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Resting state fMRI

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https://www.readbyqxmd.com/read/29028135/predicting-episodic-and-spatial-memory-performance-from-hippocampal-resting-state-functional-connectivity-evidence-for-an-anterior-posterior-division-of-function
#1
Jonas Persson, Eva Stening, Kristin Nordin, Hedvig Söderlund
fMRI studies have identified distinct resting-state functional connectivity (RSFC) networks associated with the anterior and posterior hippocampus. However, the functional relevance of these two networks is still largely unknown. Hippocampal lesion studies and task-related fMRI point to a role for the anterior hippocampus in non-spatial episodic memory and the posterior hippocampus in spatial memory. We used Relevance Vector Regression (RVR), a machine-learning method that enables predictions of continuous outcome measures from multivariate patterns of brain imaging data, to test the hypothesis that patterns of whole-brain RSFC associated with the anterior hippocampus predict episodic memory performance, while patterns of whole-brain RSFC associated with the posterior hippocampus predict spatial memory performance...
October 13, 2017: Hippocampus
https://www.readbyqxmd.com/read/29025324/the-effects-of-head-cooling-on-brain-function-during-passive-hyperthermia-an-fmri-study
#2
Yan Xue, Li Li, Shaowen Qian, Kai Liu, Xiaohong Joe Zhou, Bo Li, Qingjun Jiang, Zhuanzhuan Wu, Lexia Du, Gang Sun
PURPOSE: To investigate the effect of head-cooling on resting-state spontaneous brain activity during passive hyperthermia. METHODS: An environmental heat exposure was simulated on 16 healthy men under a normal control condition (NC) at 25°C and two hot conditions at 50°C with (HHC) and without (HOT) keeping the head cool, respectively. Resting-state functional MRI (fMRI) data were acquired under each condition and the values of amplitude low frequency fluctuations (ALFF) and z functional connectivity (zFC) were computed to examine regional activity and functional integration, respectively...
October 12, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/29024679/short-range-connections-in-the-developmental-connectome-during-typical-and-atypical-brain-maturation
#3
REVIEW
Minhui Ouyang, Huiying Kang, John A Detre, Timothy P L Roberts, Hao Huang
The human brain is remarkably complex with connectivity constituting its basic organizing principle. Although long-range connectivity has been focused on in most research, short-range connectivity is characterized by unique and spatiotemporally heterogeneous dynamics from infancy to adulthood. Alterations in the maturational dynamics of short-range connectivity has been associated with neuropsychiatric disorders, such as autism and schizophrenia. Recent advances in neuroimaging techniques, especially diffusion magnetic resonance imaging (dMRI), resting-state functional MRI (rs-fMRI), electroencephalography (EEG) and magnetoencephalography (MEG), have made quantification of short-range connectivity possible in pediatric populations...
October 9, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/29024299/reproducibility-of-r-fmri-metrics-on-the-impact-of-different-strategies-for-multiple-comparison-correction-and-sample-sizes
#4
Xiao Chen, Bin Lu, Chao-Gan Yan
Concerns regarding reproducibility of resting-state functional magnetic resonance imaging (R-fMRI) findings have been raised. Little is known about how to operationally define R-fMRI reproducibility and to what extent it is affected by multiple comparison correction strategies and sample size. We comprehensively assessed two aspects of reproducibility, test-retest reliability and replicability, on widely used R-fMRI metrics in both between-subject contrasts of sex differences and within-subject comparisons of eyes-open and eyes-closed (EOEC) conditions...
October 11, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/29024197/multifaceted-brain-networks-reconfiguration-in-disorders-of-consciousness-uncovered-by-co-activation-patterns
#5
Carol Di Perri, Enrico Amico, Lizette Heine, Jitka Annen, Charlotte Martial, Stephen K Larroque, Andrea Soddu, Daniele Marinazzo, Steven Laureys
INTRODUCTION: Given that recent research has shown that functional connectivity is not a static phenomenon, we aim to investigate the dynamic properties of the default mode network's (DMN) connectivity in patients with disorders of consciousness. METHODS: Resting-state fMRI volumes of a convenience sample of 17 patients in unresponsive wakefulness syndrome (UWS) and controls were reduced to a spatiotemporal point process by selecting critical time points in the posterior cingulate cortex (PCC)...
October 11, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/29017089/reduced-interhemispheric-executive-control-network-coupling-in-men-during-early-cocaine-abstinence-a-pilot-study
#6
Julie M McCarthy, Chun S Zuo, Justin M Shepherd, Nadeeka Dias, Scott E Lukas, Amy C Janes
BACKGROUND: Individuals who use cocaine have fewer cognitive resources needed to maintain abstinence. This is evidenced by blunted brain function during cognitive control tasks and reduced communication between brain regions associated with cognitive function. For instance, relapse vulnerability is heightened in individuals with less communication between the right and left frontoparietal executive control network (ECN). Given that recent cocaine use enhances such communication, it is plausible that recency of cocaine use influences interhemispheric ECN communication...
October 5, 2017: Drug and Alcohol Dependence
https://www.readbyqxmd.com/read/29017061/decreased-functional-connectivity-in-schizophrenia-the-relationship-between-social-functioning-social-cognition-and-graph-theoretical-network-measures
#7
Burak Erdeniz, Emin Serin, Yelda İbadi, Cumhur Taş
Schizophrenia is a complex disorder in which abnormalities in brain connectivity and social functioning play a central role. The aim of this study is to explore small-world network properties, and understand their relationship with social functioning and social cognition in the context of schizophrenia, by testing functional connectivity differences in network properties and its relation to clinical behavioral measures. Resting-state fMRI time series data were acquired from 23 patients diagnosed with schizophrenia and 23 healthy volunteers...
September 28, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/29016686/learning-about-learning-mining-human-brain-sub-network-biomarkers-from-fmri-data
#8
Petko Bogdanov, Nazli Dereli, Xuan-Hong Dang, Danielle S Bassett, Nicholas F Wymbs, Scott T Grafton, Ambuj K Singh
Modeling the brain as a functional network can reveal the relationship between distributed neurophysiological processes and functional interactions between brain structures. Existing literature on functional brain networks focuses mainly on a battery of network properties in "resting state" employing, for example, modularity, clustering, or path length among regions. In contrast, we seek to uncover functionally connected subnetworks that predict or correlate with cohort differences and are conserved within the subjects within a cohort...
2017: PloS One
https://www.readbyqxmd.com/read/28988830/effects-of-neonatal-deafness-on-resting-state-functional-network-connectivity
#9
Daniel Stolzberg, Blake E Butler, Stephen G Lomber
Normal brain development depends on early sensory experience. Behavioral consequences of brain maturation in the absence of sensory input early in life are well documented. For example, experiments with mature, neonatally deaf human or animal subjects have revealed improved peripheral visual motion detection and spatial localization abilities. Such supranormal behavioral abilities in the nondeprived sensory modality are evidence of compensatory plasticity occurring in deprived brain regions at some point or throughout development...
October 5, 2017: NeuroImage
https://www.readbyqxmd.com/read/28985929/ten-key-observations-on-the-analysis-of-resting-state-functional-mr-imaging-data-using-independent-component-analysis
#10
REVIEW
Vince D Calhoun, Nina de Lacy
For more than 20 years, the powerful, flexible family of independent component analysis (ICA) techniques has been used to examine spatial, temporal, and subject variation in functional magnetic resonance (fMR) imaging data. This article provides an overview of 10 key principles in the basic and advanced application of ICA to resting-state fMR imaging. ICA's core advantages include robustness to artifact; false-positives and autocorrelation; adaptability to variant study designs; agnosticism to the temporal evolution of fMR imaging signals; and ability to extract, identify, and analyze neural networks...
November 2017: Neuroimaging Clinics of North America
https://www.readbyqxmd.com/read/28983238/unique-neural-characteristics-of-atypical-lateralization-of-language-in-healthy-individuals
#11
Szymon P Biduła, Łukasz Przybylski, Mikołaj A Pawlak, Gregory Króliczak
Using functional magnetic resonance imaging (fMRI) in 63 healthy participants, including left-handed and ambidextrous individuals, we tested how atypical lateralization of language-i. e., bilateral or right hemispheric language representation-differs from the typical left-hemisphere dominance. Although regardless of their handedness, all 11 participants from the atypical group engaged classical language centers, i.e., Broca's and Wernicke's areas, the right-hemisphere components of the default mode network (DMN), including the angular gyrus and middle temporal gyrus, were also critically involved during the verbal fluency task...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28981917/aberrant-default-mode-network-hippocampus-connectivity-after-sad-memory-recall-in-remitted-depression
#12
Caroline A Figueroa, Roel J T Mocking, Guido van Wingen, Suzanne Martens, Henricus G Ruhé, Aart H Schene
Rumination and cognitive reactivity (dysfunctional cognitions after sad mood-induction) remain high in remitted Major Depressive Disorder (MDD) and can contribute to new episodes. These factors have been linked to increased fMRI resting-state functional-connectivity within the Default-Mode Network (DMN). It remains unclear whether (I) increased DMN-connectivity persists during MDD-remission, and (II) whether sad mood-induction differentially affects DMN-connectivity in remitted-MDD versus controls. Moreover, DMN-connectivity studies in remitted-MDD were previously confounded by antidepressant-use...
September 13, 2017: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/28981827/emotional-intelligence-is-associated-with-connectivity-within-and-between-resting-state-networks
#13
William D S Killgore, Ryan Smith, Elizabeth A Olson, Mareen Weber, Scott L Rauch, Lisa D Nickerson
Emotional intelligence (EI) is defined as an individual's capacity to accurately perceive, understand, reason about, and regulate emotions, and to apply that information to facilitate thought and achieve goals. Although EI plays an important role in mental health and success in academic, professional and social realms, the neurocircuitry underlying this capacity remains poorly characterized, and no study to date has yet examined the relationship between EI and intrinsic neural network function. Here, in a sample of 54 healthy individuals (28 women, 26 men), we apply independent components analysis (ICA) with dual regression to functional magnetic resonance imaging (fMRI) data acquired while subjects were resting in the scanner to investigate brain circuits (intrinsic resting state networks) whose activity is associated with greater self-reported (i...
September 4, 2017: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/28981635/linking-entropy-at-rest-with-the-underlying-structural-connectivity-in-the-healthy-and-lesioned-brain
#14
Victor M Saenger, Adrián Ponce-Alvarez, Mohit Adhikari, Patric Hagmann, Gustavo Deco, Maurizio Corbetta
The brain is a network that mediates information processing through a wide range of states. The extent of state diversity is a reflection of the entropy of the network. Here we measured the entropy of brain regions (nodes) in empirical and modeled functional networks reconstructed from resting state fMRI to address the connection of entropy at rest with the underlying structure measured through diffusion spectrum imaging. Using 18 empirical and 18 modeled stroke networks, we also investigated the effect that focal lesions have on node entropy and information diffusion...
July 13, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28981612/local-global-parcellation-of-the-human-cerebral-cortex-from-intrinsic-functional-connectivity-mri
#15
Alexander Schaefer, Ru Kong, Evan M Gordon, Timothy O Laumann, Xi-Nian Zuo, Avram J Holmes, Simon B Eickhoff, B T Thomas Yeo
A central goal in systems neuroscience is the parcellation of the cerebral cortex into discrete neurobiological "atoms". Resting-state functional magnetic resonance imaging (rs-fMRI) offers the possibility of in vivo human cortical parcellation. Almost all previous parcellations relied on 1 of 2 approaches. The local gradient approach detects abrupt transitions in functional connectivity patterns. These transitions potentially reflect cortical areal boundaries defined by histology or visuotopic fMRI. By contrast, the global similarity approach clusters similar functional connectivity patterns regardless of spatial proximity, resulting in parcels with homogeneous (similar) rs-fMRI signals...
July 18, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28981541/contrasting-resting-state-fmri-abnormalities-from-sickle-and-non-sickle-anemia
#16
Julie Coloigner, Yeun Kim, Adam Bush, Soyoung Choi, Melissa C Balderrama, Thomas D Coates, Sharon H O'Neil, Natasha Lepore, John C Wood
Sickle cell disease (SCD) is a chronic blood disorder that is often associated with acute and chronic cerebrovascular complications, including strokes and impaired cognition. Using functional resting state magnetic resonance images, we performed whole-brain analysis of the amplitude of low frequency fluctuations (ALFF), to detect areas of spontaneous blood oxygenation level dependent signal across brain regions. We compared the ALFF of 20 SCD patients to that observed in 19 healthy, age and ethnicity-matched, control subjects...
2017: PloS One
https://www.readbyqxmd.com/read/28977527/two-days-sleep-debt-causes-mood-decline-during-resting-state-via-diminished-amygdala-prefrontal-connectivity
#17
Yuki Motomura, Ruri Katsunuma, Michitaka Yoshimura, Kazuo Mishima
Study objectives: Sleep debt has been suggested to evoke emotional instability by diminishing the suppression of the amygdala by the medial prefrontal cortex (MPFC). Here, we investigated how short-term sleep debt affects resting-state functional connectivity between the amygdala and MPFC, subjective mood, and sleep parameters. Methods: Eighteen healthy adult men aged 29±8.24 years participated in a 2-day sleep control session (SC; time in bed, 9 h) and 2-day sleep debt session (SD; time in bed, 3 h)...
July 29, 2017: Sleep
https://www.readbyqxmd.com/read/28977523/resting-state-functional-connectivity-based-biomarkers-and-functional-mri-based-neurofeedback-for-psychiatric-disorders-a-challenge-for-developing-theranostic-biomarkers
#18
Takashi Yamada, Ryu-Ichiro Hashimoto, Noriaki Yahata, Naho Ichikawa, Yujiro Yoshihara, Yasumasa Okamoto, Nobumasa Kato, Hidehiko Takahashi, Mitsuo Kawato
Psychiatric research has been hampered by an explanatory gap between psychiatric symptoms and their neural underpinnings, which has resulted in poor treatment outcomes. This situation has prompted us to shift from symptom-based diagnosis to data-driven diagnosis, aiming to redefine psychiatric disorders as disorders of neural circuitry. Promising candidates for data-driven diagnosis include resting-state functional connectivity MRI (rs-fcMRI)-based biomarkers. Although biomarkers have been developed with the aim of diagnosing patients and predicting the efficacy of therapy, the focus has shifted to the identification of biomarkers that represent therapeutic targets, which would allow for more personalized treatment approaches...
October 1, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28971331/resting-state-functional-magnetic-resonance-imaging-in-clade-c-hiv-within-group-association-with-neurocognitive-function
#19
Lindie du Plessis, Robert H Paul, Jackie Hoare, Dan J Stein, Paul A Taylor, Ernesta M Meintjes, John A Joska
Neuroimaging abnormalities are common in chronically infected HIV-positive individuals. The majority of studies have focused on structural or functional brain outcomes in samples infected with clade B HIV. While preliminary work reveals a similar structural imaging phenotype in patients infected with clade C HIV, no study has examined functional connectivity (FC) using resting-state functional magnetic resonance imaging (rs-fMRI) in clade C HIV. In particular, we were interested to explore HIV-only effects on neurocognitive function using associations with rs-fMRI...
October 2, 2017: Journal of Neurovirology
https://www.readbyqxmd.com/read/28971013/presurgical-thalamocortical-connectivity-is-associated-with-response-to-vagus-nerve-stimulation-in-children-with-intractable-epilepsy
#20
George M Ibrahim, Priya Sharma, Ann Hyslop, Magno R Guillen, Benjamin R Morgan, Simeon Wong, Taylor J Abel, Lior Elkaim, Iahn Cajigas, Ashish H Shah, Aria Fallah, Alexander G Weil, Nolan Altman, Byron Bernal, Santiago Medina, Elysa Widjaja, Prasanna Jayakar, John Ragheb, Sanjiv Bhatia
Although chronic vagus nerve stimulation (VNS) is an established treatment for medically-intractable childhood epilepsy, there is considerable heterogeneity in seizure response and little data are available to pre-operatively identify patients who may benefit from treatment. Since the therapeutic effect of VNS may be mediated by afferent projections to the thalamus, we tested the hypothesis that intrinsic thalamocortical connectivity is associated with seizure response following chronic VNS in children with epilepsy...
2017: NeuroImage: Clinical
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