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https://www.readbyqxmd.com/read/28719661/minimizing-endpoint-variability-through-reinforcement-learning-during-reaching-movements-involving-shoulder-elbow-and-wrist
#1
David Marc Anton Mehler, Alexandra Reichenbach, Julius Klein, Jörn Diedrichsen
Reaching movements are comprised of the coordinated action across multiple joints. The human skeleton is redundant for this task because different joint configurations can lead to the same endpoint in space. How do people learn to use combinations of joints that maximize success in goal-directed motor tasks? To answer this question, we used a 3-degree-of-freedom manipulandum to measure shoulder, elbow and wrist joint movements during reaching in a plane. We tested whether a shift in the relative contribution of the wrist and elbow joints to a reaching movement could be learned by an implicit reinforcement regime...
2017: PloS One
https://www.readbyqxmd.com/read/28718780/biarticular-elements-as-a-contributor-to-energy-efficiency-biomechanical-review-and-application-in-bio-inspired-robotics
#2
Karen Junius, Marta Moltedo, Pierre Cherelle, Carlos David Rodriguez-Guerrero, Bram Vanderborght, Dirk Lefeber
Despite the increased interest in exoskeleton research in the last decades, not much progress has been made on the successful reduction of user effort. In humans, biarticular elements have been identied as one of the reasons for the energy economy of locomotion. This document gives an extensive literature overview concerning the function of biarticular mus- cles in human beings. The exact role of these muscles in the efficiency of human locomotion is reduced to three elementary functions: energy transfer towards distal joints, efficient control of output force direction and double joint actuation...
July 18, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/28715322/optimal-mixed-tracking-impedance-control-with-application-to-transfemoral-prostheses-with-energy-regeneration
#3
Gholamreza Khademi, Hanieh Mohammadi, Hanz Richter, Dan Simon
OBJECTIVE: We design an optimal passivity-based tracking / impedance control system for a robotic manipulator with energy regenerative electronics, where the manipulator has both actively and semi-actively controlled joints. The semi-active joints are driven by a regenerative actuator that includes an energy-storing element. METHOD: External forces can have a large influence on energy regeneration characteristics. Impedance control is used to impose a desired relationship between external forces and deviation from reference trajectories...
July 13, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28712922/utilization-of-manipulative-treatment-for-spine-and-shoulder-conditions-between-different-medical-providers-in-a-large-military-hospital
#4
Daniel Rhon, Tina Greenleee, Julie Fritz
OBJECTIVE: Describe the use of manipulative treatment for shoulder and spine conditions between various provider types. DESIGN: Retrospective observational cohort SETTING: Single military hospital PARTICIPANTS: Consecutive sample of 7,566 patients seeking care for an initial spine or shoulder condition from 1 January to 31 December 2009. INTERVENTIONS: Manipulative treatment (e.g. manual therapy, spinal and joint manipulation, etc). MAIN OUTCOME MEASURE: Manipulation treatment was identified with procedure billing codes in medical records...
July 13, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28699122/improved-information-pooling-for-hierarchical-cognitive-models-through-multiple-and-covaried-regression
#5
R Anders, Z Oravecz, F-X Alario
Cognitive process models are fit to observed data to infer how experimental manipulations modify the assumed underlying cognitive process. They are alternatives to descriptive models, which only capture differences on the observed data level, and do not make assumptions about the underlying cognitive process. Process models may require more observations than descriptive models however, and as a consequence, usually fewer conditions can be simultaneously modeled with them. Unfortunately, it is known that the predictive validity of a model may be compromised when fewer experimental conditions are jointly accounted for (e...
July 11, 2017: Behavior Research Methods
https://www.readbyqxmd.com/read/28695348/acquisition-of-joint-attention-by-olive-baboons-gesturing-toward-humans
#6
Augustine Lamaury, Hélène Cochet, Marie Bourjade
Joint attention is a core ability of human social cognition which broadly refers to the coordination of attention with both the presence and activity of social partners. In both human and non-human primates, joint attention can be assessed from behaviour; gestures and gaze alternation between the partner and a distal object are standard behavioural manifestations of joint attention. Here we examined the acquisition of joint attention in olive baboons as a function of their individual experience of a human partner's attentional states during training regimes...
July 10, 2017: Animal Cognition
https://www.readbyqxmd.com/read/28686298/predatory-birds-and-ants-partition-caterpillar-prey-by-body-size-and-diet-breadth
#7
M S Singer, R E Clark, I H Lichter-Marck, E R Johnson, K A Mooney
1.The effects of predator assemblages on herbivores are predicted to depend critically on predator-predator interactions and the extent to which predators partition prey resources. The role of prey heterogeneity in generating such multiple predator effects has received limited attention. 2.Vertebrate and arthropod insectivores constitute two co-dominant predatory taxa in many ecosystems, and the emergent properties of their joint effects on insect herbivores inform theory on multiple predator effects as well as biological control of insect herbivores...
July 7, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28684625/wnt-signalling-controls-the-response-to-mechanical-loading-during-zebrafish-joint-development
#8
L H Brunt, K Begg, E Kague, S Cross, C L Hammond
Joint morphogenesis requires mechanical activity during development. Loss of mechanical strain causes abnormal joint development, which can impact long term joint health. While cell orientation and proliferation are known to shape the joint, dynamic imaging of developing joints in vivo has not been possible in other species. Using genetic labelling techniques in zebrafish we were able, for the first time, to dynamically track cell behaviours in intact moving joints. We identify that proliferation and migration, which contribute to joint morphogenesis, are mechanically controlled and are significantly reduced in immobilised larvae...
July 6, 2017: Development
https://www.readbyqxmd.com/read/28683980/midterm-survivorship-and-complications-of-total-knee-arthroplasty-in-patients-with-dwarfism
#9
Timothy L Tan, Michael M Kheir, Ronuk Modi, Chi-Lung Chen, Hongyi Shao, Antonia F Chen
BACKGROUND: Dwarfism is associated with skeletal dysplasias and joint deformities that frequently result in osteoarthritis requiring treatment with total knee arthroplasty (TKA). These surgeries can be challenging because of alignment deformities, poor bone stock, and smaller components. This study aims to compare TKA implant survivorship and complications between dwarf and nondwarf patients. METHODS: A retrospective case-control study was performed from 1997-2014 evaluating 115 TKAs in patients under the height threshold of 147...
June 9, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28676750/multi-trial-gait-adaptation-of-healthy-individuals-during-visual-kinematic-perturbations
#10
Trieu Phat Luu, Yongtian He, Sho Nakagome, Kevin Nathan, Samuel Brown, Jeffrey Gorges, Jose L Contreras-Vidal
Optimizing rehabilitation strategies requires understanding the effects of contextual cues on adaptation learning. Prior studies have examined these effects on the specificity of split-belt walking adaptation, showing that contextual visual cues can be manipulated to modulate the magnitude, transfer, and washout of split-belt-induced learning in humans. Specifically, manipulating the availability of vision during training or testing phases of learning resulted in differences in adaptive mechanisms for temporal and spatial features of walking...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28670295/cooperative-behavior-in-the-ultimatum-game-and-prisoner-s-dilemma-depends-on-players-contributions
#11
Amy R Bland, Jonathan P Roiser, Mitul A Mehta, Thea Schei, Barbara J Sahakian, Trevor W Robbins, Rebecca Elliott
Economic games such as the Ultimatum Game (UG) and Prisoner's Dilemma (PD) are widely used paradigms for studying fairness and cooperation. Monetary versions of these games involve two players splitting an arbitrary sum of money. In real life, however, people's propensity to engage in cooperative behavior depends on their effort and contribution; factors that are well known to affect perceptions of fairness. We therefore sought to explore the impact of relative monetary contributions by players in the UG and PD...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28660676/manipulator-driven-selection-of-semi-active-mr-visible-markers
#12
Junmo An, Andrew G Webb, Dipan J Shah, Karen Chin, Nikolaos V Tsekos
BACKGROUND: A method for the identification of semi-active fiducial magnetic resonance (MR) markers is presented based on selectively optically tuning and detuning them. METHODS: Four inductively coupled solenoid coils with photoresistors were connected to light sources. A microcontroller timed the optical tuning/detuning of coils and image collection. The markers were tested on an MR manipulator linking the microcontroller to the manipulator control to visibly select the marker subset according to the actuated joint...
June 29, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/28645452/thrust-magnitudes-rates-and-3-dimensional-directions-delivered-in-simulated-lumbar-spine-high-velocity-low-amplitude-manipulation
#13
Edward F Owens, Ronald S Hosek, Linda Mullin, Lydia Dever, Stephanie G B Sullivan, Brent S Russell
OBJECTIVES: The purpose of this study was to measure faculty performance of simulated spinal manipulation on a mannequin to help identify teaching standards. METHODS: We measured 3-dimensional transmitted loads using a force plate mounted in the table. Thrusts were delivered through a compliant, jointed mannequin by faculty members along predefined "listings" as taught in lumbopelvic technique courses. RESULTS: Eleven chiropractic faculty members participated, delivering 9 thrusts at 3 loads (light, moderate, and heavy) along 9 different prone and side-posture listings, totaling 81 thrusts per participant...
June 20, 2017: Journal of Manipulative and Physiological Therapeutics
https://www.readbyqxmd.com/read/28644636/path-controlled-time-reordering-of-paired-photons-in-a-dressed-three-level-cascade
#14
Samir Bounouar, Max Strauß, Alexander Carmele, Peter Schnauber, Alexander Thoma, Manuel Gschrey, Jan-Hindrik Schulze, André Strittmatter, Sven Rodt, Andreas Knorr, Stephan Reitzenstein
The two-photon dressing of a "three-level ladder" system, here the ground state, the exciton, and the biexciton of a semiconductor quantum dot, leads to new eigenstates and allows one to manipulate the time ordering of the paired photons without unitary postprocessing. We show that, after spectral postselection of the single dressed states, the time ordering of the cascaded photons can be removed or conserved. Our joint experimental and theoretical study demonstrates the high potential of a "ladder" system to be a versatile source of orthogonally polarized, bunched or antibunched pairs of photons...
June 9, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28615330/the-visual-encoding-of-purely-proprioceptive-intermanual-tasks-is-due-to-the-need-of-transforming-joint-signals-not-to-their-inter-hemispheric-transfer
#15
Léo Arnoux, Sebastien Fromentin, Dario Farotto, Mathieu Beraneck, Joseph McIntyre, Michele Tagliabue
To perform goal-oriented hand movement humans combine multiple sensory signals (e.g. vision and proprioception) that can be encoded in various reference frames (body-centered and/or exo-centered). In a previous study we showed that when aligning a hand to a remembered target orientation the brain encodes both target and response in visual space when the target is sensed by one hand and the response is performed by the other, even though both are sensed only through proprioception. Here we ask whether such visual encoding is due i) to the necessity of transferring sensory information across the brain hemispheres or ii) to the necessity, due to the arms' anatomical mirror symmetry, of transforming the joint signals of one limb into the reference frame of the other...
June 14, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28605248/noncircular-chainrings-do-not-influence-maximum-cycling-power
#16
Chee-Hoi Leong, Steven J Elmer, James C Martin
Noncircular chainrings could increase cycling power by prolonging the powerful leg extension/flexion phases, and curtailing the low-power transition phases. We compared maximal cycling power-pedaling rate relationships, and joint-specific kinematics and powers across three chainring eccentricities (CON=1.0; LOWecc=1.13; HIGHecc=1.24). Part I: Thirteen cyclists performed maximal inertial-load cycling under three chainring conditions. Maximum cycling power and optimal pedaling rate were determined. Part II: Ten cyclists performed maximal isokinetic cycling (120rpm) under the same three chainring conditions...
June 12, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28605194/discovery-of-two-bacterial-nitric-oxide-responsive-proteins-and-their-roles-in-bacterial-biofilm-regulation
#17
Sajjad Hossain, Lisa-Marie Nisbett, Elizabeth M Boon
Bacterial biofilms form when bacteria adhere to a surface and produce an exopolysaccharide matrix ( Costerton Science 1999 , 284 , 1318 ; Davies Science 1998 , 280 , 295 ; Flemming Nat. Rev. Microbiol. 2010 , 8 , 623 ). Because biofilms are resistant to antibiotics, they are problematic in many aspects of human health and welfare, causing, for instance, persistent fouling of medical implants such as catheters and artificial joints ( Brunetto Chimia 2008 , 62 , 249 ). They are responsible for chronic infections in the lungs of cystic fibrosis patients and in open wounds, such as those associated with burns and diabetes...
June 12, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28604542/outcome-of-dupuytren-contractures-after-collagenase-clostridium-histolyticum-injection-a-single-institution-experience
#18
Yin Kan Hwee, Daniel Park, Marisa Vinas, Christopher Litts, David Friedman
BACKGROUND: Collagenase clostridium histolyticum (CCH) injection is an alternative to surgery for patients with Dupuytren disease (DD) of the metacarpophalangeal (MCP) and proximal interphalangeal (PIP) joints. The success of surgical and nonsurgical treatment modalities for DD is reported to vary widely between 25% and 80% (J Bone Joint Surg Am. 1985;67:1439-1443; Plast Reconstr Surg. 2007;120:44e-54e; J Bone Joint Surg Am. 2007;89:189-198; J Hand Surg Am. 2011:36:936-942; J Hand Surg Am...
August 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/28585902/negotiating-between-individual-and-joint-goals-in-ensemble-musical-performance
#19
Jennifer MacRitchie, Steffen A Herff, Andrea Procopio, Peter E Keller
Successful joint action requires negotiation, especially in the event of goal incongruence. This paper addresses goal incongruence in joint musical performance by manipulating the congruence of score instructions (congruent/incongruent) regarding tempo (speed) and dynamics (sound intensity) given to piano duos. The aim is to investigate how co-performers negotiate incongruent instructions for tempo and dynamics by balancing the prioritisation of individual goals versus the joint outcome, and how this negotiation is modulated by musical expertise and personality (locus of control)...
June 6, 2017: Quarterly Journal of Experimental Psychology: QJEP
https://www.readbyqxmd.com/read/28579132/optimization-of-sagittal-and-coronal-planes-with-robotic-assisted-unicompartmental-knee-arthroplasty
#20
Michael A Gaudiani, Benedict U Nwachukwu, Jayesh V Baviskar, Mrinal Sharma, Anil S Ranawat
BACKGROUND: One of the anatomic goals of total knee arthroplasty (TKA) is optimizing in the coronal and sagittal plane. Accurate alignments of both planes have been correlated to functional outcome and range of motion. There is a paucity of evidence on the accuracy of unicompartmental knee arthroplasty (UKA) in balancing biplanar knee alignment - specifically sagittal plane alignment. Because robotic assisted UKA has an advantage of more accurately manipulating sagittal plane for optimal alignment and kinematics based on pre-operative and intraoperative CT planning we assessed the accuracy...
June 1, 2017: Knee
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