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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/28813567/comparison-of-view-based-and-reconstruction-based-models-of-human-navigational-strategy
#2
Luise Gootjes-Dreesbach, Lyndsey C Pickup, Andrew W Fitzgibbon, Andrew Glennerster
There is good evidence that simple animals, such as bees, use view-based strategies to return to a familiar location, whereas humans might use a 3-D reconstruction to achieve the same goal. Assuming some noise in the storage and retrieval process, these two types of strategy give rise to different patterns of predicted errors in homing. We describe an experiment that can help distinguish between these models. Participants wore a head-mounted display to carry out a homing task in immersive virtual reality. They viewed three long, thin, vertical poles and had to remember where they were in relation to the poles before being transported (virtually) to a new location in the scene from where they had to walk back to the original location...
August 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28809700/cognitive-cost-of-using-augmented-reality-displays
#3
James Baumeister, Seung Youb Ssin, Neven A M ElSayed, Jillian Dorrian, David P Webb, James A Walsh, Timothy M Simon, Andrew Irlitti, Ross T Smith, Mark Kohler, Bruce H Thomas
This paper presents the results of two cognitive load studies comparing three augmented reality display technologies: spatial augmented reality, the optical see-through Microsoft HoloLens, and the video see-through Samsung Gear VR. In particular, the two experiments focused on isolating the cognitive load cost of receiving instructions for a button-pressing procedural task. The studies employed a self-assessment cognitive load methodology, as well as an additional dual-task cognitive load methodology. The results showed that spatial augmented reality led to increased performance and reduced cognitive load...
August 10, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28809690/occlusion-leak-compensation-for-optical-see-through-displays-using-a-single-layer-transmissive-spatial-light-modulator
#4
Yuta Itoh, Takumi Hamasaki, Maki Sugimoto
We propose an occlusion compensation method for optical see-through head-mounted displays (OST-HMDs) equipped with a singlelayer transmissive spatial light modulator (SLM), in particular, a liquid crystal display (LCD). Occlusion is an important depth cue for 3D perception, yet realizing it on OST-HMDs is particularly difficult due to the displays' semitransparent nature. A key component for the occlusion support is the SLM-a device that can selectively interfere with light rays passing through it. For example, an LCD is a transmissive SLM that can block or pass incoming light rays by turning pixels black or transparent...
August 10, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28809183/helping-hands-using-augmented-reality-to-provide-remote-guidance-to-health-professionals
#5
Carey Mather, Tony Barnett, Vlasti Broucek, Annette Saunders, Darren Grattidge, Weidong Huang
Access to expert practitioners or geographic distance can compound the capacity for appropriate supervision of health professionals in the workplace. Guidance and support of clinicians and students to undertake new or infrequent procedures can be resource intensive. The Helping Hands remote augmented reality system is an innovation to support the development of, and oversee the acquisition of procedural skills through remote learning and teaching supervision while in clinical practice. Helping Hands is a wearable, portable, hands-free, low cost system comprised of two networked laptops, a head-mounted display worn by the recipient and a display screen used remotely by the instructor...
2017: Studies in Health Technology and Informatics
https://www.readbyqxmd.com/read/28804731/eye-tracking-in-catheter-based-cardiovascular-interventions-early-results
#6
Peter Lanzer, Mohammad Al-Naser, Syed Saqib Bukhari, Andreas Dengel, Elizabeth A Krupinski
Visual x-ray image processing (XRIP) represents a fundamental component of catheter-based cardiovascular interventions (CBCVIs). To date, no data are available to define XRIP in this setting. To characterize CBCVI XRIP, we developed a computer-based method allowing continuous temporal-spatial analysis of data recorded by a head-mounted eye-tracking device. Quantitative analysis of gaze duration of an expert operator (EO) revealed that the average time in minutes spent viewing the images on the display screen was [Formula: see text] and [Formula: see text] of the total recorded time in coronary angiography (CA) and in CA followed by CBCVI, respectively...
July 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28759983/validation-of-ct-image-based-software-for-three-dimensional-measurement-of-acetabular-coverage-profile
#7
Marcus P Wenzl, Markus Heller, Viktor Janz, Carsten Perka, Georgi I Wassilew
BACKGROUND: Plain radiography, 2-dimensional (2D) magnetic resonance imaging (MRI), and computed tomography (CT) do not precisely display morphology and acetabular coverage in developmental dysplasia of the hip or pincer-type femoroacetabular impingement. Pelvic position and pelvic tilt affect assessment of the acetabular parameters, leading to misinterpretation. OBJECTIVE: We tested a 3-dimensional (3D) CT evaluation script to calculate the crossover sign (COS), acetabular coverage and morphology...
July 21, 2017: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
https://www.readbyqxmd.com/read/28754068/a-new-head-mounted-display-based-augmented-reality-system-in-neurosurgical-oncology-a-study-on-phantom
#8
Fabrizio Cutolo, Antonio Meola, Marina Carbone, Sara Sinceri, Federico Cagnazzo, Ennio Denaro, Nicola Esposito, Mauro Ferrari, Vincenzo Ferrari
PURPOSE: Benefits of minimally invasive neurosurgery mandate the development of ergonomic paradigms for neuronavigation. Augmented Reality (AR) systems can overcome the shortcomings of commercial neuronavigators. The aim of this work is to apply a novel AR system, based on a head-mounted stereoscopic video see-through display, as an aid in complex neurological lesion targeting. Effectiveness was investigated on a newly designed patient-specific head mannequin featuring an anatomically realistic brain phantom with embedded synthetically created tumors and eloquent areas...
December 2017: Computer Assisted Surgery (Abingdon, England)
https://www.readbyqxmd.com/read/28751536/defective-sperm-head-decondensation-undermines-the-success-of-icsi-in-the-bovine
#9
Luis Águila, Ricardo Felmer, María Elena Arias, Felipe Navarrete, David Martin-Hidalgo, Hoi Chang Lee, Pablo Visconti, Rafael Fissore
The efficiency of intracytoplasmic sperm injection (ICSI) in the bovine is low compared to other species. It is unknown whether defective oocyte activation and/or sperm head decondensation limit the success of this technique in this species. To elucidate where the main obstacle lies, we used homologous and heterologous ICSI and parthenogenetic activation procedures. We also evaluated whether in vitro maturation negatively impacted the early stages of activation after ICSI. Here we showed that injected bovine sperm are resistant to nuclear decondensation by bovine oocytes and this is only partly overcome by exogenous activation...
September 2017: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/28751302/smartphone-based-endoscope-system-for-advanced-point-of-care-diagnostics-feasibility-study
#10
Jung Kweon Bae, Andrey Vavilin, Joon S You, Hyeongeun Kim, Seon Young Ryu, Jeong Hun Jang, Woonggyu Jung
BACKGROUND: Endoscopic technique is often applied for the diagnosis of diseases affecting internal organs and image-guidance of surgical procedures. Although the endoscope has become an indispensable tool in the clinic, its utility has been limited to medical offices or operating rooms because of the large size of its ancillary devices. In addition, the basic design and imaging capability of the system have remained relatively unchanged for decades. OBJECTIVE: The objective of this study was to develop a smartphone-based endoscope system capable of advanced endoscopic functionalities in a compact size and at an affordable cost and to demonstrate its feasibility of point-of-care through human subject imaging...
July 27, 2017: JMIR MHealth and UHealth
https://www.readbyqxmd.com/read/28719062/immersive-virtual-reality-as-a-teaching-tool-for-neuroanatomy
#11
Katelyn Stepan, Joshua Zeiger, Stephanie Hanchuk, Anthony Del Signore, Raj Shrivastava, Satish Govindaraj, Alfred Iloreta
BACKGROUND: Three-dimensional (3D) computer modeling and interactive virtual reality (VR) simulation are validated teaching techniques used throughout medical disciplines. Little objective data exists supporting its use in teaching clinical anatomy. Learner motivation is thought to limit the rate of utilization of such novel technologies. The purpose of this study is to evaluate the effectiveness, satisfaction, and motivation associated with immersive VR simulation in teaching medical students neuroanatomy...
July 18, 2017: International Forum of Allergy & Rhinology
https://www.readbyqxmd.com/read/28701101/validation-of-an-immersive-virtual-reality-system-for-training-near-and-far-space-neglect-in-individuals-with-stroke-a-pilot-study
#12
Kazuhiro Yasuda, Daisuke Muroi, Masahiro Ohira, Hiroyasu Iwata
BACKGROUND: Unilateral spatial neglect (USN) is defined as impaired ability to attend and see on one side, and when present, it interferes seriously with daily life. These symptoms can exist for near and far spaces combined or independently, and it is important to provide effective intervention for near and far space neglect. OBJECTIVE: The purpose of this pilot study was to propose an immersive virtual reality (VR) rehabilitation program using a head-mounted display that is able to train both near and far space neglect, and to validate the immediate effect of the VR program in both near and far space neglect...
July 12, 2017: Topics in Stroke Rehabilitation
https://www.readbyqxmd.com/read/28662416/a-multi-tiered-in-vivo-quantitative-assay-suite-for-environmental-disruptors-of-thyroid-hormone-signaling
#13
Brenda J Mengeling, Yuzhu Wei, Lucia N Dobrawa, Mischa Streekstra, Jochem Louisse, Vikrant Singh, Latika Singh, Pamela J Lein, Heike Wulff, Albertinka J Murk, J David Furlow
The essential role of thyroid hormone (TH) signaling in mammalian development warrants the examination of man-made chemicals for its disruption. Among vertebrate species, the molecular components of TH signaling are highly conserved, including the thyroid hormone receptors (TRs), their heterodimer binding partners the retinoid-X receptors (RXRs), and their DNA recognition sequences (TREs). This molecular conservation allows examination of potential TH disruption in the tractable, in vivo model system of amphibian metamorphosis...
September 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28660325/-i-will-do-laparoscopy-somewhere-else-total-highly-immersive-virtual-reality-without-side-effects
#14
T Huber, M Paschold, C Hansen, H Lang, W Kneist
BACKGROUND: For virtual reality laparosopic simulation we developed a new, highly immersive simulation mode. The goal of the current pilot study was to investigate if kinetosis or other negative vegetative side effects can be caused by a total virtual training set-up (TVRL). METHODS: In this study 20 participants with varying degrees of expertise in laparoscopy performed 3 tasks (i.e. ring exchange, fine dissection and cholecystectomy) in regular (VRL) and immersive mode (TVRL) with a head-mounted display (HMD) on a laparoscopic simulator...
June 28, 2017: Der Chirurg; Zeitschrift Für Alle Gebiete der Operativen Medizen
https://www.readbyqxmd.com/read/28659140/amblyopia-treatment-of-adults-with-dichoptic-training-using-the-virtual-reality-oculus-rift-head-mounted-display-preliminary-results
#15
Peter Žiak, Anders Holm, Juraj Halička, Peter Mojžiš, David P Piñero
BACKGROUND: The gold standard treatments in amblyopia are penalizing therapies, such as patching or blurring vision with atropine that are aimed at forcing the use of the amblyopic eye. However, in the last years, new therapies are being developed and validated, such as dichoptic visual training, aimed at stimulating the amblyopic eye and eliminating the interocular supression. PURPOSE: To evaluate the effect of dichoptic visual training using a virtual reality head mounted display in a sample of anisometropic amblyopic adults and to evaluate the potential usefulness of this option of treatment...
June 28, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28641686/a-case-study-of-human-roll-tilt-perception-in-hypogravity
#16
Torin K Clark, Laurence R Young
BACKGROUND: Increased gravito-inertial acceleration, or hypergravity, such as produced in a centrifuge or in an aircraft coordinated turn, causes humans to systematically overestimate their roll tilt in the dark. This is known as the "G-excess" illusion. We have previously modified a mathematical observer model of dynamic orientation perception to replicate these illusory tilt perceptions. This modified model also made a novel, previously untested, prediction that humans would underestimate acute roll tilt in reduced gravitational environments (hypogravity)...
July 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28588520/emotional-expression-in-simple-line-drawings-of-a-robot-s-face-leads-to-higher-offers-in-the-ultimatum-game
#17
Kazunori Terada, Chikara Takeuchi
In the present study, we investigated whether expressing emotional states using a simple line drawing to represent a robot's face can serve to elicit altruistic behavior from humans. An experimental investigation was conducted in which human participants interacted with a humanoid robot whose facial expression was shown on an LCD monitor that was mounted as its head (Study 1). Participants were asked to play the ultimatum game, which is usually used to measure human altruistic behavior. All participants were assigned to be the proposer and were instructed to decide their offer within 1 min by controlling a slider bar...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28585674/real-time-video-streaming-to-surgical-loupe-mounted-head-up-display-for-navigated-meningioma-resection
#18
Roberto Diaz, Jang Yoon, Robert Chen, Alfredo Quinones-Hinojosa, Robert Wharen, Ricardo Komotar
AIM: Wearable technology interfaces with normal human movement and function, thereby enabling more efficient and adaptable use.We developed a wearable display system for use with intra-operative neuronavigation for brain tumor surgery. MATERIAL AND METHODS: The Google glass head-up display system was adapted to surgical loupes with a video-streaming integrated hardware and software device for display of the Stealth S7 navigation screen. Phantom trials of surface ventriculostomy were performed...
April 30, 2017: Turkish Neurosurgery
https://www.readbyqxmd.com/read/28584247/see-through-optical-combiner-for-augmented-reality-head-mounted-display-index-matched-anisotropic-crystal-lens
#19
Jong-Young Hong, Chang-Kun Lee, Seungjae Lee, Byounghyo Lee, Dongheon Yoo, Changwon Jang, Jonghyun Kim, Jinsoo Jeong, Byoungho Lee
A novel see-through optical device to combine the real world and the virtual image is proposed which is called an index-matched anisotropic crystal lens (IMACL). The convex lens made of anisotropic crystal is enveloped with the isotropic material having same refractive index with the extraordinary refractive index of the anisotropic crystal. This optical device functions as the transparent glass or lens according to the polarization state of the incident light. With the novel optical property, IMACL can be utilized in the see-through near eye display, or head-mounted display for augmented reality...
June 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28573091/virtual-reality-and-augmented-reality-in-plastic-surgery-a-review
#20
REVIEW
Youngjun Kim, Hannah Kim, Yong Oock Kim
Recently, virtual reality (VR) and augmented reality (AR) have received increasing attention, with the development of VR/AR devices such as head-mounted displays, haptic devices, and AR glasses. Medicine is considered to be one of the most effective applications of VR/AR. In this article, we describe a systematic literature review conducted to investigate the state-of-the-art VR/AR technology relevant to plastic surgery. The 35 studies that were ultimately selected were categorized into 3 representative topics: VR/AR-based preoperative planning, navigation, and training...
May 2017: Archives of Plastic Surgery
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