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Resting state networks

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https://www.readbyqxmd.com/read/28434159/decreased-hemispheric-connectivity-and-decreased-intra-and-inter-hemisphere-asymmetry-of-resting-state-functional-network-connectivity-in-schizophrenia
#1
O Agcaoglu, R Miller, E Damaraju, B Rashid, J Bustillo, M S Cetin, T G M Van Erp, S McEwen, A Preda, J M Ford, K O Lim, D S Manoach, D H Mathalon, S G Potkin, V D Calhoun
Many studies have shown that schizophrenia patients have aberrant functional network connectivity (FNC) among brain regions, suggesting schizophrenia manifests with significantly diminished (in majority of the cases) connectivity. Schizophrenia is also associated with a lack of hemispheric lateralization. Hoptman et al. (2012) reported lower inter-hemispheric connectivity in schizophrenia patients compared to controls using voxel-mirrored homotopic connectivity. In this study, we merge these two points of views together using a group independent component analysis (gICA)-based approach to generate hemisphere-specific timecourses and calculate intra-hemisphere and inter-hemisphere FNC on a resting state fMRI dataset consisting of age- and gender-balanced 151 schizophrenia patients and 163 healthy controls...
April 22, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28431177/altered-functional-connectivity-in-idiopathic-rapid-eye-movement-sleep-behavior-disorder-a-resting-state-eeg-study
#2
Jun-Sang Sunwoo, Sanghun Lee, Jung-Hoon Kim, Jung-Ah Lim, Tae-Joon Kim, Jung-Ick Byun, Min Hee Jeong, Kwang Su Cha, Jeong Woo Choi, Kyung Hwan Kim, Soon-Tae Lee, Keun-Hwa Jung, Kyung-Il Park, Kon Chu, Manho Kim, Sang Kun Lee, Ki-Young Jung
Study Objectives: Idiopathic rapid eye movement sleep behavior disorder (iRBD) is considered as a prodromal stage of synucleinopathy. Although loss of functional connectivity is implicated in neurodegenerative diseases, network characteristics of electroencephalography (EEG) in iRBD are unknown. Therefore, we evaluated resting-state EEG functional connectivity to identify the brain network changes in patients with iRBD. Methods: We prospectively enrolled 20 patients with polysomnography-confirmed iRBD and 16 control subjects...
April 18, 2017: Sleep
https://www.readbyqxmd.com/read/28429774/synchronization-and-variability-imbalance-underlie-cognitive-impairment-in-primary-progressive-multiple-sclerosis
#3
Maria Petracca, Catarina Saiote, Heidi A Bender, Franchesca Arias, Colleen Farrell, Paola Magioncalda, Matteo Martino, Aaron Miller, Georg Northoff, Fred Lublin, Matilde Inglese
We aimed to investigate functional connectivity and variability across multiple frequency bands in brain networks underlying cognitive deficits in primary-progressive multiple sclerosis (PP-MS) and to explore how they are affected by the presence of cortical lesions (CLs). We analyzed functional connectivity and variability (measured as the standard deviation of BOLD signal amplitude) in resting state networks (RSNs) associated with cognitive deficits in different frequency bands in 25 PP-MS patients (12 M, mean age 50...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28429383/altered-eigenvector-centrality-is-related-to-local-resting-state-network-functional-connectivity-in-patients-with-longstanding-type-1-diabetes-mellitus
#4
Eelco van Duinkerken, Menno M Schoonheim, Richard G IJzerman, Annette C Moll, Jesus Landeira-Fernandez, Martin Klein, Michaela Diamant, Frank J Snoek, Frederik Barkhof, Alle-Meije Wink
INTRODUCTION: Longstanding type 1 diabetes (T1DM) is associated with microangiopathy and poorer cognition. In the brain, T1DM is related to increased functional resting-state network (RSN) connectivity in patients without, which was decreased in patients with clinically evident microangiopathy. Subcortical structure seems affected in both patient groups. How these localized alterations affect the hierarchy of the functional network in T1DM is unknown. Eigenvector centrality mapping (ECM) and degree centrality are graph theoretical methods that allow determining the relative importance (ECM) and connectedness (degree centrality) of regions within the whole-brain network hierarchy...
April 21, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28429067/neuronal-oscillations-and-synchronicity-associated-with-gamma-hydroxybutyrate-during-resting-state-in-healthy-male-volunteers
#5
Robin von Rotz, Michael Kometer, Dario Dornbierer, Jürg Gertsch, M Salomé Gachet, Franz X Vollenweider, Erich Seifritz, Oliver G Bosch, Boris B Quednow
RATIONALE: Gamma-hydroxybutyrate (GHB) is a putative neurotransmitter, a drug of abuse, an anesthetic agent, and a treatment for neuropsychiatric disorders. In previous electroencephalography (EEG) studies, GHB was shown to induce an electrophysiological pattern of "paradoxical EEG-behavioral dissociation" characterized by increased delta and theta oscillations usually associated with sleep during awake states. However, no detailed source localization of these alterations and no connectivity analyses have been performed yet...
April 20, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28428208/resting-state-seed-based-analysis-an-alternative-to-task-based-language-fmri-and-its-laterality-index
#6
K A Smitha, K M Arun, P G Rajesh, B Thomas, C Kesavadas
BACKGROUND AND PURPOSE: Language is a cardinal function that makes human unique. Preservation of language function poses a great challenge for surgeons during resection. The aim of the study was to assess the efficacy of resting-state fMRI in the lateralization of language function in healthy subjects to permit its further testing in patients who are unable to perform task-based fMRI. MATERIALS AND METHODS: Eighteen healthy right-handed volunteers were prospectively evaluated with resting-state fMRI and task-based fMRI to assess language networks...
April 20, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28428146/the-correlation-between-mood-states-and-functional-connectivity-within-the-default-mode-network-can-differentiate-internet-gaming-disorder-from-healthy-controls
#7
Guangheng Dong, Hui Li, Lingxiao Wang, Marc N Potenza
The default-mode network (DMN) has been suggested to support a baseline state of brain activity. However, whether connectivity within the DMN is associated with mood states remains incompletely understood. The current study examined the correlation between mood state and the functional connectivity (FC) among DMN regions, and examined if the FC can differentiate Internet gaming disorder (IGD) from healthy controls (HC). Resting state data were collected within 108 college students (IGD,41; HC,67). Negative correlations were observed between measures of: (1) Depression and FCs among ventral DMN regions; (2) Anger and FCs among dorsal DMN regions; and, (3) Anger and Depression and FCs of both the ventral and dorsal DMN...
April 18, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28425563/differences-in-interregional-brain-connectivity-in-children-with-unilateral-hearing-loss
#8
Matthew E Jung, Miranda Colletta, Rebecca Coalson, Bradley L Schlaggar, Judith E C Lieu
OBJECTIVES: To identify functional network architecture differences in the brains of children with unilateral hearing loss (UHL) using resting-state functional-connectivity magnetic resonance imaging (rs-fcMRI). STUDY DESIGN: Prospective observational study. METHODS: Children (7 to 17 years of age) with severe to profound hearing loss in one ear, along with their normal hearing (NH) siblings, were recruited and imaged using rs-fcMRI. Eleven children had right UHL; nine had left UHL; and 13 had normal hearing...
April 20, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28425500/structure-shapes-dynamics-and-directionality-in-diverse-brain-networks-mathematical-principles-and-empirical-confirmation-in-three-species
#9
Joon-Young Moon, Junhyeok Kim, Tae-Wook Ko, Minkyung Kim, Yasser Iturria-Medina, Jee-Hyun Choi, Joseph Lee, George A Mashour, UnCheol Lee
Identifying how spatially distributed information becomes integrated in the brain is essential to understanding higher cognitive functions. Previous computational and empirical studies suggest a significant influence of brain network structure on brain network function. However, there have been few analytical approaches to explain the role of network structure in shaping regional activities and directionality patterns. In this study, analytical methods are applied to a coupled oscillator model implemented in inhomogeneous networks...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28424611/modafinil-induced-changes-in-functional-connectivity-in-the-cortex-and-cerebellum-of-healthy-elderly-subjects
#10
Miriam Punzi, Tommaso Gili, Laura Petrosini, Carlo Caltagirone, Gianfranco Spalletta, Stefano L Sensi
In the past few years, cognitive enhancing drugs (CEDs) have gained growing interest and the focus of investigations aimed at exploring their use to potentiate the cognitive performances of healthy individuals. Most of this exploratory CED-related research has been performed on young adults. However, CEDs may also help to maintain optimal brain functioning or compensate for subtle and or subclinical deficits associated with brain aging or early-stage dementia. In this study, we assessed effects on resting state brain activity in a group of healthy elderly subjects undergoing acute administration of modafinil, a wakefulness-promoting agent...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28422373/longitudinal-recovery-of-local-neuronal-activity-and-consciousness-level-in-acquired-brain-injury
#11
Qihong Zou, Xuehai Wu, Jin Hu, Weijun Tang, Ying Mao, Jianhong Zhu, Lu Lu, Yao Zhang, Jia-Hong Gao
Decreased brain activity in the default mode network, particularly in the precuneus (PCU), has been consistently shown in acquired brain injury (ABI) patients. However, it is unclear whether resting-state brain activity recovers longitudinally in ABI patients and whether functional activity restoration is associated with improvements in consciousness level. Here, resting-state fMRI data were acquired from 23 ABI patients and 30 age- and gender-matched controls with two longitudinal observations for each participant...
April 19, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28422138/abnormal-resting-state-functional-connectivity-in-the-orbitofrontal-cortex-of-heroin-users-and-its-relationship-with-anxiety-a-pilot-fnirs-study
#12
Hada Fong-Ha Ieong, Zhen Yuan
Drug addiction is widely linked to the orbitofrontal cortex (OFC), which is essential for regulating reward-related behaviors, emotional responses, and anxiety. Over the past two decades, neuroimaging has provided significant contributions revealing functional and structural alternations in the brains of drug addicts. However, the underlying neural mechanism in the OFC and its correlates with drug addiction and anxiety still require further elucidation. We first presented a pilot investigation to examine local networks in OFC regions through resting-state functional connectivity (rsFC) using functional near-infrared spectroscopy (fNIRS) from eight abstinent addicts in a heroin-dependent group (HD) and seven subjects in a control group (CG)...
April 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28420981/age-related-difference-in-functional-brain-connectivity-of-mastication
#13
Chia-Shu Lin, Ching-Yi Wu, Shih-Yun Wu, Hsiao-Han Lin, Dong-Hui Cheng, Wen-Liang Lo
The age-related decline in motor function is associated with changes in intrinsic brain signatures. Here, we investigated the functional connectivity (FC) associated with masticatory performance, a clinical index evaluating general masticatory function. Twenty-six older adults (OA) and 26 younger (YA) healthy adults were recruited and assessed using the masticatory performance index (MPI) and resting-state functional magnetic resonance imaging (rs-fMRI). We analyzed the rs-fMRI FC network related to mastication, which was constructed based on 12 bilateral mastication-related brain regions according to the literature...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28418398/intranasal-oxytocin-enhances-intrinsic-corticostriatal-functional-connectivity-in-women
#14
R A I Bethlehem, M V Lombardo, M-C Lai, B Auyeung, S K Crockford, J Deakin, S Soubramanian, A Sule, P Kundu, V Voon, S Baron-Cohen
Oxytocin may influence various human behaviors and the connectivity across subcortical and cortical networks. Previous oxytocin studies are male biased and often constrained by task-based inferences. Here, we investigate the impact of oxytocin on resting-state connectivity between subcortical and cortical networks in women. We collected resting-state functional magnetic resonance imaging (fMRI) data on 26 typically developing women 40 min following intranasal oxytocin administration using a double-blind placebo-controlled crossover design...
April 18, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28417219/treatment-effect-of-methylphenidate-on-intrinsic-functional-brain-network-in-medication-na%C3%A3-ve-adhd-children-a-multivariate-analysis
#15
Jae Hyun Yoo, Dohyun Kim, Jeewook Choi, Bumseok Jeong
Methylphenidate is a first-line therapeutic option for treating attention-deficit/hyperactivity disorder (ADHD); however, elicited changes on resting-state functional networks (RSFNs) are not well understood. This study investigated the treatment effect of methylphenidate using a variety of RSFN analyses and explored the collaborative influences of treatment-relevant RSFN changes in children with ADHD. Resting-state functional magnetic resonance imaging was acquired from 20 medication-naïve ADHD children before methylphenidate treatment and twelve weeks later...
April 17, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28413234/high-dimensional-tests-for-functional-networks-of-brain-anatomic-regions
#16
Jichun Xie, Jian Kang
Exploring resting-state brain functional connectivity of autism spectrum disorders (ASD) using functional magnetic resonance imaging (fMRI) data has become a popular topic over the past few years. The data in a standard brain template consist of over 170,000 voxel specific points in time for each human subject. Such an ultra-high dimensionality makes the voxel-level functional connectivity analysis (involving four billion voxel pairs) both statistically and computationally inefficient. In this work, we introduce a new framework to identify the functional brain network at the anatomical region level for each individual...
April 2017: Journal of Multivariate Analysis
https://www.readbyqxmd.com/read/28412442/human-brain-mapping-a-systematic-comparison-of-parcellation-methods-for-the-human-cerebral-cortex
#17
REVIEW
Salim Arslan, Sofia Ira Ktena, Antonios Makropoulos, Emma C Robinson, Daniel Rueckert, Sarah Parisot
The macro-connectome elucidates the pathways through which brain regions are structurally connected or functionally coupled to perform a specific cognitive task. It embodies the notion of representing and understanding all connections within the brain as a network, while the subdivision of the brain into interacting functional units is inherent in its architecture. As a result, the definition of network nodes is one of the most critical steps in connectivity network analysis. Although brain atlases obtained from cytoarchitecture or anatomy have long been used for this task, connectivity-driven methods have arisen only recently, aiming to delineate more homogeneous and functionally coherent regions...
April 12, 2017: NeuroImage
https://www.readbyqxmd.com/read/28412440/transient-networks-of-spatio-temporal-connectivity-map-communication-pathways-in-brain-functional-systems
#18
Alessandra Griffa, Benjamin Ricaud, Kirell Benzi, Xavier Bresson, Alessandro Daducci, Pierre Vandergheynst, Jean-Philippe Thiran, Patric Hagmann
The study of brain dynamics enables us to characterize the time-varying functional connectivity among distinct neural groups. However, current methods suffer from the absence of structural connectivity information. We propose to integrate infra-slow neural oscillations and anatomical-connectivity maps, as derived from functional and diffusion MRI, in a multilayer-graph framework that captures transient networks of spatio-temporal connectivity. These networks group anatomically wired and temporary synchronized brain regions and encode the propagation of functional activity on the structural connectome...
April 12, 2017: NeuroImage
https://www.readbyqxmd.com/read/28410136/directed-connectivity-of-brain-default-networks-in-resting-state-using-gca-and-motif
#19
Zhuqing Jiao, Huan Wang, Kai Ma, Ling Zou, Jianbo Xiang
Nowadays, there is a lot of interest in assessing functional interactions between key brain regions. In this paper, Granger causality analysis (GCA) and motif structure are adopted to study directed connectivity of brain default mode networks (DMNs) in resting state. Firstly, the time series of functional magnetic resonance imaging (fMRI) data in resting state were extracted, and the causal relationship values of the nodes representing related brain regions are analyzed in time domain to construct a default network...
June 1, 2017: Frontiers in Bioscience (Landmark Edition)
https://www.readbyqxmd.com/read/28408865/tau-pathology-distribution-in-alzheimer-s-disease-corresponds-differentially-to-cognition-relevant-functional-brain-networks
#20
Oskar Hansson, Michel J Grothe, Tor Olof Strandberg, Tomas Ohlsson, Douglas Hägerström, Jonas Jögi, Ruben Smith, Michael Schöll
Neuropathological studies have shown that the typical neurofibrillary pathology of hyperphosphorylated tau protein in Alzheimer's disease (AD) preferentially affects specific brain regions whereas others remain relatively spared. It has been suggested that the distinct regional distribution profile of tau pathology in AD may be a consequence of the intrinsic network structure of the human brain. The spatially distributed brain regions that are most affected by the spread of tau pathology may hence reflect an interconnected neuronal system...
2017: Frontiers in Neuroscience
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