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https://www.readbyqxmd.com/read/27926446/how-motivation-and-reward-learning-modulate-selective-attention
#1
A Bourgeois, L Chelazzi, P Vuilleumier
Motivational stimuli such as rewards elicit adaptive responses and influence various cognitive functions. Notably, increasing evidence suggests that stimuli with particular motivational values can strongly shape perception and attention. These effects resemble both selective top-down and stimulus-driven attentional orienting, as they depend on internal states but arise without conscious will, yet they seem to reflect attentional systems that are functionally and anatomically distinct from those classically associated with frontoparietal cortical networks in the brain...
2016: Progress in Brain Research
https://www.readbyqxmd.com/read/27926378/automated-segmentation-of-white-matter-fiber-bundles-using-diffusion-tensor-imaging-data-and-a-new-density-based-clustering-algorithm
#2
Tahereh Kamali, Daniel Stashuk
OBJECTIVE: Robust and accurate segmentation of brain white matter (WM) fiber bundles assists in diagnosing and assessing progression or remission of neuropsychiatric diseases such as schizophrenia, autism and depression. Supervised segmentation methods are infeasible in most applications since generating gold standards is too costly. Hence, there is a growing interest in designing unsupervised methods. However, most conventional unsupervised methods require the number of clusters be known in advance which is not possible in most applications...
October 2016: Artificial Intelligence in Medicine
https://www.readbyqxmd.com/read/27923753/intra-and-extramedullary-dumbbell-shaped-schwannoma-of-the-medulla-oblongata-a-case-report-and-review-of-the-literature
#3
Qing Zhang, Ming Ni, Wei-Ming Liu, Wang Jia, Gui-Jun Jia, Jun-Ting Zhang
BACKGROUND: Brainstem intramedullary schwannomas (ISs) are extremely rare. Various theories have been suggested to explain its origin. Mason and Keigher first speculated that IS arises from the region where the nerve roots lose their sheaths on penetrating the pia mater. Wood et al. further predicted that IS will contain both intra- and extramedullary part and shape like a "dumbbell". However, no cases reported previously can support this assumption adequately. CASE DESCRIPTION: A 40-year-old woman presented with constant cervical pain, accompanied by progressive weakness of upper extremities and glove distribution numbness...
December 3, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27923230/skull-subsidence-due-to-periosteum-defect-following-craniotomy-in-a-child
#4
Hidetaka Arishima, Ayumi Akazawa, Ken-Ichiro Kikuta
We report a case of a 7-year-old child with a cranial deformity secondary to a craniotomy for an intracranial hematoma. He suffered from an acute epidural hematoma with a lineal fracture of the right temporal bone following a severe head injury. A large question mark-shaped skin flap with the periosteum and temporal muscle was created for a decompressive craniectomy; however, neither the acute epidural hematoma nor brain swelling was severe, and we performed a small craniotomy compared with the skin flap without a decompressive craniectomy...
December 7, 2016: Pediatric Neurosurgery
https://www.readbyqxmd.com/read/27921074/initial-performance-studies-of-a-wearable-brain-positron-emission-tomography-camera-based-on-autonomous-thin-film-digital-geiger-avalanche-photodiode-arrays
#5
Charles R Schmidtlein, James N Turner, Michael O Thompson, Krishna C Mandal, Ida Häggström, Jiahan Zhang, John L Humm, David H Feiglin, Andrzej Krol
Using analytical and Monte Carlo modeling, we explored performance of a lightweight wearable helmet-shaped brain positron emission tomography (PET), or BET camera, based on thin-film digital Geiger avalanche photodiode arrays with Lutetium-yttrium oxyorthosilicate (LYSO) or [Formula: see text] scintillators for imaging in vivo human brain function of freely moving and acting subjects. We investigated a spherical cap BET and cylindrical brain PET (CYL) geometries with 250-mm diameter. We also considered a clinical whole-body (WB) LYSO PET/CT scanner...
January 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/27920935/cerebral-foreign-body-granuloma-in-brain-triggering-generalized-seizures-without-obvious-craniocerebral-injury-a-case-report-and-review-of-the-literature
#6
Nina Brawanski, Peter Baumgarten, Jürgen Konczalla, Volker Seifert, Christian Senft
BACKGROUND: Intracerebral foreign body granuloma is rarely reported. We present the case of a male patient with a cerebral foreign body granuloma. CASE DESCRIPTION: Initial admission of a 67-year-old male patient was after an aphasia followed by secondary generalized seizures. Cranial computed tomography (CCT) showed a metal-dense, wedge-shaped foreign body in the range of the frontal sinus on the left side, breaking through the frontal sinus, and creating a connection to the frontal cerebral lobe...
2016: Surgical Neurology International
https://www.readbyqxmd.com/read/27920756/salmonella-typhimurium-and-multidirectional-communication-in-the-gut
#7
REVIEW
Elena V Gart, Jan S Suchodolski, Thomas H Welsh, Robert C Alaniz, Ronald D Randel, Sara D Lawhon
The mammalian digestive tract is home to trillions of microbes, including bacteria, archaea, protozoa, fungi, and viruses. In monogastric mammals the stomach and small intestine harbor diverse bacterial populations but are typically less populated than the colon. The gut bacterial community (microbiota hereafter) varies widely among different host species and individuals within a species. It is influenced by season of the year, age of the host, stress and disease. Ideally, the host and microbiota benefit each other...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27920284/a-giant-dumbbell-shaped-primitive-neuroectodermal-tumor-in-the-brain
#8
Zhi Gang Lan, Mao Jun Chen, Jin Li, Yanhui Liu
No abstract text is available yet for this article.
December 6, 2016: Neurology
https://www.readbyqxmd.com/read/27920126/postnatal-activation-of-tlr4-in-astrocytes-promotes-excitatory-synaptogenesis-in-hippocampal-neurons
#9
Yi Shen, Huaping Qin, Juan Chen, Lingyan Mou, Yang He, Yixiu Yan, Hang Zhou, Ya Lv, Zhong Chen, Junlu Wang, Yu-Dong Zhou
Astrocytes are critical in synapse development, and their dysfunction in crucial developmental stages leads to serious neurodevelopmental diseases, including seizures and epilepsy. Immune challenges not only affect brain development, but also promote seizure generation and epileptogenesis, implying immune activation is one of the key factors linking seizures and epilepsy to abnormal brain development. In this study, we report that activating astrocytes by systemic lipopolysaccharide (LPS) challenges in the second postnatal week promotes excitatory synapse development, leading to enhanced seizure susceptibility in mice...
December 5, 2016: Journal of Cell Biology
https://www.readbyqxmd.com/read/27918063/long-lasting-musical-training-modifies-language-processing-a-dichotic-fused-word-test-study
#10
L Sebastiani, E Castellani
Musical training modifies neural areas associated with both music and language and enhances speech perception and discrimination by engaging the right hemisphere regions classically associated with music processing. On these bases we hypothesized that participants with extended musical training could have reduced left-hemisphere dominance for speech. In order to verify this hypothesis, two groups of right-handed individuals, one with long-term musical training and one with no musical training, participated to a Dichotic Fused Word Test consisting in the simultaneous presentation of different pairs of rhyming words and pseudo-words, one to the left ear and one to the right one...
January 1, 2016: Archives Italiennes de Biologie
https://www.readbyqxmd.com/read/27917958/functional-complexity-emerging-from-anatomical-constraints-in-the-brain-the-significance-of-network-modularity-and-rich-clubs
#11
Gorka Zamora-López, Yuhan Chen, Gustavo Deco, Morten L Kringelbach, Changsong Zhou
The large-scale structural ingredients of the brain and neural connectomes have been identified in recent years. These are, similar to the features found in many other real networks: the arrangement of brain regions into modules and the presence of highly connected regions (hubs) forming rich-clubs. Here, we examine how modules and hubs shape the collective dynamics on networks and we find that both ingredients lead to the emergence of complex dynamics. Comparing the connectomes of C. elegans, cats, macaques and humans to surrogate networks in which either modules or hubs are destroyed, we find that functional complexity always decreases in the perturbed networks...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27917748/making-brains-run-faster-are-they-becoming-smarter
#12
Anja Pahor, Norbert Jaušovec
A brief overview of structural and functional brain characteristics related to g is presented in the light of major neurobiological theories of intelligence: Neural Efficiency, P-FIT and Multiple-Demand system. These theories provide a framework to discuss the main objective of the paper: what is the relationship between individual alpha frequency (IAF) and g? Three studies were conducted in order to investigate this relationship: two correlational studies and a third study in which we experimentally induced changes in IAF by means of transcranial alternating current stimulation (tACS)...
December 5, 2016: Spanish Journal of Psychology
https://www.readbyqxmd.com/read/27917679/the-default-mode-network-in-healthy-individuals-a-systematic-review-and-meta-analysis
#13
Lauren Elizabeth Mak, Luciano Minuzzi, Glenda MacQueen, Geoffrey Hall, Sidney Kennedy, Roumen Milev
OBJECTIVE: When the brain is not engaged in goal-directed activities and at "rest", there are still measureable patterns of activity. One resting state network, the default mode network (DMN) is responsible for a self-referential introspective state. There are many factors that influence normal changes in brain activity. The purpose of this review is to summarize differences in DMN functional connectivity in healthy individuals by age, sex, cognitive function and analysis type to characterize what is "normal"...
December 4, 2016: Brain Connectivity
https://www.readbyqxmd.com/read/27913407/whole-brain-analysis-reveals-increased-neuroanatomical-asymmetries-in-dementia-for-hippocampus-and-amygdala
#14
Christian Wachinger, David H Salat, Michael Weiner, Martin Reuter
Structural magnetic resonance imaging data are frequently analysed to reveal morphological changes of the human brain in dementia. Most contemporary imaging biomarkers are scalar values, such as the volume of a structure, and may miss the localized morphological variation of early presymptomatic disease progression. Neuroanatomical shape descriptors, however, can represent complex geometric information of individual anatomical regions and may demonstrate increased sensitivity in association studies. Yet, they remain largely unexplored...
December 2016: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/27912066/cell-type-specific-optical-recording-of-membrane-voltage-dynamics-in-freely-moving-mice
#15
Jesse D Marshall, Jin Zhong Li, Yanping Zhang, Yiyang Gong, François St-Pierre, Michael Z Lin, Mark J Schnitzer
Electrophysiological field potential dynamics are of fundamental interest in basic and clinical neuroscience, but how specific cell types shape these dynamics in the live brain is poorly understood. To empower mechanistic studies, we created an optical technique, TEMPO, that records the aggregate trans-membrane voltage dynamics of genetically specified neurons in freely behaving mice. TEMPO has >10-fold greater sensitivity than prior fiber-optic techniques and attains the noise minimum set by quantum mechanical photon shot noise...
December 1, 2016: Cell
https://www.readbyqxmd.com/read/27911322/shape-attributes-of-brain-structures-as-biomarkers-for-alzheimer-s-disease
#16
Tanya Glozman, Justin Solomon, Franco Pestilli, Leonidas Guibas
We describe a fully automatic framework for classification of two types of dementia based on the differences in the shape of brain structures. We consider Alzheimer's disease (AD), mild cognitive impairment of individuals who converted to AD within 18 months (MCIc), and normal controls (NC). Our approach uses statistical learning and a feature space consisting of projection-based shape descriptors, allowing for canonical representation of brain regions. Our framework automatically identifies the structures most affected by the disease...
November 26, 2016: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/27909002/anatomy-of-subcortical-structures-predicts-age-related-differences-in-skill-acquisition
#17
Sima Chalavi, Hamed Zivari Adab, Lisa Pauwels, Iseult A M Beets, Peter van Ruitenbeek, Matthieu P Boisgontier, Thiago Santos Monteiro, Celine Maes, Stefan Sunaert, Stephan P Swinnen
Skill acquisition capabilities vary substantially from one individual to another. Volumetric brain studies have demonstrated that global volume of several subcortical structures predicts variations in learning outcome in young adults (YA) and older adults (OA). In this study, for the first time, we utilized shape analysis, which offers a more sensitive detection of subregional brain anatomical deformations, to investigate whether subregional anatomy of subcortical structures is associated with training-induced performance improvement on a bimanual task in YA and OA, and whether this association is age-dependent...
November 30, 2016: Cerebral Cortex
https://www.readbyqxmd.com/read/27908148/local-attenuation-curve-optimization-framework-for-high-quality-perfusion-maps-in-low-dose-cerebral-perfusion-ct
#18
Vincent Van Nieuwenhove, Geert Van Eyndhoven, K Joost Batenburg, Nico Buls, Jef Vandemeulebroucke, Jan De Beenhouwer, Jan Sijbers
PURPOSE: Cerebral perfusion x-ray computed tomography (PCT) is a powerful tool for noninvasive imaging of hemodynamic information throughout the brain. Conventional PCT requires the brain to be imaged multiple times during the perfusion process, and hence radiation dose is a major concern. The authors propose a PCT reconstruction algorithm that allows for lowering the dose while maintaining a high quality of the perfusion maps. It relies on an accurate estimation of the arterial input function (AIF), which in turn depends on the quality of the attenuation curves in the arterial region...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27907266/retinal-axon-guidance-at-the-midline-chiasmatic-misrouting-and-consequences
#19
REVIEW
Delphine S Prieur, Alexandra Rebsam
The visual representation of the outside world relies on the appropriate connectivity between the eyes and the brain. Retinal ganglion cells are the sole neurons that send an axon from the retina to the brain, and thus the guidance decisions of retinal axons en route to their targets in the brain shape the neural circuitry that forms the basis of vision. Here, we focus on the choice made by retinal axons to cross or avoid the midline at the optic chiasm. This decision allows each brain hemisphere to receive inputs from both eyes corresponding to the same visual hemifield, and is thus crucial for binocular vision...
December 1, 2016: Developmental Neurobiology
https://www.readbyqxmd.com/read/27906755/optimal-blood-pressure-target-in-stroke-prevention
#20
Alexandra Yannoutsos, Céline Dreyfuss Tubiana, Michel E Safar, Jacques Blacher
PURPOSE OF REVIEW: A generalized single blood pressure (BP) goal may appear not suitable to achieve an optimal stroke prevention at the individual level. The aim of the present review is to consider the clinical relevance of individualized BP goal according to patient's age, comorbidities and established cerebrovascular disease. RECENT FINDINGS: Observational and interventional data support heterogeneity in target organ prevention in that lower BP values than recommended by hypertension guidelines are associated with further stroke risk reduction...
November 30, 2016: Current Opinion in Neurology
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