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https://www.readbyqxmd.com/read/28534787/effect-of-waveform-on-tactile-perception-by-electrovibration-displayed-on-touch-screens
#1
Yasemin Vardar, Burak Guclu, Cagatay Basdogan
In this study, we investigated the effect of input voltage waveform on our haptic perception of electrovibration on touch screens. Through psychophysical experiments performed with eight subjects, we first measured the detection thresholds of electrovibration stimuli generated by sinusoidal and square voltages at various fundamental frequencies. We observed that the subjects were more sensitive to stimuli generated by square wave voltage than sinusoidal one for frequencies lower than 60 Hz. Using Matlab simulations, we showed that the sensation difference of waveforms in low fundamental frequencies occurred due to the frequency-dependent electrical properties of human skin and human tactile sensitivity...
May 16, 2017: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28534068/trust-in-haptic-assistance-weighting-visual-and-haptic-cues-based-on-error-history
#2
Tricia L Gibo, Winfred Mugge, David A Abbink
To effectively interpret and interact with the world, humans weight redundant estimates from different sensory cues to form one coherent, integrated estimate. Recent advancements in physical assistance systems, where guiding forces are computed by an intelligent agent, enable the presentation of augmented cues. It is unknown, however, if cue weighting can be extended to augmented cues. Previous research has shown that cue weighting is determined by the reliability (inversely related to uncertainty) of cues within a trial, yet augmented cues may also be affected by errors that vary over trials...
May 22, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28532184/a-review-of-invasive-and-non-invasive-sensory-feedback-in-upper-limb-prostheses
#3
Pamela Svensson, Ulrika Wijk, Anders Björkman, Christian Antfolk
The constant challenge to restore sensory feedback in prosthetic hands has provided several research solutions, but virtually none has reached clinical fruition. A prosthetic hand with sensory feedback that closely imitates an intact hand and provides a natural feeling may induce the prosthetic hand to be included in the body image and also reinforces the control of the prosthesis. Areas covered: This review presents non-invasive sensory feedback systems such as mechanotactile, vibrotactile, electrotactile and combinational systems which combine the modalities; multi-haptic feedback...
May 22, 2017: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/28531983/development-of-haptic-based-piezoresistive-artificial-fingertip-toward-efficient-tactile-sensing-systems-for-humanoids
#4
Amin TermehYousefi, Saman Azhari, Amin Khajeh, Mohd Nizar Hamidon, Hirofumi Tanaka
Haptic sensors are essential devices that facilitate human-like sensing systems such as implantable medical devices and humanoid robots. The availability of conducting thin films with haptic properties could lead to the development of tactile sensing systems that stretch reversibly, sense pressure (not just touch), and integrate with collapsible. In this study, a nanocomposite based hemispherical artificial fingertip fabricated to enhance the tactile sensing systems of humanoid robots. To validate the hypothesis, proposed method was used in the robot-like finger system to classify the ripe and unripe tomato by recording the metabolic growth of the tomato as a function of resistivity change during a controlled indention force...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28513545/a-study-on-immersion-and-presence-of-a-portable-hand-haptic-system-for-immersive-virtual-reality
#5
Mingyu Kim, Changyu Jeon, Jinmo Kim
This paper proposes a portable hand haptic system using Leap Motion as a haptic interface that can be used in various virtual reality (VR) applications. The proposed hand haptic system was designed as an Arduino-based sensor architecture to enable a variety of tactile senses at low cost, and is also equipped with a portable wristband. As a haptic system designed for tactile feedback, the proposed system first identifies the left and right hands and then sends tactile senses (vibration and heat) to each fingertip (thumb and index finger)...
May 17, 2017: Sensors
https://www.readbyqxmd.com/read/28513095/research-of-the-master-slave-robot-surgical-system-with-the-function-of-force-feedback
#6
Yunyong Shi, Chaozheng Zhou, Le Xie, Yongjun Chen, Jun Jiang, Zhenfeng Zhang, Ze Deng
BACKGROUND: Surgical robots lack force feedback, which may lead to operation errors. In order to improve surgical outcomes, this research developed a new master-slave surgical robot, which was designed with an integrated force sensor. METHODS: The new structure designed for the master-slave robot employs a force feedback mechanism. A six-dimensional force sensor was mounted on the tip of the slave robot's actuator. Sliding model control was adopted to control the slave robot...
May 17, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/28507503/improving-challenge-skill-ratio-in-a-multimodal-interface-by-simultaneously-adapting-game-difficulty-and-haptic-assistance-through-psychophysiological-and-performance-feedback
#7
Carlos Rodriguez-Guerrero, Kristel Knaepen, Juan C Fraile-Marinero, Javier Perez-Turiel, Valentin Gonzalez-de-Garibay, Dirk Lefeber
In order to harmonize robotic devices with human beings, the robots should be able to perceive important psychosomatic impact triggered by emotional states such as frustration or boredom. This paper presents a new type of biocooperative control architecture, which acts toward improving the challenge/skill relation perceived by the user when interacting with a robotic multimodal interface in a cooperative scenario. In the first part of the paper, open-loop experiments revealed which physiological signals were optimal for inclusion in the feedback loop...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28502021/the-visual-and-haptic-contributions-to-hand-perception
#8
Lara A Coelho, Claudia Lr Gonzalez
Previous research has found that the perception of our hands is distorted. The characteristics of this distortion are an overestimation of hand width and an underestimation of finger length. The present study examined the role that different sensory modalities (vision and/or haptics) play in the perception of our hands. Participants pointed to their concealed hand in one of three groups: Vision+Haptics, Vision-only, or Haptics-only. Participants in the Vision+Haptics group had vision (non-informative) of the experimental setup and of the pointing hand, but no vision of the hand being estimated...
May 13, 2017: Psychological Research
https://www.readbyqxmd.com/read/28501420/manipulation-of-visual-information-affects-control-strategy-during-a-visuomotor-tracking-task
#9
Paulina J M Bank, Lucas R M Dobbe, Carel G M Meskers, Jurriaan H de Groot, Erwin de Vlugt
Proper understanding of motor control requires insight into the extent and manner in which task performance and control strategy are influenced by various aspects of visual information. We therefore systematically manipulated the visual presentation (i.e., scaling factor and optical flow density) of a visuomotor tracking task without changing the task itself, and investigated the effect on performance, effort, motor control strategy (i.e., anticipatory or corrective steering) and underlying neuromechanical parameters (i...
May 10, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28500008/wearable-haptic-systems-for-the-fingertip-and-the-hand-taxonomy-review-and-perspectives
#10
Claudio Pacchierotti, Stephen Sinclair, Massimiliano Solazzi, Antonio Frisoli, Vincent Hayward, Domenico Prattichizzo
In the last decade, we have witnessed a drastic change in the form factor of audio and vision technologies, from heavy and grounded machines to lightweight devices that naturally fit our bodies. However, only recently, haptic systems have started to be designed with wearability in mind. The wearability of haptic systems enables novel forms of communication, cooperation, and integration between humans and machines. Wearable haptic interfaces are capable of communicating with the human wearers during their interaction with the environment they share, in a natural and yet private way...
May 9, 2017: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28500006/skill-learning-and-skill-transfer-mediated-by-cooperative-haptic-interaction
#11
Edwin Johnatan Avila Mireles, Jacopo Zenzeri, Velentina Squeri, Pietro Morasso, Dalia De Santis
It is known that physical coupling between two subjects may be advantageous in joint tasks. However, little is known about how two people mutually exchange information to exploit the coupling. Therefore we adopted a reversed, novel perspective to the standard one that focuses on the ability of physically coupled subjects to adapt to cooperative contexts that require negotiating a common plan: we investigated how training in pairs on a novel task affects the development of motor skills of each of the interacting partners...
May 8, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28496293/the-effect-of-dopaminergic-medication-on-joint-kinematics-during-haptic-movements-in-individuals-with-parkinson-s-disease
#12
Kuan-Yi Li, Pei-Yi Chu, Kristen A Pickett
This study examined whether altered joint angular motion during haptic exploration could account for a decline in haptic sensitivity in individuals with PD by analyzing joint position data during haptic exploration of a curved contour. Each participant's hand was passively moved by a robotic arm along the edges of a virtual box (5 cm × 15 cm) with a curved left wall. After each trial, participants indicated whether the contour was curved or straight. Visual, auditory, and tactile cues were occluded, and an electrogoniometer recorded shoulder and elbow joint angles during each trial...
2017: Behavioural Neurology
https://www.readbyqxmd.com/read/28494226/the-effect-of-prior-experience-on-children-s-tool-innovation
#13
Clare L Whalley, Nicola Cutting, Sarah R Beck
Spontaneous tool innovation to solve physical problems is difficult for young children. In three studies, we explored the effect of prior experience with tools on tool innovation in children aged 4-7years (N=299). We also gave children an experience more consistent with that experienced by corvids in similar studies to enable fairer cross-species comparisons. Children who had the opportunity to use a premade target tool in the task context during a warm-up phase were significantly more likely to innovate a tool to solve the problem on the test trial compared with children who had no such warm-up experience...
May 8, 2017: Journal of Experimental Child Psychology
https://www.readbyqxmd.com/read/28489529/modeling-touch-and-palpation-using-autoregressive-models
#14
Shlomi Laufer, Carla Pugh, Barry D Van Veen
OBJECTIVE: The human haptic system uses a set of reproducible and subconscious hand maneuvers to identify objects. Similar subconscious maneuvers are used during medical palpation for screening and diagnosis. The goal of this work was to develop a mathematical model that can be used to describe medical palpation techniques. METHODS: Palpation data were measured using a two-dimensional array of force sensors. A novel algorithm for estimating the hand position from force data was developed...
May 5, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28486087/lack-of-transfer-of-skills-after-virtual-reality-simulator-training-with-haptic-feedback
#15
Cecilie Våpenstad, Erlend Fagertun Hofstad, Lars Eirik Bø, Esther Kuhry, Gjermund Johnsen, Ronald Mårvik, Thomas Langø, Toril Nagelhus Hernes
BACKGROUND AND OBJECTIVE: Virtual reality (VR) simulators enrich surgical training and offer training possibilities outside of the operating room (OR). In this study, we created a criterion-based training program on a VR simulator with haptic feedback and tested it by comparing the performances of a simulator group against a control group. MATERIAL AND METHODS: Medical students with no experience in laparoscopy were randomly assigned to a simulator group or a control group...
May 9, 2017: Minimally Invasive Therapy & Allied Technologies: MITAT
https://www.readbyqxmd.com/read/28470408/features-of-haptic-and-tactile-feedback-in-tors-a-comparison-of-available-surgical-systems
#16
Daniel T Friedrich, L Dürselen, B Mayer, S Hacker, F Schall, J Hahn, T K Hoffmann, P J Schuler, J Greve
Sustained interest and an increase of possible indications endorse the role of robot-assisted surgery of the head and neck region. However, broad clinical application is impeded by substantial extra cost, time exposure and a supposed deficit of haptic and tactile feedback. The role of haptic feedback has barely been examined in this context, and literature provides only limited objective validation. This point of criticism applies to all commercially available systems. We created an experimental setup to evaluate, quantify and compare the performance of surgical systems...
May 3, 2017: Journal of Robotic Surgery
https://www.readbyqxmd.com/read/28467005/real-time-simulation-of-soft-tissue-deformation-and-electrocautery-procedures-in-laparoscopic-rectal-cancer-radical-surgery
#17
Yuan Sui, Jun J Pan, Hong Qin, Hao Liu, Yun Lu
BACKGROUND: Laparoscopic surgery (LS), also referred to as minimally invasive surgery, is a modern surgical technique which is widely applied. The fulcrum effect makes LS a non-intuitive motor skill with a steep learning curve. METHODS: A hybrid model of tetrahedrons and a multi-layer triangular mesh are constructed to simulate the deformable behavior of the rectum and surrounding tissues in the Position-Based Dynamics (PBD) framework. A heat-conduction based electric-burn technique is employed to simulate the electrocautery procedure...
May 3, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/28463617/robot-assisted-procedures-in-pediatric-neurosurgery
#18
Alessandro De Benedictis, Andrea Trezza, Andrea Carai, Elisabetta Genovese, Emidio Procaccini, Raffaella Messina, Franco Randi, Silvia Cossu, Giacomo Esposito, Paolo Palma, Paolina Amante, Michele Rizzi, Carlo Efisio Marras
OBJECTIVE During the last 3 decades, robotic technology has rapidly spread across several surgical fields due to the continuous evolution of its versatility, stability, dexterity, and haptic properties. Neurosurgery pioneered the development of robotics, with the aim of improving the quality of several procedures requiring a high degree of accuracy and safety. Moreover, robot-guided approaches are of special interest in pediatric patients, who often have altered anatomy and challenging relationships between the diseased and eloquent structures...
May 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28460321/wearable-lower-limb-haptic-feedback-device-for-retraining-foot-progression-angle-and-step-width
#19
Daniel K Y Chen, Markus Haller, Thor F Besier
Technological developments in the last decade have enabled the integration of sensors and actuators into wearable devices for gait interventions to slow the progression of knee osteoarthritis. Wearable haptic gait retraining is one area which has seen promising results for informing modifications of gait parameters for reducing knee adduction moments (KAM) during walking. Two gait parameters which can be easily adjusted to influence KAM include foot progression angle (FPA) and step width (SW). The purpose of this study was to: (1) determine whether a custom haptic ankle bracelet using binary vibrotactile and tactile apparent movement feedback could retrain ten healthy subjects to walk with a modified FPA and SW within a short training session with 80% accuracy; and (2) whether there was a difference between the number of steps required to complete the retraining task based on the two feedback schemes being tested...
April 24, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28457613/flanged-intrascleral-intraocular-lens-fixation-with-double-needle-technique
#20
Shin Yamane, Shimpei Sato, Maiko Maruyama-Inoue, Kazuaki Kadonosono
PURPOSE: To report the clinical outcomes of a new technique for transconjunctival intrascleral fixation of an intraocular lens (IOL). DESIGN: Prospective, noncomparative, interventional case series. PARTICIPANTS: One hundred eyes of 97 consecutive patients with aphakia, dislocated IOL, or subluxated crystalline lens who underwent posterior chamber sutureless implantation of an IOL were studied. METHODS: Two angled incisions parallel to the limbus were made by 30-gauge thin-wall needles...
April 27, 2017: Ophthalmology
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