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https://www.readbyqxmd.com/read/28813791/codification-mechanisms-of-wrist-position-sense
#1
Francesca Marini, Sara Contu, Pietro Morasso, Lorenzo Masia, Jacopo Zenzeri
Proprioceptive signals from cutaneous, joint, tendon and muscle receptors create the basis for bodily perception and are known to be essential for motor control. However, which are the mechanisms underlying the proprioceptive signals and which are the variables that affect them is still a matter of debate. In particular, what is worth to investigate is, namely, the codification of proprioceptive information related to pointing movements of the wrist towards kinesthetic targets. In this work we asked 10 healthy adults to perform with their wrist a robot-aided proprioceptive matching task, in which the starting position of the matching movements was shifted forward or backward, in order to ascertain to which extent such shifts cause target over/under estimation and how important is movement's length on task performance...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28811835/mental-health-care-providers-perceptions-of-the-barriers-to-suicide-prevention-amongst-people-with-substance-use-disorders-in-south-africa-a-qualitative-study
#2
Daniel Goldstone, Jason Bantjes
BACKGROUND: Substance use is a well-established, and potentially modifiable, risk factor for suicide. Suicide prevention interventions are typically framed within the biomedical paradigm and focus on addressing individual risk factors, improving access to psychiatric care, and improving the skills of medical personnel to recognise at-risk individuals. Few studies have focused on contextual factors that hinder suicide prevention in people with substance use disorders, particularly in low-resource settings...
2017: International Journal of Mental Health Systems
https://www.readbyqxmd.com/read/28811178/acute-%C3%AE-9-tetrahydrocannabinol-administration-in-female-rats-attenuates-immediate-responses-following-losses-but-not-multi-trial-reinforcement-learning-from-wins
#3
Scott A Wong, Sienna H Randolph, Victorita E Ivan, Aaron J Gruber
Δ-9-tetrahydrocannabinol (THC) is the main psychoactive component of marijuana and has potent effects on decision-making, including a proposed reduction in cognitive flexibility. We demonstrate here that acute THC administration differentially affects some of the processes that contribute to cognitive flexibility. Specifically, THC reduces lose-shift responding in which female rats tend to immediately shift choice responses away from options that result in reward omission on the previous trial. THC, however, did not impair the ability of rats to flexibly bias responses toward feeders with higher probability of reward in a reversal task...
August 12, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28811112/exogenous-testosterone-affects-early-threat-processing-in-socially-anxious-and-healthy-women
#4
Jacobien M van Peer, Dorien Enter, Henk van Steenbergen, Philip Spinhoven, Karin Roelofs
Testosterone plays an important role in social threat processing. Recent evidence suggests that testosterone administration has socially anxiolytic effects, but it remains unknown whether this involves early vigilance or later, more sustained, processing-stages. We investigated the acute effects of testosterone administration on social threat processing in 19 female patients with Social Anxiety Disorder (SAD) and 19 healthy controls. Event-related potentials (ERPs) were recorded during an emotional Stroop task with subliminally presented faces...
August 12, 2017: Biological Psychology
https://www.readbyqxmd.com/read/28810170/the-role-of-speed-and-incline-in-the-spontaneous-choice-of-technique-in-classical-roller-skiing
#5
Gertjan Ettema, Espen Kveli, Magne Øksnes, Øyvind Sandbakk
Cross-country skiers change technique depending on terrain (incline) and effort (work rate; speed at a particular incline or resistance). The literature is not unequivocal about the influence of incline or speed on the choice of technique, i.e., which of these act as a 'control parameter'. Identifying task related control parameters for spontaneous technique shifts assists elucidating which mechanisms are active for triggering technique transitions. The aim of this study was to investigate whether speed or incline acted as such control parameter for technique shifts during classic style roller skiing...
August 12, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28809193/patient-at-work-in-the-era-of-pro
#6
Ann Bygholm, Pernille Bertelsen
There is a widespread consensus that it is important to involve patient in their own care, both for the reasons of quality and safety in healthcare and for the sake of the patients' individual rights. The appreciation of patient participation and related notions such as patient empowerment, patient centered care, patient involvement, patient as co-producers of health et cetera, indicate that the role of the patient have changed over the last decades. It has changed from being a passive recipient of treatment to becoming an active and responsible agent...
2017: Studies in Health Technology and Informatics
https://www.readbyqxmd.com/read/28808252/altered-awareness-of-action-in-parkinson-s-disease-evaluations-by-explicit-and-implicit-measures
#7
Naho Saito, Keisuke Takahata, Hodaka Yamakado, Nobukatsu Sawamoto, Satoshi Saito, Ryosuke Takahashi, Toshiya Murai, Hidehiko Takahashi
Deficits in the integration of motor prediction and its feedback have been reported in Parkinson's disease. Conscious awareness of action is proposed to emerge under the integration of motor prediction and its feedback. Thus, it may lead to changes in the awareness of the authorship of action (in other words, the sense of agency) in Parkinson's disease. We have employed both explicit and implicit measures to assess the awareness of action in Parkinson's disease and matched controls. As an explicit measure, an action recognition task requiring explicit judgments was used...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28807788/adolescent-binge-ethanol-exposure-alters-specific-forebrain-cholinergic-cell-populations-and-leads-to-selective-functional-deficits-in-the-prefrontal-cortex
#8
Gina M Fernandez, Lisa M Savage
Adolescence has been identified as a vulnerable developmental time period during which exposure to drugs can have long-lasting, detrimental effects. Although adolescent binge-like ethanol (EtOH) exposure leads to a significant reduction of forebrain cholinergic neurons, EtOH's functional effect on acetylcholine (ACh) release during behavior has yet to be examined. Using an adolescent intermittent ethanol exposure model (AIE), rats were exposed to binge-like levels of EtOH from postnatal day (PD) 25-55. Three weeks following the final EtOH exposure, cholinergic functioning was assessed during a spontaneous alternation protocol...
August 11, 2017: Neuroscience
https://www.readbyqxmd.com/read/28803883/the-provision-of-emergency-contraception-in-kinshasa-s-private-sector-pharmacies-experiences-of-mystery-clients
#9
Julie H Hernandez, Mbadu Muanda Fidèle, Mélissa Garcia, Annie Glover
OBJECTIVES: Recent programmatic and research efforts on addressing gaps in health systems of low-income countries increasingly see task shifting, i.e. the provision of healthcare by non-medically trained personnel, as a possible solution to increase the availability of specific services and commodities. In Kinshasa, private-sector pharmacies are the primary and preferred provider of family planning (FP) methods, and thus constitute a potential resource for expanding access to specific contraceptives...
August 10, 2017: Contraception
https://www.readbyqxmd.com/read/28803526/familiarity-and-within-person-facial-variability-the-importance-of-the-internal-and-external-features
#10
Robin S S Kramer, Zoi Manesi, Alice Towler, Michael G Reynolds, A Mike Burton
As faces become familiar, we come to rely more on their internal features for recognition and matching tasks. Here, we assess whether this same pattern is also observed for a card sorting task. Participants sorted photos showing either the full face, only the internal features, or only the external features into multiple piles, one pile per identity. In Experiments 1 and 2, we showed the standard advantage for familiar faces-sorting was more accurate and showed very few errors in comparison with unfamiliar faces...
January 1, 2017: Perception
https://www.readbyqxmd.com/read/28802444/identifying-the-critical-physical-demanding-tasks-of-paramedic-work-towards-the-development-of-a-physical-employment-standard
#11
Steven L Fischer, Kathryn E Sinden, Renee S MacPhee
Public safety related occupations including police, fire and military commonly apply physical employment standard (PES) to facilitate job matching, an approach to evaluate if candidates demonstrate acceptable physical capabilities as required to perform the job safely and effectively. In Canada, paramedics remain as one of the few public safety occupations without an evidence-based, validated PES. The purpose of this study was to document and describe the physical demands of paramedic work and to identify the most physically demanding tasks...
November 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28802428/changes-in-trunk-sway-of-quay-crane-operators-during-work-shift-a-possible-marker-for-fatigue
#12
Bruno Leban, Gianfranco Fancello, Paolo Fadda, Massimiliano Pau
This study investigated changes in task-induced trunk sway of quay crane operators during a four-hour shift performed in a dedicated simulator as an indicator of postural control system effectiveness. Using a pressure sensitive mat placed on the seat pan, center-of-pressure (COP) time series were acquired and processed to calculate sway area, path length and COP displacements and velocities. The results show a well-defined linear trend for sway path and area, with significant increases starting from 65 to 155 min of work respectively...
November 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28800369/feature-singletons-attract-spatial-attention-independently-of-feature-priming
#13
Amit Yashar, Alex L White, Wanghaoming Fang, Marisa Carrasco
People perform better in visual search when the target feature repeats across trials (intertrial feature priming [IFP]). Here, we investigated whether repetition of a feature singleton's color modulates stimulus-driven shifts of spatial attention by presenting a probe stimulus immediately after each singleton display. The task alternated every two trials between a probe discrimination task and a singleton search task. We measured both stimulus-driven spatial attention (via the distance between the probe and singleton) and IFP (via repetition of the singleton's color)...
August 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28797600/the-rat-retrosplenial-cortex-as-a-link-for-frontal-functions-a-lesion-analysis
#14
Anna L Powell, Andrew Nelson, Emma Hindley, Moira Davies, John P Aggleton, Seralynne D Vann
Cohorts of rats with excitotoxic retrosplenial cortex lesions were tested on four behavioural tasks sensitive to dysfunctions in prelimbic cortex, anterior cingulate cortex, or both. In this way the study tested whether retrosplenial cortex has nonspatial functions that reflect its anatomical interactions with these frontal cortical areas. In Experiment 1, retrosplenial cortex lesions had no apparent effect on a set-shifting digging task that taxed intradimensional and extradimensional attention, as well as reversal learning...
August 7, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28797595/effects-of-motion-segment-simulation-and-joint-positioning-on-spinal-loads-in-trunk-musculoskeletal-models
#15
F Ghezelbash, A H Eskandari, A Shirazi-Adl, N Arjmand, Z El-Ouaaid, A Plamondon
Musculoskeletal models represent spinal motion segments by spherical joints/beams with linear/nonlinear properties placed at various locations. We investigated the fidelity of these simplified models (i.e., spherical joints with/without rotational springs and beams considering nonlinear/linear properties) in predicting kinematics of the ligamentous spine in comparison with a detailed finite element (FE) model while considering various anterior-posterior joint placements. Using the simplified models with different joint offsets in a subject-specific musculoskeletal model, we computed local spinal forces during forward flexion and compared results with intradiscal pressure measurements...
July 25, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28791601/analysis-of-timing-variability-in-human-movements-by-aligning-parameter-curves-in-time
#16
Lisa K Maurer, Heiko Maurer, Hermann Müller
The analysis of timing in human movements requires a reference with which timing can be quantified. In reactive movements this reference is given by the stimulus. However, many movements do not respond to such an external event. In throwing, for instance, the hand opening for release has to be timed to an acceleration of the throwing arm. A common approach to analyzing release-timing variability is to choose a landmark in the movement that is supposed to have a fixed temporal relation to the release. Such distinct landmarks, however, are not always well definable...
August 8, 2017: Behavior Research Methods
https://www.readbyqxmd.com/read/28790188/noradrenergic-activation-of-the-basolateral-amygdala-maintains-hippocampus-dependent-accuracy-of-remote-memory
#17
Erika Atucha, Vanja Vukojevic, Raquel V Fornari, Giacomo Ronzoni, Philippe Demougin, Fabian Peter, Piray Atsak, Marcel W Coolen, Andreas Papassotiropoulos, James L McGaugh, Dominique J-F de Quervain, Benno Roozendaal
Emotional enhancement of memory by noradrenergic mechanisms is well-described, but the long-term consequences of such enhancement are poorly understood. Over time, memory traces are thought to undergo a neural reorganization, that is, a systems consolidation, during which they are, at least partly, transferred from the hippocampus to neocortical networks. This transfer is accompanied by a decrease in episodic detailedness. Here we investigated whether norepinephrine (NE) administration into the basolateral amygdala after training on an inhibitory avoidance discrimination task, comprising two distinct training contexts, alters systems consolidation dynamics to maintain episodic-like accuracy and hippocampus dependency of remote memory...
August 8, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28782004/second-flexner-century-the-democratization-of-medical-knowledge-repurposing-a-general-pathology-course-into-multigrade-level-gateway-courses
#18
Ronald S Weinstein, Amy L Waer, John B Weinstein, Margaret M Briehl, Michael J Holcomb, Kristine A Erps, Angelette L Holtrust, Julie M Tomkins, Gail P Barker, Elizabeth A Krupinski
Starting in 1910, the "Flexner Revolution" in medical education catalyzed the transformation of the US medical education enterprise from a proprietary medical school dominated system into a university-based medical school system. In the 21st century, what we refer to as the "Second Flexner Century" shifts focus from the education of medical students to the education of the general population in the "4 health literacies." Compared with the remarkable success of the first Flexner Revolution, retrofitting medical science education into the US general population today, starting with K-12 students, is a more daunting task...
January 2017: Acad Pathol
https://www.readbyqxmd.com/read/28780143/imaging-the-potential-distribution-of-individual-charged-impurities-on-graphene-by-low-energy-electron-holography
#19
Tatiana Latychevskaia, Flavio Wicki, Conrad Escher, Hans-Werner Fink
While imaging individual atoms can routinely be achieved in high resolution transmission electron microscopy, visualizing the potential distribution of individually charged adsorbates leading to a phase shift of the probing electron wave is still a challenging task. Low-energy electrons (30 - 250 eV) are sensitive to localized potential gradients. We employed low-energy electron holography to acquire in-line holograms of individual charged impurities on free-standing graphene. By applying an iterative phase retrieval reconstruction routine we recover the potential distribution of the localized charged impurities present on free-standing graphene...
July 29, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28775332/temporally-robust-eye-movements-through-task-priming-and-self-referential-stimuli
#20
Eun-Soo Jung, Dong-Gun Lee, Kyeongho Lee, Soo-Young Lee
Studies have demonstrated connections between eye movements and attention shifts. However, little is known about the general factors that contribute to the self-consistency of idiosyncratic scanpaths as a function of attention shifts over time. The present work repeatedly measured human eye movements at various time intervals that ranged from less than one hour to one year between recording sessions. With and without task context, subjects observed multiple images with multiple areas of interest, including their own sporadically interspersed facial images...
August 3, 2017: Scientific Reports
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