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https://www.readbyqxmd.com/read/28576778/what-the-snp-plaid-cymru-the-dup-and-sinn-fein-are-promising-the-nhs
#1
Andy Cowper
No abstract text is available yet for this article.
June 2, 2017: BMJ: British Medical Journal
https://www.readbyqxmd.com/read/28574052/-aneurysm-of-the-gastroduodenal-artery-in-a-female-patient-with-the-postcholecystectomy-syndrome-a-clinical-case-report
#2
A E Shkliaev, A G Bessonov, Iu V Gorbunov, O V Muravtseva, K B Klestov, S Iu Zykov
Aneurysms of visceral arteries appear to belong to rare and potentially lethal vascular diseases. The most important role in the aetiology of aneurysms of the gastroduodenal artery is plaid by either acute or chronic pancreatitis. The article deals with a clinical case report concerning a saccular partially thrombosed aneurysm having developed in a 77-year-old woman presenting with the postcholecystectomic syndrome and detected on ultrasonographic examination of the abdominal-cavity vessels. Timely radiodiagnosis (SCT angiography of abdominal cavity vessels), adequate and timely performed endovascular occlusion of the cavity of the aneurysm with metal spirals performed in a timely manner made it possible to attain a favourable outcome...
2017: Angiologii︠a︡ i Sosudistai︠a︡ Khirurgii︠a︡, Angiology and Vascular Surgery
https://www.readbyqxmd.com/read/28567268/measuring-early-cortical-visual-processing-in-the-clinic
#3
Linda Bowns, William H A Beaudot
We describe a mobile app that measures early cortical visual processing suitable for use in clinics. The app is called Component Extraction and Motion Integration Test (CEMIT). Observers are asked to respond to the direction of translating plaids that move in one of two very different directions. The plaids have been selected so that the plaid components move in one of the directions and the plaid pattern moves in the other direction. In addition to correctly responding to the pattern motion, observers demonstrate their ability to correctly extract the movement (and therefore the orientation) of the underlying components at specific spatial frequencies...
May 2017: I-Perception
https://www.readbyqxmd.com/read/28538990/measuring-nonlinear-signal-combination-using-eeg
#4
Darren G M Cunningham, Daniel H Baker, Jonathan W Peirce
Relatively little is known about the processes, both linear and nonlinear, by which signals are combined beyond V1. By presenting two stimulus components simultaneously, flickering at different temporal frequencies (frequency tagging) while measuring steady-state visual evoked potentials, we can assess responses to the individual components, including direct measurements of suppression on each other, and various nonlinear responses to their combination found at intermodulation frequencies. The result is a rather rich dataset of frequencies at which responses can be found...
May 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28479403/normal-aging-slows-spontaneous-switching-in-auditory-and-visual-bistability
#5
Hirohito M Kondo, Takanori Kochiyama
Age-related changes in auditory and visual perception have an impact on the quality of life. It has been debated how perceptual organization is influenced by advancing age. From the neurochemical perspective, we investigated age effects on auditory and visual bistability. In perceptual bistability, a sequence of sensory inputs induces spontaneous switching between different perceptual objects. We used different modality tasks of auditory streaming and visual plaids. Young and middle-aged participants (20-60years) were instructed to indicate by a button press whenever their perception changed from one stable state to the other...
May 4, 2017: Neuroscience
https://www.readbyqxmd.com/read/28355633/combining-1-d-components-to-extract-pattern-information-it-is-about-more-than-component-similarity
#6
Christian Quaia, Lance M Optican, Bruce G Cumming
At least under some conditions, plaid stimuli are processed by combining information first extracted in orientation and scale-selective channels. The rules that govern this combination across channels are only partially understood. Although the available data suggests that only components having similar spatial frequency and contrast are combined, the extent to which this holds has not been firmly established. To address this question, we measured, in human subjects, the short-latency reflexive vergence eye movements induced by stereo plaids in which spatial frequency and contrast of the components are independently varied...
March 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28053039/complex-visual-motion-representation-in-mouse-area-v1
#7
Ganna Palagina, Jochen F Meyer, Stelios M Smirnakis
Rodent visual cortex has a hierarchical architecture similar to that of higher mammals (Coogan and Burkhalter, 1993; Marshel et al., 2011; Wang et al., 2012). Although notable differences exist between the species in terms or receptive field sizes and orientation map organization (Dräger, 1975; Gattass et al., 1987; Van den Bergh et al., 2010), mouse V1 is thought to respond to local orientation and visual motion elements rather than to global patterns of motion, similar to V1 in higher mammals (Niell and Stryker, 2008; Bonin et al...
January 4, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27940075/decoding-eye-of-origin-outside-of-awareness
#8
Daniel H Baker
In the primary visual cortex of many mammals, ocular dominance columns segregate information from the two eyes. Yet under controlled conditions, most human observers are unable to correctly report the eye to which a stimulus has been shown, indicating that this information is lost during subsequent processing. This study investigates whether eye-of-origin information is available in the pattern of electrophysiological activity evoked by visual stimuli, recorded using EEG and decoded using multivariate pattern analysis...
February 15, 2017: NeuroImage
https://www.readbyqxmd.com/read/27936270/the-relative-contribution-of-noise-and-adaptation-to-competition-during-tri-stable-motion-perception
#9
Andrew Isaac Meso, James Rankin, Olivier Faugeras, Pierre Kornprobst, Guillaume S Masson
Animals exploit antagonistic interactions for sensory processing and these can cause oscillations between competing states. Ambiguous sensory inputs yield such perceptual multistability. Despite numerous empirical studies using binocular rivalry or plaid pattern motion, the driving mechanisms behind the spontaneous transitions between alternatives remain unclear. In the current work, we used a tristable barber pole motion stimulus combining empirical and modeling approaches to elucidate the contributions of noise and adaptation to underlying competition...
December 1, 2016: Journal of Vision
https://www.readbyqxmd.com/read/27871885/vestibular-signals-of-self-motion-modulate-global-motion-perception
#10
Hinze Hogendoorn, Frans A J Verstraten, Hamish MacDougall, David Alais
Certain visual stimuli can have two possible interpretations. These perceptual interpretations may alternate stochastically, a phenomenon known as bistability. Some classes of bistable stimuli, including binocular rivalry, are sensitive to bias from input through other modalities, such as sound and touch. Here, we address the question whether bistable visual motion stimuli, known as plaids, are affected by vestibular input that is caused by self-motion. In Experiment 1, we show that a vestibular self-motion signal biases the interpretation of the bistable plaid, increasing or decreasing the likelihood of the plaid being perceived as globally coherent or transparently sliding depending on the relationship between self-motion and global visual motion directions...
January 2017: Vision Research
https://www.readbyqxmd.com/read/27826408/perceived-speed-of-compound-stimuli-is-moderated-by-component-contrast-not-overall-pattern-contrast
#11
Kevin R Brooks, Peter Thompson
The perception of speed is susceptible to manipulations of image contrast, both for simple sine wave and more complex stimuli, such that low-contrast patterns generally appear slower than their high-contrast equivalents. It is not known whether the crucial factor is the contrast of the underlying Fourier components or the contrast of the overall complex pattern. Here, two experiments investigate this issue using compound gratings, comprising two vertical sine wave stimuli with equal contrast, but a 3:1 spatial frequency ratio...
September 2016: I-Perception
https://www.readbyqxmd.com/read/27822354/the-whole-is-other-than-the-sum-perceived-contrast-summation-within-color-and-luminance-plaids
#12
Avital S Cherniawsky, Kathy T Mullen
The apparent contrast of a plaid is a reflection of the neural relationship between the responses to its two orthogonal component gratings. To investigate the perceived contrast summation of the responses to component gratings in plaids, we compared the apparent contrasts of monocular plaids to a component grating presented alone across chromaticity and spatial frequency. Observers performed a contrast-matching task for red-green color and luminance stimuli at low- and medium-spatial frequencies. Using the measured points of subjective equality between plaids and gratings, we evaluate perceived contrast summation across conditions, which may vary between 1 (no summation) and 2 (full summation)...
September 2016: I-Perception
https://www.readbyqxmd.com/read/27764119/contrast-gain-control-in-plaid-pattern-detection
#13
Pi-Chun Huang, Chien-Chung Chen
A plaid is a combination of two gratings whose orientations are orthogonal to each other with the same or similar contrasts. We used plaid patterns as stimuli to investigate the mechanisms underlying the detection of a plaid to understand how the visual system combines information from orientation-selective channels. We used a masking paradigm in which an observer was required to detect a target (either a spiral or a plaid) superimposed on a pedestal. We measured the target threshold versus pedestal contrast (TvC) functions at 7 pedestal contrasts for various target-pedestal combinations with a temporal 2AFC paradigm and a staircase procedure...
2016: PloS One
https://www.readbyqxmd.com/read/27757076/contextual-interactions-in-grating-plaid-configurations-are-explained-by-natural-image-statistics-and-neural-modeling
#14
Udo A Ernst, Alina Schiffer, Malte Persike, Günter Meinhardt
Processing natural scenes requires the visual system to integrate local features into global object descriptions. To achieve coherent representations, the human brain uses statistical dependencies to guide weighting of local feature conjunctions. Pairwise interactions among feature detectors in early visual areas may form the early substrate of these local feature bindings. To investigate local interaction structures in visual cortex, we combined psychophysical experiments with computational modeling and natural scene analysis...
2016: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/27535373/masking-reduces-orientation-selectivity-in-rat-visual-cortex
#15
Dasuni S Alwis, Katrina L Richards, Nicholas S C Price
In visual masking the perception of a target stimulus is impaired by a preceding (forward) or succeeding (backward) mask stimulus. The illusion is of interest because it allows uncoupling of the physical stimulus, its neuronal representation, and its perception. To understand the neuronal correlates of masking, we examined how masks affected the neuronal responses to oriented target stimuli in the primary visual cortex (V1) of anesthetized rats (n = 37). Target stimuli were circular gratings with 12 orientations; mask stimuli were plaids created as a binarized sum of all possible target orientations...
November 1, 2016: Journal of Neurophysiology
https://www.readbyqxmd.com/read/27494546/asymmetric-visual-interactions-across-the-boundary-of-awareness
#16
Noya Meital-Kfir, Yoram S Bonneh, Dov Sagi
A salient visual object can disappear from conscious perception when surrounded by a moving texture, a phenomenon known as MIB, Motion-Induced Blindness (Bonneh, Cooperman, & Sagi, 2001). Here we tested the information available in the brain from such stimuli that do not access awareness by examining interactions across the boundary of awareness between stimuli that reach awareness and those that do not. Observers performed the MIB task in which a "Cue" was presented next to the "Target" after observers reported the perceptual disappearance of the target (Kawabe, Yamada, & Miura, 2007)...
August 1, 2016: Journal of Vision
https://www.readbyqxmd.com/read/27442322/ocular-manifestations-of-inherited-phospholipase-c%C3%AE-2-associated-antibody-deficiency-and-immune-dysregulation
#17
Antonio Di Zazzo, Maryam Tahvildari, George J Florakis, Reza Dana
PURPOSE: To report the ocular manifestations of phospholipase-Cγ2-associated antibody deficiency and immune dysregulation (PLAID). METHODS: Case report and literature review. RESULTS: A 21-year-old woman diagnosed with PLAID was referred for evaluation of repeated episodes of ocular inflammation resulting in bilateral peripheral corneal pannus with episcleritis and corneal scarring accompanied by systemic manifestations including epidermolysis bullosa and interstitial lung disease...
December 2016: Cornea
https://www.readbyqxmd.com/read/27365384/d%C3%A3-finir-les-choix-%C3%A3-risque-l-%C3%A3-thique-et-les-effets-des-d%C3%A3-cisions-organisationnelles
#18
REVIEW
Marika Warren
Les choix de vivre « à risque » sont complexes et difficiles. Ils peuvent être structurés par les politiques organisationnelles. Certaines personnes veulent vraiment vivre dans des situations à haut risque ou perçues comme telles parce qu'elles en tirent un avantage important. Cependant, il est probable que ces choix dépendent en grande partie du contexte et qu'ils ne se soient pas posés dans une autre situation. L'article plaide pour la responsabilité d'être attentif aux effets des décisions organisationnelles sur les choix de vivre à risque et sur la répartition globale du risque...
July 2016: Healthcare Management Forum
https://www.readbyqxmd.com/read/27307243/a-model-of-binocular-motion-integration-in-mt-neurons
#19
Pamela M Baker, Wyeth Bair
UNLABELLED: Primate cortical area MT plays a central role in visual motion perception, but models of this area have largely overlooked the binocular integration of motion signals. Recent electrophysiological studies tested binocular integration in MT and found surprisingly that MT neurons lose their hallmark "pattern motion" selectivity when stimuli are presented dichoptically and that many neurons are selective for motion-in-depth (MID). By unifying these novel observations with insights from monocular, frontoparallel motion studies concurrently in a binocular MT motion model, we generated clear, testable predictions about the circuitry and mechanisms underlying visual motion processing...
June 15, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27213009/bicnet-flexible-module-discovery-in-large-scale-biological-networks-using-biclustering
#20
Rui Henriques, Sara C Madeira
BACKGROUND: Despite the recognized importance of module discovery in biological networks to enhance our understanding of complex biological systems, existing methods generally suffer from two major drawbacks. First, there is a focus on modules where biological entities are strongly connected, leading to the discovery of trivial/well-known modules and to the inaccurate exclusion of biological entities with subtler yet relevant roles. Second, there is a generalized intolerance towards different forms of noise, including uncertainty associated with less-studied biological entities (in the context of literature-driven networks) and experimental noise (in the context of data-driven networks)...
2016: Algorithms for Molecular Biology: AMB
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