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https://www.readbyqxmd.com/read/28938079/comparing-climate-sensitivity-past-and-present
#1
Eelco J Rohling, Gianluca Marino, Gavin L Foster, Philip A Goodwin, Anna S von der Heydt, Peter Köhler
Climate sensitivity represents the global mean temperature change caused by changes in the radiative balance of climate; it is studied for both present/future (actuo) and past (paleo) climate variations, with the former based on instrumental records and/or various types of model simulations. Paleo-estimates are often considered informative for assessments of actuo-climate change caused by anthropogenic greenhouse forcing, but this utility remains debated because of concerns about the impacts of uncertainties, assumptions, and incomplete knowledge about controlling mechanisms in the dynamic climate system, with its multiple interacting feedbacks and their potential dependence on the climate background state...
September 22, 2017: Annual Review of Marine Science
https://www.readbyqxmd.com/read/28935857/sensorimotor-computation-underlying-phototaxis-in-zebrafish
#2
Sébastien Wolf, Alexis M Dubreuil, Tommaso Bertoni, Urs Lucas Böhm, Volker Bormuth, Raphaël Candelier, Sophia Karpenko, David G C Hildebrand, Isaac H Bianco, Rémi Monasson, Georges Debrégeas
Animals continuously gather sensory cues to move towards favourable environments. Efficient goal-directed navigation requires sensory perception and motor commands to be intertwined in a feedback loop, yet the neural substrate underlying this sensorimotor task in the vertebrate brain remains elusive. Here, we combine virtual-reality behavioural assays, volumetric calcium imaging, optogenetic stimulation and circuit modelling to reveal the neural mechanisms through which a zebrafish performs phototaxis, i.e...
September 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28934291/emotional-metacontrol-of-attention-top-down-modulation-of-sensorimotor-processes-in-a-robotic-visual-search-task
#3
Marwen Belkaid, Nicolas Cuperlier, Philippe Gaussier
Emotions play a significant role in internal regulatory processes. In this paper, we advocate four key ideas. First, novelty detection can be grounded in the sensorimotor experience and allow higher order appraisal. Second, cognitive processes, such as those involved in self-assessment, influence emotional states by eliciting affects like boredom and frustration. Third, emotional processes such as those triggered by self-assessment influence attentional processes. Last, close emotion-cognition interactions implement an efficient feedback loop for the purpose of top-down behavior regulation...
2017: PloS One
https://www.readbyqxmd.com/read/28930071/dynamics-of-the-ift-machinery-at-the-ciliary-tip
#4
Alexander Chien, Sheng Min Shih, Raqual Bower, Douglass Tritschler, Mary E Porter, Ahmet Yildiz
Intraflagellar transport (IFT) is essential for the elongation and maintenance of eukaryotic cilia and flagella. Due to the traffic jam of multiple trains at the ciliary tip, how IFT trains are remodeled in these turnaround zones cannot be determined by conventional imaging. Using Photogate, we visualized the full range of movement of single IFT trains and motors in Chlamydomonas flagella. Anterograde trains split apart and IFT complexes mix with each other at the tip to assemble retrograde trains. Dynein-1b is carried to the tip by kinesin-II as inactive cargo on anterograde trains...
September 20, 2017: ELife
https://www.readbyqxmd.com/read/28929974/reconstruction-and-visualization-of-large-scale-volumetric-models-of-neocortical-circuits-for-physically-plausible-in-silico-optical-studies
#5
Marwan Abdellah, Juan Hernando, Nicolas Antille, Stefan Eilemann, Henry Markram, Felix Schürmann
BACKGROUND: We present a software workflow capable of building large scale, highly detailed and realistic volumetric models of neocortical circuits from the morphological skeletons of their digitally reconstructed neurons. The limitations of the existing approaches for creating those models are explained, and then, a multi-stage pipeline is discussed to overcome those limitations. Starting from the neuronal morphologies, we create smooth piecewise watertight polygonal models that can be efficiently utilized to synthesize continuous and plausible volumetric models of the neurons with solid voxelization...
September 13, 2017: BMC Bioinformatics
https://www.readbyqxmd.com/read/28929643/demons-registration-for-in-vivo-and-deformable-laser-scanning-confocal-endomicroscopy
#6
Wei-Ming Chiew, Feng Lin, Hock Soon Seah
A critical effect found in noninvasive in vivo endomicroscopic imaging modalities is image distortions due to sporadic movement exhibited by living organisms. In three-dimensional confocal imaging, this effect results in a dataset that is tilted across deeper slices. Apart from that, the sequential flow of the imaging-processing pipeline restricts real-time adjustments due to the unavailability of information obtainable only from subsequent stages. To solve these problems, we propose an approach to render Demons-registered datasets as they are being captured, focusing on the coupling between registration and visualization...
September 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28929312/the-effect-of-hand-position-on-perceived-finger-orientation-in-left-and-right-handers
#7
Lindsey E Fraser, Laurence R Harris
In the absence of visual feedback, the perceived orientation of the fingers is systematically biased. In right-handers these biases are asymmetrical between the left and right hands in the horizontal plane and may reflect common functional postures for the two hands. Here we compared finger orientation perception in right- and left-handed participants for both hands, across various hand positions in the horizontal plane. Participants rotated a white line on a screen optically superimposed over their hand to indicate the perceived position of the finger that was rotated to one of seven orientations with the hand either aligned with the body midline, aligned with the shoulder, or displaced by twice the shoulder-to-midline distance from the midline...
September 19, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28929305/auditory-display-for-fluorescence-guided-open-brain-tumor-surgery
#8
David Black, Horst K Hahn, Ron Kikinis, Karin Wårdell, Neda Haj-Hosseini
PURPOSE: Protoporphyrin (PpIX) fluorescence allows discrimination of tumor and normal brain tissue during neurosurgery. A handheld fluorescence (HHF) probe can be used for spectroscopic measurement of 5-ALA-induced PpIX to enable objective detection compared to visual evaluation of fluorescence. However, current technology requires that the surgeon either views the measured values on a screen or employs an assistant to verbally relay the values. An auditory feedback system was developed and evaluated for communicating measured fluorescence intensity values directly to the surgeon...
September 19, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28928708/neural-patterns-of-reorganization-after-intensive-robot-assisted-virtual-reality-therapy-and-repetitive-task-practice-in-patients-with-chronic-stroke
#9
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
https://www.readbyqxmd.com/read/28925354/dynamic-representation-of-partially-occluded-objects-in-primate-prefrontal-and-visual-cortex
#10
Amber M Fyall, Yasmine El-Shamayleh, Hannah Choi, Eric Shea-Brown, Anitha Pasupathy
Successful recognition of partially occluded objects is presumed to involve dynamic interactions between brain areas responsible for vision and cognition, but neurophysiological evidence for the involvement of feedback signals is lacking. Here, we demonstrate that neurons in the ventrolateral prefrontal cortex (vlPFC) of monkeys performing a shape discrimination task respond more strongly to occluded than unoccluded stimuli. In contrast, neurons in visual area V4 respond more strongly to unoccluded stimuli...
September 19, 2017: ELife
https://www.readbyqxmd.com/read/28924628/a-recurrent-neural-model-for-proto-object-based-contour-integration-and-figure-ground-segregation
#11
Brian Hu, Ernst Niebur
Visual processing of objects makes use of both feedforward and feedback streams of information. However, the nature of feedback signals is largely unknown, as is the identity of the neuronal populations in lower visual areas that receive them. Here, we develop a recurrent neural model to address these questions in the context of contour integration and figure-ground segregation. A key feature of our model is the use of grouping neurons whose activity represents tentative objects ("proto-objects") based on the integration of local feature information...
September 19, 2017: Journal of Computational Neuroscience
https://www.readbyqxmd.com/read/28922517/effective-relief-of-pain-and-associated-symptoms-with-closed-loop-spinal-cord-stimulation-system-preliminary-results-of-the-avalon-study
#12
Marc Russo, Michael J Cousins, Charles Brooker, Nathan Taylor, Tillman Boesel, Richard Sullivan, Lawrence Poree, Nastaran Hesam Shariati, Erin Hanson, John Parker
OBJECTIVES: Conventional spinal cord stimulation (SCS) delivers a fixed-input of energy into the dorsal column. Physiologic effects such as heartbeat, respiration, spinal cord movement, and history of stimulation can cause both the perceived intensity and recruitment of stimulation to increase or decrease, with clinical consequences. A new SCS system controls stimulation dose by measuring the recruitment of fibers in the dorsal column and by using the amplitude of the evoked compound action potentials (ECAPs) to maintain stimulation within an individualized therapeutic range...
September 18, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28922126/functional-contour-following-via-haptic-perception-and-reinforcement-learning
#13
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
https://www.readbyqxmd.com/read/28919878/postural-control-in-bilateral-vestibular-failure-its-relation-to-visual-proprioceptive-vestibular-and-cognitive-input
#14
Andreas Sprenger, Jann F Wojak, Nico M Jandl, Christoph Helmchen
Patients with bilateral vestibular failure (BVF) suffer from postural and gait unsteadiness with an increased risk of falls. The aim of this study was to elucidate the differential role of otolith, semicircular canal (SSC), visual, proprioceptive, and cognitive influences on the postural stability of BVF patients. Center-of-pressure displacements were recorded by posturography under six conditions: target visibility; tonic head positions in the pitch plane; horizontal head shaking; sensory deprivation; dual task; and tandem stance...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28916470/receptive-field-properties-of-cat-perigeniculate-neurons-correlate-with-excitatory-and-inhibitory-connectivity-to-lgn-relay-neurons
#15
Hironobu Osaki, Tomoyuki Naito, Shogo Soma, Hiromichi Sato
The cat perigeniculate nucleus (PGN) is a visual sector of the thalamic reticular nucleus that consists of GABAergic neurons. It receives excitatory axon-collateral input from relay neurons of the dorsal lateral geniculate nucleus (LGN) to which it provides inhibitory input. Thus, it is usually argued that the PGN works as feedback inhibition to the LGN. At the single neuron level, however, this circuit can also provide lateral inhibition. Which inhibition dominates in the visual circuit of the thalamus has yet to be well characterized...
September 12, 2017: Neuroscience Research
https://www.readbyqxmd.com/read/28915986/exploration-of-gender-norms-and-socialization-among-early-adolescents-the-use-of-qualitative-methods-for-the-global-early-adolescent-study
#16
REVIEW
Kristin Mmari, Robert W Blum, Rebkha Atnafou, Elisa Chilet, Sara de Meyer, Omaima El-Gibaly, Sharmista Basu, Bamidele Bello, Beatrice Maina, Xiayun Zuo
PURPOSE: The Global Early Adolescent Study (GEAS) was launched in 2014 with the primary goal of understanding the factors in early adolescence that predispose young people to subsequent sexual risks, and conversely, those that promote healthy sexuality across different cultural contexts. The present article describes the methodology that was used for the first phase of GEAS, which consisted of conducting qualitative research to understand the gendered transitions into adolescence and the role that gender norms play within the key relationships of adolescents...
October 2017: Journal of Adolescent Health: Official Publication of the Society for Adolescent Medicine
https://www.readbyqxmd.com/read/28915097/synergies-and-motor-equivalence-in-voluntary-sway-tasks-the-effects-of-visual-and-mechanical-constraints
#17
Mariusz P Furmanek, Stanisław Solnik, Daniele Piscitelli, Omid Rasouli, Ali Falaki, Mark L Latash
The authors used two analyses developed within the framework of the uncontrolled manifold hypothesis to quantify multimuscle synergies during voluntary body sway: analysis of intertrial variance and analysis of motor equivalence with respect to the center of pressure (COP) trajectory. Participants performed voluntary sway tasks in the anteroposterior direction at 0.33 and 0.66 Hz. Muscle groups were identified in the space of muscle activations and used as elemental variables in the synergy analyses. Changing mechanical and vision feedback-based constraints led to significant changes in indices of sway performance such as COP deviations in the uninstructed, mediolateral direction and indices of spontaneous postural sway...
September 15, 2017: Journal of Motor Behavior
https://www.readbyqxmd.com/read/28910624/a-sensorimotor-circuit-in-mouse-cortex-for-visual-flow-predictions
#18
Marcus Leinweber, Daniel R Ward, Jan M Sobczak, Alexander Attinger, Georg B Keller
The cortex is organized as a hierarchical processing structure. Feedback from higher levels of the hierarchy, known as top-down signals, have been shown to be involved in attentional and contextual modulation of sensory responses. Here we argue that top-down input to the primary visual cortex (V1) from A24b and the adjacent secondary motor cortex (M2) signals a prediction of visual flow based on motor output. A24b/M2 sends a dense and topographically organized projection to V1 that targets most neurons in layer 2/3...
September 13, 2017: Neuron
https://www.readbyqxmd.com/read/28910542/effect-of-monochromatic-light-on-circadian-rhythmic-expression-of-clock-genes-and-arylalkylamine-n-acetyltransferase-in-chick-retina
#19
Jing Cao, Jiang Bian, Zixu Wang, Yulan Dong, Yaoxing Chen
Birds have more developed visual function. They not only have the ability to detect light and darkness but also have the color vision. Previous study showed that monochromatic light influenced avian physiological processes, which were controlled by clock genes. Therefore, bird's eye is a good model to studying the impact of color of light on circadian rhythms. Avian retina is one of the most important central oscillations. The study was designed to investigate the effect of color of light on the expression of clock genes and arylalkylamine N-acetyltransferase (Aanat) mRNA expression in chick retina...
September 14, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28904102/stability-of-hand-force-production-i-hand-level-control-variables-and-multi-finger-synergies
#20
Sasha Reschechtko, Mark L Latash
We combined the theory of neural control of movement with referent coordinates and the uncontrolled manifold hypothesis to explore synergies stabilizing the hand action in accurate four-finger pressing tasks. In particular, we tested a hypothesis on two classes of synergies - those among the four fingers and those within a pair of control variables - stabilizing hand action under visual feedback and disappearing without visual feedback. Subjects performed four-finger total force and moment production tasks under visual feedback; the feedback was later partially or completely removed...
September 13, 2017: Journal of Neurophysiology
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