Academic literature on the topic 'Inter-hemispheric connectivity'

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Journal articles on the topic "Inter-hemispheric connectivity"

1

Bitan, T., A. Lifshits, Z. Breznitz, and J. R. Booth. "Inter-hemispheric connectivity during phonological processing." NeuroImage 47 (July 2009): S165. http://dx.doi.org/10.1016/s1053-8119(09)71756-2.

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Ribolsi, Michele, Francesco Mori, Valentina Magni, et al. "Impaired inter-hemispheric facilitatory connectivity in schizophrenia." Clinical Neurophysiology 122, no. 3 (2011): 512–17. http://dx.doi.org/10.1016/j.clinph.2010.08.013.

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Amodio, R., A. Prinster, A. M. Monteleone, et al. "Interhemispheric functional connectivity in anorexia and bulimia nervosa." European Psychiatry 41, S1 (2017): S551. http://dx.doi.org/10.1016/j.eurpsy.2017.01.781.

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IntroductionThe functional interplay between brain hemispheres is fundamental for behavioral, cognitive and emotional control. Several pathophysiological aspects of eating disorders (EDs) have been investigated by the use of functional Magnetic Resonance Imaging (fMRI).ObjectivesThe objective of the study was to investigate functional brain asymmetry of resting-state fMRI correlations in symptomatic patients with anorexia nervosa (AN) and bulimia nervosa (BN).AimsWe aimed at revealing whether brain regions implicated in reward, cognitive control, starvation and emotion regulation show altered inter-hemispheric functional connectivity in patients with AN and BN.MethodsUsing resting-state fMRI, voxel-mirrored homotopic connectivity (VMHC) and regional inter-hemispheric spectral coherence (IHSC) analyses in two canonical slow frequency bands (“Slow-5”, “Slow-4”) were studied in 15AN and 13BN patients and 16 healthy controls (HC). Using T1-weighted and diffusion tensor imaging MRI scans, regional VMHC values were correlated with the left-right asymmetry of corresponding homotopic gray matter volumes and with the white matter callosal fractional anisotropy (FA).ResultsCompared to HC, AN patients exhibited reduced VMHC in cerebellum, insula and precuneus, while BN patients showed reduced VMHC in dorso-lateral prefrontal and orbito-frontal cortices. The regional IHSC analysis highlighted that the inter-hemispheric functional connectivity was higher in the ‘Slow-5′Band in all regions except the insula. No group differences in left-right structural asymmetries and in VMHC vs callosal FA correlations were found.ConclusionsThese anomalies indicate that AN and BN, at least in their acute phase, are associated with a loss of inter-hemispheric connectivity in regions implicated in self-referential, cognitive control and reward processing.Disclosure of interestThe authors have not supplied their declaration of competing interest.
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Ovadia-Caro, Smadar, Yuval Nir, Andrea Soddu, et al. "Reduction in Inter-Hemispheric Connectivity in Disorders of Consciousness." PLoS ONE 7, no. 5 (2012): e37238. http://dx.doi.org/10.1371/journal.pone.0037238.

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Luo, ChunYan, XiaoYan Guo, Wei Song, et al. "Decreased Resting-State Interhemispheric Functional Connectivity in Parkinson’s Disease." BioMed Research International 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/692684.

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Background. Abnormalities in white matter integrity and specific functional network alterations have been increasingly reported in patients with Parkinson’s disease (PD). However, little is known about the inter-hemispheric interaction in PD.Methods. Fifty-one drug naive patients with PD and 51 age- and gender-matched healthy subjects underwent resting-state functional magnetic resonance imaging (rs-fMRI) scans. We compared the inter-hemispheric resting-state functional connectivity between patients with PD and healthy controls, using the voxel-mirrored homotopic connectivity (VMHC) approach. Then, we correlated the results from VMHC and clinical features in PD patients.Results. Relative to healthy subject, patients exhibited significantly lower VMHC in putamen and cortical regions associated with sensory processing and motor control (involving sensorimotor and supramarginal cortex), which have been verified to play a critical role in PD. In addition, there were inverse relationships between the UPDRS motor scores and VMHC in the sensorimotor, and between the illness duration and VMHC in the supramarginal gyrus in PD patients.Conclusions. Our results suggest that the functional coordination between homotopic brain regions is impaired in PD patients, extending previous notions about the disconnection of corticostriatal circuit by providing new evidence supporting a disturbance in inter-hemispheric connections in PD.
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Zhang, Yanan, Ni Liu, Zhenjia Wang, et al. "Impaired Inter-Hemispheric Functional Connectivity during Resting State in Female Patients with Migraine." Brain Sciences 12, no. 11 (2022): 1505. http://dx.doi.org/10.3390/brainsci12111505.

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The application of voxel-mirrored homotopic connectivity (VMHC) analysis to study the central mechanism of migraine has been limited. Furthermore, little is known about inter-hemispheric functional connectivity (FC) alterations during resting state in female patients with migraine. This study aimed to investigate potential interictal VMHC impairments in migraine without aura (MwoA) patients and the relationship between connectivity alterations and clinical parameters. Resting-state functional magnetic resonance imaging data and clinical information were acquired from 43 female MwoA patients and 43 matched healthy controls. VMHC analysis was used to compare differences between these two groups, and brain regions showing significant differences were chosen as a mask to perform a seed-based FC group comparison. Subsequent correlation analysis was conducted to explore the relationship between abnormal inter-hemispheric FC and clinical data. Compared with healthy controls, female MwoA patients revealed significantly decreased VMHC in the bilateral cerebellum; cuneus; and lingual, middle occipital, precentral and postcentral gyri. Seed-based FC analysis indicated disrupted intrinsic connectivity in the cerebellum, and default mode, visual and sensorimotor network. These VMHC and FC abnormalities were negatively correlated with clinical indexes including duration of disease, migraine days and visual analogue scale. These inter-hemispheric FC impairments and correlations between abnormal VMHC and FC and clinical scores may improve our understanding of the central mechanism of female-specific migraine.
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Korolev, Igor, Andrea Bozoki, Shantanu Majumdar, Kevin Berger, and David Zhu. "P4-104: Alzheimer's disease reduces inter-hemispheric hippocampal functional connectivity." Alzheimer's & Dementia 7 (July 2011): S739. http://dx.doi.org/10.1016/j.jalz.2011.05.2125.

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8

Pasquini, Luca, Kyung K. Peck, Alice Tao, et al. "Longitudinal Evaluation of Brain Plasticity in Low-Grade Gliomas: fMRI and Graph-Theory Provide Insights on Language Reorganization." Cancers 15, no. 3 (2023): 836. http://dx.doi.org/10.3390/cancers15030836.

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Language reorganization may represent an adaptive phenomenon to compensate tumor invasion of the dominant hemisphere. However, the functional changes over time underlying language plasticity remain unknown. We evaluated language function in patients with low-grade glioma (LGG), using task-based functional MRI (tb-fMRI), graph-theory and standardized language assessment. We hypothesized that functional networks obtained from tb-fMRI would show connectivity changes over time, with increased right-hemispheric participation. We recruited five right-handed patients (4M, mean age 47.6Y) with left-hemispheric LGG. Tb-fMRI and language assessment were conducted pre-operatively (pre-op), and post-operatively: post-op1 (4–8 months), post-op2 (10–14 months) and post-op3 (16–23 months). We computed the individual functional networks applying optimal percolation thresholding. Language dominance and hemispheric connectivity were quantified by laterality indices (LI) on fMRI maps and connectivity matrices. A fixed linear mixed model was used to assess the intra-patient correlation trend of LI values over time and their correlation with language performance. Individual networks showed increased inter-hemispheric and right-sided connectivity involving language areas homologues. Two patterns of language reorganization emerged: Three/five patients demonstrated a left-to-codominant shift from pre-op to post-op3 (type 1). Two/five patients started as atypical dominant at pre-op, and remained unchanged at post-op3 (type 2). LI obtained from tb-fMRI showed a significant left-to-right trend in all patients across timepoints. There were no significant changes in language performance over time. Type 1 language reorganization may be related to the treatment, while type 2 may be tumor-induced, since it was already present at pre-op. Increased inter-hemispheric and right-side connectivity may represent the initial step to develop functional plasticity.
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Wozniak, Jeffrey R., Bryon A. Mueller, Ryan L. Muetzel, et al. "Inter-Hemispheric Functional Connectivity Disruption in Children With Prenatal Alcohol Exposure." Alcoholism: Clinical and Experimental Research 35, no. 5 (2011): 849–61. http://dx.doi.org/10.1111/j.1530-0277.2010.01415.x.

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10

Hulshoff Pol, Hilleke E., Hugo G. Schnack, René C. W. Mandl, et al. "Focal white matter density changes in schizophrenia: reduced inter-hemispheric connectivity." NeuroImage 21, no. 1 (2004): 27–35. http://dx.doi.org/10.1016/j.neuroimage.2003.09.026.

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