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NeuroImage: Clinical

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https://www.readbyqxmd.com/read/27920978/network-interactions-underlying-mirror-feedback-in-stroke-a-dynamic-causal-modeling-study
#1
Soha Saleh, Mathew Yarossi, Thushini Manuweera, Sergei Adamovich, Eugene Tunik
Mirror visual feedback (MVF) is potentially a powerful tool to facilitate recovery of disordered movement and stimulate activation of under-active brain areas due to stroke. The neural mechanisms underlying MVF have therefore been a focus of recent inquiry. Although it is known that sensorimotor areas can be activated via mirror feedback, the network interactions driving this effect remain unknown. The aim of the current study was to fill this gap by using dynamic causal modeling to test the interactions between regions in the frontal and parietal lobes that may be important for modulating the activation of the ipsilesional motor cortex during mirror visual feedback of unaffected hand movement in stroke patients...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27920977/neurochemical-changes-in-patients-with-chronic-low-back-pain-detected-by-proton-magnetic-resonance-spectroscopy-a-systematic-review
#2
REVIEW
Xianjing Zhao, Maosheng Xu, Kristen Jorgenson, Jian Kong
BACKGROUND: Low back pain is a highly prevalent health problem around the world, affecting 50% to 85% of people at some point in life. The purpose of this systematic review is to summarize the previous proton magnetic resonance spectroscopy studies on brain chemical changes in patients with chronic low back pain (CLBP). METHODS: We identified relevant studies from a literature search of PubMed and EMBASE from 1980 to March 2016. Data extraction was performed on the subjects' characteristics, MRS methods, spectral analyses, cerebral metabolites and perceptual measurements...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27920976/resting-state-theta-band-connectivity-and-graph-analysis-in-generalized-social-anxiety-disorder
#3
Mengqi Xing, Reza Tadayonnejad, Annmarie MacNamara, Olusola Ajilore, Julia DiGangi, K Luan Phan, Alex Leow, Heide Klumpp
BACKGROUND: Functional magnetic resonance imaging (fMRI) resting-state studies show generalized social anxiety disorder (gSAD) is associated with disturbances in networks involved in emotion regulation, emotion processing, and perceptual functions, suggesting a network framework is integral to elucidating the pathophysiology of gSAD. However, fMRI does not measure the fast dynamic interconnections of functional networks. Therefore, we examined whole-brain functional connectomics with electroencephalogram (EEG) during resting-state...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27909683/fronto-striatal-glutamate-in-children-with-tourette-s-disorder-and-attention-deficit-hyperactivity-disorder
#4
Jilly Naaijen, Natalie J Forde, David J Lythgoe, Sophie E A Akkermans, Thaira J C Openneer, Andrea Dietrich, Marcel P Zwiers, Pieter J Hoekstra, Jan K Buitelaar
OBJECTIVE: Both Tourette's disorder (TD) and attention-deficit/hyperactivity disorder (ADHD) have been related to abnormalities in glutamatergic neurochemistry in the fronto-striatal circuitry. TD and ADHD often co-occur and the neural underpinnings of this co-occurrence have been insufficiently investigated in prior studies. METHOD: We used proton magnetic resonance spectroscopy (1H-MRS) in children between 8 and 12 years of age (TD n = 15, ADHD n = 39, TD + ADHD n = 29, and healthy controls n = 53) as an in vivo method of evaluating glutamate concentrations in the fronto-striatal circuit...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27896065/analysis-of-ageing-associated-grey-matter-volume-in-patients-with-multiple-sclerosis-shows-excess-atrophy-in-subcortical-regions
#5
Courtney A Bishop, Rexford D Newbould, Jean Sz Lee, Lesley Honeyfield, Rebecca Quest, Alessandro Colasanti, Rehiana Ali, Miriam Mattoscio, Antonio Cortese, Richard Nicholas, Paul M Matthews, Paolo A Muraro, Adam D Waldman
Age of onset in multiple sclerosis (MS) exerts an influence on the course of disease. This study examined whether global and regional brain volumes differed between "younger" and "older" onset MS subjects who were matched for short disease duration, mean 1.9 years and burden as measured by the MS Severity Score and relapses. 21 younger-onset MS subjects (age 30.4 ± 3.2 years) were compared with 17 older-onset (age 48.7 ± 3.3 years) as well as age-matched controls (n = 31, 31.9 ± 3.5 years and n = 21, 47...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27896064/executive-attention-networks-show-altered-relationship-with-default-mode-network-in-pd
#6
Peter Boord, Tara M Madhyastha, Mary K Askren, Thomas J Grabowski
Attention dysfunction is a common but often undiagnosed cognitive impairment in Parkinson's disease that significantly reduces quality of life. We sought to increase understanding of the mechanisms underlying attention dysfunction using functional neuroimaging. Functional MRI was acquired at two repeated sessions in the resting state and during the Attention Network Test, for 25 non-demented subjects with Parkinson's disease and 21 healthy controls. Behavioral and MRI contrasts were calculated for alerting, orienting, and executive control components of attention...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27882298/high-frequency-oscillations-and-high-frequency-functional-network-characteristics-in-the-intraoperative-electrocorticogram-in-epilepsy
#7
W J E M Zweiphenning, M A van 't Klooster, E van Diessen, N E C van Klink, G J M Huiskamp, T A Gebbink, F S S Leijten, P H Gosselaar, W M Otte, C J Stam, K P J Braun, G J M Zijlmans
OBJECTIVE: High frequency oscillations (HFOs; > 80 Hz), especially fast ripples (FRs, 250-500 Hz), are novel biomarkers for epileptogenic tissue. The pathophysiology suggests enhanced functional connectivity within FR generating tissue. Our aim was to determine the relation between brain areas showing FRs and 'baseline' functional connectivity within EEG networks, especially in the high frequency bands. METHODS: We marked FRs, ripples (80-250 Hz) and spikes in the electrocorticogram of 14 patients with refractory temporal lobe epilepsy...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27882297/disrupted-functional-connectivity-affects-resting-state-based-language-lateralization
#8
Alex Teghipco, Ali Hussain, Madalina E Tivarus
Pre-operative assessment of language localization and lateralization is critical to preserving brain function after lesion or epileptogenic tissue resection. Task fMRI (t-fMRI) has been extensively and reliably used to this end, but resting state fMRI (rs-fMRI) is emerging as an alternative pre-operative brain mapping method that is independent of a patient's ability to comply with a task. We sought to evaluate if language lateralization obtained from rs-fMRI can replace standard assessment using t-fMRI. In a group of 43 patients scheduled for pre-operative fMRI brain mapping and 17 healthy controls, we found that existing methods of determining rs-fMRI lateralization by considering interhemispheric and intrahemispheric functional connectivity are inadequate compared to t-fMRI when applied to the language network...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27882296/white-matter-abnormalities-at-a-regional-and-voxel-level-in-focal-and-generalized-epilepsy-a-systematic-review-and-meta-analysis
#9
Geertruida Slinger, Michel R T Sinke, Kees P J Braun, Willem M Otte
OBJECTIVE: Since the introduction of diffusion tensor imaging, white matter abnormalities in epilepsy have been studied extensively. However, the affected areas reported, the extent of abnormalities and the association with relevant clinical parameters are highly variable. We aimed to obtain a more consistent estimate of white matter abnormalities and their association with clinical parameters in different epilepsy types. METHODS: We systematically searched for differences in white matter fractional anisotropy and mean diffusivity, at regional and voxel level, between people with epilepsy and healthy controls...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27882295/neuroanatomical-correlates-of-childhood-apraxia-of-speech-a-connectomic-approach
#10
Simona Fiori, Andrea Guzzetta, Jhimli Mitra, Kerstin Pannek, Rosa Pasquariello, Paola Cipriani, Michela Tosetti, Giovanni Cioni, Stephen E Rose, Anna Chilosi
Childhood apraxia of speech (CAS) is a paediatric speech sound disorder in which precision and consistency of speech movements are impaired. Most children with idiopathic CAS have normal structural brain MRI. We hypothesize that children with CAS have altered structural connectivity in speech/language networks compared to controls and that these altered connections are related to functional speech/language measures. Whole brain probabilistic tractography, using constrained spherical deconvolution, was performed for connectome generation in 17 children with CAS and 10 age-matched controls...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27872811/failure-to-mobilize-cognitive-control-for-challenging-tasks-correlates-with-symptom-severity-in-schizophrenia
#11
Bengi Baran, F Işık Karahanoğlu, Yigal Agam, Leonidas Mantonakis, Dara S Manoach
Deficits in the adaptive, flexible control of behavior contribute to the clinical manifestations of schizophrenia. We used functional MRI and an antisaccade paradigm to examine the neural correlates of cognitive control deficits and their relations to symptom severity. Thirty-three chronic medicated outpatients with schizophrenia and 31 healthy controls performed an antisaccade paradigm. We examined differences in recruitment of the cognitive control network and task performance for Hard (high control) versus Easy (low control) antisaccade trials within and between groups...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27872810/the-association-between-intra-and-juxta-cortical-pathology-and-cognitive-impairment-in-multiple-sclerosis-by-quantitative-t2-mapping-at-7%C3%A2-t-mri
#12
Céline Louapre, Sindhuja T Govindarajan, Costanza Giannì, Nancy Madigan, A Scott Nielsen, Jacob A Sloane, Revere P Kinkel, Caterina Mainero
Using quantitative T2* at 7 Tesla (T) magnetic resonance imaging, we investigated whether impairment in selective cognitive functions in multiple sclerosis (MS) can be explained by pathology in specific areas and/or layers of the cortex. Thirty-one MS patients underwent neuropsychological evaluation, acquisition of 7 T multi-echo T2* gradient-echo sequences, and 3 T anatomical images for cortical surfaces reconstruction. Seventeen age-matched healthy subjects served as controls. Cortical T2* maps were sampled at various depths throughout the cortex and juxtacortex...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27872809/abnormal-visuomotor-processing-in-schizophrenia
#13
Siân E Robson, Matthew J Brookes, Emma L Hall, Lena Palaniyappan, Jyothika Kumar, Michael Skelton, Nikolaos G Christodoulou, Ayaz Qureshi, Fiesal Jan, Mohammad Z Katshu, Elizabeth B Liddle, Peter F Liddle, Peter G Morris
Subtle disturbances of visual and motor function are known features of schizophrenia and can greatly impact quality of life; however, few studies investigate these abnormalities using simple visuomotor stimuli. In healthy people, electrophysiological data show that beta band oscillations in sensorimotor cortex decrease during movement execution (event-related beta desynchronisation (ERBD)), then increase above baseline for a short time after the movement (post-movement beta rebound (PMBR)); whilst in visual cortex, gamma oscillations are increased throughout stimulus presentation...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27872808/delineation-of-cortical-pathology-in-multiple-sclerosis-using-multi-surface-magnetization-transfer-ratio-imaging
#14
David A Rudko, Mishkin Derakhshan, Josefina Maranzano, Kunio Nakamura, Douglas L Arnold, Sridar Narayanan
The purpose of our study was to evaluate the utility of measurements of cortical surface magnetization transfer ratio (csMTR) on the inner, mid and outer cortical boundaries as clinically accessible biomarkers of cortical gray matter pathology in multiple sclerosis (MS). Twenty-five MS patients and 12 matched controls were recruited from the MS Clinic of the Montreal Neurological Institute. Anatomical and magnetization transfer ratio (MTR) images were acquired using 3 Tesla MRI at baseline and two-year time-points...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27872807/identification-of-the-stria-medullaris-thalami-using-diffusion-tensor-imaging
#15
Ryan B Kochanski, Robert Dawe, Daniel B Eddelman, Mehmet Kocak, Sepehr Sani
BACKGROUND: Deep brain stimulation (DBS) via anatomical targeting of white matter tracts defined by diffusion tensor imaging (DTI) may be a useful tool in the treatment of pathologic neurophysiologic circuits implicated in certain disease states like treatment resistant depression (TRD). We sought to determine if DTI could be used to define the stria medullaris thalami (SM), the major afferent white matter pathway to the lateral habenula (LHb), a thalamic nucleus implicated in the pathophysiology of TRD...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27857886/effects-of-outcome-on-the-covariance-between-risk-level-and-brain-activity-in-adolescents-with-internet-gaming-disorder
#16
Xin Qi, Yongxin Yang, Shouping Dai, Peihong Gao, Xin Du, Yang Zhang, Guijin Du, Xiaodong Li, Quan Zhang
Individuals with internet gaming disorder (IGD) often have impaired risky decision-making abilities, and IGD-related functional changes have been observed during neuroimaging studies of decision-making tasks. However, it is still unclear how feedback (outcomes of decision-making) affects the subsequent risky decision-making in individuals with IGD. In this study, twenty-four adolescents with IGD and 24 healthy controls (HCs) were recruited and underwent functional magnetic resonance imaging while performing the balloon analog risk task (BART) to evaluate the effects of prior outcomes on brain activity during subsequent risky decision-making in adolescents with IGD...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27857885/the-polygenic-risk-for-bipolar-disorder-influences-brain-regional-function-relating-to-visual-and-default-state-processing-of-emotional-information
#17
Danai Dima, Simone de Jong, Gerome Breen, Sophia Frangou
Genome-wise association studies have identified a number of common single-nucleotide polymorphisms (SNPs), each of small effect, associated with risk to bipolar disorder (BD). Several risk-conferring SNPs have been individually shown to influence regional brain activation thus linking genetic risk for BD to altered brain function. The current study examined whether the polygenic risk score method, which models the cumulative load of all known risk-conferring SNPs, may be useful in the identification of brain regions whose function may be related to the polygenic architecture of BD...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27843765/t2-relaxometry-predicts-outcome-of-dbs-in-idiopathic-parkinson-s-disease
#18
Tarja Lönnfors-Weitzel, Thilo Weitzel, Johannes Slotboom, Claus Kiefer, Claudio Pollo, Michael Schüpbach, Markus Oertel, Alain Kaelin, Roland Wiest
INTRODUCTION: Deep brain stimulation (DBS) nowadays is a well-established treatment of motor symptoms in Parkinson's disease. The subthalamic nucleus (STN) is a common target for DBS, because motor improvements have been shown to be superior to best medical therapy, if DBS electrodes have been appropriately positioned. DBS target identification can be assisted by MRI beyond structural imaging by spatially resolved measurement of T2-relaxation times (T2r). AIM: We pose the question, whether T2r of the STN is linked to the severity of the disease and whether outcome of DBS may be correlated to an asymmetric manifestation of the disease...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27830115/reliability-of-measuring-regional-callosal-atrophy-in-neurodegenerative-diseases
#19
Jeroen Van Schependom, Saurabh Jain, Melissa Cambron, Anne-Marie Vanbinst, Johan De Mey, Dirk Smeets, Guy Nagels
The Corpus Callosum (CC) is an important structure connecting the two brain hemispheres. As several neurodegenerative diseases are known to alter its shape, it is an interesting structure to assess as biomarker. Yet, currently, the CC-segmentation is often performed manually and is consequently an error prone and time-demanding procedure. In this paper, we present an accurate and automated method for corpus callosum segmentation based on T1-weighted MRI images. After the initial construction of a CC atlas based on healthy controls, a new image is subjected to a mid-sagittal plane (MSP) detection algorithm and a 3D affine registration in order to initialise the CC within the extracted MSP...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27830114/disruptions-in-cortico-subcortical-covariance-networks-associated-with-anxiety-in-new-onset-childhood-epilepsy
#20
Camille Garcia-Ramos, Jack J Lin, Leonardo Bonilha, Jana E Jones, Daren C Jackson, Vivek Prabhakaran, Bruce P Hermann
Anxiety disorders represent a prevalent psychiatric comorbidity in both adults and children with epilepsy for which the etiology remains controversial. Neurobiological contributions have been suggested, but only limited evidence suggests abnormal brain volumes particularly in children with epilepsy and anxiety. Since the brain develops in an organized fashion, covariance analyses between different brain regions can be investigated as a network and analyzed using graph theory methods. We examined 46 healthy children (HC) and youth with recent onset idiopathic epilepsies with (n = 24) and without (n = 62) anxiety disorders...
2016: NeuroImage: Clinical
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