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Resting state functional connectivity

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https://www.readbyqxmd.com/read/28806599/resting-state-functional-connectivity-of-the-anterior-striatum-and-prefrontal-cortex-predicts-reading-performance-in-school-age-children
#1
Sarael Alcauter, Liliana García-Mondragón, Zeus Gracia-Tabuenca, Martha B Moreno, Juan J Ortiz, Fernando A Barrios
The current study investigated the neural basis of reading performance in 60 school-age Spanish-speaking children, aged 6 to 9years. By using a data-driven approach and an automated matching procedure, we identified a left-lateralized resting state network that included typical language regions (Wernicke's and Broca's regions), prefrontal cortex, pre- and post-central gyri, superior and middle temporal gyri, cerebellum, and subcortical regions, and explored its relevance for reading performance (accuracy, comprehension and speed)...
August 11, 2017: Brain and Language
https://www.readbyqxmd.com/read/28804783/functional-corticostriatal-connection-topographies-predict-goal-directed-behaviour-in-humans
#2
Andre F Marquand, Koen V Haak, Christian F Beckmann
Anatomical tracing studies in non-human primates have suggested that corticostriatal connectivity is topographically organized: nearby locations in striatum are connected with nearby locations in cortex. The topographic organization of corticostriatal connectivity is thought to underpin many goal-directed behaviours, but these topographies have not been completely characterised in humans and their relationship to uniquely human behaviours remains to be fully determined. Instead, the dominant approach employs parcellations that cannot model the continuous nature of the topography, nor accommodate overlapping cortical projections in the striatum...
August 2017: Nature Human Behaviour
https://www.readbyqxmd.com/read/28801920/restoration-of-thalamo-cortical-connectivity-after-brain-injury-recovery-of-consciousness-complex-behavior-or-passage-of-time
#3
Julia S Crone, Branden J Bio, Paul M Vespa, Evan S Lutkenhoff, Martin M Monti
In 2000, a landmark case report described the concurrent restoration of consciousness and thalamo-frontal connectivity after severe brain injury (Laureys et al., ). Being a single case however, this study could not disambiguate whether the result was specific to the restoration of consciousness per se as opposed to the return of complex cognitive function in general or simply the temporal evolution of post-injury pathophysiological events. To test whether the restoration of thalamo-cortical connectivity is specific to consciousness, 20 moderate-to-severe brain injury patients (from a recruited sample of 42) underwent resting-state functional magnetic resonance imaging within a week after injury and again six months later...
August 12, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/28801672/sample-entropy-reveals-an-age-related-reduction-in-the-complexity-of-dynamic-brain
#4
Yanbing Jia, Huaguang Gu, Qiang Luo
Dynamic reconfiguration of the human brain is characterized by the nature of complexity. The purpose of this study was to measure such complexity and also analyze its association with age. We modeled the dynamic reconfiguration process by dynamic functional connectivity, which was established by resting-state functional magnetic resonance imaging (fMRI) data, and we measured complexity within the dynamic functional connectivity by sample entropy (SampEn). A brainwide map of SampEn in healthy subjects shows larger values in the caudate, the olfactory gyrus, the amygdala, and the hippocampus, and lower values in primary sensorimotor and visual areas...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28798808/altered-brain-functional-connectivity-in-small-cell-lung-cancer-patients-after-chemotherapy-treatment-a-resting-state-fmri-study
#5
Konstantinos Bromis, Kostakis Gkiatis, Irene Karanasiou, George Matsopoulos, Eustratios Karavasilis, Matilda Papathanasiou, Efstathios Efstathopoulos, Nikolaos Kelekis, Vasileios Kouloulias
Previous studies in small-cell lung cancer (SCLC) patients have mainly focused on exploring neurocognitive deficits associated with prophylactic cranial irradiation (PCI). Little is known about functional brain alterations that might occur due to chemotherapy treatment in this population before PCI is administered. For this reason, we used resting-state functional Magnetic Resonance Imaging (fMRI) to examine potential functional connectivity disruptions in brain networks, including the Default Mode Network (DMN), the Sensorimotor Network, and the Task-Positive Network (TPN)...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28796604/dual-temporal-and-spatial-sparse-representation-for-inferring-group-wise-brain-networks-from-resting-state-fmri-dataset
#6
Junhui Gong, Xiaoyan Liu, Tianming Liu, Jiansong Zhou, Gang Sun, Juanxiu Tian
Recently, sparse representation has been successfully used to identify brain networks from task-based fMRI dataset. However, when using the strategy to analyze resting-state fMRI dataset, it is still a challenge to automatically infer the group-wise brain networks under consideration of group commonalities and subject-specific characteristics. In the paper, a novel method based on dual temporal and spatial sparse representation (DTSSR) is proposed to meet this challenge. Firstly, the brain functional networks with subject-specific characteristics are obtained via sparse representation with online dictionary learning for the fMRI time series (temporal domain) of each subject...
August 9, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28795168/changes-in-brain-behavior-relationships-following-a-3-month-pilot-cognitive-intervention-program-for-adults-with-traumatic-brain-injury
#7
S Porter, I J Torres, W Panenka, Z Rajwani, D Fawcett, A Hyder, N Virji-Babul
Facilitating functional recovery following brain injury is a key goal of neurorehabilitation. Direct, objective measures of changes in the brain are critical to understanding how and when meaningful changes occur, however, assessing neuroplasticity using brain based results remains a significant challenge. Little is known about the underlying changes in functional brain networks that correlate with cognitive outcomes in traumatic brain injury (TBI). The purpose of this pilot study was to assess the feasibility of an intensive three month cognitive intervention program in individuals with chronic TBI and to evaluate the effects of this intervention on brain-behavioral relationships...
August 2017: Heliyon
https://www.readbyqxmd.com/read/28794980/connectivity-of-precuneus-to-the-default-mode-and-dorsal-attention-networks-a-possible-invariant-marker-of-long-term-tinnitus
#8
Sara A Schmidt, Jake Carpenter-Thompson, Fatima T Husain
Resting state functional connectivity studies of tinnitus have provided inconsistent evidence concerning its neural bases. This may be due to differences in the methodology used, but it is also likely related to the heterogeneity of the tinnitus population. In this study, our goal was to identify resting state functional connectivity alterations that consistently appear across tinnitus subgroups. We examined two sources of variability in the subgroups: tinnitus severity and the length of time a person has had chronic tinnitus (referred to as tinnitus duration)...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28794974/resting-state-functional-connectivity-changes-due-to-acute-and-short-term-valproic-acid-administration-in-the-baboon-model-of-gge
#9
Felipe S Salinas, Charles Ákos Szabó
Resting-state functional connectivity (FC) is altered in baboons with genetic generalized epilepsy (GGE) compared to healthy controls (CTL). We compared FC changes between GGE and CTL groups after intravenous injection of valproic acid (VPA) and following one-week of orally administered VPA. Seven epileptic (2 females) and six CTL (3 females) baboons underwent resting-state fMRI (rs-fMRI) at 1) baseline, 2) after intravenous acute VPA administration (20 mg/kg), and 3) following seven-day oral, subacute VPA therapy (20-80 mg/kg/day)...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28793242/frequency-specific-alteration-of-functional-connectivity-density-in-antipsychotic-naive-adolescents-with-early-onset-schizophrenia
#10
Xiao Wang, Yan Zhang, Zhiliang Long, Junjie Zheng, Youxue Zhang, Shaoqiang Han, Yifeng Wang, Xujun Duan, Mi Yang, Jingping Zhao, Huafu Chen
Early-onset schizophrenia (EOS) is a severe mental illness associated with dysconnectivity that widespread in the brain. However, the functional dysconnectivity in EOS are still mixed. Recently, studies have identified that functional connectivity (FC) arises from a band-limited slow rhythmic mechanism and suggested that the dysconnectivity at specific frequency bands may provide more robust biomarkers for schizophrenia. The frequency-specific changes of FC pattern in EOS remain unclear. To address this issue, resting-state functional magnetic resonance imaging data scans from 39 EOS patients (drug-naive) and 31 healthy controls (HCs) were used to assess the FC density (FCD) across slow-4 (0...
July 19, 2017: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/28792155/altered-functional-connectivity-of-the-default-mode-network-in-low-empathy-subjects
#11
Seung Jun Kim, Sung Eun Kim, Hyo Eun Kim, Kiwan Han, Bumseok Jeong, Jae Jin Kim, Kee Namkoong, Ji Woong Kim
Empathy is the ability to identify with or make a vicariously experience of another person's feelings or thoughts based on memory and/or self-referential mental simulation. The default mode network in particular is related to self-referential empathy. In order to elucidate the possible neural mechanisms underlying empathy, we investigated the functional connectivity of the default mode network in subjects from a general population. Resting state functional magnetic resonance imaging data were acquired from 19 low-empathy subjects and 18 medium-empathy subjects...
September 2017: Yonsei Medical Journal
https://www.readbyqxmd.com/read/28792117/intrinsic-functional-connectivity-variance-and-state-specific-under-connectivity-in-autism
#12
Heng Chen, Jason S Nomi, Lucina Q Uddin, Xujun Duan, Huafu Chen
Autism spectrum disorder (ASD) is a neurodevelopmental condition associated with altered brain connectivity. Previous neuroimaging research demonstrates inconsistent results, particularly in studies of functional connectivity in ASD. Typically, these inconsistent findings are results of studies using static measures of resting-state functional connectivity. Recent work has demonstrated that functional brain connections are dynamic, suggesting that static connectivity metrics fail to capture nuanced time-varying properties of functional connections in the brain...
August 9, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28790829/the-regional-neuronal-activity-in-left-posterior-middle-temporal-gyrus-is-correlated-with-the-severity-of-chronic-aphasia
#13
Jianlin Li, Dunren Du, Wei Gao, Xichun Sun, Haizhu Xie, Gang Zhang, Jian Li, Honglun Li, Kefeng Li
BACKGROUND: Aphasia is one of the most disabling cognitive deficits affecting >2 million people in the USA. The neuroimaging characteristics of chronic aphasic patients (>6 months post onset) remain largely unknown. OBJECTIVE: The objective of this study was to investigate the regional signal changes of spontaneous neuronal activity of brain and the inter-regional connectivity in chronic aphasia. MATERIALS AND METHODS: Resting-state blood oxygenation level-dependent functional magnetic resonance imaging (fMRI) was used to obtain fMRI data from 17 chronic aphasic patients and 20 healthy control subjects in a Siemens Verio 3...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/28790433/a-neural-marker-of-obsessive-compulsive-disorder-from-whole-brain-functional-connectivity
#14
Yu Takagi, Yuki Sakai, Giuseppe Lisi, Noriaki Yahata, Yoshinari Abe, Seiji Nishida, Takashi Nakamae, Jun Morimoto, Mitsuo Kawato, Jin Narumoto, Saori C Tanaka
Obsessive-compulsive disorder (OCD) is a common psychiatric disorder with a lifetime prevalence of 2-3%. Recently, brain activity in the resting state is gathering attention for exploring altered functional connectivity in psychiatric disorders. Although previous resting-state functional magnetic resonance imaging studies investigated the neurobiological abnormalities of patients with OCD, there are concerns that should be addressed. One concern is the validity of the hypothesis employed. Most studies used seed-based analysis of the fronto-striatal circuit, despite the potential for abnormalities in other regions...
August 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28783763/mapping-altered-brain-connectivity-and-its-clinical-associations-in-adult-moyamoya-disease-a-resting-state-functional-mri-study
#15
Ken Kazumata, Khin Khin Tha, Haruto Uchino, Masaki Ito, Naoki Nakayama, Takeo Abumiya
Detection of subtle ischemic injuries in moyamoya disease may enable optimization of timing of revascularization surgery, and could potentially improve functional outcomes. Resting-state functional magnetic resonance imaging (rs-fMRI) is widely used to study functional organization of the brain, but it remains unclear whether rs-fMRI could elucidate distinct characteristics in moyamoya disease. Here, we aimed to determine changes in a conventional rs-fMRI measure and analyze any associations with clinical symptoms and cerebral hemodynamics...
2017: PloS One
https://www.readbyqxmd.com/read/28782871/combining-task-related-activation-and-connectivity-analysis-of-fmri-data-reveals-complex-modulation-of-brain-networks
#16
Martin Fungisai Gerchen, Peter Kirsch
Task-related effects in functional magnetic resonance imaging (fMRI) data are usually analyzed with local activation approaches or integrative connectivity approaches, for example, by psychophysiological interaction (PPI) analysis. While both approaches are often applied to the same data set, a systematic combination of the results with a whole-brain (WB) perspective is rarely conducted and the relationship between task-dependent activation and connectivity effects is relatively unexplored. Here, we combined brain activation and graph theoretical analysis of WB-PPI results in an exemplary episodic memory data set of N = 136 healthy human participants and found regions with congruent as well as incongruent activation and connectivity changes between task and control conditions...
August 7, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28782681/a-bayesian-spatial-model-for-neuroimaging-data-based-on-biologically-informed-basis-functions
#17
Ismael Huertas, Marianne Oldehinkel, Erik S B van Oort, David Garcia-Solis, Pablo Mir, Christian F Beckmann, Andre F Marquand
The dominant approach to neuroimaging data analysis employs the voxel as the unit of computation. While convenient, voxels lack biological meaning and their size is arbitrarily determined by the resolution of the image. Here, we propose a multivariate spatial model in which neuroimaging data is characterized as a linearly weighted combination of multiscale basis functions which map onto underlying brain nuclei or networks or nuclei. In this model, the elementary building blocks are derived to reflect the functional anatomy of the brain during the resting state...
August 4, 2017: NeuroImage
https://www.readbyqxmd.com/read/28782678/resting-state-networks-in-empirical-and-simulated-dynamic-functional-connectivity
#18
Katharina Glomb, Adrián Ponce-Alvarez, Matthieu Gilson, Petra Ritter, Gustavo Deco
It is well-established that patterns of functional connectivity (FC) - measures of correlated activity between pairs of voxels or regions observed in the human brain using neuroimaging - are robustly expressed in spontaneous activity during rest. These patterns are not static, but exhibit complex spatio-temporal dynamics. Over the last years, a multitude of methods have been proposed to reveal these dynamics on the level of the whole brain. One finding is that the brain transitions through different FC configurations over time, and substantial effort has been put into characterizing these configurations...
August 3, 2017: NeuroImage
https://www.readbyqxmd.com/read/28782373/correlating-resting-state-functional-mri-connectivity-by-independent-component-analysis-based-epileptogenic-zones-with-intracranial-eeg-localized-seizure-onset-zones-and-surgical-outcomes-in-prospective-pediatric-intractable-epilepsy-study
#19
Varina Boerwinkle, Deepankar Mohanty, Stephen Foldes, Danielle Guffey, Charles G Minard, Lucia Mirea, Aditya Vedantam, Jeffery S Raskin, Sandi Lam, Margaret Bond, P David Adelson, Angus A Wilfong, Daniel J Curry
OBJECTIVE: Prospective investigation determining agreement between the epileptogenic zone(s) (EZ) localization by resting state functional MRI (rs-fMRI) and the seizure onset zone(s) (SOZ) identified by intracranial EEG (ic-EEG) using novel differentiating and ranking criteria of rs-fMRI abnormal independent components in a consecutive heterogeneous pediatric intractable epilepsy population prospectively was conducted. METHODS: The EZ criteria were developed from an initial cohort of 350 patients evaluated for epilepsy surgery over a 3-year period...
August 7, 2017: Brain Connectivity
https://www.readbyqxmd.com/read/28780401/task-based-dynamic-functional-connectivity-recent-findings-and-open-questions
#20
REVIEW
Javier Gonzalez-Castillo, Peter A Bandettini
The temporal evolution of functional connectivity (FC) within the confines of individual scans is nowadays often explored with functional neuroimaging. This is particularly true for resting-state; yet, FC-dynamics have also been investigated as subjects engage on numerous tasks. It is these research efforts that constitute the core of this survey. First, empirical observations on how FC differs between task and rest-independent of temporal scale-are reviewed, as they underscore how, despite overall preservation of network topography, the brain's FC does reconfigure in systematic ways to accommodate task demands...
August 2, 2017: NeuroImage
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