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NeuroImage

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https://www.readbyqxmd.com/read/28943414/in-vivo-mri-assessment-of-the-human-locus-coeruleus-along-its-rostrocaudal-extent-in-young-and-older-adults
#1
Matthew J Betts, Arturo Cardenas-Blanco, Martin Kanowski, Frank Jessen, Emrah Düzel
The locus coeruleus (LC), a major origin of noradrenergic projections in the central nervous system (CNS), may serve a critical role in the pathogenesis of neurodegenerative disorders such as Alzheimer's disease (AD) and Parkinson's disease (PD). As such, there is considerable interest to develop magnetic resonance imaging (MRI) techniques to assess the integrity of the LC in vivo. The high neuromelanin content of the LC serves as an endogenous contrast for MRI but existing protocols suffer from low spatial resolution along the rostrocaudal axis of the LC rendering it difficult to differentiate its integrity in caudal and rostral portions...
September 21, 2017: NeuroImage
https://www.readbyqxmd.com/read/28943413/the-cortical-dynamics-of-speaking-lexical-and-phonological-knowledge-simultaneously-recruit-the-frontal-and-temporal-cortex-within-200%C3%A2-ms
#2
Kristof Strijkers, Albert Costa, Friedemann Pulvermüller
Language production models typically assume that retrieving a word for articulation is a sequential process with substantial functional delays between conceptual, lexical, phonological and motor processing, respectively. Nevertheless, explicit evidence contrasting the spatiotemporal dynamics between different word production components is scarce. Here, using anatomically constrained magnetoencephalography during overt meaningful speech production, we explore the speed with which lexico-semantic versus acoustic-articulatory information of a to-be-uttered word become first neurophysiologically manifest in the cerebral cortex...
September 21, 2017: NeuroImage
https://www.readbyqxmd.com/read/28943412/magnetic-resonance-microdynamic-imaging-reveals-distinct-tissue-microenvironments
#3
Dan Benjamini, Peter J Basser
Magnetic resonance imaging (MRI) provides a powerful set of tools with which to investigate biological tissues noninvasively and in vivo. Tissues are heterogeneous in nature; an imaging voxel contains an ensemble of different cells and extracellular matrix components. A long-standing challenge has been to infer the content of and interactions among these microscopic tissue components within a macroscopic imaging voxel. Spatially resolved multidimensional relaxation-diffusion correlation (REDCO) spectroscopy holds the potential to deliver such microdynamic information...
September 21, 2017: NeuroImage
https://www.readbyqxmd.com/read/28943411/two-cortical-deficits-underlie-amblyopia-a-multi-focal-fmri-analysis
#4
REVIEW
Reza Farivar, Jiawei Zhou, Yufeng Huang, Lixia Feng, Yifeng Zhou, Robert F Hess
Amblyopia is a relatively common (incidence 3%) developmental disorder in which there is loss of vision as a consequence of a disruption to normal visual development. Although the deficit is monocular and known to be of cortical origin, the nature of the processing deficit is controversial. Human behavioral studies have identified two main deficits-a loss of contrast sensitivity and perceived spatial distortions. Here we use a multi-focal fMRI approach to ascertain, in a group of anisometropic amblyopes, whether these two deficits have a single common cause or whether they are the result of two underlying independent cortical disorders...
September 21, 2017: NeuroImage
https://www.readbyqxmd.com/read/28942063/in-vivo-magnetic-resonance-imaging-mri-of-laminae-in-the-human-cortex
#5
REVIEW
Robert Trampel, Pierre-Louis Bazin, Kerrin Pine, Nikolaus Weiskopf
The human neocortex is organized radially into six layers which differ in their myelination and the density and arrangement of neuronal cells. This cortical cyto- and myeloarchitecture plays a central role in the anatomical and functional neuroanatomy but is primarily accessible through invasive histology only. To overcome this limitation, several non-invasive MRI approaches have been, and are being, developed to resolve the anatomical cortical layers. As a result, recent studies on large populations and structure-function relationships at the laminar level became possible...
September 20, 2017: NeuroImage
https://www.readbyqxmd.com/read/28942062/volumetric-grey-matter-alterations-in-adolescents-and-adults-born-very-preterm-suggest-accelerated-brain-maturation
#6
Vyacheslav R Karolis, Sean Froudist-Walsh, Jasmin Kroll, Philip J Brittain, Chieh-En Jane Tseng, Kie-Woo Nam, Antje A T S Reinders, Robin M Murray, Steven C R Williams, Paul M Thompson, Chiara Nosarti
Previous research investigating structural neurodevelopmental alterations in individuals who were born very preterm demonstrated a complex pattern of grey matter changes that defy straightforward summary. Here we addressed this problem by characterising volumetric brain alterations in individuals who were born very preterm from adolescence to adulthood at three hierarchically related levels - global, modular and regional. We demarcated structural components that were either particularly resilient or vulnerable to the impact of very preterm birth...
September 20, 2017: NeuroImage
https://www.readbyqxmd.com/read/28942061/the-behavioral-and-cognitive-relevance-of-time-varying-dynamic-changes-in-functional-connectivity
#7
REVIEW
Jessica R Cohen
Recent advances in neuroimaging methods and analysis have led to an expanding body of research that investigates how large-scale brain network organization dynamically adapts to changes in one's environment, including both internal state changes and external stimulation. It is now possible to detect changes in functional connectivity that occur on the order of seconds, both during an unconstrained resting state and during the performance of constrained cognitive tasks. It is thought that these dynamic, time-varying changes in functional connectivity, often referred to as dynamic functional connectivity (dFC), include features that are relevant to behavior and cognition...
September 20, 2017: NeuroImage
https://www.readbyqxmd.com/read/28942060/functional-networks-and-network-perturbations-in-rodents
#8
REVIEW
Kai-Hsiang Chuang, Fatima A Nasrallah
Synchronous low-frequency oscillation in the resting human brain has been found to form networks of functionally associated areas and hence has been widely used to map the functional connectivity of the brain using techniques such as resting-state functional MRI (rsfMRI). Interestingly, similar resting-state networks can also be detected in the anesthetized rodent brain, including the default mode-like network. This opens up opportunities for understanding the neurophysiological basis of the rsfMRI signal, the behavioral relevance of the network characteristics, connectomic deficits in diseases and treatment effects on brain connectivity using rodents, particularly transgenic mouse models...
September 20, 2017: NeuroImage
https://www.readbyqxmd.com/read/28939433/robust-inter-subject-audiovisual-decoding-in-functional-magnetic-resonance-imaging-using-high-dimensional-regression
#9
Gal Raz, Michele Svanera, Neomi Singer, Gadi Gilam, Maya Bleich Cohen, Tamar Lin, Roee Admon, Tal Gonen, Avner Thaler, Roni Y Granot, Rainer Goebel, Sergio Benini, Giancarlo Valente
Major methodological advancements have been recently made in the field of neural decoding, which is concerned with the reconstruction of mental content from neuroimaging measures. However, in the absence of a large-scale examination of the validity of the decoding models across subjects and content, the extent to which these models can be generalized is not clear. This study addresses the challenge of producing generalizable decoding models, which allow the reconstruction of perceived audiovisual features from human magnetic resonance imaging (fMRI) data without prior training of the algorithm on the decoded content...
September 19, 2017: NeuroImage
https://www.readbyqxmd.com/read/28939432/characterizing-dynamic-amplitude-of-low-frequency-fluctuation-and-its-relationship-with-dynamic-functional-connectivity-an-application-to-schizophrenia
#10
REVIEW
Zening Fu, Yiheng Tu, Xin Di, Yuhui Du, G D Pearlson, J A Turner, Bharat B Biswal, Zhiguo Zhang, V D Calhoun
The human brain is a highly dynamic system with non-stationary neural activity and rapidly-changing neural interaction. Resting-state dynamic functional connectivity (dFC) has been widely studied during recent years, and the emerging aberrant dFC patterns have been identified as important features of many mental disorders such as schizophrenia (SZ). However, only focusing on the time-varying patterns in FC is not enough, since the local neural activity itself (in contrast to the inter-connectivity) is also found to be highly fluctuating from research using high-temporal-resolution imaging techniques...
September 19, 2017: NeuroImage
https://www.readbyqxmd.com/read/28939431/no-differential-effects-to-facial-expressions-under-continuous-flash-suppression-an-event-related-potentials-study
#11
Insa Schlossmacher, Markus Junghöfer, Thomas Straube, Maximilian Bruchmann
In recent years continuous flash suppression (CFS) has become a popular "blinding" technique for the investigation of nonconscious affective processing since it elicits potent and long-lasting suppression of conscious visual perception. While the majority of studies provides some positive evidence for nonconscious affective processing, there are also studies reporting their absence. Several methodological variations may give rise to this discrepancy: with respect to the experimental paradigm these variations pertain to the likelihood of residual stimulus visibility on the level of individual participants and single trials...
September 19, 2017: NeuroImage
https://www.readbyqxmd.com/read/28935240/the-neural-development-of-conditional-reasoning-in-children-different-mechanisms-for-assessing-the-logical-validity-and-likelihood-of-conclusions
#12
Flora Schwartz, Justine Epinat-Duclos, Jessica Léone, Jérôme Prado
Scientific and mathematical thinking relies on the ability to evaluate whether conclusions drawn from conditional (if-then) arguments are logically valid. Yet, the neural development of this ability -- termed deductive reasoning -- is largely unknown. Here we aimed to identify the neural mechanisms that underlie the emergence of deductive reasoning with conditional rules in children. We further tested whether these mechanisms have their roots in the neural mechanisms involved in judging the likelihood of conclusions...
September 18, 2017: NeuroImage
https://www.readbyqxmd.com/read/28935239/te-dependent-diffusion-imaging-teddi-distinguishes-between-compartmental-t2-relaxation-times
#13
Jelle Veraart, Dmitry S Novikov, Els Fieremans
Biophysical modeling of macroscopic diffusion-weighted MRI (dMRI) signal in terms of microscopic cellular parameters holds the promise of quantifying the integrity of white matter. Unfortunately, even fairly simple multi-compartment models of proton diffusion in the white matter do not provide a unique, biophysically plausible solution. Here we report a nontrivial diffusion MRI signal dependence on echo time (TE) in human white matter in vivo. We demonstrate that such TE dependence originates from compartment-specific T2 values and that it is a promising "orthogonal measure" able to break the degeneracy in parameter estimation, and to yield important relaxation metrics robustly...
September 18, 2017: NeuroImage
https://www.readbyqxmd.com/read/28923276/rapid-whole-brain-resting-state-fmri-at-3%C3%A2-t-efficiency-optimized-three-dimensional-epi-versus-repetition-time-matched-simultaneous-multi-slice-epi
#14
Rüdiger Stirnberg, Willem Huijbers, Daniel Brenner, Benedikt A Poser, Monique Breteler, Tony Stöcker
State-of-the-art simultaneous-multi-slice (SMS-)EPI and 3D-EPI share several properties that benefit functional MRI acquisition. Both sequences employ equivalent parallel imaging undersampling with controlled aliasing to achieve high temporal sampling rates. As a volumetric imaging sequence, 3D-EPI offers additional means of acceleration complementary to 2D-CAIPIRINHA sampling, such as fast water excitation and elliptical sampling. We performed an application-oriented comparison between a tailored, six-fold CAIPIRINHA-accelerated 3D-EPI protocol at 530 ms temporal and 2...
September 18, 2017: NeuroImage
https://www.readbyqxmd.com/read/28923274/mapping-orbitofrontal-limbic-maturation-in-non-human-primates-a-longitudinal-magnetic-resonance-imaging-study
#15
Akiko Uematsu, Junichi Hata, Yuji Komaki, Fumiko Seki, Chihoko Yamada, Norio Okahara, Yoko Kurotaki, Erika Sasaki, Hideyuki Okano
Brain development involves spatiotemporally complex microstructural changes. A number of neuropsychiatric disorders are linked to the neural processes of development and aging. Thus, it is important to understanding the typical developmental patterns of various brain structures, which will help to define critical periods of vulnerability for neural maturation, as well as anatomical mechanisms of brain structure-related neuropathology. In this study, we used magnetic resonance imaging to assess development of the orbitofrontal cortex, cingulate cortex, amygdala, and hippocampus in a non-human primate species, the common marmoset (Callithrix jacchus)...
September 18, 2017: NeuroImage
https://www.readbyqxmd.com/read/28927730/decreased-structural-connectivity-and-resting-state-brain-activity-in-the-lateral-occipital-cortex-is-associated-with-social-communication-deficits-in-boys-with-autism-spectrum-disorder
#16
REVIEW
Minyoung Jung, Yiheng Tu, Courtney Amanda Lang, Ana Ortiz, Joel Park, Kristen Jorgenson, Xue-Jun Kong, Jian Kong
Autism spectrum disorder (ASD) is a prevalent neurodevelopmental disorder characterized by atypical social communication and repetitive behaviors. In this study, we applied a multimodal approach to investigate brain structural connectivity, resting state activity, and surface area and their associations with the core symptoms of ASD. Data from forty boys with ASD (mean age, 11.5 years; age range, 5.5-19.5) and forty boys with typical development (TD) (mean age, 12.3; age range, 5.8-19.7) were extracted from the Autism Brain Imaging Data Exchange II (ABIDE II) for data analysis...
September 16, 2017: NeuroImage
https://www.readbyqxmd.com/read/28923275/in-vivo-magnetic-resonance-images-reveal-neuroanatomical-sex-differences-through-the-application-of-voxel-based-morphometry-in-c57bl-6-mice
#17
Cassandra E Meyer, Florian Kurth, Stefano Lepore, Josephine L Gao, Hadley Johnsonbaugh, Mandavi R Oberoi, Stephen J Sawiak, Allan MacKenzie-Graham
Behaviorally relevant sex differences are often associated with structural differences in the brain and many diseases are sexually dimorphic in prevalence and progression. Characterizing sex differences is imperative to gaining a complete understanding of behavior and disease which will, in turn, allow for a balanced approach to scientific research and the development of therapies. In this study, we generated novel tissue probability maps (TPMs) based on 30 male and 30 female in vivo C57BL/6 mouse brain magnetic resonance images and used voxel-based morphometry (VBM) to analyze sex differences...
September 15, 2017: NeuroImage
https://www.readbyqxmd.com/read/28919407/how-to-target-inter-regional-phase-synchronization-with-dual-site-transcranial-alternating-current-stimulation
#18
Guilherme Bicalho Saturnino, Kristoffer Hougaard Madsen, Hartwig Roman Siebner, Axel Thielscher
Large-scale synchronization of neural oscillations is a key mechanism for functional information exchange among brain areas. Dual-site Transcranial Alternating Current Stimulation (ds-TACS) has been recently introduced as non-invasive technique to manipulate the temporal phase relationship of local oscillations in two connected cortical areas. While the frequency of ds-TACS is matched, the phase of stimulation is either identical (in-phase stimulation) or opposite (anti-phase stimulation) in the two cortical target areas...
September 15, 2017: NeuroImage
https://www.readbyqxmd.com/read/28919408/neural-oscillations-reflect-latent-learning-states-underlying-dual-context-sensorimotor-adaptation
#19
Justin M Fine, Dalton Moore, Marco Santello
Recent studies have suggested that individuals can form multiple motor memories when simultaneously adapting to multiple, but oppositely-oriented perturbations. These findings predict that individuals detect the change in learning context, allowing the selective initialization and update of motor memories. However, previous electrophysiological studies of sensorimotor adaptation have not identified a neural mechanism supporting the detection of a context switch and adaptation to separate contexts. Here, we tested the hypothesis that such a mechanism is identifiable through neural oscillations measured through EEG...
September 14, 2017: NeuroImage
https://www.readbyqxmd.com/read/28917695/the-impact-of-gabaergic-drugs-on-tms-induced-brain-oscillations-in-human-motor-cortex
#20
Isabella Premoli, Til O Bergmann, Matteo Fecchio, Mario Rosanova, Andrea Biondi, Paolo Belardinelli, Ulf Ziemann
Brain responses to transcranial magnetic stimulation (TMS) as measured with electroencephalography (EEG) have so far been assessed either by TMS-evoked EEG potentials (TEPs), mostly reflecting phase-locked neuronal activity, or time-frequency-representations (TFRs), reflecting oscillatory power arising from a mixture of both evoked (i.e., phase-locked) and induced (i.e., non-phase-locked) responses. Single-pulse TMS of the human primary motor cortex induces a specific pattern of oscillatory changes, characterized by an early (30-200 ms after TMS) synchronization in the α- and β-bands over the stimulated sensorimotor cortex and adjacent lateral frontal cortex, followed by a late (200-400 ms) α- and β-desynchronization over the stimulated and contralateral sensorimotor cortex...
September 14, 2017: NeuroImage
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