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Nicola Liberati
The aim of this paper is to analyse teledildonics from a phenomenological perspective in order to show the possible effects they will have on ourselves and on our society. The new way of using digital technologies is to merge digital activities with our everyday praxes, and there are already devices which enable subjects to be digitally connected in every moment of their lives. Even the most intimate ones are becoming mediated by devices such as teledildonics which digitally provide a tactual stimulation allowing users to have sexual intercourse through them...
October 18, 2016: Science and Engineering Ethics
Dafni Krystallidou, Peter Thompson
Visual input powerfully modulates the dynamics of tactile orientation perception. This study investigated the transfer of the tilt aftereffect (TAE) from vision to somatosensation. In a visual tilt adaptation paradigm, participants were exposed to clockwise or anticlockwise visual tilt, followed by three brief tactile two-point stimuli delivered on their forehead. In a two-alternative forced choice task, participants had to indicate whether the haptic stimulus was tilted to the right or left. Repeated exposure to oriented visual gratings produced a tactile TAE, such that the subsequent tactile stimuli appeared tilted toward the opposite direction...
September 2016: I-Perception
Rebecca Lawson, Henna Ajvani, Stefano Cecchetto
Detection of regularities (e.g., symmetry, repetition) can be used to investigate object and shape perception. Symmetry and nearby lines may both signal that one object is present, so moving lines apart may disrupt symmetry detection, while repetition may signal that multiple objects are present. Participants discriminated symmetrical/irregular and repeated/irregular pairs of lines. For vision, as predicted, increased line separation disrupted symmetry detection more than repetition detection. For haptics, symmetry and repetition detection were similarly disrupted by increased line separation; also, symmetry was easier to detect than repetition for one-handed exploration and for body midline-aligned stimuli, whereas symmetry was harder to detect than repetition with two-handed exploration of stimuli oriented across the body...
July 2016: Experimental Psychology
Weifeng Luo, Christy M Guth, Olukemi Jolayemi, Craig L Duvall, Colleen Marie Brophy, Joyce Cheung-Flynn
Vascular stretch injury is associated with blunt trauma, vascular surgical procedures, and harvest of human saphenous vein for use in vascular bypass grafting. A model of subfailure overstretch in rat abdominal aorta was developed to characterize surgical vascular stretch injury. Longitudinal stretch of rat aorta was characterized ex vivo. Stretch to the haptic endpoint, where the tissues would no longer lengthen, occurred at twice the resting length. The stress produced at this length was greater than physiologic mechanical forces but well below the level of mechanical disruption...
2016: Frontiers in Bioengineering and Biotechnology
Allison Weaver, Scott Steele
Over the past few decades, robotic surgery has developed from a futuristic dream to a real, widely used technology. Today, robotic platforms are used for a range of procedures and have added a new facet to the development and implementation of minimally invasive surgeries. The potential advantages are enormous, but the current progress is impeded by high costs and limited technology. However, recent advances in haptic feedback systems and single-port surgical techniques demonstrate a clear role for robotics and are likely to improve surgical outcomes...
2016: F1000Research
Ali Talasaz, Ana Luisa Trejos, Rajni Patel
The lack of haptic feedback in roboticsassisted surgery can result in tissue damage or accidental tool-tissue hits. This paper focuses on exploring the effect of haptic feedback via direct force reflection and visual presentation of force magnitude on performance during robotics-assisted minimally invasive surgery (RAMIS) suturing. For this purpose, a haptics-enabled dual-arm master-slave teleoperation system capable of measuring tool-tissue interaction forces in all 7 Degrees-of-Freedom (DOFs) was used. Two suturing tasks, tissue puncturing and knottightening, were chosen to assess user skills when suturing on phantom tissue...
October 12, 2016: IEEE Transactions on Haptics
Anna Vera Cuppone, Valentina Squeri, Marianna Semprini, Lorenzo Masia, Jürgen Konczak
This study examined the trainability of the proprioceptive sense and explored the relationship between proprioception and motor learning. With vision blocked, human learners had to perform goal-directed wrist movements relying solely on proprioceptive/haptic cues to reach several haptically specified targets. One group received additional somatosensory movement error feedback in form of vibro-tactile cues applied to the skin of the forearm. We used a haptic robotic device for the wrist and implemented a 3-day training regimen that required learners to make spatially precise goal-directed wrist reaching movements without vision...
2016: PloS One
Bozho Todorich, Aristomenis Thanos, Yoshihiro Yonekawa, Benjamin J Thomas, Ashkan M Abbey, Lisa J Faia
PURPOSE: Secondary intraocular lens (IOL) placement in uveitic eyes is challenging. We describe a series of sclerally fixated IOLs using a transconjunctival sutureless (SIS) technique in eyes with history of uveitis. METHODS: This is an interventional, retrospective, consecutive case series. RESULTS: Five patients with a history of well-controlled uveitis were included. All underwent vitrectomy, with removal of residual lens fragments if necessary...
October 11, 2016: Ocular Immunology and Inflammation
Sang-Mok Lee, Hyuk Jin Choi, Heejin Choi, Mee Kum Kim, Won Ryang Wee
: BACKGROUND: Though the development and fitting of scleral contact lenses are expanding steadily, there is no simple method to provide scleral metrics for scleral contact lens fitting yet. The aim of this study was to establish formulae for estimation of the axial radius of curvature (ARC) of the anterior sclera using ocular biometric parameters that can be easily obtained with conventional devices. METHODS: A semi-automated stitching method and a computational analysis tool for calculating ARC were developed by using the ImageJ and MATLAB software...
October 7, 2016: BMC Ophthalmology
Takehiro Miki, Toshinori Iwai, Kazunori Kotani, Jianwu Dang, Hideyuki Sawada, Minoru Miyake
PURPOSE: Endoscope-assisted surgery has widely been adopted as a basic surgical procedure, with various training systems using virtual reality developed for this procedure. In the present study, a basic training system comprising virtual reality for the removal of submandibular glands under endoscope assistance was developed. The efficacy of the training system was verified in novice oral surgeons. MATERIAL AND METHODS: A virtual reality training system was developed using existing haptic devices...
August 31, 2016: Journal of Cranio-maxillo-facial Surgery
Fabio Oscari, Roberto Oboe, Omar Andres Daud Albasini, Stefano Masiero, Giulio Rosati
The use of haptic devices in the rehabilitation of impaired limbs has become rather popular, given the proven effectiveness in promoting recovery. In a standard framework, such devices are used in rehabilitation centers, where patients interact with virtual tasks, presented on a screen. To track their sessions, kinematic/dynamic parameters or performance scores are recorded. However, as Internet access is now available at almost every home and in order to reduce the hospitalization time of the patient, the idea of doing rehabilitation at home is gaining wide consent...
October 1, 2016: Sensors
Maria Laura D'Angelo, Ferdinando Cannella, Matteo Bianchi, Mariapaola D'Imperio, Edoardo Battaglia, Mattia Poggiani, Gianluca Rossi, Antonio Bicchi, Darwin G Caldwell
Understanding the mechanisms of human tactual perception represents a challenging task in haptics and humanoid robotics. A classic approach to tackle this issue is to accurately and exhaustively characterize the mechanical behaviour of human fingertip. The output of this characterization can then be exploited to drive the design of numerical models, which can be used to investigate in depth the mechanisms of human sensing. In this work, we present a novel integrated measurement technique and experimental set up for in vivo characterization of the deformation of the human fingertip at contact, in terms of contact area, force, deformation and pressure distribution...
September 29, 2016: IEEE Transactions on Haptics
Hongyi Xu, Jernej Barbic
We present an algorithm for fast continuous collision detection between points and signed distance fields, and demonstrate how to robustly use it for 6-DoF haptic rendering of contact between objects with complex geometry. Continuous collision detection is often needed in computer animation, haptics and virtual reality applications, but has so far only been investigated for polygon (triangular) geometry representations. We demonstrate how to robustly and continuously detect intersections between points and level sets of the signed distance field...
September 27, 2016: IEEE Transactions on Haptics
Simon J Hazenberg, Rob van Lier
In three experiments, we investigated the influence of object-specific sounds on haptic scene recognition without vision. Blindfolded participants had to recognize, through touch, spatial scenes comprising six objects that were placed on a round platform. Critically, in half of the trials, object-specific sounds were played when objects were touched (bimodal condition), while sounds were turned off in the other half of the trials (unimodal condition). After first exploring the scene, two objects were swapped and the task was to report, which of the objects swapped positions...
July 2016: I-Perception
Loes C J van Dam, Myrthe A Plaisier, Catharina Glowania, Marc O Ernst
Human touch is an inherently active sense: to estimate an object's shape humans often move their hand across its surface. This way the object is sampled both in a serial (sampling different parts of the object across time) and parallel fashion (sampling using different parts of the hand simultaneously). Both the serial (moving a single finger) and parallel (static contact with the entire hand) exploration modes provide reliable and similar global shape information, suggesting the possibility that this information is shared early in the sensory cortex...
October 4, 2016: Scientific Reports
Paula Bompastor-Ramos, João Póvoa, Conceição Lobo, Alejandra E Rodriguez, Jorge L Alió, Liliana Werner, Joaquim N Murta
PURPOSE: To report late postoperative opacification of a model of hydrophilic-hydrophobic acrylic intraocular lens (IOL) as well as the clinical consequences and laboratory characteristics. SETTING: Department of Ophthalmology, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal. DESIGN: Retrospective case series. METHODS: Medical records were reviewed of patients with Lentis LS-502-1 IOL opacification reporting visual loss who had IOL explantation between November 2013 and March 2015...
September 2016: Journal of Cataract and Refractive Surgery
Haemy Lee Masson, Christian Wallraven, Laurent Petit
Previous studies on visuo-haptic shape processing provide evidence that visually learned shape information can transfer to the haptic domain. In particular, recent neuroimaging studies have shown that visually learned novel objects that were haptically tested recruited parts of the ventral pathway from early visual cortex to the temporal lobe. Interestingly, in such tasks considerable individual variation in cross-modal transfer performance was observed. Here, we investigate whether this individual variation may be reflected in microstructural characteristics of white-matter (WM) pathways...
October 3, 2016: Human Brain Mapping
Hamed Azarnoush, Samaneh Siar, Robin Sawaya, Gmaan Al Zhrani, Alexander Winkler-Schwartz, Fahad Eid Alotaibi, Abdulgadir Bugdadi, Khalid Bajunaid, Ibrahim Marwa, Abdulrahman Jafar Sabbagh, Rolando F Del Maestro
OBJECTIVE Virtual reality simulators allow development of novel methods to analyze neurosurgical performance. The concept of a force pyramid is introduced as a Tier 3 metric with the ability to provide visual and spatial analysis of 3D force application by any instrument used during simulated tumor resection. This study was designed to answer 3 questions: 1) Do study groups have distinct force pyramids? 2) Do handedness and ergonomics influence force pyramid structure? 3) Are force pyramids dependent on the visual and haptic characteristics of simulated tumors? METHODS Using a virtual reality simulator, NeuroVR (formerly NeuroTouch), ultrasonic aspirator force application was continually assessed during resection of simulated brain tumors by neurosurgeons, residents, and medical students...
September 30, 2016: Journal of Neurosurgery
Mph Vleugels, Ccj Alleblas, T E Nieboer
No abstract text is available yet for this article.
November 2015: Journal of Minimally Invasive Gynecology
T E Nieboer, Ccj Alleblas, Mph Vleugels
No abstract text is available yet for this article.
November 2015: Journal of Minimally Invasive Gynecology
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