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Brain Functional Connectivity Asymmetry: Left Hemisphere Is More Modular

Lucia Jajcay, David Tomeček, Jiří Horáček, Filip Španiel, Jaroslav Hlinka
2022 Symmetry  
Our results show that the left hemisphere is more modular.  ...  In this paper, we hypothesize that the structure of the left hemisphere is, on average, more modular.  ...  Due to the hemispheric asymmetries mentioned above, we hypothesize that the left hemisphere is more modular.  ... 
doi:10.3390/sym14040833 fatcat:wbm7kyu4xncqxojb664t77bjvq

Role of inter-hemispheric connections in functional brain networks [article]

J. H. Martínez, J. M. Buldú, D. Papo, F. De Vico Fallani, M. Chavez
2017 arXiv   pre-print
Our results show that the distribution of centrality strongly depends on the number of functional connections between hemispheres and the way these connections are distributed.  ...  Specifically, we consideredfunctional brain networks derived from high-density electroencephalographic (EEG) recordings and investigated how node centrality is shaped by interhemispheric connections.  ...  De Vico Fallani is supported by the French Agence Nationale de la Recherche (programme ANR-15-NEUC-0006-02).  ... 
arXiv:1710.11413v1 fatcat:oqu6xp3lu5g7fkm4rgkobo5i5i

Intrahemispheric cortico-cortical connections of the human auditory cortex

Leila Cammoun, Jean Philippe Thiran, Alessandra Griffa, Reto Meuli, Patric Hagmann, Stephanie Clarke
2014 Brain Structure and Function  
The modular architecture and hemispheric asymmetry in higher-order regions is compatible with segregated processing streams and lateralization of cognitive functions.  ...  Putative higher-order areas on the temporal and parietal convexities had more widely spread local connectivity and long-range connections with the prefrontal cortex; analysis of optimal community structure  ...  Hemispheric asymmetry of cortico-cortical connections.  ... 
doi:10.1007/s00429-014-0872-z pmid:25173473 fatcat:bnydmgok5bbp5l5o326y4l5ffq

Effects of Age on the Structure of Functional Connectivity Networks During Episodic and Working Memory Demand

Franziska Matthäus, Jan-Philip Schmidt, Anirban Banerjee, Thomas G. Schulze, Traute Demirakca, Carsten Diener
2012 Brain Connectivity  
In contrast, seniors showed pronounced left-hemispheric asymmetry with decreased connectivity within occipital areas, but increased connectivity within parietal areas.  ...  a more specific and localized activity in young subjects.  ...  Author Disclosure Statement The authors have no commercial associations that might create a conflict of interest in connection with this article.  ... 
doi:10.1089/brain.2012.0077 pmid:22698449 pmcid:PMC3621329 fatcat:icsengec35balfvzxxv6uor37q

Phenotypic Variability in Resting-State Functional Connectivity: Current Status

Chandan J. Vaidya, Evan M. Gordon
2013 Brain Connectivity  
Together, the reviewed evidence sets the stage for testing causal hypothesis about the functional role of intrinsic connectivity and augments its potential as a biomarker for healthy and disordered brain  ...  We reviewed the extant literature with the goal of assessing the extent to which resting-state functional connectivity is associated with phenotypic variability in healthy and disordered populations.  ...  in the left hemisphere.  ... 
doi:10.1089/brain.2012.0110 pmid:23294010 pmcid:PMC3634144 fatcat:kycgpre4orbgtdmhepuqtrveai

Functional connectivity and laterality of the motor and sensory components in the volitional swallowing network

Soren Y. Lowell, Richard C. Reynolds, Gang Chen, Barry Horwitz, Christy L. Ludlow
2012 Experimental Brain Research  
The greater connectivity from the left hemisphere insula to brain regions within and across hemispheres suggests that the insula is a primary integrative region for volitional swallowing in humans.  ...  Although unilateral brain lesions in either hemisphere can produce swallowing deficits, some functional neuroimaging studies indicate that the left hemisphere has greater activation in certain sensory  ...  target, using the following formula in which LL is the left seed, left hemisphere connectivity, LR is the left seed, right hemisphere connectivity, RL is the right seed, left hemispheres connectivity,  ... 
doi:10.1007/s00221-012-3069-9 pmid:22441258 pmcid:PMC3374850 fatcat:aypxa3yxbvh6lcotymyawunrve

Resting-State Networks and the Functional Connectome of the Human Brain in Agenesis of the Corpus Callosum

Julia P. Owen, Yi-Ou Li, Fanpei G. Yang, Charvi Shetty, Polina Bukshpun, Shivani Vora, Mari Wakahiro, Leighton B.N. Hinkley, Srikantan S. Nagarajan, Elliott H. Sherr, Pratik Mukherjee
2013 Brain Connectivity  
The corpus callosum is the largest white matter fiber bundle connecting the two cerebral hemispheres.  ...  Hence, the reduction or even complete absence of callosal connectivity does not affect the qualitative organization of bilateral resting-state networks or the modular organization of the functional connectome  ...  The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH. The authors would like to thank J.  ... 
doi:10.1089/brain.2013.0175 pmid:24063289 pmcid:PMC3868398 fatcat:4dmm7i4gande5g67gjry2v6gwe

Functional Connections in the Brain Transform Experience into Memory

Liza Gross
2006 PLoS Biology  
Summerfi eld C, Greene M, Wager T, Egner T, Hirsch J, et al. (2006) Neocortical connectivity during episodic memory formation.  ...  Regions of the dorsolateral prefrontal cortex found to exhibit signifi cant connectivity with face-sensitive (red) and place-sensitive (green) visual regions during the formation of new associations between  ...  It could be that the left hemisphere acquires more sophisticated math-related functions over time while the right remains relatively stable.  ... 
doi:10.1371/journal.pbio.0040165 pmid:20076573 pmcid:PMC1436032 fatcat:jehnwchsrfanznhgn6lqlsta6q

Inference of direct and multistep effective connectivities from functional connectivity of the brain and of relationships to cortical geometry

Grishma Mehta-Pandejee, P.A. Robinson, James A. Henderson, K.M. Aquino, Somwrita Sarkar
2017 Journal of Neuroscience Methods  
Highlights • Neural Field Theory (NFT) can yield effective connectivity from functional connectivity. • Effective and functional connectivity are related to cortical geometry. • Norm-minimization is a  ...  A c c e p t e d M a n u s c r i p t hemispheric connections to be estimated.  ...  left hemisphere; because aCM expt is symmetric, the transposed submatrix X T represents the connections 235 from left to right hemisphere.  ... 
doi:10.1016/j.jneumeth.2017.03.014 pmid:28342831 fatcat:whtoca2vv5d27cpxewlhhrwdv4

Function–structure associations of the brain: Evidence from multimodal connectivity and covariance studies

Jing Sui, Rene Huster, Qingbao Yu, Judith M. Segall, Vince D. Calhoun
2014 NeuroImage  
To examine the function-structure associations of the brain in a more comprehensive and integrated manner, we reviewed a number of multimodal studies that combined two or more functional (fMRI and/or EEG  ...  brain (e.g. development) or the diseased brain (e.g. mental illness) and, in the latter case, may provide a more sensitive measure than unimodal imaging for disease classification, e.g. multimodal biomarkers  ...  Patients with schizophrenia showed abnormal hemispheric asymmetry regarding their functional connectivity profiles of the ACC-cd with multiple brain areas, as for example increased negative connectivity  ... 
doi:10.1016/j.neuroimage.2013.09.044 pmid:24084066 pmcid:PMC3969780 fatcat:tngvfiyrdreyvmcg55qyqs6o6u

Reorganization of brain networks in aging: a review of functional connectivity studies

Roser Sala-Llonch, David Bartrés-Faz, Carme Junqué
2015 Frontiers in Psychology  
More recent approaches have focused on the study of functional connectivity, mainly derived from resting state fMRI, and have concluded that the higher levels of activity coexist with disrupted connectivity  ...  A common finding of the studies included is that older subjects present reduced functional connectivity compared to young adults.  ...  Furthermore, the different patterns of spatial localization of the compensation-related mechanisms leaded to the formulation of three main cognitive models: (1) The Hemispheric Asymmetry Reduction in Old  ... 
doi:10.3389/fpsyg.2015.00663 pmid:26052298 pmcid:PMC4439539 fatcat:bv2utufknbf2zffeq6klcbcbiu

White matter (dis)connections and gray matter (dys)functions in visual neglect: Gaining insights into the brain networks of spatial awareness

2008 Cortex  
Brain 1965;88:585-644), was extensively treated elsewhere (Bartolomeo P, Thiebaut de Schotten M, Doricchi F. Left unilateral neglect as a disconnection syndrome, Cerebral Cortex 2007;45:3127-48).  ...  We first summarise the structure of long-range white matter connections within the cerebral hemispheres and sketch a brief historical review of the original findings suggesting the role of intrahemispheric  ...  Mesulam (1981 Mesulam ( , 1999 Mesulam ( , 2002 proposed that neglect is more frequent after right brain damage because the right hemisphere controls attentional orienting in both the left and right hemispaces  ... 
doi:10.1016/j.cortex.2008.03.006 pmid:18603235 fatcat:tuj5i5hzkjhxvmbdu6e55lxqze

Altered Resting State Brain Dynamics in Temporal Lobe Epilepsy Can Be Observed in Spectral Power, Functional Connectivity and Graph Theory Metrics

Maher A. Quraan, Cornelia McCormick, Melanie Cohn, Taufik A. Valiante, Mary Pat McAndrews, Yu-Feng Zang
2013 PLoS ONE  
To our knowledge, this is the only study to encompass power, connectivity and graph theory metrics to investigate the reorganization of resting state functional networks in LTLE patients.  ...  Using EEG data from 15 controls and 9 left temporal lobe epilepsy (LTLE) patients, in this study we characterize how the dynamics of the healthy brain differ from the "dynamically balanced" state of the  ...  In this study we presented a characterization of brain dynamics accompanying the epileptic brain, encompassing brain activity, functional connectivity and network metrics in the hope of providing: 1) more  ... 
doi:10.1371/journal.pone.0068609 pmid:23922658 pmcid:PMC3724835 fatcat:fki7rrllzzhqpanjhzmwkxgsbm

A graph theory-based modeling of functional brain connectivity based on EEG: A systematic review in the context of neuroergonomics

Lina Ismail, Waldemar Karwowski
2020 IEEE Access  
Furthermore, the unweighted functional brain network has received substantially more attention in the literature than the weighted network.  ...  This review provides insight into the use of graph theory metrics to model functional brain connectivity in the context of neuroergonomics research.  ...  from the left and right hemispheres were demonstrated by a higher density, betweenness, and node degree for the left hemisphere. 9 [56] 19 EEG channels Synchroni zation likelihood Indirect  ... 
doi:10.1109/access.2020.3018995 fatcat:cbihabctmzbs3cdt7thxrma7bm

Hemispheric asymmetries in cerebral cortical networks

Jeffrey Hutsler, Ralf A.W. Galuske
2003 Trends in Neurosciences  
Asymmetries in functional information processing Perhaps the most cited hemispheric difference that might be related to the various microanatomical asymmetries is the better ability of the left hemisphere  ...  A history of area specialization Functional lateralization in the brain is, in essence, a more explicit version of regional specialization of mental processes within the cerebral cortex.  ... 
doi:10.1016/s0166-2236(03)00198-x pmid:12900174 fatcat:qo7ekxw3jraspdqf56vnaghu7m
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