/28443035/next-speakers-plan-their-turn-early-and-speak-after-turn-final-go-signals
#12
Mathias Barthel, Antje S Meyer, Stephen C Levinson
In conversation, turn-taking is usually fluid, with next speakers taking their turn right after the end of the previous turn. Most, but not all, previous studies show that next speakers start to plan their turn early, if possible already during the incoming turn. The present study makes use of the list-completion paradigm (Barthel et al., 2016), analyzing speech onset latencies and eye-movements of participants in a task-oriented dialogue with a confederate. The measures are used to disentangle the contributions to the timing of turn-taking of early planning of content on the one hand and initiation of articulation as a reaction to the upcoming turn-end on the other hand...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28441425/role-of-route-previewing-strategies-on-climbing-fluency-and-exploratory-movements
#13
Ludovic Seifert, Romain Cordier, Dominic Orth, Yoan Courtine, James L Croft
This study examined the role of route previewing strategies on climbing fluency and on exploratory movements of the limbs, in order to understand whether previewing helps people to perceive and to realize affordances. Eight inexperienced and ten experienced climbers previewed a 10 m high route of 5b difficulty on French scale, then climbed it with a top-rope as fluently as possible. Gaze behavior was collected from an eye tracking system during the preview and allowed us to determine the number of times they scanned the route, and which of four route previewing strategies (fragmentary, ascending, zigzagging, and sequence-of-blocks) they used...
2017: PloS One
https://www.readbyqxmd.com/read/28440863/fewdon-mnd-syndrome-finger-extension-weakness-and-downbeat-nystagmus-a-novel-motor-neuron-disorder
#14
Aline Delva, Nimish Thakore, Erik Pioro, Koen Poesen, Rachel Saunders-Pullman, Inge A Meijer, Janet C Rucker, John T Kissel, Philip Van Damme
Introduction Disturbances of eye movements are infrequently encountered in motor neuron diseases or motor neuropathies, and there is no known syndrome that combines progressive muscle weakness with downbeat nystagmus. Methods To describe the core clinical features of a syndrome of motor neuron disease associated with downbeat nystagmus, clinical features were collected from 6 patients. Results All patients had slowly progressive muscle weakness and wasting, in combination with downbeat nystagmus, which was clinically most obvious in downward and lateral gaze...
April 25, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28440258/neuroretinitis-as-presenting-and-the-only-presentation-of-lyme-disease-diagnosis-and-management
#15
Brahm Prakash Guliani, Sandeep Kumar, Neha Chawla, Anuj Mehta
We present a case of neuroretinitis as presenting and the only presentation of Lyme disease in a 25-year-old female who visited hilly areas in the Himalayas of North India. She presented with right eye sudden and painless blurring of vision. Her vision at presentation was 20/60. She had fundus examination; fundus fluorescein angiography (FFA) and optical coherence tomography (OCT) imaging showed classical features of neuroretinitis. No other organ was involved. Oral steroids were prescribed and relevant investigations sent for noninfective and infective causes...
March 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28439779/searching-for-an-internal-representation-of-stimulus-kinematics-in-the-response-of-ventral-paraflocculus-purkinje-cells
#16
Pablo M Blazquez, GyuTae Kim, Tatyana A Yakusheva
Motor control theories propose that the central nervous system builds internal representations of the motion of both our body and external objects. These representations, called forward models, are essential for accurate motor control. For instance, to produce a precise reaching movement to catch a flying ball, the central nervous system must build predictions of the current and future states of both the arm and the ball. Accumulating evidence suggests that the cerebellar cortex contains a forward model of an individual's body movement...
April 24, 2017: Cerebellum
https://www.readbyqxmd.com/read/28439075/switch-from-ambient-to-focal-processing-mode-explains-the-dynamics-of-free-viewing-eye-movements
#17
Junji Ito, Yukako Yamane, Mika Suzuki, Pedro Maldonado, Ichiro Fujita, Hiroshi Tamura, Sonja Grün
Previous studies have reported that humans employ ambient and focal modes of visual exploration while they freely view natural scenes. These two modes have been characterized based on eye movement parameters such as saccade amplitude and fixation duration, but not by any visual features of the viewed scenes. Here we propose a new characterization of eye movements during free viewing based on how eyes are moved from and to objects in a visual scene. We applied this characterization to data obtained from freely-viewing macaque monkeys...
April 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28437637/analysis-of-free-moment-and-center-of-pressure-frequency-components-during-quiet-standing-using-magnitude-squared-coherence
#18
Dean C Hay, Mark P Wachowiak
To date, no postural studies have investigated the specific relationship between linear (anteroposterior (AP) and mediolateral (ML)) postural sway and the free moment (FM) over the range of biomechanically important frequencies. The goal of the current paper is to study the relationship between FM and the AP/ML movements during quiet standing with respect to individual frequencies. Mean squared coherence, which measures the degree of the relationship between two signals as a function of frequency, is employed to address this question...
April 21, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28437518/a-middle-aged-man-with-progressive-ophthalmoparesis-ataxia-and-spastic-paraparesis
#19
Nathan H Kung, Gregory P Van Stavern, Robert C Bucelli
A 50-year old man presented for evaluation of progressive gait ataxia with a superimposed spastic paraparesis. During his clinic visit, he was also observed to have slow and limited eye movements. In this article, we discuss the clinical approach to this triad of symptoms and guide the reader to discover the patient's ultimate genetic diagnosis.
April 24, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/28435209/increase-in-average-foveal-thickness-after-internal-limiting-membrane-peeling
#20
Kazuyuki Kumagai, Mariko Furukawa, Tetsuyuki Suetsugu, Nobuchika Ogino
PURPOSE: To report the findings in three cases in which the average foveal thickness was increased after a thin epiretinal membrane (ERM) was removed by vitrectomy with internal limiting membrane (ILM) peeling. METHODS: The foveal contour was normal preoperatively in all eyes. All cases underwent successful phacovitrectomy with ILM peeling for a thin ERM. The optical coherence tomography (OCT) images were examined before and after the surgery. The changes in the average foveal (1 mm) thickness and the foveal areas within 500 μm from the foveal center were measured...
2017: Clinical Ophthalmology
keyword
keyword
12075
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"