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Brain mapping

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https://www.readbyqxmd.com/read/29151166/t2-weighted-images-are-superior-to-other-mr-image-types-for-the-determination-of-diffuse-intrinsic-pontine-glioma-intratumoral-heterogeneity
#1
Stephen Harward, S Harrison Farber, Michael Malinzak, Oren Becher, Eric M Thompson
PURPOSE: Diffuse intrinsic pontine glioma (DIPG) remains the main cause of death in children with brain tumors. Given the inefficacy of numerous peripherally delivered agents to treat DIPG, convection enhanced delivery (CED) of therapeutic agents is a promising treatment modality. The purpose of this study was to determine which MR imaging type provides the best discrimination of intratumoral heterogeneity to guide future stereotactic implantation of CED catheters into the most cellular tumor regions...
November 18, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29149715/robust-brain-roi-segmentation-by-deformation-regression-and-deformable-shape-model
#2
Zhengwang Wu, Yanrong Guo, Sang Hyun Park, Yaozong Gao, Pei Dong, Seong-Whan Lee, Dinggang Shen
We propose a robust and efficient learning-based deformable model for segmenting regions of interest (ROIs) from structural MR brain images. Different from the conventional deformable-model-based methods that deform a shape model locally around the initialization location, we learn an image-based regressor to guide the deformable model to fit for the target ROI. Specifically, given any voxel in a new image, the image-based regressor can predict the displacement vector from this voxel towards the boundary of target ROI, which can be used to guide the deformable segmentation...
November 10, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/29149245/high-dimensional-therapeutic-inference-in-the-focally-damaged-human-brain
#3
Tianbo Xu, Hans Rolf Jäger, Masud Husain, Geraint Rees, Parashkev Nachev
Though consistency across the population renders the extraordinarily complex functional anatomy of the human brain surveyable, the inverse inference-from common functional maps to individual behaviour-is constrained by marked individual deviation from the population mean. Such inference is fundamental to the evaluation of therapeutic interventions in focal brain injury, where the impact of an induced structural change in the brain is quantified by its behavioural consequences, inevitably refracted through the lens of lesion-outcome relations...
November 15, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29149177/new-brain-lesions-with-no-impact-on-physical-disability-can-impact-cognition-in-early-multiple-sclerosis-a-ten-year-longitudinal-study
#4
D Wybrecht, F Reuter, F Pariollaud, W Zaaraoui, A Le Troter, A Rico, S Confort-Gouny, E Soulier, M Guye, A Maarouf, J-P Ranjeva, J Pelletier, B Audoin
OBJECTIVE: In early multiple sclerosis, although brain T2 lesions accrual are hallmark of the disease, only weak correlations were found between T2 lesions accrual and EDSS progression, the disability scale commonly used in multiple sclerosis studies. This may be related to the very poor sensitivity of EDSS to cognitive dysfunctions that may occur and progress from the first stage of the disease. In the present study, we aimed to demonstrate that cognitive deficits progress during the first ten years of MS and are significantly impacted by new T2 lesions...
2017: PloS One
https://www.readbyqxmd.com/read/29148040/the-endocranial-shape-of-australopithecus-africanus-surface-analysis-of-the-endocasts-of-sts-5-and-sts-60
#5
Amélie Beaudet, Jean Dumoncel, Frikkie de Beer, Stanley Durrleman, Emmanuel Gilissen, Anna Oettlé, Gérard Subsol, John Francis Thackeray, José Braga
Assessment of global endocranial morphology and regional neuroanatomical changes in early hominins is critical for the reconstruction of evolutionary trajectories of cerebral regions in the human lineage. Early evidence of cortical reorganization in specific local areas (e.g. visual cortex, inferior frontal gyrus) is perceptible in the non-human South African hominin fossil record. However, to date, little information is available regarding potential global changes in the early hominin brain. The introduction of non-invasive imaging techniques opens up new perspectives for the study of hominin brain evolution...
November 16, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/29147631/automated-whole-brain-tractography-affects-preoperative-surgical-decision-making
#6
Hesham Zakaria, Sameah Haider, Ian Lee
Surgery in and around eloquent brain structures poses a technical challenge when the goal of surgery is maximal safe resection. Magnetic resonance imaging (MRI) has revolutionized the diagnosis and treatment of neurological disorders, but tractography still remains limited in terms of utility because of the requisite manual labor and time required combined with the high risk of bias and inaccuracy. Automated whole brain tractography (AWBT) has simplified this workflow, overcoming historical barriers, and allowing for integration into modern neuronavigation...
September 6, 2017: Curēus
https://www.readbyqxmd.com/read/29147143/analyzing-text-recognition-from-tactually-evoked-eeg
#7
A Khasnobish, S Datta, R Bose, D N Tibarewala, A Konar
Tactual exploration of objects produce specific patterns in the human brain and hence objects can be recognized by analyzing brain signals during tactile exploration. The present work aims at analyzing EEG signals online for recognition of embossed texts by tactual exploration. EEG signals are acquired from the parietal region over the somatosensory cortex of blindfolded healthy subjects while they tactually explored embossed texts, including symbols, numbers, and alphabets. Classifiers based on the principle of supervised learning are trained on the extracted EEG feature space, comprising three features, namely, adaptive autoregressive parameters, Hurst exponents, and power spectral density, to recognize the respective texts...
December 2017: Cognitive Neurodynamics
https://www.readbyqxmd.com/read/29146466/causal-mapping-of-emotion-networks-in-the-human-brain-framework-and-initial-findings
#8
Julien Dubois, Hiroyuki Oya, J Michael Tyszka, Matthew Howard, Frederick Eberhardt, Ralph Adolphs
Emotions involve many cortical and subcortical regions, prominently including the amygdala. It remains unknown how these multiple network components interact, and it remains unknown how they cause the behavioral, autonomic, and experiential effects of emotions. Here we describe a framework for combining a novel technique, concurrent electrical stimulation with fMRI (es-fMRI), together with a novel analysis, inferring causal structure from fMRI data (causal discovery). We outline a research program for investigating human emotion with these new tools, and provide initial findings from two large resting-state datasets as well as case studies in neurosurgical patients with electrical stimulation of the amygdala...
November 13, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/29146376/wronger-than-wrong-graded-mapping-of-the-errors-of-an-avatar-in-the-performance-monitoring-system-of-the-onlooker
#9
G Spinelli, G Tieri, E F Pavone, S M Aglioti
EEG studies show that observing errors in one's own or others' actions triggers specific electro-cortical signatures in the onlooker's brain, but whether the brain error-monitoring system operates according to graded or discrete rules is still largely unknown. To explore this issue, we combined immersive virtual reality with EEG recording in participants who observed an avatar reaching-to-grasp a glass from a first-person perspective. The avatar could perform correct or erroneous actions. Erroneous grasps were defined as small or large depending on the magnitude of the trajectory deviation from the to-be-grasped glass...
November 13, 2017: NeuroImage
https://www.readbyqxmd.com/read/29145497/rare-genetic-variants-in-the-endocannabinoid-system-genes-cnr1-and-dagla-are-associated-with-neurological-phenotypes-in-humans
#10
Douglas R Smith, Christine M Stanley, Theodore Foss, Richard G Boles, Kevin McKernan
Rare genetic variants in the core endocannabinoid system genes CNR1, CNR2, DAGLA, MGLL and FAAH were identified in molecular testing data from 6,032 patients with a broad spectrum of neurological disorders. The variants were evaluated for association with phenotypes similar to those observed in the orthologous gene knockouts in mice. Heterozygous rare coding variants in CNR1, which encodes the type 1 cannabinoid receptor (CB1), were found to be significantly associated with pain sensitivity (especially migraine), sleep and memory disorders-alone or in combination with anxiety-compared to a set of controls without such CNR1 variants...
2017: PloS One
https://www.readbyqxmd.com/read/29143921/dichloroacetate-induced-intracellular-acidification-in-glioblastoma-in-vivo-detection-using-aacid-cest-mri-at-9-4%C3%A2-tesla
#11
Mohammed Albatany, Alex Li, Susan Meakin, Robert Bartha
Intracellular pH (pHi) plays an important role in the maintenance of normal cell function, and is maintained within a narrow range by the activity of transporters located at the plasma membrane. Modulation of tumor pHi may influence proliferation, apoptosis, chemotherapy resistance, and thermosensitivity. Chemical exchange saturation transfer (CEST) is a novel MRI contrast mechanism that is dependent on cellular pH. Amine and amide concentration-independent detection (AACID) is a recently developed CEST contrast method that is intracellular pH (pHi) weighted...
November 16, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29143307/considerations-in-performing-and-analyzing-the-responses-of-cortico-cortical-evoked-potentials-in-stereo-eeg
#12
REVIEW
David Prime, David Rowlands, Steven O'Keefe, Sasha Dionisio
This review aims to highlight key considerations when performing cortico-cortical evoked potentials (CCEPs) using stereo-electroencephalography (SEEG) for network mapping and show its clinical applicability to presurgical evaluations. The parameters for performing stimulation and safety aspects have been investigated in electrocorticography (ECoG) and deep brain stimulation (DBS), but not as extensively in SEEG. A review of current literature was performed, with an attempt made to emphasize practical insights from all modalities of intracranial stimulation...
November 16, 2017: Epilepsia
https://www.readbyqxmd.com/read/29142228/genome-wide-mapping-of-genetic-determinants-influencing-dna-methylation-and-gene-expression-in-human-hippocampus
#13
Herbert Schulz, Ann-Kathrin Ruppert, Stefan Herms, Christiane Wolf, Nazanin Mirza-Schreiber, Oliver Stegle, Darina Czamara, Andreas J Forstner, Sugirthan Sivalingam, Susanne Schoch, Susanne Moebus, Benno Pütz, Axel Hillmer, Nadine Fricker, Hartmut Vatter, Bertram Müller-Myhsok, Markus M Nöthen, Albert J Becker, Per Hoffmann, Thomas Sander, Sven Cichon
Emerging evidence emphasizes the strong impact of regulatory genomic elements in neurodevelopmental processes and the complex pathways of brain disorders. The present genome-wide quantitative trait loci analyses explore the cis-regulatory effects of single-nucleotide polymorphisms (SNPs) on DNA methylation (meQTL) and gene expression (eQTL) in 110 human hippocampal biopsies. We identify cis-meQTLs at 14,118 CpG methylation sites and cis-eQTLs for 302 3'-mRNA transcripts of 288 genes. Hippocampal cis-meQTL-CpGs are enriched in flanking regions of active promoters, CpG island shores, binding sites of the transcription factor CTCF and brain eQTLs...
November 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/29141638/diffusion-weighted-imaging-of-the-brains-of-dogs-with-idiopathic-epilepsy
#14
Antje Hartmann, Steffen Sager, Klaus Failing, Marion Sparenberg, Martin J Schmidt
BACKGROUND: Idiopathic epilepsy is one of the most common neurological disorders in dogs. Unfortunately, up to 30% of dogs with idiopathic epilepsy show no improvement under antiepileptic drug treatment. Diffusion-weighted imaging is used in human medicine to identify epileptogenic foci in the brain to allow for more invasive treatments such as deep brain stimulation or surgical removal. The aim of this study was to ass the feasibility of interictal diffusion-weighted MRI in dogs and to evaluate the distribution of diffusion in the brains of dogs with idiopathic epilepsy (IE) and to compare these values to previously published values from healthy beagle dogs...
November 15, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/29141045/csf-in-the-ventricles-of-the-brain-behaves-as-a-relay-medium-for-arteriovenous-pulse-wave-phase-coupling
#15
William E Butler, Pankaj K Agarwalla, Patrick Codd
The ventricles of the brain remain perhaps the largest anatomic structure in the human body without established primary purpose, even though their existence has been known at least since described by Aristotle. We hypothesize that the ventricles help match a stroke volume of arterial blood that arrives into the rigid cranium with an equivalent volume of ejected venous blood by spatially configuring cerebrospinal fluid (CSF) to act as a low viscosity relay medium for arteriovenous pulse wave (PW) phase coupling...
2017: PloS One
https://www.readbyqxmd.com/read/29140533/come-together-human-avatar-on-line-interactions-boost-joint-action-performance-in-apraxic-patients
#16
Matteo Candidi, Lucia M Sacheli, Vanessa Era, Loredana Canzano, Gaetano Tieri, Salvatore M Aglioti
Limb apraxia (LA) is a high-order motor disorder linked to left-hemisphere damage. It is characterized by defective execution of purposeful actions upon delayed imitation, or verbal command when the actions are performed in isolated, non-naturalistic, conditions. Whether interpersonal interactions provide social affordances that activate neural resources different from those requested by individual action execution, which may improve LA performance, is unknown. To fill this gap, we measured interaction performance, behavioral and kinematic indexes of left-brain damaged patients with/without LA in a social reach-to-grasp task involving two different degrees of spatio-temporal interactivity with an avatar...
November 1, 2017: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/29139337/do-people-with-severe-traumatic-brain-injury-benefit-from-making-errors-a-randomized-controlled-trial-of-error-based-and-errorless-learning
#17
Tamara Ownsworth, Jennifer Fleming, Robyn Tate, Elizabeth Beadle, Janelle Griffin, Melissa Kendall, Julia Schmidt, Amanda Lane-Brown, Mathilde Chevignard, David H K Shum
BACKGROUND: Errorless learning (ELL) and error-based learning (EBL) are commonly used approaches to rehabilitation for people with traumatic brain injury (TBI). However, it is unknown whether making errors is beneficial in the learning process to promote skills generalization after severe TBI. OBJECTIVE: To compare the efficacy of ELL and EBL for improving skills generalization, self-awareness, behavioral competency, and psychosocial functioning after severe TBI...
November 1, 2017: Neurorehabilitation and Neural Repair
https://www.readbyqxmd.com/read/29139243/wide-field-spectrally-resolved-quantitative-fluorescence-imaging-system-toward-neurosurgical-guidance-in-glioma-resection
#18
Yijing Xie, Maria Thom, Michael Ebner, Victoria Wykes, Adrien Desjardins, Anna Miserocchi, Sebastien Ourselin, Andrew W McEvoy, Tom Vercauteren
In high-grade glioma surgery, tumor resection is often guided by intraoperative fluorescence imaging. 5-aminolevulinic acid-induced protoporphyrin IX (PpIX) provides fluorescent contrast between normal brain tissue and glioma tissue, thus achieving improved tumor delineation and prolonged patient survival compared with conventional white-light-guided resection. However, commercially available fluorescence imaging systems rely solely on visual assessment of fluorescence patterns by the surgeon, which makes the resection more subjective than necessary...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29139172/association-between-structural-brain-network-efficiency-and-intelligence-increases-during-adolescence
#19
Marinka M G Koenis, Rachel M Brouwer, Suzanne C Swagerman, Inge L C van Soelen, Dorret I Boomsma, Hilleke E Hulshoff Pol
Adolescence represents an important period during which considerable changes in the brain take place, including increases in integrity of white matter bundles, and increasing efficiency of the structural brain network. A more efficient structural brain network has been associated with higher intelligence. Whether development of structural network efficiency is related to intelligence, and if so to which extent genetic and environmental influences are implicated in their association, is not known. In a longitudinal study, we mapped FA-weighted efficiency of the structural brain network in 310 twins and their older siblings at an average age of 10, 13, and 18 years...
November 14, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/29138314/imaging-and-quantifying-ganglion-cells-and-other-transparent-neurons-in-the-living-human-retina
#20
Zhuolin Liu, Kazuhiro Kurokawa, Furu Zhang, John J Lee, Donald T Miller
Ganglion cells (GCs) are fundamental to retinal neural circuitry, processing photoreceptor signals for transmission to the brain via their axons. However, much remains unknown about their role in vision and their vulnerability to disease leading to blindness. A major bottleneck has been our inability to observe GCs and their degeneration in the living human eye. Despite two decades of development of optical technologies to image cells in the living human retina, GCs remain elusive due to their high optical translucency...
November 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
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