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https://www.readbyqxmd.com/read/28431740/getting-a-grip-on-reality-grasping-movements-directed-to-real-objects-and-images-rely-on-dissociable-neural-representations
#1
Erez Freud, Scott N Macdonald, Juan Chen, Derek J Quinlan, Melvyn A Goodale, Jody C Culham
In the current era of touchscreen technology, humans commonly execute visually guided actions directed to two-dimensional (2D) images of objects. Although real, three-dimensional (3D), objects and images of the same objects share high degree of visual similarity, they differ fundamentally in the actions that can be performed on them. Indeed, previous behavioral studies have suggested that simulated grasping of images relies on different representations than actual grasping of real 3D objects. Yet the neural underpinnings of this phenomena have not been investigated...
March 18, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28430322/prewound-assisted-technique-for-hydrophobic-foldable-intraocular-lens-implantation
#2
Takuya Shiba, Hiroshi Tsuneoka
PURPOSE: To describe a technique for intraocular lens (IOL) implantation that lessens the degree of surgical invasiveness by implanting a tightly rolled IOL through a small incision without touching the eye with the cartridge tip. METHODS: An IOL was inserted through an incision by first allowing the leading haptic to protrude slightly from the cartridge tip. It was then injected through the incision without allowing any part of the cartridge to touch the eye during IOL implantation...
April 7, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28427295/development-of-visuo-haptic-transfer-for-object-recognition-in-typical-preschool-and-school-aged-children
#3
Giulia Purpura, Giovanni Cioni, Francesca Tinelli
Object recognition is a long and complex adaptive process and its full maturation requires combination of many different sensory experiences as well as cognitive abilities to manipulate previous experiences in order to develop new percepts and subsequently to learn from the environment. It is well recognized that the transfer of visual and haptic information facilitates object recognition in adults, but less is known about development of this ability. In this study, we explored the developmental course of object recognition capacity in children using unimodal visual information, unimodal haptic information, and visuo-haptic information transfer in children from 4 years to 10 years and 11 months of age...
April 20, 2017: Child Neuropsychology: a Journal on Normal and Abnormal Development in Childhood and Adolescence
https://www.readbyqxmd.com/read/28423455/simulation-and-curriculum-design-a-global-survey-in-dental-education
#4
S Perry, M F Burrow, W K Leung, S M Bridges
BACKGROUND: Curriculum reforms are being driven by globalisation and international standardisation. Although new information technologies such as dental haptic virtual reality (VR) simulation systems have provided potential new possibilities for clinical learning in dental curricula, infusion into curricula requires careful planning. METHODS: This study aimed to identify current patterns in the role and integration of simulation in dental degree curricula internationally...
April 19, 2017: Australian Dental Journal
https://www.readbyqxmd.com/read/28410710/supracapsular-glued-intraocular-lens-in%C3%A2-progressive-subluxated-cataracts-technique-to-retain-an-intact-vitreous-face
#5
Soosan Jacob, Smita Narasimhan, Amar Agarwal, Cosimo Mazzotta, Miguel Rechichi, Athiya Agarwal
We describe a technique to prevent late intraocular lens (IOL) subluxation and dislocation that can be associated with progressive zonulopathy. Supracapsular glued IOL fixation is done to retain an intact anterior hyaloid face and avoid vitreous disturbance while providing stable long-term IOL fixation. Phacoemulsification is followed by glued IOL implantation above intact anterior and posterior capsules. Sclerotomies are created ab interno in a supracapsular plane under diametrically opposite lamellar scleral flaps without entering the vitreous cavity...
March 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28395001/the-impact-of-simultaneously-applying-normal-stress-and-vibrotactile-stimulation-for-feedback-of-exteroceptive-information
#6
M Reza Motamedi, Martin Otis, Vincent Duchaine
Commercially available prosthetic hands do not convey any tactile information, forcing amputees to rely solely on visual attention. A promising solution to this problem is haptics, which could lead to new prostheses in which tactile information is conveyed between the amputee and the artificial limb. This paper investigates how the simultaneous application of two different types of haptic feedback - vibration and normal stress - impacts the human sensory perception of each separate feedback type. These stimuli were applied to glabrous skin on the forearms of 14 participants...
April 10, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28394168/the-development-of-haptic-processing-skills-from-childhood-to-adulthood-by-means-of-two-dimensional-materials
#7
Anaïs Mazella, Jean-Michel Albaret, Delphine Picard
Research into haptic perception has mostly focused on 3-dimensional objects, and more needs to be known about the processing of 2-dimensional materials (e.g., raised dots and lines and raised-line shapes, patterns and pictures). This study examines the age-related changes in various skills related to the haptic exploration of 2-dimensional raised-line and dot materials and how these skills are related to haptic picture perception. Ninety-one participants, aged 4 years to adult, were asked to perform a series of haptic tasks that entailed (a) finding dots and following lines; (b) matching elements based on texture, shape, and size; (c) matching elements based on spatial location and orientation; (d) memorising sequences of dots and shapes; and (e) identifying complete and incomplete raised-line pictures...
April 10, 2017: Canadian Journal of Experimental Psychology, Revue Canadienne de Psychologie Expérimentale
https://www.readbyqxmd.com/read/28393162/human-cell-based-taste-perception-a-bittersweet-job-for-industry
#8
K Riedel, D Sombroek, B Fiedler, K Siems, M Krohn
Covering: 2000 to 2016On the molecular level humans sense food by a variety of specialized tissues which express sensory receptors to handle nutritive value. In general, this means the interplay of gustatory, olfactory, trigeminal and haptic sensation is translated into perception and leads, in terms of taste, to descriptions like sweet, bitter, salty, sour and umami. Further perceptions include astringent, cool, hot, prickle, lingering, kokumi and fatty to name predominant characterizations. It is still not fully understood how this plethora of impressions can be perceived by quite a limited number of receptors obviously being the initial compilers to judge palatability...
April 10, 2017: Natural Product Reports
https://www.readbyqxmd.com/read/28391207/evaluation-of-wearable-haptic-systems-for-the-fingers-in-augmented-reality-applications
#9
Maurizio Maisto, Claudio Pacchierotti, Francesco Chinello, Gionata Salvietti, Alessandro De Luca, Domenico Prattichizzo
Although Augmented Reality (AR) has been around for almost five decades, only recently we have witnessed AR systems and applications entering in our everyday life. Representative examples of this technological revolution are the smartphone games "Pok´emon GO" and "Ingress" or the Google Translate real-time sign interpretation app. Even if AR applications are already quite compelling and widespread, users are still not able to physically interact with the computer-generated reality. In this respect, wearable haptics can provide the compelling illusion of touching the superimposed virtual objects without constraining the motion or the workspace of the user...
April 5, 2017: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28387688/using-visual-stimuli-to-enhance-gait-control
#10
Christopher K Rhea, Nikita A Kuznetsov
Gait control challenges commonly coincide with vestibular dysfunction and there is a long history in using balance and gait activities to enhance functional mobility in this population. While much has been learned using traditional rehabilitation exercises, there is a new line of research emerging that is using visual stimuli in a very specific way to enhance gait control. For example, avatars can be created in an individualized manner to incorporate specific gait characteristics. The avatar could then be used as a visual stimulus to which the patient can synchronize their own gait cycle...
2017: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/28386712/vision-adds-to-haptics-when-dyads-perform-a-whole-body-joint-balance-task
#11
Eric Eils, Rouwen Cañal-Bruland, Leonie Sieverding, Marc H E de Lussanet, Karen Zentgraf
When two or more people aim to produce joint action outcomes they need to coordinate their individual actions in space and time. Successful joint action performance has been reported to depend, among others, on visual and somatosensory information provided to the joint actors. This study investigated whether and how the systematic manipulation of visual information modulates real-time joint action when dyads performed a whole-body joint balance task. To this end, we introduced the Joint Action Board (JAB) where partners guided a ball through a maze towards a virtual hole by jointly shifting their weight on the board under three visual conditions: (1) the Follower had neither visual access to the Leader nor to the maze; (2) the Follower had no visual access to the maze but to the Leader; (3) the Follower had full visual access to both the Leader and to the maze...
April 6, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28386578/large-field-of-view-optical-elastography-using-digital-image-correlation-for-biological-soft-tissue-investigation
#12
Daniel Claus, Marijo Mlikota, Jonathan Geibel, Thomas Reichenbach, Giancarlo Pedrini, Johannes Mischinger, Siegfried Schmauder, Wolfgang Osten
In minimally invasive surgery the haptic feedback, which represents an important tool for the localization of abnormalities, is no longer available. Elastography is an imaging technique that results in quantitative elastic parameters. It can hence be used to replace the lost sense of touch, as to enable tissue localization and discrimination. Digital image correlation is the chosen elastographic imaging technique. The implementation discussed here is clinically sound, based on a spectrally engineered illumination source that enables imaging of biological surface markers (blood vessels) with high contrast...
January 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28386067/evaluation-of-direct-haptic-4d-volume-rendering-of-partially-segmented-data-for-liver-puncture-simulation
#13
Andre Mastmeyer, Dirk Fortmeier, Heinz Handels
This work presents an evaluation study using a force feedback evaluation framework for a novel direct needle force volume rendering concept in the context of liver puncture simulation. PTC/PTCD puncture interventions targeting the bile ducts have been selected to illustrate this concept. The haptic algorithms of the simulator system are based on (1) partially segmented patient image data and (2) a non-linear spring model effective at organ borders. The primary aim is to quantitatively evaluate force errors caused by our patient modeling approach, in comparison to haptic force output obtained from using gold-standard, completely manually-segmented data...
April 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28383963/on-the-origin-of-body-related-influences-on-visual-perception
#14
Wladimir Kirsch, Oliver Herbort, Benjamin Ullrich, Wilfried Kunde
The human body and the potential to move it affect the way we perceive the world. Here we explored a possible origin of such action-specific effects on perception. Participants were asked to enclose a virtual object by movements of their index finger and thumb and judged either the actual finger-thumb distance or the size of the virtual object subsequently. The visual-haptic discrepancy that comes with such virtual grasping resulted in a mutual impact of visual and body-related signals: the visual judgments of object's size were attracted by the felt finger posture and vice versa, judged finger distance was attracted by the size of the grasped object...
April 6, 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/28374841/artificial-spatiotemporal-touch-inputs-reveal-complementary-decoding-in-neocortical-neurons
#15
Calogero M Oddo, Alberto Mazzoni, Anton Spanne, Jonas M D Enander, Hannes Mogensen, Fredrik Bengtsson, Domenico Camboni, Silvestro Micera, Henrik Jörntell
Investigations of the mechanisms of touch perception and decoding has been hampered by difficulties in achieving invariant patterns of skin sensor activation. To obtain reproducible spatiotemporal patterns of activation of sensory afferents, we used an artificial fingertip equipped with an array of neuromorphic sensors. The artificial fingertip was used to transduce real-world haptic stimuli into spatiotemporal patterns of spikes. These spike patterns were delivered to the skin afferents of the second digit of rats via an array of stimulation electrodes...
April 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28372470/the-effect-of-a-haptic-biofeedback-system-on-postural-control-in-patients-with-stroke-an-experimental-pilot-study
#16
Kazuhiro Yasuda, Naomi Kaibuki, Hiroaki Harashima, Hiroyasu Iwata
BACKGROUND: Impaired balance in patients with hemiparesis caused by stroke is frequently related to deficits in the central integration of afferent inputs, and traditional rehabilitation reinforces excessive visual reliance by focusing on visual compensation. OBJECTIVE: The present study investigated whether a balance task involving a haptic biofeedback (BF) system, which provided supplementary vibrotactile sensory cues associated with center-of-foot-pressure displacement, improved postural control in patients with stroke...
April 3, 2017: Somatosensory & Motor Research
https://www.readbyqxmd.com/read/28372429/modeling-and-test-of-a-kinaesthetic-actuator-based-on-mr-fluid-for-haptic-applications
#17
Tae-Heon Yang, Jeong-Hoi Koo, Sang-Youn Kim, Dong-Soo Kwon
Haptic display units have been widely used for conveying button sensations to users, primarily employing vibrotactile actuators. However, the human feeling for pressing buttons mainly relies on kinaesthetic sensations (rather than vibrotactile sensations), and little studies exist on small-scale kinaesthetic haptic units. Thus, the primary goals of this paper are to design a miniature kinaesthetic actuator based on Magneto-Rheological (MR) fluid that can convey various button-clicking sensations and to experimentally evaluate its haptic performance...
March 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28367667/faster-acquisition-of-laparoscopic-skills-in-virtual-reality-with-haptic-feedback-and-3d-vision
#18
Kristine Hagelsteen, Anders Langegård, Adam Lantz, Mikael Ekelund, Magnus Anderberg, Anders Bergenfelz
BACKGROUND: The study investigated whether 3D vision and haptic feedback in combination in a virtual reality environment leads to more efficient learning of laparoscopic skills in novices. MATERIAL AND METHODS: Twenty novices were allocated to two groups. All completed a training course in the LapSim(®) virtual reality trainer consisting of four tasks: 'instrument navigation', 'grasping', 'fine dissection' and 'suturing'. The study group performed with haptic feedback and 3D vision and the control group without...
April 3, 2017: Minimally Invasive Therapy & Allied Technologies: MITAT
https://www.readbyqxmd.com/read/28366361/modified-technique-for-intrascleral-fixation-of-posterior-chamber-intraocular-lens-without-scleral-flaps
#19
Yu Zhang, Fanglin He, Jing Jiang, Qingjian Li, Zhiliang Wang
We present a modified technique for intrascleral fixation of a posterior chamber intraocular lens (IOL) without scleral flaps and assess its long-term safety and efficacy. The haptics of the IOL are externalized with a 23-gauge forceps and fixated in a scleral tunnel. Two clockwise scleral incisions are made using a 23-gauge needle at an angle 30 degrees above the sclera. A 3-piece IOL is inserted into the anterior chamber with an injector through the cornea incision, and the trailing haptic is kept outside to prevent the IOL from falling into the vitreous cavity...
February 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28360849/embodied-medicine-mens-sana-in-corpore-virtuale-sano
#20
Giuseppe Riva, Silvia Serino, Daniele Di Lernia, Enea Francesco Pavone, Antonios Dakanalis
Progress in medical science and technology drastically improved physicians' ability to interact with patient's physical body. Nevertheless, medicine still addresses the human body from a Hippocratic point of view, considering the organism and its processes just as a matter of mechanics and fluids. However, the interaction between the cognitive neuroscience of bodily self-consciousness (BSC), fundamentally rooted in the integration of multisensory bodily inputs, with virtual reality (VR), haptic technologies and robotics is giving a new meaning to the classic Juvenal's latin dictum "Mens sana in corpore sano" (a healthy mind in a healthy body)...
2017: Frontiers in Human Neuroscience
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