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Resting state functional connectivity

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https://www.readbyqxmd.com/read/28080965/feeling-learning-from-and-being-aware-of-inner-states-interoceptive-dimensions-in-neurodegeneration-and-stroke
#1
Indira García-Cordero, Lucas Sedeño, Laura de la Fuente, Andrea Slachevsky, Gonzalo Forno, Francisco Klein, Patricia Lillo, Jesica Ferrari, Clara Rodriguez, Julian Bustin, Teresa Torralva, Sandra Baez, Adrian Yoris, Sol Esteves, Margherita Melloni, Paula Salamone, David Huepe, Facundo Manes, Adolfo M García, Agustín Ibañez
Interoception is a complex process encompassing multiple dimensions, such as accuracy, learning and awareness. Here, we examined whether each of those dimensions relies on specialized neural regions distributed throughout the vast interoceptive network. To this end, we obtained relevant measures of cardiac interoception in healthy subjects and patients offering contrastive lesion models of neurodegeneration and focal brain damage: behavioural variant fronto-temporal dementia (bvFTD), Alzheimer's disease (AD) and fronto-insular stroke...
November 19, 2016: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28079189/maintenance-and-representation-of-mind-wandering-during-resting-state-fmri
#2
Ying-Hui Chou, Mark Sundman, Heather E Whitson, Pooja Gaur, Mei-Lan Chu, Carol P Weingarten, David J Madden, Lihong Wang, Imke Kirste, Marc Joliot, Michele T Diaz, Yi-Ju Li, Allen W Song, Nan-Kuei Chen
Major advances in resting-state functional magnetic resonance imaging (fMRI) techniques in the last two decades have provided a tool to better understand the functional organization of the brain both in health and illness. Despite such developments, characterizing regulation and cerebral representation of mind wandering, which occurs unavoidably during resting-state fMRI scans and may induce variability of the acquired data, remains a work in progress. Here, we demonstrate that a decrease or decoupling in functional connectivity involving the caudate nucleus, insula, medial prefrontal cortex and other domain-specific regions was associated with more sustained mind wandering in particular thought domains during resting-state fMRI...
January 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28077714/formation-of-long-term-locomotor-memories-is-associated-with-functional-connectivity-changes-in-the-cerebellar-thalamic-cortical-network
#3
Firas Mawase, Simona Bar-Haim, Lior Shmuelof
: Although motor adaptation is typically rapid, accumulating evidence shows that it is also associated with long-lasting behavioral and neuronal changes. Two processes were suggested to explain the formation of long-term motor memories: recall, reflecting a retrieval of previous motor actions, and faster relearning, reflecting an increased sensitivity to errors. Although these manifestations of motor memories were initially demonstrated in the context of adaptation experiments in reaching, indications of long-term motor memories were also demonstrated recently in other kinds of adaptation such as in locomotor adaptation...
January 11, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28074926/disrupted-global-metastability-and-static-and-dynamic-brain-connectivity-across-individuals-in-the-alzheimer-s-disease-continuum
#4
Aldo Córdova-Palomera, Tobias Kaufmann, Karin Persson, Dag Alnæs, Nhat Trung Doan, Torgeir Moberget, Martina Jonette Lund, Maria Lage Barca, Andreas Engvig, Anne Brækhus, Knut Engedal, Ole A Andreassen, Geir Selbæk, Lars T Westlye
As findings on the neuropathological and behavioral components of Alzheimer's disease (AD) continue to accrue, converging evidence suggests that macroscale brain functional disruptions may mediate their association. Recent developments on theoretical neuroscience indicate that instantaneous patterns of brain connectivity and metastability may be a key mechanism in neural communication underlying cognitive performance. However, the potential significance of these patterns across the AD spectrum remains virtually unexplored...
January 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28074492/confirmation-of-resting-state-bold-fluctuations-in-the-human-brainstem-and-spinal-cord-after-identification-and-removal-of-physiological-noise
#5
Shreyas Harita, Patrick W Stroman
PURPOSE: Resting-state functional MRI (rs-fMRI) has been used to investigate networks within the cortex, but its use in the brainstem (BS) and spinal cord (SC) has been limited. This region presents challenges for fMRI, partly because of sources of physiological noise. This study aims to quantify noise contributions to rs-fMRI, and to obtain evidence of resting-state blood oxygenation level-dependent (BOLD) fluctuations. METHODS: Resting-state-fMRI data were obtained from the BS/SC in 16 participants, at 3 Tesla, with T2 -weighted single-shot fast spin-echo imaging...
January 11, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28070912/role-of-testosterone-and-y-chromosome-genes-for-the-masculinization-of-the-human-brain
#6
Ivanka Savic, Louise Frisen, Amirhossein Manzouri, Anna Nordenstrom, Angelica Lindén Hirschberg
: Women with complete androgen insensitivity syndrome (CAIS) have a male (46,XY) karyotype but no functional androgen receptors. Their condition, therefore, offers a unique model for studying testosterone effects on cerebral sex dimorphism. We present MRI data from 16 women with CAIS and 32 male (46,XY) and 32 female (46,XX) controls. METHODS: FreeSurfer software was employed to measure cortical thickness and subcortical structural volumes. Axonal connections, indexed by fractional anisotropy, (FA) were measured with diffusion tensor imaging, and functional connectivity with resting state fMRI...
January 10, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28069925/cerebellar-tdcs-modulates-neural-circuits-during-semantic-prediction-a-combined-tdcs-fmri-study
#7
Anila M D'Mello, Peter E Turkeltaub, Catherine J Stoodley
: It has been proposed that the cerebellum acquires internal models of mental processes that enable prediction, allowing for the optimization of behavior. In language, semantic prediction speeds speech production and comprehension. Right cerebellar lobules VI and VII (including Crus I/II) are engaged during a variety of language processes and are functionally connected with cerebral cortical language networks. Further, right posterolateral cerebellar neuromodulation modifies behavior during predictive language processing...
January 9, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28069917/dopamine-modulates-the-functional-organization-of-the-orbitofrontal-cortex
#8
Thorsten Kahnt, Philippe N Tobler
: Neuromodulators such as dopamine can alter the intrinsic firing properties of neurons, and may thereby change the configuration of larger functional circuits. The primate orbitofrontal cortex (OFC) receives dopaminergic input from midbrain nuclei, but the role of dopamine in the OFC is still unclear. Here we tested the idea that dopaminergic activity changes the pattern of connectivity between the OFC and the rest of the brain, and thereby reconfigures functional networks in the OFC...
January 9, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28067865/weak-functional-connectivity-in-the-human-fetal-brain-prior-to-preterm-birth
#9
Moriah E Thomason, Dustin Scheinost, Janessa H Manning, Lauren E Grove, Jasmine Hect, Narcis Marshall, Edgar Hernandez-Andrade, Susan Berman, Athina Pappas, Lami Yeo, Sonia S Hassan, R Todd Constable, Laura R Ment, Roberto Romero
It has been suggested that neurological problems more frequent in those born preterm are expressed prior to birth, but owing to technical limitations, this has been difficult to test in humans. We applied novel fetal resting-state functional MRI to measure brain function in 32 human fetuses in utero and found that systems-level neural functional connectivity was diminished in fetuses that would subsequently be born preterm. Neural connectivity was reduced in a left-hemisphere pre-language region, and the degree to which connectivity of this left language region extended to right-hemisphere homologs was positively associated with the time elapsed between fMRI assessment and delivery...
January 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28067298/widespread-temporo-occipital-lobe-dysfunction-in-amyotrophic-lateral-sclerosis
#10
Kristian Loewe, Judith Machts, Jörn Kaufmann, Susanne Petri, Hans-Jochen Heinze, Christian Borgelt, Joseph Allen Harris, Stefan Vielhaber, Mircea Ariel Schoenfeld
Recent studies suggest that amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD) lie on a single clinical continuum. However, previous neuroimaging studies have found only limited involvement of temporal lobe regions in ALS. To better delineate possible temporal lobe involvement in ALS, the present study aimed to examine changes in functional connectivity across the whole brain, particularly with regard to extra-motor regions, in a group of 64 non-demented ALS patients and 38 healthy controls...
January 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28063366/white-matter-lesions-relate-to-tract-specific-reductions-in-functional-connectivity
#11
Carolyn D Langen, Hazel I Zonneveld, Tonya White, Wyke Huizinga, Lotte G M Cremers, Marius de Groot, Mohammad Arfan Ikram, Wiro J Niessen, Meike W Vernooij
White matter lesions play a role in cognitive decline and dementia. One presumed pathway is through disconnection of functional networks. Little is known about location-specific effects of lesions on functional connectivity. This study examined location-specific effects within anatomically-defined white matter tracts in 1584 participants of the Rotterdam Study, aged 50-95. Tracts were delineated from diffusion magnetic resonance images using probabilistic tractography. Lesions were segmented on fluid-attenuated inversion recovery images...
December 14, 2016: Neurobiology of Aging
https://www.readbyqxmd.com/read/28062908/role-of-altered-cerebello-thalamo-cortical-network-in-the-neurobiology-of-essential-tremor
#12
Abhishek Lenka, Ketaki Swapnil Bhalsing, Rajanikant Panda, Ketan Jhunjhunwala, Rajini M Naduthota, Jitender Saini, Rose Dawn Bharath, Ravi Yadav, Pramod Kumar Pal
INTRODUCTION: Essential tremor (ET) is the most common movement disorder among adults. Although ET has been recognized as a mono-symptomatic benign illness, reports of non-motor symptoms and non-tremor motor symptoms have increased its clinical heterogeneity. The neural correlates of ET are not clearly understood. The aim of this study was to understand the neurobiology of ET using resting state fMRI. METHODS: Resting state functional MR images of 30 patients with ET and 30 age- and gender-matched healthy controls were obtained...
January 6, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28059782/differential-hemispheric-predilection-of%C3%A2-microstructural-white-matter-and%C3%A2-functional-connectivity-abnormalities-between-respectively-semantic-and%C3%A2-behavioral-variant-frontotemporal-dementia
#13
Rozanna Meijboom, Rebecca M E Steketee, Leontine S Ham, Aad van der Lugt, John C van Swieten, Marion Smits
Semantic dementia (SD) and behavioral variant frontotemporal dementia (bvFTD), subtypes of frontotemporal dementia, are characterized by distinct clinical symptoms and neuroimaging features, with predominant left temporal grey matter (GM) atrophy in SD and bilateral or right frontal GM atrophy in bvFTD. Such differential hemispheric predilection may also be reflected by other neuroimaging features, such as brain connectivity. This study investigated white matter (WM) microstructure and functional connectivity differences between SD and bvFTD, focusing on the hemispheric predilection of these differences...
December 3, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28057931/the-oprm1-a118g-polymorphism-modulates-the-descending-pain-modulatory-system-for-individual-pain-experience-in-young-women-with-primary-dysmenorrhea
#14
Shyh-Yuh Wei, Li-Fen Chen, Ming-Wei Lin, Wei-Chi Li, Intan Low, Ching-Ju Yang, Hsiang-Tai Chao, Jen-Chuen Hsieh
The mu-opioid receptor (OPRM1) A118G polymorphism underpins different pain sensitivity and opioid-analgesic outcome with unclear effect on the descending pain modulatory system (DPMS). Primary dysmenorrhea (PDM), the most prevalent gynecological problem with clear painful and pain free conditions, serves as a good clinical model of spontaneous pain. The objective of this imaging genetics study was therefore to explore if differences in functional connectivity (FC) of the DPMS between the OPRM1 A118G polymorphisms could provide a possible explanation for the differences in pain experience...
January 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28057531/resting-state-brain-connectivity-patterns-before-eventual-relapse-into-cocaine-abuse
#15
M Berlingeri, D Losasso, A Girolo, E Cozzolino, T Masullo, M Scotto, M Sberna, G Bottini, E Paulesu
According to recent theories, drug addicted patients suffer of an impaired response inhibition and salience attribution (I-RISA) together with a perturbed connectivity between the nuclei accumbens (NAcs) and the orbito-prefrontal (oPFC) and dorsal prefrontal (dPFC) cortices, brain regions associated with motivation and cognitive control. To empirically test these assumptions, we evaluated the (neuro)psychological trait and the functional organization of the resting state brain networks associated with the NAcs in 18 former cocaine abusers (FCAs), while being in drug abstinence since 5 months...
January 2, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28057458/the-inferior-parietal-lobule-and-temporoparietal-junction-a-network-perspective
#16
Kajsa M Igelström, Michael S A Graziano
Information processing in specialized, spatially distributed brain networks underlies the diversity and complexity of our cognitive and behavioral repertoire. Networks converge at a small number of hubs - highly connected regions that are central for multimodal integration and higher-order cognition. We review one major network hub of the human brain: the inferior parietal lobule and the overlapping temporoparietal junction (IPL/TPJ). The IPL is greatly expanded in humans compared to other primates and matures late in human development, consistent with its importance in higher-order functions...
January 2, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28054651/alerted-default-mode-functional-connectivity-changes-in-the-aftermath-of-social-stress
#17
Benjamin Clemens, Lisa Wagels, Magdalena Bauchmüller, Rene Bergs, Ute Habel, Nils Kohn
Stress affects the brain at a network level: the salience network is supposedly upregulated, while at the same time the executive control network is downregulated. While theoretically described, the effects in the aftermath of stress have thus far not been tested empirically. Here, we compared for the first time resting-state functional connectivity in a large sample of healthy volunteers before and after a mild social stressor. Following the theoretical prediction, we focused on connectivity of the salience network (SN), the executive control network (ECN) and the default mode network (DMN)...
January 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28054126/longitudinal-multi-modal-neuroimaging-in-opsoclonus-myoclonus-syndrome
#18
Sun-Young Oh, Rainer Boegle, Peter Zu Eulenburg, Matthias Ertl, Ji-Soo Kim, Marianne Dieterich
To investigate structural, metabolic, and functional connectivity changes in visual and oculomotor structures in a patient with paraneoplastic opsoclonus-myoclonus syndrome, serial resting-state functional and structural MRI, and FDG-PET data were collected during the acute stage and later on when the opsoclonus had resolved. In the acute stage, an FDG-PET scan demonstrated a substantially increased metabolism in structures around the deep cerebellar nuclei [e.g., fastigial nucleus (FN)] and a relatively reduced metabolism in the bilateral occipital lobes which normalized over 12 months...
January 4, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28053037/left-anterior-temporal-lobe-and-bilateral-anterior-cingulate-cortex-are-semantic-hub-regions-evidence-from-behavior-nodal-degree-mapping-in-brain-damaged-patients
#19
Ying Zhao, Luping Song, Junhua Ding, Nan Lin, Qiang Wang, Xiaoxia Du, Rong Sun, Zaizhu Han
: The organizational principles of semantic memory in the human brain are still controversial. Although studies have shown that the semantic system contains hub regions that bind information from different sensorimotoric modalities to form concepts, it is unknown whether there are hub regions other than the anterior temporal lobe (ATL). Meanwhile, previous studies have rarely used network measurements to explore the hubs or correlated network indexes with semantic performance, although the most direct supportive evidence of hubs should come from the network perspective...
January 4, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28052456/frontoparietal-activation-during-visual-conjunction-search-effects-of-bottom-up-guidance-and-adult-age
#20
David J Madden, Emily L Parks, Catherine W Tallman, Maria A Boylan, David A Hoagey, Sally B Cocjin, Micah A Johnson, Ying-Hui Chou, Guy G Potter, Nan-Kuei Chen, Lauren E Packard, Rachel E Siciliano, Zachary A Monge, Michele T Diaz
We conducted functional magnetic resonance imaging (fMRI) with a visual search paradigm to test the hypothesis that aging is associated with increased frontoparietal involvement in both target detection and bottom-up attentional guidance (featural salience). Participants were 68 healthy adults, distributed continuously across 19 to 78 years of age. Frontoparietal regions of interest (ROIs) were defined from resting-state scans obtained prior to task-related fMRI. The search target was defined by a conjunction of color and orientation...
January 4, 2017: Human Brain Mapping
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