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https://www.readbyqxmd.com/read/28816519/the-effects-of-exercise-on-a-choice-reaction-time-task-in-individuals-with-post-concussion-syndrome
#1
Stephanie A Ramautar, Alyssa A Prangley, Michael E Cinelli
PURPOSE: To assess cognitive performance differences pre- and post-exercise in individuals without concussion (non-concussed, NC) and individuals with post-concussion syndrome (PCS). METHODS: A total of 30 participants completed a choice reaction time (CRT) task in the form of an iPad application, measuring each individual's decision-making capabilities, while wearing a head-mounted eye tracker system. Participants completed four blocks of testing; the time interval between the first two blocks of trials and the last two blocks of trials was 10 minutes...
August 17, 2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/28815298/the-interaction-of-pupil-response-with-the-vergence-system
#2
Moritz Feil, Barbara Moser, Mathias Abegg
PURPOSE: A gaze shift from a target at distance to a target at near leads to pupillary constriction. The regulation of this pupillary near response is ill known. We investigated the impact of accommodation, convergence, and proximity on the pupillary diameter. METHODS: We recorded pupil size and vergence eye movements with the use of an infrared eye tracker. We determined the pupillary response in four conditions: (1) after a gaze shift from far to near without accommodation, (2) after a gaze shift from far to near with neither accommodation nor convergence, (3) after accommodation alone, and (4) after accommodation with convergence without a gaze shift to near...
August 16, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28813960/towards-free-3d-end-point-control-for-robotic-assisted-human-reaching-using-binocular-eye-tracking
#3
Roni O Maimon-Dror, Jorge Fernandez-Quesada, Giuseppe A Zito, Charalambos Konnaris, Sabine Dziemian, A Aldo Faisal
Eye-movements are the only directly observable behavioural signals that are highly correlated with actions at the task level, and proactive of body movements and thus reflect action intentions. Moreover, eye movements are preserved in many movement disorders leading to paralysis (or amputees) from stroke, spinal cord injury, Parkinson's disease, multiple sclerosis, and muscular dystrophy among others. Despite this benefit, eye tracking is not widely used as control interface for robotic interfaces in movement impaired patients due to poor human-robot interfaces...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813578/incomitance-and-eye-dominance-in-intermittent-exotropia
#4
Daniel L Adams, John R Economides, Jonathan C Horton
Purpose: To determine if the deviation angle changes in subjects with intermittent exotropia as they alternate fixation between the right and left eye in primary gaze. Methods: In this prospective observational cohort study, 37 subjects with intermittent exotropia were tested for evidence of incomitance. The position of each eye was recorded with a video tracker during fixation on a small central target. A cover-uncover test was performed by occluding one eye with a shutter that passed infrared light, allowing continuous tracking of both eyes...
August 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28810408/emotional-responses-to-disfigured-faces-and-disgust-sensitivity-an-eye-tracking-study
#5
Anna Stone, Anita Potton
Facial disfigurement attracts attention and evokes negative emotion, but evidence is lacking for a link between these two reactions. The present experiment ( n = 29) investigated emotional and attentional reactions to photographs of people with disfigured faces. An eye-tracker was used to measure fixation on internal expressive features and on the forehead. Disfigurement to the internal expressive features invoked a stronger emotional reaction than disfigurement to the forehead. Attention in the area of disfigurement was associated with negative emotion (embarrassment, sympathy, disgust, repulsion) as well as surprise...
January 1, 2017: Journal of Health Psychology
https://www.readbyqxmd.com/read/28805504/neural-basis-of-altered-earlier-attention-and-higher-order-biological-motion-processing-in-schizophrenia
#6
Yukiko Matsumoto, Hideyuki Takahashi, Jun Miyata, Genichi Sugihara, Toshiya Murai, Hidehiko Takahashi
Schizophrenia patients have impairments of biological motion (BM) perception, which provides critical information about social cognition. Because social cognition is underpinned by attention, the impairments of BM perception in schizophrenia could be partially attributable to altered attention. To elucidate the impairments in attention and social perception in schizophrenia, we investigated the neural basis of impaired BM processing using MRI in respect to attention deficits by eye tracker. Voxel-based morphometry was performed to evaluate the relationship between BM perception and gray matter (GM) volume...
August 14, 2017: Social Neuroscience
https://www.readbyqxmd.com/read/28802436/quantifying-the-cognitive-cost-of-laparo-endoscopic-single-site-surgeries-gaze-based-indices
#7
Leandro L Di Stasi, Carolina Díaz-Piedra, Juan Francisco Ruiz-Rabelo, Héctor Rieiro, Jose M Sanchez Carrion, Andrés Catena
BACKGROUND: Despite the growing interest concerning the laparo-endoscopic single-site surgery (LESS) procedure, LESS presents multiple difficulties and challenges that are likely to increase the surgeon's cognitive cost, in terms of both cognitive load and performance. Nevertheless, there is currently no objective index capable of assessing the surgeon cognitive cost while performing LESS. We assessed if gaze-based indices might offer unique and unbiased measures to quantify LESS complexity and its cognitive cost...
November 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28798674/adaptive-gaze-strategies-for-locomotion-with-constricted-visual-field
#8
Colas N Authié, Alain Berthoz, José-Alain Sahel, Avinoam B Safran
In retinitis pigmentosa (RP), loss of peripheral visual field accounts for most difficulties encountered in visuo-motor coordination during locomotion. The purpose of this study was to accurately assess the impact of peripheral visual field loss on gaze strategies during locomotion, and identify compensatory mechanisms. Nine RP subjects presenting a central visual field limited to 10-25° in diameter, and nine healthy subjects were asked to walk in one of three directions-straight ahead to a visual target, leftward and rightward through a door frame, with or without obstacle on the way...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28790910/hybrid-brain-computer-interface-techniques-for-improved-classification-accuracy-and-increased-number-of-commands-a-review
#9
REVIEW
Keum-Shik Hong, Muhammad Jawad Khan
In this article, non-invasive hybrid brain-computer interface (hBCI) technologies for improving classification accuracy and increasing the number of commands are reviewed. Hybridization combining more than two modalities is a new trend in brain imaging and prosthesis control. Electroencephalography (EEG), due to its easy use and fast temporal resolution, is most widely utilized in combination with other brain/non-brain signal acquisition modalities, for instance, functional near infrared spectroscopy (fNIRS), electromyography (EMG), electrooculography (EOG), and eye tracker...
2017: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/28777822/quantifying-gaze-and-mouse-interactions-on-spatial-visual-interfaces-with-a-new-movement-analytics-methodology
#10
Urška Demšar, Arzu Çöltekin
Eye movements provide insights into what people pay attention to, and therefore are commonly included in a variety of human-computer interaction studies. Eye movement recording devices (eye trackers) produce gaze trajectories, that is, sequences of gaze location on the screen. Despite recent technological developments that enabled more affordable hardware, gaze data are still costly and time consuming to collect, therefore some propose using mouse movements instead. These are easy to collect automatically and on a large scale...
2017: PloS One
https://www.readbyqxmd.com/read/28767546/a-pilot-study-of-horizontal-head-and-eye-rotations-in-baseball-batting
#11
Nick Fogt, Tyler W Persson
PURPOSE: The purpose of the study was to measure and compare horizontal head and eye tracking movements as baseball batters "took" pitches and swung at baseball pitches. METHODS: Two former college baseball players were tested in two conditions. A pitching machine was used to project tennis balls toward the subjects. In the first condition, subjects acted as if they were taking (i.e., not swinging) the pitches. In the second condition, subjects attempted to bat the pitched balls...
August 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28765146/reliability-of-cyclotorsion-measurements-using-scanning-laser-ophthalmoscopy-imaging-in-healthy-subjects-the-cyslo-study
#12
Fabian Lengwiler, Daniel Rappoport, Gregor P Jaggi, Klara Landau, Ghislaine L Traber
BACKGROUND/AIMS: To evaluate inter-rater and intra-rater reliability of objective cyclotorsion measurements obtained in healthy subjects using the Heidelberg Spectralis spectral domain-optical coherence tomography (SD-OCT) device. METHODS: In this prospective methodological study, 32 healthy subjects (14 men, 18 women; aged 21-64 years) were enrolled, 31 right eyes were examined and their foveo-papillary angles (FPAs) were measured. The retinal nerve fibre layer (RNFL) programme by Heidelberg Spectralis (Heidelberg Engineering, Heidelberg, Germany) was used to measure cyclotorsion based on the in-built algorithm for the measurement of the FPA on the scanning laser ophthalmoscopy (SLO) image...
August 1, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28750903/computing-eye-gaze-metrics-for-the-automatic-assessment-of-radiographer-performance-during-x-ray-image-interpretation
#13
Laura McLaughlin, Raymond Bond, Ciara Hughes, Jonathan McConnell, Sonyia McFadden
AIM: To investigate image interpretation performance by diagnostic radiography students, diagnostic radiographers and reporting radiographers by computing eye gaze metrics using eye tracking technology. METHODS: Three groups of participants were studied during their interpretation of 8 digital radiographic images including the axial and appendicular skeleton, and chest (prevalence of normal images was 12.5%). A total of 464 image interpretations were collected. Participants consisted of 21 radiography students, 19 qualified radiographers and 18 qualified reporting radiographers who were further qualified to report on the musculoskeletal (MSK) system...
September 2017: International Journal of Medical Informatics
https://www.readbyqxmd.com/read/28729927/fatigue-and-cognition-pupillary-responses-to-problem-solving-in-early-multiple-sclerosis-patients
#14
Sigrid A de Rodez Benavent, Gro O Nygaard, Hanne F Harbo, Siren Tønnesen, Piotr Sowa, Nils I Landrø, Marte Wendel-Haga, Lars Etholm, Kristian B Nilsen, Liv Drolsum, Emilia Kerty, Elisabeth G Celius, Bruno Laeng
INTRODUCTION: In early multiple sclerosis (MS) patients, cognitive changes and fatigue are frequent and troublesome symptoms, probably related to both structural and functional brain changes. Whether there is a common cause of these symptoms in MS is unknown. In theory, an altered regulation of central neuropeptides can lead to changes in regulation of autonomic function, cognitive difficulties, and fatigue. Direct measurements of central neuropeptides are difficult to perform, but measurements of the eye pupil can be used as a reliable proxy of function...
July 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28713234/leftward-deviation-and-asymmetric-speed-of-egocentric-judgment-between-left-and-right-visual-fields
#15
Ying Zhou, Bing Li, Gang Wang, Mingsha Zhang, Yujun Pan
The egocentric reference frame is essential for body orientation and spatial localization of external objects. Recent neuroimaging and lesion studies have revealed that the right hemisphere of humans may play a more dominant role in processing egocentric information than the left hemisphere. However, previous studies of egocentric discrimination mainly focused on assessing the accuracy of egocentric judgment, leaving its timing unexplored. In addition, most previous studies never monitored the subjects' eye position during the experiments, so the influence of eye position on egocentric judgment could not be excluded...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28712014/do-you-see-what-i-see-mobile-eye-tracker-contextual-analysis-and-inter-rater-reliability
#16
S Stuart, D Hunt, J Nell, A Godfrey, J M Hausdorff, L Rochester, L Alcock
Mobile eye-trackers are currently used during real-world tasks (e.g. gait) to monitor visual and cognitive processes, particularly in ageing and Parkinson's disease (PD). However, contextual analysis involving fixation locations during such tasks is rarely performed due to its complexity. This study adapted a validated algorithm and developed a classification method to semi-automate contextual analysis of mobile eye-tracking data. We further assessed inter-rater reliability of the proposed classification method...
July 15, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28701915/web-camera-based-eye-tracking-to-assess-visual-memory-on-a-visual-paired-comparison-task
#17
Nicholas T Bott, Alex Lange, Dorene Rentz, Elizabeth Buffalo, Paul Clopton, Stuart Zola
Background: Web cameras are increasingly part of the standard hardware of most smart devices. Eye movements can often provide a noninvasive "window on the brain," and the recording of eye movements using web cameras is a burgeoning area of research. Objective: This study investigated a novel methodology for administering a visual paired comparison (VPC) decisional task using a web camera.To further assess this method, we examined the correlation between a standard eye-tracking camera automated scoring procedure [obtaining images at 60 frames per second (FPS)] and a manually scored procedure using a built-in laptop web camera (obtaining images at 3 FPS)...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28695765/the-redundancy-effect-in-human-causal-learning-no-evidence-for-changes-in-selective-attention
#18
Peter M Jones, Tara Zaksaite
Several recent papers (e.g. Uengoer, Lotz, & Pearce, 2013) have reported a difference in associative learning for two kinds of redundant cues, such that a blocked cue (e.g. X in A+ AX+) apparently forms a stronger association with the outcome than an uncorrelated cue (e.g. Y in BY+ CY-). This difference is referred to as the redundancy effect, and is of interest because it is contrary to the predictions of a number of popular learning models. One way of reconciling these models with the redundancy effect is to assume that the amount of attention paid to redundant cues changes as a result of experience, and that these changes in attention influence subsequent learning...
July 11, 2017: Quarterly Journal of Experimental Psychology: QJEP
https://www.readbyqxmd.com/read/28690585/saccadic-impairments-in-patients-with-the-norrbottnian-form-of-gaucher-s-disease-type-3
#19
Josefine Blume, Stanislav Beniaminov, Cecilia Kämpe Björkvall, Maciej Machaczka, Per Svenningsson
BACKGROUND: Chronic neuronopathic Gaucher's disease type 3 (GD3) is relatively frequent in northern Sweden. Besides multiple other neurological symptoms, horizontal gaze palsy or oculomotor apraxia is common in GD3. OBJECTIVE: To characterize the saccades in patients with Norrbottnian GD3 with respect to their neurological and cognitive status using a computer-based eye-tracking technique. METHODS: Horizontal and vertical reflexive saccades as well as antisaccades of nine GD3 patients [4M/5F; 41...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28685104/the-reliability-validity-and-normative-data-of-interpupillary-distance-and-pupil-diameter-using-eye-tracking-technology
#20
Nicholas P Murray, Melissa Hunfalvay, Takumi Bolte
PURPOSE: The purpose of this study was to determine the reliability of interpupillary distance (IPD) and pupil diameter (PD) measures using an infrared eye tracker and central point stimuli. Validity of the test compared to known clinical tools was determined, and normative data was established against which individuals can measure themselves. METHODS: Participants (416) across various demographics were examined for normative data. Of these, 50 were examined for reliability and validity...
July 2017: Translational Vision Science & Technology
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