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"Dynamic functional connectivity"

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https://www.readbyqxmd.com/read/29153446/the-instability-of-functional-connectivity-in-patients-with-schizophrenia-and-their-siblings-a-dynamic-connectivity-study
#1
Shuixia Guo, Wei Zhao, Haojuan Tao, Zhening Liu, Lena Palaniyappan
BACKGROUND: The distributed connectivity among brain regions is in a constant state of flux, even when a subject is at rest. This instability (temporal variability), when optimal, may contribute to efficient cross-network communications. We investigate the role of this variability in the genetic diathesis and symptom expression of schizophrenia. METHODS: Resting state functional MRI data acquired from 116 subjects (28 patients with schizophrenia, 28 siblings and 60 matched healthy controls)...
November 15, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/29152994/decreased-connectivity-and-increased-bold-complexity-in-the-default-mode-network-in-individuals-with-chronic-fatigue-syndrome
#2
Zack Y Shan, Kevin Finegan, Sandeep Bhuta, Timothy Ireland, Donald R Staines, Sonya M Marshall-Gradisnik, Leighton R Barnden
The chronic fatigue syndrome / myalgic encephalomyelitis (CFS) is a debilitating disease with unknown pathophysiology and no diagnostic test. This study investigated the default mode network (DMN) in order to understand the pathophysiology of CFS and to identify potential biomarkers. Using functional MRI (fMRI) collected from 72 subjects (45 CFS and 27 controls) with a temporal resolution of 0.798s, we evaluated the default mode network using static functional connectivity (FC), dynamic functional connectivity (DFC) and DFC complexity, blood oxygenation level dependent (BOLD) activation maps and complexity of activity...
November 20, 2017: Brain Connectivity
https://www.readbyqxmd.com/read/29136310/brain-networks-of-the-imaginative-mind-dynamic-functional-connectivity-of-default-and-cognitive-control-networks-relates-to-openness-to-experience
#3
Roger E Beaty, Qunlin Chen, Alexander P Christensen, Jiang Qiu, Paul J Silvia, Daniel L Schacter
Imagination and creative cognition are often associated with the brain's default network (DN). Recent evidence has also linked cognitive control systems to performance on tasks involving imagination and creativity, with a growing number of studies reporting functional interactions between cognitive control and DN regions. We sought to extend the emerging literature on brain dynamics supporting imagination by examining individual differences in large-scale network connectivity in relation to Openness to Experience, a personality trait typified by imagination and creativity...
November 14, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/29081741/an-effective-method-to-identify-adolescent-generalized-anxiety-disorder-by-temporal-features-of-dynamic-functional-connectivity
#4
Zhijun Yao, Mei Liao, Tao Hu, Zhe Zhang, Yu Zhao, Fang Zheng, Jürg Gutknecht, Dennis Majoe, Bin Hu, Lingjiang Li
Generalized anxiety disorder (GAD) is one of common anxiety disorders in adolescents. Although adolescents with GAD are thought to be at high risk for other mental diseases, the disease-specific alterations have not been adequately explored. Recent studies have revealed the abnormal functional connectivity (FC) in adolescents with GAD. Most previous researches have investigated the static FC which ignores the fluctuations of FC over time and focused on the structures of "fear circuit". To figure out the alterations of dynamic FC caused by GAD and the possibilities of dynamic FC as biomarkers, we propose an effective approach to identify adolescent GAD using temporal features derived from dynamic FC...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29060812/decreased-variability-of-dynamic-phase-synchronization-in-brain-networks-during-hand-movement
#5
Lin Cheng, Hong Zhu, Yang Zhu, Naying He, Yang Yang, Huawei Ling, Shanbao Tong, Yi Fu, Junfeng Sun
Dynamic functional connectivity analysis, a rapidly growing method, has been demonstrated to provide new spatiotemporal information about how brain motor network would reorganize from rest to motor tasks. Phase synchronization analysis, which has been widely applied in EEG-based FC analysis, is a promising alternative method in dynamic FC analysis. In this study, fMRI data were recorded from 28 healthy volunteers when they are resting and performing hand closing and opening (HCO) task. Dynamic FC was estimated by phase synchronization analysis...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060604/dynamical-brain-connectivity-estimation-using-garch-models-an-application-to-personality-neuroscience
#6
R Riccelli, L Passamonti, A Duggento, M Guerrisi, I Indovina, A Terracciano, N Toschi
It has recently become evident that the functional connectome of the human brain is a dynamical entity whose time evolution carries important information underpinning physiological brain function as well as its disease-related aberrations. While simple sliding window approaches have had some success in estimating dynamical brain connectivity in a functional MRI (fMRI) context, these methods suffer from limitations related to the arbitrary choice of window length and limited time resolution. Recently, Generalized autoregressive conditional heteroscedastic (GARCH) models have been employed to generate dynamical covariance models which can be applied to fMRI...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060514/gender-differences-in-dynamic-functional-connectivity-based-on-resting-state-fmri
#7
Nini Mao, Hongna Zheng, Zhiying Long, Li Yao, Xia Wu
Many neuroscience studies have found brain differences lead to the gender differences in behavior and cognitive ability. Functional connectivity is a common and effective measure to characterize brain. Most current studies based on fMRI functional connectivity basically assumed temporal stationarity across the duration of scanning, and thought that brain functional connectivity was constant in a certain period of time. However, some studies revealed that the functional connectivity was dynamic and fluctuant over time...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29053835/abnormal-intrinsic-brain-functional-network-dynamics-in-parkinson-s-disease
#8
Jinhee Kim, Marion Criaud, Sang Soo Cho, María Díez-Cirarda, Alexander Mihaescu, Sarah Coakeley, Christine Ghadery, Mikaeel Valli, Mark F Jacobs, Sylvain Houle, Antonio P Strafella
No abstract text is available yet for this article.
November 1, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29048582/salience-network-dynamics-underlying-successful-resistance-of-temptation
#9
Rosa Steimke, Jason S Nomi, Vince D Calhoun, Christine Stelzel, Lena M Paschke, Robert Gaschler, Thomas Goschke, Henrik Walter, Lucina Q Uddin
Self-control and the ability to resist temptation are critical for successful completion of long-term goals. Contemporary models in cognitive neuroscience emphasize the primary role of prefrontal cognitive control networks in aligning behavior with such goals. Here we use gaze pattern analysis and dynamic functional connectivity fMRI data to explore how individual differences in the ability to resist temptation are related to intrinsic brain dynamics of the cognitive control and salience networks. Behaviorally, individuals exhibit greater gaze distance from target location (e...
October 18, 2017: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/29038030/dynamic-functional-connectivity-impairments-in-early-schizophrenia-and-clinical-high-risk-for-psychosis
#10
REVIEW
Yuhui Du, Susanna L Fryer, Zening Fu, Dongdong Lin, Jing Sui, Jiayu Chen, Eswar Damaraju, Eva Mennigen, Barbara Stuart, Rachel L Loewy, Daniel H Mathalon, Vince D Calhoun
Individuals at clinical high-risk (CHR) for psychosis are characterized by attenuated psychotic symptoms. Only a minority of CHR individuals convert to full-blown psychosis. Therefore, there is a strong interest in identifying neurobiological abnormalities underlying the psychosis risk syndrome. Dynamic functional connectivity (DFC) captures time-varying connectivity over short time scales, and has the potential to reveal complex brain functional organization. Based on resting-state functional magnetic resonance imaging (fMRI) data from 70 healthy controls (HCs), 53 CHR individuals, and 58 early illness schizophrenia (ESZ) patients, we applied a novel group information guided ICA (GIG-ICA) to estimate inherent connectivity states from DFC, and then investigated group differences...
October 14, 2017: NeuroImage
https://www.readbyqxmd.com/read/28988134/dynamics-of-large-scale-electrophysiological-networks-a-technical-review
#11
REVIEW
George C O'Neill, Prejaas Tewarie, Diego Vidaurre, Lucrezia Liuzzi, Mark W Woolrich, Matthew J Brookes
For several years it has been argued that neural synchronisation is crucial for cognition. The idea that synchronised temporal patterns between different neural groups carries information above and beyond the isolated activity of these groups has inspired a shift in focus in the field of functional neuroimaging. Specifically, investigation into the activation elicited within certain regions by some stimulus or task has, in part, given way to analysis of patterns of co-activation or functional connectivity between distal regions...
October 4, 2017: NeuroImage
https://www.readbyqxmd.com/read/28986564/dynamics-of-functional-connectivity-at-high-spatial-resolution-reveal-long-range-interactions-and-fine-scale-organization
#12
Maria Giulia Preti, Dimitri Van De Ville
Dynamic functional connectivity (dFC) derived from resting-state functional magnetic resonance imaging sheds light onto moment-to-moment reconfigurations of large-scale functional brain networks. Due to computational limits, connectivity is typically computed using pre-defined atlases, a non-trivial choice that might influence results. Here, we leverage new computational methods to retrieve dFC at the voxel level in terms of dominant patterns of fluctuations, and demonstrate that this new representation is informative to derive meaningful brain parcellations, capturing both long-range interactions and fine-scale local organization...
October 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28986208/dynamic-functional-connectivity-and-brain-metastability-during-altered-states-of-consciousness
#13
REVIEW
Federico Cavanna, Martina G Vilas, Matías Palmucci, Enzo Tagliazucchi
The scientific study of human consciousness has greatly benefited from the development of non-invasive brain imaging methods. The quest to identify the neural correlates of consciousness combined psychophysical experimentation with neuroimaging tools such as functional magnetic resonance imaging (fMRI) to map the changes in neural activity associated with conscious vs. unconscious percepts. Different neuroimaging methods have also been applied to characterize spontaneous brain activity fluctuations during altered states of consciousness, and to develop quantitative metrics for the level of consciousness...
October 3, 2017: NeuroImage
https://www.readbyqxmd.com/read/28986105/dynamic-functional-connectivity-analysis-reveals-improved-association-between-brain-networks-and-eating-behaviors-compared-to-static-analysis
#14
Bo-Yong Park, Taesup Moon, Hyunjin Park
Uncontrollable eating behavior is highly associated with dysfunction in neurocognitive systems. We aimed to quantitatively link brain networks and eating behaviors based on dynamic functional connectivity analysis, which reflects temporal dynamics of brain networks. We used 62 resting-state functional magnetic resonance imaging data sets representing 31 healthy weight (HW) and 31 non-HW participants based on body mass index (BMI). Brain networks were defined using a data-driven group-independent component analysis and a dynamic connectivity analysis with a sliding window technique was applied...
October 3, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28977574/the-effects-of-experimental-manipulation-of-sleep-duration-on-neural-response-to-food-cues
#15
Kathryn E Demos, Lawrence H Sweet, Chantelle N Hart, Jeanne M McCaffery, Samantha E Williams, Kimberly A Mailloux, Jennifer Trautvetter, Max M Owens, Rena R Wing
Despite growing literature on neural food cue responsivity in obesity, little is known about how the brain processes food cues following partial sleep deprivation and whether short sleep leads to changes similar to those observed in obesity. We used functional magnetic resonance imaging (fMRI) to test the hypothesis that short sleep leads to increased reward-related and decreased inhibitory control-related processing of food cues.In a within-subject design, 30 participants (22 female, mean age = 36.7 standard deviation = 10...
November 1, 2017: Sleep
https://www.readbyqxmd.com/read/28969437/dynamic-functional-connectivity-states-between-the-dorsal-and-ventral-sensorimotor-networks-revealed-by-dynamic-conditional-correlation-analysis-of-resting-state-functional-mri
#16
Maleeha Fatima Syed, Martin Lindquist, Jay J Pillai, Shruti Agarwal, Sachin K Gujar, Ann S Choe, Brian S Caffo, Haris I Sair
Functional connectivity in resting state functional Magnetic Resonance Imaging (rs-fMRI) has received substantial attention since the initial findings of Biswal et al. Traditional network correlation metrics assume that the functional connectivity in the brain remains stationary over time. However, recent studies have shown that robust temporal fluctuations of functional connectivity among as well as within functional networks exist, challenging this assumption. In this study, these dynamic correlation differences were investigated between the dorsal and ventral sensorimotor networks by applying the Dynamic Conditional Correlation (DCC) model to rs-fMRI data of 20 healthy subjects...
October 2, 2017: Brain Connectivity
https://www.readbyqxmd.com/read/28947263/dimensionality-reduction-impedes-the-extraction-of-dynamic-functional-connectivity-states-from-fmri-recordings-of-resting-wakefulness
#17
MohammadMehdi Kafashan, Ben Julian A Palanca, ShiNung Ching
BACKGROUND: Resting wakefulness is not a unitary state, with evidence accumulating that spontaneous reorganization of brain activity can be assayed through functional magnetic resonance imaging (fMRI). The dynamics of correlated fMRI signals among functionally-related brain regions, termed dynamic functional connectivity (dFC), may represent nonstationarity arising from underlying neural processes. However, given the dimensionality and noise inherent in such recordings, seeming fluctuations in dFC could be due to sampling variability or artifacts...
September 22, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28947009/a-multi-variate-blind-source-separation-algorithm
#18
M Goldhacker, P Keck, A Igel, E W Lang, A M Tomé
BACKGROUND AND OBJECTIVE: The study follows the proposal of decomposing a given data matrix into a product of independent spatial and temporal component matrices. A multi-variate decomposition approach is presented, based on an approximate diagonalization of a set of matrices computed using a latent space representation. METHODS: The proposed methodology follows an algebraic approach, which is common to space, temporal or spatiotemporal blind source separation algorithms...
November 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28942061/the-behavioral-and-cognitive-relevance-of-time-varying-dynamic-changes-in-functional-connectivity
#19
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 21, 2017: NeuroImage
https://www.readbyqxmd.com/read/28940859/dynamic-functional-connectivity-and-individual-differences-in-emotions-during-social-stress
#20
Michael J Tobia, Koby Hayashi, Grey Ballard, Ian H Gotlib, Christian E Waugh
Exposure to acute stress induces multiple emotional responses, each with their own unique temporal dynamics. Dynamic functional connectivity (dFC) measures the temporal variability of network synchrony and captures individual differences in network neurodynamics. This study investigated the relationship between dFC and individual differences in emotions induced by an acute psychosocial stressor. Sixteen healthy adult women underwent fMRI scanning during a social evaluative threat (SET) task, and retrospectively completed questionnaires that assessed individual differences in subjectively experienced positive and negative emotions about stress and stress relief during the task...
September 20, 2017: Human Brain Mapping
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