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https://www.readbyqxmd.com/read/28412603/impairments-of-balance-stepping-reactions-and-gait-in-people-with-cervical-dystonia
#1
Christopher Barr, Rhiannon Barnard, Lauren Edwards, Sheila Lennon, Lynley Bradnam
BACKGROUND: Impaired balance is common in neurological disorders. Cervical dystonia is a neurological movement disorder affecting the neck. The effect of this aberrant head posture on physical function is unknown. OBJECTIVES: To compare balance, mobility, gait and stepping reactions between ten people with cervical dystonia and ten control adults. METHODS: Spatiotemporal gait parameters and walking speed were assessed using a computerised walkway...
April 4, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28411734/hri-usability-evaluation-of-interaction-modes-for-a-teleoperated-agricultural-robotic-sprayer
#2
George Adamides, Christos Katsanos, Yisrael Parmet, Georgios Christou, Michalis Xenos, Thanasis Hadzilacos, Yael Edan
Teleoperation of an agricultural robotic system requires effective and efficient human-robot interaction. This paper investigates the usability of different interaction modes for agricultural robot teleoperation. Specifically, we examined the overall influence of two types of output devices (PC screen, head mounted display), two types of peripheral vision support mechanisms (single view, multiple views), and two types of control input devices (PC keyboard, PS3 gamepad) on observed and perceived usability of a teleoperated agricultural sprayer...
July 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28410476/fear-reactivity-to-cognitive-dyscontrol-via-novel-head-mounted-display-perceptual-illusion-exercises
#3
Daniel W Capron, Aaron M Norr, Brian J Albanese, Norman B Schmidt
BACKGROUND: Anxiety sensitivity cognitive concerns (ASCC), refer to fears of mental catastrophe or losing control over mental processes. Recent findings show that ASCC are related to suicide risk, mood disorders and trauma-related disorders. Using controlled experimental psychopathology paradigms could be one heretofore unutilized method of increasing understanding of ASCC. Our goal was to test fear reactivity to four head-mounted display perceptual illusion challenges designed to bring on feelings of cognitive dyscontrol (i...
April 7, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28387689/multisensory-control-of-a-straight-locomotor-trajectory
#4
Maxim Hanna, Joyce Fung, Anouk Lamontagne
Locomotor steering is contingent upon orienting oneself spatially in the environment. When the head is turned while walking, the optic flow projected onto the retina is a complex pattern comprising of a translational and a rotational component. We have created a unique paradigm to simulate different optic flows in a virtual environment. We hypothesized that non-visual (vestibular and somatosensory) cues are required for proper control of a straight trajectory while walking. This research study included 9 healthy young subjects walking in a large physical space (40×25m2) while the virtual environment is viewed in a helmet-mounted display...
2017: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/28380953/compact-see-through-3d-head-mounted-display-based-on-wavefront-modulation-with-holographic-grating-filter
#5
Qiankun Gao, Juan Liu, Xinhui Duan, Tao Zhao, Xin Li, Peilin Liu
A compact see-through three-dimensional head-mounted display (3D-HMD) is proposed and investigated in this paper. Two phase holograms are analytically extracted from the object wavefront and uploaded on different zones of the spatial light modulator (SLM). A holographic grating is further used as the frequency filter to couple the separated holograms together for wavefront modulation. The developed preliminary prototype has a simple optical facility and a compact structure (133.8mm × 40.4mm × 35.4mm with a 47...
April 3, 2017: Optics Express
https://www.readbyqxmd.com/read/28378077/new-dimensions-in-surgical-training-immersive-virtual-reality-laparoscopic-simulation-exhilarates-surgical-staff
#6
Tobias Huber, Markus Paschold, Christian Hansen, Tom Wunderling, Hauke Lang, Werner Kneist
INTRODUCTION: Virtual reality (VR) and head mount displays (HMDs) have been advanced for multimedia and information technologies but have scarcely been used in surgical training. Motion sickness and individual psychological changes have been associated with VR. The goal was to observe first experiences and performance scores using a new combined highly immersive virtual reality (IVR) laparoscopy setup. METHODS: During the study, 10 members of the surgical department performed three tasks (fine dissection, peg transfer, and cholecystectomy) on a VR simulator...
April 4, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28352241/the-sense-of-1pp-location-contributes-to-shaping-the-perceived-self-location-together-with-the-sense-of-body-location
#7
Hsu-Chia Huang, Yen-Tung Lee, Wen-Yeo Chen, Caleb Liang
Self-location-the sense of where I am in space-provides an experiential anchor for one's interaction with the environment. In the studies of full-body illusions, many researchers have defined self-location solely in terms of body-location-the subjective feeling of where my body is. Although this view is useful, there is an issue regarding whether it can fully accommodate the role of 1PP-location-the sense of where my first-person perspective is located in space. In this study, we investigate self-location by comparing body-location and 1PP-location: using a head-mounted display (HMD) and a stereo camera, the subjects watched their own body standing in front of them and received tactile stimulations...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28343301/comparison-of-optical-see-through-head-mounted-displays-for-surgical-interventions-with-object-anchored-2d-display
#8
Long Qian, Alexander Barthel, Alex Johnson, Greg Osgood, Peter Kazanzides, Nassir Navab, Bernhard Fuerst
PURPOSE: Optical see-through head-mounted displays (OST-HMD) feature an unhindered and instantaneous view of the surgery site and can enable a mixed reality experience for surgeons during procedures. In this paper, we present a systematic approach to identify the criteria for evaluation of OST-HMD technologies for specific clinical scenarios, which benefit from using an object-anchored 2D-display visualizing medical information. METHODS: Criteria for evaluating the performance of OST-HMDs for visualization of medical information and its usage are identified and proposed...
March 25, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28326654/the-development-of-bodily-self-consciousness-changing-responses-to-the-full-body-illusion-in-childhood
#9
Dorothy Cowie, Aisling McKenna, Andrew J Bremner, Jane E Aspell
The present work investigates the development of bodily self-consciousness and its relation to multisensory bodily information, by measuring for the first time the development of responses to the full body illusion in childhood. We tested three age groups of children: 6- to 7-year-olds (n = 28); 8- to 9-year-olds (n = 21); 10- to 11-year-olds (n = 19), and a group of adults (n = 31). Each participant wore a head-mounted display (HMD) which displayed a view from a video camera positioned 2 metres behind their own back...
March 22, 2017: Developmental Science
https://www.readbyqxmd.com/read/28323840/htc-vive-mevislab-integration-via-openvr-for-medical-applications
#10
Jan Egger, Markus Gall, Jürgen Wallner, Pedro Boechat, Alexander Hann, Xing Li, Xiaojun Chen, Dieter Schmalstieg
Virtual Reality, an immersive technology that replicates an environment via computer-simulated reality, gets a lot of attention in the entertainment industry. However, VR has also great potential in other areas, like the medical domain, Examples are intervention planning, training and simulation. This is especially of use in medical operations, where an aesthetic outcome is important, like for facial surgeries. Alas, importing medical data into Virtual Reality devices is not necessarily trivial, in particular, when a direct connection to a proprietary application is desired...
2017: PloS One
https://www.readbyqxmd.com/read/28318502/efficacy-of-virtual-reality-in-pedestrian-safety-research
#11
Shuchisnigdha Deb, Daniel W Carruth, Richard Sween, Lesley Strawderman, Teena M Garrison
Advances in virtual reality technology present new opportunities for human factors research in areas that are dangerous, difficult, or expensive to study in the real world. The authors developed a new pedestrian simulator using the HTC Vive head mounted display and Unity software. Pedestrian head position and orientation were tracked as participants attempted to safely cross a virtual signalized intersection (5.5 m). In 10% of 60 trials, a vehicle violated the traffic signal and in 10.84% of these trials, a collision between the vehicle and the pedestrian was observed...
March 16, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28280896/surgeon-manipulated-live-surgery-video-recording-apparatuses-personal-experience-and-review-of-literature
#12
REVIEW
Emin Kapi
BACKGROUND: Visual recording of surgical procedures is a method that is used quite frequently in practices of plastic surgery. While presentations containing photographs are quite common in education seminars and congresses, video-containing presentations find more favour. For this reason, the presentation of surgical procedures in the form of real-time video display has increased especially recently. Appropriate technical equipment for video recording is not available in most hospitals, so there is a need to set up external apparatus in the operating room...
March 9, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/28275346/manipulating-bodily-presence-affects-cross-modal-spatial-attention-a-virtual-reality-based-erp-study
#13
Ville J Harjunen, Imtiaj Ahmed, Giulio Jacucci, Niklas Ravaja, Michiel M Spapé
Earlier studies have revealed cross-modal visuo-tactile interactions in endogenous spatial attention. The current research used event-related potentials (ERPs) and virtual reality (VR) to identify how the visual cues of the perceiver's body affect visuo-tactile interaction in endogenous spatial attention and at what point in time the effect takes place. A bimodal oddball task with lateralized tactile and visual stimuli was presented in two VR conditions, one with and one without visible hands, and one VR-free control with hands in view...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28271221/control-of-vertical-posture-while-elevating-one-foot-to-avoid-a-real-or-virtual-obstacle
#14
Hirofumi Ida, Sambit Mohapatra, Alexander Aruin
The purpose of this study is to investigate the control of vertical posture during obstacle avoidance in a real versus a virtual reality (VR) environment. Ten healthy participants stood upright and lifted one leg to avoid colliding with a real obstacle sliding on the floor toward a participant and with its virtual image. Virtual obstacles were delivered by a head mounted display (HMD) or a 3D projector. The acceleration of the foot, center of pressure, and electrical activity of the leg and trunk muscles were measured and analyzed during the time intervals typical for early postural adjustments (EPAs), anticipatory postural adjustments (APAs), and compensatory postural adjustments (CPAs)...
March 7, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28265145/inclination-of-standing-posture-due-to-the-presentation-of-tilted-view-through-an-immersive-head-mounted-display
#15
Yuji Ohmura, Shiro Yano, Junji Katsuhira, Masato Migita, Arito Yozu, Toshiyuki Kondo
[Purpose] The purpose of the present study is to clarify whether tilted scenery presented through an immersive head-mounted display (HMD) causes the inclination of standing posture. [Subjects and Methods] Eleven healthy young adult males who provided informed consent participated in the experiment. An immersive HMD and a stereo camera were employed to develop a visual inclination system. The subjects maintained a standing posture twice for 5s each while wearing the visual inclination system. They performed this task under two conditions: normal view and 20° leftward tilted view...
February 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28222783/walking-in-fully-immersive-virtual-environments-an-evaluation-of-potential-adverse-effects-in-older-adults-and-individuals-with-parkinson-s-disease
#16
Aram Kim, Nora Darakjian, James M Finley
BACKGROUND: Virtual reality (VR) has recently been explored as a tool for neurorehabilitation to enable individuals with Parkinson's disease (PD) to practice challenging skills in a safe environment. Current technological advances have enabled the use of affordable, fully immersive head-mounted displays (HMDs) for potential therapeutic applications. However, while previous studies have used HMDs in individuals with PD, these were only used for short bouts of walking. Clinical applications of VR for gait training would likely involve an extended exposure to the virtual environment, which has the potential to cause individuals with PD to experience simulator-related adverse effects due to their age or pathology...
February 21, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28222235/visual-appearance-of-a-virtual-upper-limb-modulates-the-temperature-of-the-real-hand-a-thermal-imaging-study-in-immersive-virtual-reality
#17
G Tieri, A Gioia, M Scandola, E F Pavone, S M Aglioti
To explore the link between Sense of Embodiment (SoE) over a virtual hand and physiological regulation of skin temperature, twenty-four healthy participants were immersed in virtual reality through a Head Mounted Display and had their real limb temperature recorded by means of a high-sensitivity infrared camera. Participants observed a virtual right upper limb (appearing either normally, or with the hand detached from the forearm) or limb-shaped non-corporeal control objects (continuous or discontinuous wooden blocks) from a first-person perspective...
February 21, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28158092/alternate-optical-designs-for-head-mounted-displays-with-a-wide-field-of-view
#18
Bo Chen, Alois M Herkommer
The most widely applied design form for mixed reality head-mounted display (HMD) systems is generally a prism with one surface in total internal reflection (TIR). This, however, limits the angle of the incident rays, and thus decreases the design freedom and affects the performance. To obtain better performance of the HMD optics, in this paper two seldom used design forms of HMD systems are presented and compared to the standard TIR HMD optics. One of them is a catadioptric HMD system, consisting of one lens and two mirrors; the other is a prism HMD with a different folding geometry...
February 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28129181/augmented-reality-vs-virtual-reality-for-3d-object-manipulation
#19
Max Krichenbauer, Goshiro Yamamoto, Takafumi Taketomi, Christian Sandor, Hirokazu Kato
Virtual Reality (VR) Head-Mounted Displays (HMDs) are on the verge of becoming commodity hardware available to the average user and feasible to use as a tool for 3D work. Some HMDs include front-facing cameras, enabling Augmented Reality (AR) functionality. Apart from avoiding collisions with the environment, interaction with virtual objects may also be affected by seeing the real environment. However, whether these effects are positive or negative has not yet been studied extensively. For most tasks it is unknown whether AR has any advantage over VR...
January 25, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28129175/designing-a-vibrotactile-head-mounted-display
#20
Victor de Jesus Oliveira, Luca Brayda, Luciana Nedel, Anderson Maciel
Due to the perceptual characteristics of the head, vibrotactile Head-mounted Displays are built with low actuator density. Therefore, vibrotactile guidance is mostly assessed by pointing towards objects in the azimuthal plane. When it comes to multisensory interaction in 3D environments, it is also important to convey information about objects in the elevation plane. In this paper, we design and assess a haptic guidance technique for 3D environments. First, we explore the modulation of vibration frequency to indicate the position of objects in the elevation plane...
January 23, 2017: IEEE Transactions on Visualization and Computer Graphics
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