keyword
MENU ▼
Read by QxMD icon Read
search

hierarchical generative model

keyword
https://www.readbyqxmd.com/read/27903727/predicting-when-in-discourse-engages-the-human-dorsal-auditory-stream-an-fmri-study-using-naturalistic-stories
#1
Katerina Danae Kandylaki, Arne Nagels, Sarah Tune, Tilo Kircher, Richard Wiese, Matthias Schlesewsky, Ina Bornkessel-Schlesewsky
: The hierarchical organization of human cortical circuits integrates information across different timescales via temporal receptive windows, which increase in length from lower to higher levels of the cortical hierarchy (Hasson et al., 2015). A recent neurobiological model of higher-order language processing (Bornkessel-Schlesewsky et al., 2015) posits that temporal receptive windows in the dorsal auditory stream provide the basis for a hierarchically organized predictive coding architecture (Friston and Kiebel, 2009)...
November 30, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27903121/craniopharyngioma-adherence-a-comprehensive-topographical-categorization-and-outcome-related-risk-stratification-model-based-on-the-methodical-examination-of-500-tumors
#2
Ruth Prieto, José María Pascual, Maria Rosdolsky, Inés Castro-Dufourny, Rodrigo Carrasco, Sewan Strauss, Laura Barrios
OBJECTIVE Craniopharyngioma (CP) adherence strongly influences the potential for achieving a radical and safe surgical treatment. However, this factor remains poorly addressed in the scientific literature. This study provides a rational, comprehensive description of CP adherence that can be used for the prediction of surgical risks associated with the removal of these challenging lesions. METHODS This study retrospectively analyzes the evidence provided in pathological, neuroradiological, and surgical CP reports concerning 3 components of the CP attachment: 1) the intracranial structures attached to the tumor; 2) the morphology of the adhesion; and 3) the adhesion strength...
December 2016: Neurosurgical Focus
https://www.readbyqxmd.com/read/27895566/allostatic-self-efficacy-a-metacognitive-theory-of-dyshomeostasis-induced-fatigue-and-depression
#3
Klaas E Stephan, Zina M Manjaly, Christoph D Mathys, Lilian A E Weber, Saee Paliwal, Tim Gard, Marc Tittgemeyer, Stephen M Fleming, Helene Haker, Anil K Seth, Frederike H Petzschner
This paper outlines a hierarchical Bayesian framework for interoception, homeostatic/allostatic control, and meta-cognition that connects fatigue and depression to the experience of chronic dyshomeostasis. Specifically, viewing interoception as the inversion of a generative model of viscerosensory inputs allows for a formal definition of dyshomeostasis (as chronically enhanced surprise about bodily signals, or, equivalently, low evidence for the brain's model of bodily states) and allostasis (as a change in prior beliefs or predictions which define setpoints for homeostatic reflex arcs)...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27890118/3d-digital-headform-models-of-australian-cyclists
#4
Thierry Ellena, Sebastian Skals, Aleksandar Subic, Helmy Mustafa, Toh Yen Pang
Traditional 1D anthropometric data have been the primary source of information used by ergonomists for the dimensioning of head and facial gear. Although these data are simple to use and understand, they only provide univariate measures of key dimensions. 3D anthropometric data, however, describe the complete shape characteristics of the head surface, but are complicated to interpret due to the abundance of information they contain. Consequently, current headform standards based on 1D measurements may not adequately represent the actual head shape variations of the intended user groups...
March 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/27880082/perceived-performance-and-impact-of-a-non-physician-led-interprofessional-team-in-a-trauma-clinic-setting
#5
Julia Driessen, Johanna E Bellon, Joel Stevans, Raquel M Forsythe, Benjamin R Reynolds, A Everette James
Faced with the challenge of meeting the wide degree of post-discharge needs in their trauma population, the University of Pittsburgh Medical Center (UPMC) developed a non-physician-led interprofessional team to provide follow-up care at its UPMC Falk Trauma Clinic. We assessed this model of care using a survey to gauge team member perceptions of this model, and used clinic visit documentation to apply a novel approach to assessing how this model improves the care received by clinic patients. The high level of perceived team performance and cohesion suggests that this model has been successful thus far from a provider perspective...
November 23, 2016: Journal of Interprofessional Care
https://www.readbyqxmd.com/read/27864648/actomyosin-based-contraction-one-mechanokinetic-model-from-single-molecules-to-muscle
#6
Alf Månsson
Bridging the gaps between experimental systems on different hierarchical scales is needed to overcome remaining challenges in the understanding of muscle contraction. Here, a mathematical model with well-characterized structural and biochemical actomyosin states is developed to that end. We hypothesize that this model accounts for generation of force and motion from single motor molecules to the large ensembles of muscle. In partial support of this idea, a wide range of contractile phenomena are reproduced without the need to invoke cooperative interactions or ad hoc states/transitions...
November 18, 2016: Journal of Muscle Research and Cell Motility
https://www.readbyqxmd.com/read/27861572/social-economic-status-and-cognitive-performance-among-chinese-aged-50-years-and-older
#7
Fan Wu, Yanfei Guo, Yang Zheng, Wenjun Ma, Paul Kowal, Somnath Chatterji, Ling Wang
BACKGROUND: Numerous population-based studies have suggested that socio-economic status (SES) is associated with cognitive performance, but few nationally representative epidemiological studies on cognitive performance with a large sample of older adults are available in China. And many studies explore the factors associated with cognitive performance, mainly focusing on individual level and more rarely on multiple levels that include the individual and community. METHODS: This study uses SAGE-China Wave 1 data which consisted of 13,157 adults aged 50 years and older to explore socioeconomic inequalities in the cognitive performance from a multilevel perspective (individual and community levels)...
2016: PloS One
https://www.readbyqxmd.com/read/27853419/benchmarking-spike-based-visual-recognition-a-dataset-and-evaluation
#8
Qian Liu, Garibaldi Pineda-García, Evangelos Stromatias, Teresa Serrano-Gotarredona, Steve B Furber
Today, increasing attention is being paid to research into spike-based neural computation both to gain a better understanding of the brain and to explore biologically-inspired computation. Within this field, the primate visual pathway and its hierarchical organization have been extensively studied. Spiking Neural Networks (SNNs), inspired by the understanding of observed biological structure and function, have been successfully applied to visual recognition and classification tasks. In addition, implementations on neuromorphic hardware have enabled large-scale networks to run in (or even faster than) real time, making spike-based neural vision processing accessible on mobile robots...
2016: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/27852218/rna-seq-based-transcriptomic-map-reveals-new-insights-into-mouse-salivary-gland-development-and-maturation
#9
Christian Gluck, Sangwon Min, Akinsola Oyelakin, Kirsten Smalley, Satrajit Sinha, Rose-Anne Romano
BACKGROUND: Mouse models have served a valuable role in deciphering various facets of Salivary Gland (SG) biology, from normal developmental programs to diseased states. To facilitate such studies, gene expression profiling maps have been generated for various stages of SG organogenesis. However these prior studies fall short of capturing the transcriptional complexity due to the limited scope of gene-centric microarray-based technology. Compared to microarray, RNA-sequencing (RNA-seq) offers unbiased detection of novel transcripts, broader dynamic range and high specificity and sensitivity for detection of genes, transcripts, and differential gene expression...
November 16, 2016: BMC Genomics
https://www.readbyqxmd.com/read/27846259/introducing-a-clustering-step-in-a-consensus-approach-for-the-scoring-of-protein-protein-docking-models
#10
Edrisse Chermak, Renato De Donato, Marc F Lensink, Andrea Petta, Luigi Serra, Vittorio Scarano, Luigi Cavallo, Romina Oliva
Correctly scoring protein-protein docking models to single out native-like ones is an open challenge. It is also an object of assessment in CAPRI (Critical Assessment of PRedicted Interactions), the community-wide blind docking experiment. We introduced in the field the first pure consensus method, CONSRANK, which ranks models based on their ability to match the most conserved contacts in the ensemble they belong to. In CAPRI, scorers are asked to evaluate a set of available models and select the top ten ones, based on their own scoring approach...
2016: PloS One
https://www.readbyqxmd.com/read/27831881/a-bottom-up-approach-for-pancreas-segmentation-using-cascaded-superpixels-and-deep-image-patch-labeling
#11
Amal Farag, Le Lu, Holger R Roth, Jiamin Liu, Evrim Turkbey, Ronald M Summers
Robust organ segmentation is a prerequisite for computer-aided diagnosis (CAD), quantitative imaging analysis, pathology detection and surgical assistance. For organs with high anatomical variability (e.g., the pancreas), previous segmentation approaches report low accuracies, compared to well studied organs, such as the liver or heart.We present an automated bottomup approach for pancreas segmentation in abdominal computed tomography (CT) scans. The method generates a hierarchical cascade of information propagation by classifying image patches at different resolutions and cascading (segments) superpixels...
November 1, 2016: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/27807470/a-bayesian-hierarchical-spatial-model-for-dental-caries-assessment-using-non-gaussian-markov-random-fields
#12
Ick Hoon Jin, Ying Yuan, Dipankar Bandyopadhyay
Research in dental caries generates data with two levels of hierarchy: that of a tooth overall and that of the different surfaces of the tooth. The outcomes often exhibit spatial referencing among neighboring teeth and surfaces, i.e., the disease status of a tooth or surface might be influenced by the status of a set of proximal teeth/surfaces. Assessments of dental caries (tooth decay) at the tooth level yield binary outcomes indicating the presence/absence of teeth, and trinary outcomes at the surface level indicating healthy, decayed, or filled surfaces...
2016: Annals of Applied Statistics
https://www.readbyqxmd.com/read/27799277/the-spike-and-slab-lasso-generalized-linear-models-for-prediction-and-associated-genes-detection
#13
Zaixiang Tang, Yueping Shen, Xinyan Zhang, Nengjun Yi
Large-scale omics data have been increasingly used as an important resource for prognostic prediction of diseases and detection of associated genes. However, there are considerable challenges in analyzing high-dimensional molecular data, including the large number of potential molecular predictors, limited number of samples, and small effect of each predictor. We propose new Bayesian hierarchical generalized linear models, called spike-and-slab lasso GLMs, for prognostic prediction and detection of associated genes using large-scale molecular data...
October 31, 2016: Genetics
https://www.readbyqxmd.com/read/27797539/the-visually-guided-development-of-facial-representations-in-the-primate-ventral-visual-pathway-a-computer-modeling-study
#14
Akihiro Eguchi, Glyn W Humphreys, Simon M Stringer
Experimental studies have shown that neurons at an intermediate stage of the primate ventral visual pathway, occipital face area, encode individual facial parts such as eyes and nose while neurons in the later stages, middle face patches, are selective to the full face by encoding the spatial relations between facial features. We have performed a computer modeling study to investigate how these cell firing properties may develop through unsupervised visually guided learning. A hierarchical neural network model of the primate's ventral visual pathway is trained by presenting many randomly generated faces to the network while a local learning rule modifies the strengths of the synaptic connections between neurons in successive layers...
November 2016: Psychological Review
https://www.readbyqxmd.com/read/27795704/efficient-actor-critic-algorithm-with-hierarchical-model-learning-and-planning
#15
Shan Zhong, Quan Liu, QiMing Fu
To improve the convergence rate and the sample efficiency, two efficient learning methods AC-HMLP and RAC-HMLP (AC-HMLP with ℓ2-regularization) are proposed by combining actor-critic algorithm with hierarchical model learning and planning. The hierarchical models consisting of the local and the global models, which are learned at the same time during learning of the value function and the policy, are approximated by local linear regression (LLR) and linear function approximation (LFA), respectively. Both the local model and the global model are applied to generate samples for planning; the former is used only if the state-prediction error does not surpass the threshold at each time step, while the latter is utilized at the end of each episode...
2016: Computational Intelligence and Neuroscience
https://www.readbyqxmd.com/read/27794041/ngsmethdb-2017-enhanced-methylomes-and-differential-methylation
#16
Ricardo Lebrón, Cristina Gómez-Martín, Pedro Carpena, Pedro Bernaola-Galván, Guillermo Barturen, Michael Hackenberg, José L Oliver
The 2017 update of NGSmethDB stores whole genome methylomes generated from short-read data sets obtained by bisulfite sequencing (WGBS) technology. To generate high-quality methylomes, stringent quality controls were integrated with third-part software, adding also a two-step mapping process to exploit the advantages of the new genome assembly models. The samples were all profiled under constant parameter settings, thus enabling comparative downstream analyses. Besides a significant increase in the number of samples, NGSmethDB now includes two additional data-types, which are a valuable resource for the discovery of methylation epigenetic biomarkers: (i) differentially methylated single-cytosines; and (ii) methylation segments (i...
October 27, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27780609/introduction-to-a-special-issue-on-concept-mapping
#17
William M Trochim, Daniel McLinden
Concept mapping was developed in the 1980s as a unique integration of qualitative (group process, brainstorming, unstructured sorting, interpretation) and quantitative (multidimensional scaling, hierarchical cluster analysis) methods designed to enable a group of people to articulate and depict graphically a coherent conceptual framework or model of any topic or issue of interest. This introduction provides the basic definition and description of the methodology for the newcomer and describes the steps typically followed in its most standard canonical form (preparation, generation, structuring, representation, interpretation and utilization)...
October 11, 2016: Evaluation and Program Planning
https://www.readbyqxmd.com/read/27770490/point-of-care-ultrasound-for-diagnosis-of-abscess-in-skin-and-soft-tissue-infections
#18
Sathyaseelan Subramaniam, Jacqueline Bober, Jennifer Chao, Shahriar Zehtabchi
BACKGROUND: Traditionally, emergency department (ED) physicians rely on their clinical examination to differentiate between cellulitis and abscess when evaluating skin and soft tissue infections (SSTI). Management of an abscess requires incision and drainage, whereas cellulitis generally requires a course of antibiotics. Misdiagnosis often results in unnecessary invasive procedures, sedations (for incision and drainage in pediatric patients), or a return ED visit for failed antibiotic therapy...
November 2016: Academic Emergency Medicine: Official Journal of the Society for Academic Emergency Medicine
https://www.readbyqxmd.com/read/27758100/hierarchical-self-organization-of-perylene-bisimides-into-supramolecular-spheres-and-periodic-arrays-thereof
#19
Dipankar Sahoo, Mihai Peterca, Emad Aqad, Benjamin E Partridge, Paul A Heiney, Robert Graf, Hans W Spiess, Xiangbing Zeng, Virgil Percec
Perylene bisimide derivatives (PBIs) are known to form only columnar or lamellar assemblies. There is no known example of a PBI self-assembling into a supramolecular sphere. Therefore, periodic and quasiperiodic arrays generated from spherical assemblies produced from PBIs are also not known. Here, a PBI functionalized at its imide groups with a second generation self-assembling dendron is reported to self-assemble into supramolecular spheres. These spheres self-organize in a body-centered cubic (BCC) periodic array, rarely encountered for self-assembling dendrons but often encountered in block copolymers...
October 19, 2016: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/27730393/privacy-preserving-and-secure-sharing-of-phr-in-the-cloud
#20
Leyou Zhang, Qing Wu, Yi Mu, Jingxia Zhang
As a new summarized record of an individual's medical data and information, Personal Health Record (PHR) can be accessible online. The owner can control fully his/her PHR files to be shared with different users such as doctors, clinic agents, and friends. However, in an open network environment like in the Cloud, these sensitive privacy information may be gotten by those unauthorized parties and users. In this paper, we consider how to achieve PHR data confidentiality and provide fine-grained access control of PHR files in the public Cloud based on Attribute Based Encryption(ABE)...
December 2016: Journal of Medical Systems
keyword
keyword
74786
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"