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https://www.readbyqxmd.com/read/28328939/multimodal-mr-imaging-reveals-large-scale-structural-and-functional-connectivity-changes-in-profound-early-blindness
#1
Corinna M Bauer, Gabriella V Hirsch, Lauren Zajac, Bang-Bon Koo, Olivier Collignon, Lotfi B Merabet
In the setting of profound ocular blindness, numerous lines of evidence demonstrate the existence of dramatic anatomical and functional changes within the brain. However, previous studies based on a variety of distinct measures have often provided inconsistent findings. To help reconcile this issue, we used a multimodal magnetic resonance (MR)-based imaging approach to provide complementary structural and functional information regarding this neuroplastic reorganization. This included gray matter structural morphometry, high angular resolution diffusion imaging (HARDI) of white matter connectivity and integrity, and resting state functional connectivity MRI (rsfcMRI) analysis...
2017: PloS One
https://www.readbyqxmd.com/read/28326934/activations-of-muscarinic-m1-receptors-in-the-anterior-cingulate-cortex-contribute-to-the-antinociceptive-effect-via-gabaergic-transmission
#2
Kohei Koga, Yu Matsuzaki, Kenji Honda, Fumihiro Eto, Tomonori Furukawa, Keisuke Migita, Keiichi Irie, Kenichi Mishima, Shinya Ueno
Background Cholinergic systems regulate the synaptic transmission resulting in the contribution of the nociceptive behaviors. Anterior cingulate cortex is a key cortical area to play roles in nociception and chronic pain. However, the effect of the activation of cholinergic system for nociception is still unknown in the cortical area. Here, we tested whether the activation of cholinergic receptors can regulate nociceptive behaviors in adult rat anterior cingulate cortex by integrative methods including behavior, immunohistochemical, and electrophysiological methods...
January 2017: Molecular Pain
https://www.readbyqxmd.com/read/28322427/the-neuronal-correlates-of-mirror-illusion-in-children-with-spastic-hemiparesis-a-study-with-functional-magnetic-resonance-imaging
#3
Christian Weisstanner, Stefanie Saxer, Roland Wiest, Alain Kaelin-Lang, Christopher J Newman, Maja Steinlin, Sebastian Grunt
AIM: To investigate the neuronal activation pattern underlying the effects of mirror illusion in children/adolescents with normal motor development and in children/adolescents with hemiparesis and preserved contralateral corticospinal organisation. METHOD: The type of cortical reorganisation was classified according to results of transcranial magnetic stimulation. Only subjects with congenital lesions and physiological contralateral cortical reorganisation were included...
March 21, 2017: Swiss Medical Weekly
https://www.readbyqxmd.com/read/28321973/cortical-and-subcortical-mechanisms-of-brain-machine-interfaces
#4
Silvia Marchesotti, Roberto Martuzzi, Aaron Schurger, Maria Laura Blefari, José R Del Millán, Hannes Bleuler, Olaf Blanke
Technical advances in the field of Brain-Machine Interfaces (BMIs) enable users to control a variety of external devices such as robotic arms, wheelchairs, virtual entities and communication systems through the decoding of brain signals in real time. Most BMI systems sample activity from restricted brain regions, typically the motor and premotor cortex, with limited spatial resolution. Despite the growing number of applications, the cortical and subcortical systems involved in BMI control are currently unknown at the whole-brain level...
March 21, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28320224/identification-of-common-neural-circuit-disruptions-in-cognitive-control-across-psychiatric-disorders
#5
Lisa M McTeague, Julia Huemer, David M Carreon, Ying Jiang, Simon B Eickhoff, Amit Etkin
OBJECTIVE: Cognitive deficits are a common feature of psychiatric disorders. The authors investigated the nature of disruptions in neural circuitry underlying cognitive control capacities across psychiatric disorders through a transdiagnostic neuroimaging meta-analysis. METHOD: A PubMed search was conducted for whole-brain functional neuroimaging articles published through June 2015 that compared activation in patients with axis I disorders and matched healthy control participants during cognitive control tasks...
March 21, 2017: American Journal of Psychiatry
https://www.readbyqxmd.com/read/28316456/functional-connectivity-of-the-pedunculopontine-nucleus-and-surrounding-region-in-parkinson-s-disease
#6
Ashwani Jha, Vladimir Litvak, Samu Taulu, Wesley Thevathasan, Jonathan A Hyam, Tom Foltynie, Patricia Limousin, Marko Bogdanovic, Ludvic Zrinzo, Alexander L Green, Tipu Z Aziz, Karl Friston, Peter Brown
Deep brain stimulation of the pedunculopontine nucleus and surrounding region (PPNR) is a novel treatment strategy for gait freezing in Parkinson's disease (PD). However, clinical results have been variable, in part because of the paucity of functional information that might help guide selection of the optimal surgical target. In this study, we use simultaneous magnetoencephalography and local field recordings from the PPNR in seven PD patients, to characterize functional connectivity with distant brain areas at rest...
January 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28290074/abnormal-brain-white-matter-network-in-young-smokers-a-graph-theory-analysis-study
#7
Yajuan Zhang, Min Li, Ruonan Wang, Yanzhi Bi, Yangding Li, Zhang Yi, Jixin Liu, Dahua Yu, Kai Yuan
Previous diffusion tensor imaging (DTI) studies had investigated the white matter (WM) integrity abnormalities in some specific fiber bundles in smokers. However, little is known about the changes in topological organization of WM structural network in young smokers. In current study, we acquired DTI datasets from 58 male young smokers and 51 matched nonsmokers and constructed the WM networks by the deterministic fiber tracking approach. Graph theoretical analysis was used to compare the topological parameters of WM network (global and nodal) and the inter-regional fractional anisotropy (FA) weighted WM connections between groups...
March 13, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28288855/alterations-in-prefrontal-connectivity-in-schizophrenia-assessed-using-diffusion-magnetic-resonance-imaging
#8
Vicente Molina, Alba Lubeiro, Oscar Soto, Margarita Rodriguez, Aldara Álvarez, Rebeca Hernández, Rodrigo de Luis-García
BACKGROUND: Spatial and biological characteristics of structural frontal disconnectivity in schizophrenia remain incompletely understood. Simultaneous streamline count (SC) and fractional anisotropy (FA) analyses may yield relevant complementary information to this end. METHODS: Using 3T diffusion magnetic resonance imaging both SC and FA were calculated for the tracts linking lateral and medial subregions of prefrontal cortex (PFC) to cingulate, hippocampus, caudate and thalamus in 27 schizophrenia patients (14 first-episodes) and 27 controls...
March 10, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28278267/potentiation-of-motor-sub-networks-for-motor-control-but-not-working-memory-interaction-of-dacc-and-sma-revealed-by-resting-state-directed-functional-connectivity
#9
Vaibhav A Diwadkar, Avisa Asemi, Ashley Burgess, Asadur Chowdury, Steven L Bressler
The dorsal Anterior Cingulate Cortex (dACC) and the Supplementary Motor Area (SMA) are known to interact during motor coordination behavior. We previously discovered that the directional influences underlying this interaction in a visuo-motor coordination task are asymmetric, with the dACC→SMA influence being significantly greater than that in the reverse direction. To assess the specificity of this effect, here we undertook an analysis of the interaction between dACC and SMA in two distinct contexts. In addition to the motor coordination task, we also assessed these effects during a (n-back) working memory task...
2017: PloS One
https://www.readbyqxmd.com/read/28276637/functional-changes-of-neural-circuits-in-stroke-patients-with-dysphagia-a-meta-analysis
#10
Lu Liu, Yuan Xiao, Wenjing Zhang, Li Yao, Xin Gao, Shah Chandan, Su Lui
AIM: Dysphagia is a common problem in stroke patients with unclear pathogenesis. Several recent functional Magnetic Resonance Imaging (fMRI) studies had been carried out to explore the cerebral functional changes in dysphagic stroke patients. The aim of this study was to analysis these imaging findings using a Meta-analysis. METHODS: We used Seed-based d Mapping (SDM) to conduct a meta-analysis for dysphagic stroke patients prior to any kind of special treatment for dysphagia...
February 3, 2017: Journal of Evidence-based Medicine
https://www.readbyqxmd.com/read/28275714/computational-architecture-of-the-parieto-frontal-network-underlying-cognitive-motor-control-in-monkeys
#11
Roberto Caminiti, Elena Borra, Federica Visco-Comandini, Alexandra Battaglia-Mayer, Bruno B Averbeck, Giuseppe Luppino
The statistical structure of intrinsic parietal and parieto-frontal connectivity in monkeys was studied through hierarchical cluster analysis. Based on their inputs, parietal and frontal areas were grouped into different clusters, including a variable number of areas that in most instances occupied contiguous architectonic fields. Connectivity tended to be stronger locally: that is, within areas of the same cluster. Distant frontal and parietal areas were targeted through connections that in most instances were reciprocal and often of different strength...
January 2017: ENeuro
https://www.readbyqxmd.com/read/28275544/polygenic-risk-for-five-psychiatric-disorders-and-cross-disorder-and-disorder-specific-neural-connectivity-in-two-independent-populations
#12
Tianqi Wang, Xiaolong Zhang, Ang Li, Meifang Zhu, Shu Liu, Wen Qin, Jin Li, Chunshui Yu, Tianzi Jiang, Bing Liu
Major psychiatric disorders, including attention deficit hyperactivity disorder (ADHD), autism (AUT), bipolar disorder (BD), major depressive disorder (MDD), and schizophrenia (SZ), are highly heritable and polygenic. Evidence suggests that these five disorders have both shared and distinct genetic risks and neural connectivity abnormalities. To measure aggregate genetic risks, the polygenic risk score (PGRS) was computed. Two independent general populations (N = 360 and N = 323) were separately examined to investigate whether the cross-disorder PGRS and PGRS for a specific disorder were associated with individual variability in functional connectivity...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28271290/arterial-spin-labelling-detects-posterior-cortical-hypoperfusion-in-non-demented-patients-with-parkinson-s-disease
#13
Zoe Joanna Syrimi, Lubomir Vojtisek, Ilona Eliasova, Jana Viskova, Alena Svatkova, Jiri Vanicek, Irena Rektorova
While previous studies suggested that perfusion abnormalities in Parkinson's disease (PD) are driven by dementia, our study aimed to identify perfusion underpinning of cognitive alteration in non-demented PD patients. Cerebral blood flow was measured using arterial spin labelling (ASL) in 28 PD patients (age 65 years ± 9.9 SD) and 16 age-matched healthy controls (HC) (age 65 years ± 7.8 SD), who also underwent neurological and cognitive testing. The 3D pseudocontinuous ASL and T2-weighted scans from 22 PD patients and 16 HC were analysed in a voxel-wise manner using SPM8 software...
March 7, 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/28263454/neuroplasticity-of-supraspinal-structures-associated-with-pathological-pain
#14
Pere Boadas-Vaello, Judit Homs, Francisco Reina, Anna Carrera, Enrique Verdú
Peripheral nerve and spinal cord injuries, along with other painful syndromes such as fibromyalgia, diabetic neuropathy, chemotherapeutic neuropathy, trigeminal neuralgia, complex regional pain syndrome, and/or irritable bowel syndrome, cause several neuroplasticity changes in the nervous system along its entire axis affecting the different neuronal nuclei. This paper reviews these changes, focusing on the supraspinal structures that are involved in the modulation and processing of pain, including the periaqueductal gray matter, red nucleus, locus coeruleus, rostral ventromedial medulla, thalamus, hypothalamus, basal ganglia, cerebellum, habenula, primary and secondary somatosensory cortex, motor cortex, mammillary bodies, hippocampus, septum, amygdala, cingulated and prefrontal cortex...
March 6, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28260681/the-effect-of-task-difficulty-on-motor-performance-and-frontal-striatal-connectivity-in-cocaine-users
#15
Daniel H Lench, William DeVries, Colleen A Hanlon
BACKGROUND: There is growing recognition that chronic cocaine users have alterations in sensorimotor control that are positively related to low frontal-striatal connectivity within the motor system. These frontal-striatal motor circuits however, are modulated by circuits governing attention, which are also disrupted in cocaine users. This study's aim was to determine if sensorimotor control deficits are positively related to the difficulty of a motor task or exist independent of the increasing cognitive demand...
January 21, 2017: Drug and Alcohol Dependence
https://www.readbyqxmd.com/read/28256689/-neuropsychology-of-tourette-s-disorder-cognition-neuroimaging-and-creativity
#16
R Espert, M Gadea, M Alino, J Oltra-Cucarella
INTRODUCTION: Tourette's disorder is the result of fronto-striatal brain dysfunction affecting people of all ages, with a debut in early childhood and continuing into adolescence and adulthood. DEVELOPMENT: This article reviews the main cognitive, functional neuroimaging and creativity-related studies in a disorder characterized by an excess of dopamine in the brain. CONCLUSIONS: Given the special cerebral configuration of these patients, neuropsychological alterations, especially in executive functions, should be expected...
February 24, 2017: Revista de Neurologia
https://www.readbyqxmd.com/read/28246517/longitudinal-intrinsic-brain-activity-changes-in-cirrhotic-patients-before-and-one-month-after-liver-transplantation
#17
Yue Cheng, Li-Xiang Huang, Li Zhang, Ming Ma, Shuang-Shuang Xie, Qian Ji, Xiao-Dong Zhang, Gao-Yan Zhang, Xue-Ning Zhang, Hong-Yan Ni, Wen Shen
OBJECTIVE: To evaluate the spontaneous brain activity alterations in liver transplantation (LT) recipients using resting-state functional MRI. MATERIALS AND METHODS: Twenty cirrhotic patients as transplant candidates and 25 healthy controls (HCs) were included in this study. All patients repeated the MRI study one month after LT. Amplitude of low-frequency fluctuation (ALFF) values were compared between cirrhotic patients (both pre- and post-LT) and HCs as well as between the pre- and post-LT groups...
March 2017: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/28245732/cortical-plasticity-after-brachial-plexus-injury-and-repair-a-resting-state-functional-mri-study
#18
Dhananjaya I Bhat, B Indira Devi, Komal Bharti, Rajanikant Panda
OBJECTIVE The authors aimed to understand the alterations of brain resting-state networks (RSNs) in patients with pan-brachial plexus injury (BPI) before and after surgery, which might provide insight into cortical plasticity after peripheral nerve injury and regeneration. METHODS Thirty-five patients with left pan-BPI before surgery, 30 patients after surgery, and 25 healthy controls underwent resting-state functional MRI (rs-fMRI). The 30 postoperative patients were subdivided into 2 groups: 14 patients with improvement in muscle power and 16 patients with no improvement in muscle power after surgery...
March 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28235422/crying-spells-triggered-by-thumb-index-rubbing-after-thalamic-stroke-a-case-report
#19
R Bassani, C Rosazza, L Ghirardin, V Caldiera, E Banco, C Casati, L Tesio
BACKGROUND: Pathologic crying, devoid of any emotional counterpart, is known to occur as a consequence of various brain stem, cortical hemispheric and cerebellar lesions or, quite exceptionally, of "dacrystic" epilepsy. The case reported here suggests that thalamic lesions may also cause crying spells, under the special circumstances described below. CASE PRESENTATION: After a mild left thalamic stroke a caucasian 77 years old man presented with crying spells with no emotional counterpart, triggered by thumb-index rubbing of his right hand...
February 24, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28228422/elevated-reward-response-to-receipt-of-palatable-food-predicts-future-weight-variability-in-healthy-weight-adolescents
#20
Samantha R Winter, Sonja Yokum, Eric Stice, Karol Osipowicz, Michael R Lowe
Background: Both an elevated brain-reward-region response to palatable food and elevated weight variability have been shown to predict future weight gain.Objective: We examined whether the brain-reward response to food is related to future weight variability.Design: A total of 162 healthy-weight adolescents, who were aged 14-18 y at baseline, were enrolled in the study and were assessed annually over a 3-y follow-up period with 127 participants completing the final 3-y follow-up assessment. With the use of functional magnetic resonance imaging, we tested whether the neural responses to a cue that signaled an impending milkshake receipt and the receipt of the milkshake predicted weight variability over the follow-up period...
February 22, 2017: American Journal of Clinical Nutrition
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