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Soha Saleh, Gerard Fluet, Qinyin Qiu, Alma Merians, Sergei V Adamovich, Eugene Tunik
Several approaches to rehabilitation of the hand following a stroke have emerged over the last two decades. These treatments, including repetitive task practice (RTP), robotically assisted rehabilitation and virtual rehabilitation activities, produce improvements in hand function but have yet to reinstate function to pre-stroke levels-which likely depends on developing the therapies to impact cortical reorganization in a manner that favors or supports recovery. Understanding cortical reorganization that underlies the above interventions is therefore critical to inform how such therapies can be utilized and improved and is the focus of the current investigation...
2017: Frontiers in Neurology
Randall B Hellman, Cem Tekin, Mihaela van der Schaar, Veronica J Santos
Many tasks involve the fine manipulation of objects despite limited visual feedback. In such scenarios, tactile and proprioceptive feedback can be leveraged for task completion. We present an approach for real-time haptic perception and decision-making for a haptics-driven, functional contour-following task: the closure of a ziplock bag. This task is challenging for robots because the bag is deformable, transparent, and visually occluded by artificial fingertip sensors that are also compliant. A deep neural net classifier was trained to estimate the state of a zipper within a robot's pinch grasp...
September 18, 2017: IEEE Transactions on Haptics
Hae-Jin Kim, Kyoseung Sim, Anish Thukral, Cunjiang Yu
A general strategy to impart mechanical stretchability to stretchable electronics involves engineering materials into special architectures to accommodate or eliminate the mechanical strain in nonstretchable electronic materials while stretched. We introduce an all solution-processed type of electronics and sensors that are rubbery and intrinsically stretchable as an outcome from all the elastomeric materials in percolated composite formats with P3HT-NFs [poly(3-hexylthiophene-2,5-diyl) nanofibrils] and AuNP-AgNW (Au nanoparticles with conformally coated silver nanowires) in PDMS (polydimethylsiloxane)...
September 2017: Science Advances
Francesca Marini, Sara Contu, Chris W Antuvan, Pietro Morasso, Lorenzo Masia
Proprioception combines information from cutaneous, joint, tendon, and muscle receptors for maintaining a reliable internal body image. However, it is still a matter of debate, in both neurophysiology and psychology, to what extent such body image is modified or distorted by a changing haptic environment. In particular, what is worth investigating is the contribution of external forces on our perception of body and joint configuration. The proprioceptive acuity of fifteen young participants was tested with a Joint Position Matching (JPM) task, performed with the dominant wrist under five different external forces, in order to understand to what extent they affect proprioceptive acuity...
2017: Frontiers in Human Neuroscience
Lei Wei, Hailing Zhou, Saeid Nahavandi
This paper presents a method to alleviate performance degradation issues of Haptic Collision Detection when the Bounding Volumes or Bounding Volume Hierarchies of multiple disjoint objects are overlapping or inclusive and force the Haptic Collision Detection methods into narrow phase collision detection with all involved objects. The proposed method aims to generate tighter, mutually exclusive Bounding Volumes at the pre-processing stage, and to quickly cull irrelevant nearby objects at the broad phase to ensure that the Haptic Collision Detection methods will not be overloaded with unnecessary narrow phase collision detection...
September 8, 2017: IEEE Transactions on Haptics
Antonino Spinelli, Giulia David, Stefano Gidaro, Michele Carvello, Matteo Sacchi, Marco Montorsi, Isacco Montroni
The use of robotic techniques is increasing in colorectal surgery. Recently, the Senhance(™) surgical robotic system was introduced as a novel robotic platform designed to overcome some of the limits of standard laparoscopy. This study describes the initial, single center experience, evaluating feasibility and safety of the new robotic system in performing colorectal surgical procedures. METHODS: From June 2015 to November 2016, perioperative data of the first 45 patients who underwent robotic colorectal surgery with the SenhanceTM surgical robotic system were collected and analyzed...
September 14, 2017: Colorectal Disease: the Official Journal of the Association of Coloproctology of Great Britain and Ireland
Haemy Lee Masson, Hyeok-Mook Kang, Laurent Petit, Christian Wallraven
Touch delivers a wealth of information already from birth, helping infants to acquire knowledge about a variety of important object properties using their hands. Despite the fact that we are touch experts as much as we are visual experts, surprisingly, little is known how our perceptual ability in touch is linked to either functional or structural aspects of the brain. The present study, therefore, investigates and identifies neuroanatomical correlates of haptic perceptual performance using a novel, multi-modal approach...
September 13, 2017: Brain Structure & Function
Erato Psarra, Laurence Bodelot, Kostas Danas
The stability and post-bifurcation of a non-linear magnetoelastic film/substrate block is experimentally exploited to obtain active control of surface roughness. The non-intuitive interplay between magnetic field and elastic deformation owes to material and geometry selection, namely a ferromagnetic particle composite film bonded on a compliant passive foundation. Cooperation of the two otherwise independent loading mechanisms-mechanical pre-compression and magnetic field-allows one to bring the structure near a marginally stable state and then destabilize it with either magnetic or mechanical fields...
September 13, 2017: Soft Matter
C Quesada, I Alfaro, D González, F Chinesta, E Cueto
We present a method for the real-time, interactive simulation of tissue tearing during laparoscopic surgery. The method is designed to work at haptic feedback rates (i.e., around 1kHz). Tissue tearing is simulated under the general framework of continuum damage mechanics. The problem is stated as a general, multidimensional parametric problem, which is solved by means of Proper Generalized Decomposition (PGD) methods. One of the main novelties is the reduction of history-dependent problems, such as damage mechanics, by resorting to an approach in which a reduced-order field of initial damage values is considered as a parameter of the formulation...
September 12, 2017: International Journal for Numerical Methods in Biomedical Engineering
Kisuk Choi, Chun Yan Gao, Jae Do Nam, Hyoung Jin Choi
Cellulose particles, their derivatives and composites have special environmentally benign features and are abundant in nature with their various applications. This review paper introduces the essential properties of several types of cellulose and their derivatives obtained from various source materials, and their use in electro-responsive electrorheological (ER) suspensions, which are smart fluid systems that are actively responsive under applied electric fields, while, at zero electric field, ER fluids retain a liquid-like state...
September 10, 2017: Materials
Léa A S Chauvigné, Michel Belyk, Steven Brown
Interpersonal coordination during joint action depends on the perception of the partner's movements. In many such situations - for example, while moving furniture together or dancing a tango - there are kinesthetic interactions between the partners due to the forces shared between them that allow them to directly perceive one another's movements. Joint action of this type often involves a contrast between the roles of leader and follower, where the leader imparts forces onto the follower, and the follower has to be responsive to these force-cues during movement...
2017: Journal of Integrative Neuroscience
Patrick Daigle, Marjorie Carbonneau
PURPOSE: To report a case of diffuse intraocular lens (IOL) opacification in a patient who started complaining of blurred vision in his left eye over the course of three years after having phacoemulsification surgery combined with capsular bag fixation of a C-flex 570C IOL. The IOL had been repositioned in the ciliary sulcus following its subluxation. METHOD: An IOL exchange was performed, and the explanted IOL was sent for histopathological analysis. RESULTS: Scanning electron microscopy identified multiple crystalline-like deposits on both sides of the IOL...
September 8, 2017: International Ophthalmology
R Daniels
It is international consensus that the daily use of properly selected products for the maintenance therapy is a must in the adjuvant treatment of most chronic skin diseases. In a first step, the selection of an adequate product can be guided by the classical triangle of the dermal vehicles. However, modern skin care products use diverse excipients, e. g. emulsifiers and viscosity enhancers, to improve the galenical and haptic properties of the formulations. It is thus no longer sufficient to simply have knowledge about the oil and water content of a cream in order to make a proper selection...
September 6, 2017: Der Hautarzt; Zeitschrift Für Dermatologie, Venerologie, und Verwandte Gebiete
Cléber Gimenez Corrêa, Maria Aparecida de Andrade Moreira Machado, Edith Ranzini, Romero Tori, Fátima de Lourdes Santos Nunes
Objectives: This study shows the development and validation of a dental anesthesia-training simulator, specifically for the inferior alveolar nerve block (IANB). The system developed provides the tactile sensation of inserting a real needle in a human patient, using Virtual Reality (VR) techniques and a haptic device that can provide a perceived force feedback in the needle insertion task during the anesthesia procedure. Material and Methods: To simulate a realistic anesthesia procedure, a Carpule syringe was coupled to a haptic device...
July 2017: Journal of Applied Oral Science: Revista FOB
Mirjam Augstein, Thomas Neumayr, Thomas Burger
Most input devices, also traditional ones like keyboard and mouse involve at least a certain amount of haptic experience. For instance, they require direct physical contact between user and device and provide direct haptic feedback (e.g., through the physical resistance of a key). However, in the past years, also touchless input devices and techniques gained broader attention as they e.g., allow for a restriction of physical boundaries that limit the possible range of user input activities. This paper discusses the role of haptics in user input with a particular focus on the needs of people with impairments and presents the results of a study comparing three input devices, each involving a different amount of haptic experience...
2017: Studies in Health Technology and Informatics
Aviad Ozana, Tzvi Ganel
Visually guided grasping movements directed to real, 3D objects are characterized by a distinguishable trajectory pattern that evades the influence of Weber's law, a basic principle of perception. Conversely, grasping trajectories directed to 2D line drawings of objects adhere to Weber's law. It can be argued, therefore, that during 2D grasping, the visuomotor system fails at operating in analytic mode and is intruded by irrelevant perceptual information. Here, we explored the visual and tactile cues that enable such analytic processing during grasping...
September 4, 2017: Psychological Research
Takeshi Tanabe, Hiroaki Yano, Hiroo Iwata
This paper describes the properties of proprioceptive sensations induced by asymmetric vibration using a vibration speaker-type non-grounded haptic interface. We confirm that the vibration speaker generates a perceived force that pulls or pushes a user's hand in a particular direction when an asymmetric amplitude signal that is generated by inverting a part of a sine wave is input. In this paper, to verify the system with respect to various factors of force perception caused by asymmetric vibration, we conducted six experiments and the following results were obtained...
August 29, 2017: IEEE Transactions on Haptics
Michael Walker, Kyle Brandon Reed
This research investigated several haptic interfaces designed to reduce mistakes in Morse code reception. Results concluded that a bimanual setup, discriminating dots/dashes by left/right location, reduced the amount of errors to only 56.6% of the errors compared to a unimanual setup that used temporal discrimination to distinguish dots and dashes.
August 24, 2017: IEEE Transactions on Haptics
Ashkan Pourkand, Naghmeh Zamani, David Grow
In this study, augmented-haptic feedback is used to combine a physical object with virtual elements in order to simulate anatomic variability in bone. This requires generating levels of force/torque consistent with clinical bone drilling, which exceed the capabilities of commercially available haptic devices. Accurate total force generation is facilitated by a predictive model of axial force during simulated orthopaedic drilling. This model is informed by kinematic data collected while drilling into synthetic bone samples using an instrumented linkage attached to the orthopaedic drill...
June 30, 2017: Computers in Biology and Medicine
Ane Gurtubay-Antolin, Antoni Rodríguez-Fornells
Previous research assessing the presence of enhanced tactile skills in early-blind (EB) population obtained conflicting results. Most of the studies relied on behavioral measures with which different mechanisms leading to the same outcome go unnoticed. Moreover, the scarce electrophysiological research that has been conducted focused exclusively on the processing of microgeometric properties. To clarify the extent of superior tactile abilities in EBs using high-density multichannel electrophysiological recordings, the present study compared the electrophysiological correlates of EBs and sighted controls (CON) in two tactile discrimination tasks that targeted microgeometric (texture) and macrogeometric (shape) properties...
August 24, 2017: NeuroImage
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