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https://www.readbyqxmd.com/read/28715661/cognitive-decline-and-brain-amyloid-%C3%AE-accumulation-across-3-years-in-adults-with-down-syndrome
#1
Sigan L Hartley, Benjamin L Handen, Darlynne Devenny, Iulia Mihaila, Regina Hardison, Patrick J Lao, William E Klunk, Peter Bulova, Sterling C Johnson, Bradley T Christian
Adults with Down syndrome (DS) have a high incidence of Alzheimer's disease (AD), providing a unique opportunity to explore the early, preclinical stages of AD neuropathology. We examined change in brain amyloid-β accumulation via the positron emission tomography tracer [11C] Pittsburgh compound B (PiB) across 2 data collection cycles, spaced 3 years apart, and decline in cognitive functioning in 58 adults with DS without clinical AD. PiB retention increased in the anterior cingulate gyrus, precuneus cortex, parietal cortex, and anterior ventral striatum...
June 2, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28707568/effects-of-transcranial-direct-current-stimulation-on-neural-network-structure-in-young-and-older-adults
#2
Andrew Martin, Marcus Meinzer, Robert Lindenberg, Mira M Sieg, Laura Nachtigall, Agnes Flöel
Transcranial direct current stimulation (tDCS) may be a viable tool to improve motor and cognitive function in advanced age. However, although a number of studies have demonstrated improved cognitive performance in older adults, other studies have failed to show restorative effects. The neural effects of beneficial stimulation response in both age groups is lacking. In the current study, tDCS was administered during simultaneous fMRI in 42 healthy young and older participants. Semantic word generation and motor speech baseline tasks were used to investigate behavioral and neural effects of uni- and bihemispheric motor cortex tDCS in a three-way, crossover, sham tDCS controlled design...
July 14, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28705227/sensorimotor-learning-neurocognitive-mechanisms-and-individual-differences
#3
REVIEW
R D Seidler, R G Carson
Here we provide an overview of findings and viewpoints on the mechanisms of sensorimotor learning presented at the 2016 Biomechanics and Neural Control of Movement (BANCOM) conference in Deer Creek, OH. This field has shown substantial growth in the past couple of decades. For example it is now well accepted that neural systems outside of primary motor pathways play a role in learning. Frontoparietal and anterior cingulate networks contribute to sensorimotor adaptation, reflecting strategic aspects of exploration and learning...
July 13, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28704833/pica-in-a-child-with-anterior-cingulate-gyrus-oligodendroglioma-case-report
#4
Shivani D Rangwala, Matthew K Tobin, Daniel M Birk, Jonathan T Butts, Dimitrios C Nikas, Yoon S Hahn
The anterior cingulate gyrus (ACG) is a continued focus of research as its exact role in brain function and vast connections with other anatomical locations is not fully understood. A review of the literature illustrates the role the ACG likely plays in cognitive and emotional processing, as well as a modulating role in motor function and goal-oriented behaviors. While lesions of the cingulate gyrus are rare, each new case broadens our understanding of its role in cognitive neuroscience and higher order processing...
July 14, 2017: Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28703919/cingulate-and-cerebellar-beta-oscillations-are-engaged-in-the-acquisition-of-auditory-motor-sequences
#5
María Herrojo Ruiz, Burkhard Maess, Eckart Altenmüller, Gabriel Curio, Vadim V Nikulin
Singing, music performance, and speech rely on the retrieval of complex sounds, which are generated by the corresponding actions and are organized into sequences. It is crucial in these forms of behavior that the serial organization (i.e., order) of both the actions and associated sounds be monitored and learned. To investigate the neural processes involved in the monitoring of serial order during the initial learning of sensorimotor sequences, we performed magnetoencephalographic recordings while participants explicitly learned short piano sequences under the effect of occasional alterations of auditory feedback (AAF)...
July 13, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28702352/automatized-smoking-related-action-schemata-are-reflected-by-reduced-fmri-activity-in-sensorimotor-brain-regions-of-smokers
#6
Ayse Ilkay Isik, Marcus J Naumer, Jochen Kaiser, Christian Buschenlange, Sandro Wiesmann, Stefan Czoschke, Yavor Yalachkov
In the later stages of addiction, automatized processes play a prominent role in guiding drug-seeking and drug-taking behavior. However, little is known about the neural correlates of automatized drug-taking skills and drug-related action knowledge in humans. We employed functional magnetic resonance imaging (fMRI) while smokers and non-smokers performed an orientation affordance task, where compatibility between the hand used for a behavioral response and the spatial orientation of a priming stimulus leads to shorter reaction times resulting from activation of the corresponding motor representations...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28701822/the-difference-of-neural-networks-between-bimanual-antiphase-and-in-phase-upper-limb-movements-a-preliminary-functional-magnetic-resonance-imaging-study
#7
Qiang Lin, Hai Li, Yu-Rong Mao, Wai-Leung Lo, Jiang-Li Zhao, Ling Chen, Yan Leng, Dong-Feng Huang, Le Li
Most daily movements require some degree of collaboration between the upper limbs. The neural mechanisms are bimanual-condition specific and therefore should be different between different activities. In this study, we aimed to explore intraregional activation and interregional connectivity during bimanual movement by functional magnetic resonance imaging (fMRI). Ten right-handed, normal subjects were recruited. The neural correlates of unimanual (right side) and bimanual (in-phase and antiphase) upper limb movements were investigated...
2017: Behavioural Neurology
https://www.readbyqxmd.com/read/28687313/two-different-mirror-neuron-networks-the-sensorimotor-hand-and-limbic-face-pathways
#8
REVIEW
P F Ferrari, M Gerbella, G Coudé, S Rozzi
The vast majority of functional studies investigating mirror neurons (MNs) explored their properties in relation to hand actions, and very few investigated how MNs respond to mouth actions or communicative gestures. Since hand and mouth MNs were recorded in two partially overlapping sectors of the ventral precentral cortex of the macaque monkey, there is a general assumption that they share a same neuroanatomical network, with the parietal cortex as a main source of visual information. In the current review, we challenge this perspective and describe the connectivity pattern of mouth MNs sector...
July 4, 2017: Neuroscience
https://www.readbyqxmd.com/read/28687229/the-phosphodiesterase-10a-selective-inhibitor-tak-063-induces-c-fos-expression-in-both-direct-and-indirect-pathway-medium-spiny-neurons-and-sub-regions-of-the-medial-prefrontal-cortex-in-rats
#9
Atsushi Nakatani, Sayuri Nakamura, Haruhide Kimura
TAK-063, a selective phosphodiesterase 10A (PDE10A) inhibitor, produces potent antipsychotic-like and pro-cognitive effects in rodents via balanced activation of striatal direct and indirect pathway medium spiny neurons (MSNs). Brain activity modulation by TAK-063 has been characterized using pharmacological magnetic resonance imaging and electroencephalography in animals, revealing modulation of activity in the prefrontal cortex (PFC) where there is little or no PDE10A expression. To understand the specific brain regions and cells affected by TAK-063 in rats, we assessed neural activation in the striatal complex and PFC using immunofluorescence staining to measure c-Fos expression...
July 4, 2017: Neuroscience Research
https://www.readbyqxmd.com/read/28686990/left-frontal-pole-theta-burst-stimulation-decreases-orbitofrontal-and-insula-activity-in-cocaine-users-and-alcohol-users
#10
Colleen A Hanlon, Logan T Dowdle, Brittany Correia, Oliver Mithoefer, Tonisha Kearney-Ramos, Daniel Lench, Millie Griffin, Raymond F Anton, Mark S George
BACKGROUND: Preclinical research has demonstrated a causal relationship between medial prefrontal cortex activity and cocaine self-administration. As a step towards translating those data to a neural circuit-based intervention for patients, this study sought to determine if continuous theta burst stimulation (cTBS) to the left frontal pole (FP), would attenuate frontal-striatal activity in two substance-dependent populations. METHODS: Forty-nine substance dependent individuals (25 cocaine, 24 alcohol) completed a single-blind, sham-controlled, crossover study wherein they received 6 trains of real or sham cTBS (110% resting motor threshold, FP1) each visit...
May 30, 2017: Drug and Alcohol Dependence
https://www.readbyqxmd.com/read/28675473/localization-of-orofacial-representation-in-the-corona-radiata-internal-capsule-and-cerebral-peduncle-in-macaca-mulatta
#11
R J Morecraft, A Binneboese, K S Stilwell-Morecraft, J Ge
Subcortical white matter injury is often accompanied by orofacial motor dysfunction, but little is known about the structural substrates accounting for these common neurological deficits. We studied the trajectory of the corticobulbar projection from the orofacial region of the primary (M1), ventrolateral (LPMCv), supplementary (M2), rostral cingulate (M3) and caudal cingulate (M4) motor regions through the corona radiata (CR), internal capsule (IC) and crus cerebri of the cerebral peduncle (ccCP). In the CR each pathway was segregated...
July 4, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28674492/aberrant-intrinsic-activity-and-connectivity-in-cognitively-normal-parkinson-s-disease
#12
Deborah L Harrington, Qian Shen, Gabriel N Castillo, J Vincent Filoteo, Irene Litvan, Colleen Takahashi, Chelsea French
Disturbances in intrinsic activity during resting-state functional MRI (rsfMRI) are common in Parkinson's disease (PD), but have largely been studied in a priori defined subnetworks. The cognitive significance of abnormal intrinsic activity is also poorly understood, as are abnormalities that precede the onset of mild cognitive impairment. To address these limitations, we leveraged three different analytic approaches to identify disturbances in rsfMRI metrics in 31 cognitively normal PD patients (PD-CN) and 30 healthy adults...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28672395/association-between-motor-symptoms-and-brain-metabolism-in-early-huntington-disease
#13
Véronique Gaura, Sonia Lavisse, Pierre Payoux, Serge Goldman, Christophe Verny, Pierre Krystkowiak, Philippe Damier, Frédéric Supiot, Anne-Catherine Bachoud-Levi, Philippe Remy
Importance: Brain hypometabolism is associated with the clinical consequences of the degenerative process, but little is known about regional hypermetabolism, sometimes observed in the brain of patients with clinically manifest Huntington disease (HD). Studying the role of regional hypermetabolism is needed to better understand its interaction with the motor symptoms of the disease. Objective: To investigate the association between brain hypometabolism and hypermetabolism with motor scores of patients with early HD...
July 3, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/28668411/functional-and-structural-changes-in-gray-matter-of-parkinson-s-disease-patients-with-mild-cognitive-impairment
#14
Boyu Chen, Shanshan Wang, Wenge Sun, Xiuli Shang, Hu Liu, Guohao Liu, Jie Gao, Guoguang Fan
BACKGROUND AND PURPOSE: Cognitive impairment is a common non-motor complication of Parkinson's disease (PD). To investigate cognitive-related changes of gray matter (GM) structure and function in PD using voxel-based morphometry (VBM) and resting state functional connectivity (RSFC). MATERIALS AND METHODS: Resting state functional magnetic resonance imaging (rs-fMRI) and 3D-T1-weighted MRI scans were obtained from 21 PD patients with mild cognitive impairment (PD-MCI), 11 PD patients with normal cognitive function (PD-NC), and 21 healthy controls (HC)...
August 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28667892/normal-aging-and-parkinson-s-disease-are-associated-with-the-functional-decline-of-distinct-frontal-striatal-circuits
#15
Aleksandra Gruszka, Adam Hampshire, Roger A Barker, Adrian M Owen
Impaired ability to shift attention between stimuli (i.e. shifting attentional 'set') is a well-established part of the dysexecutive syndrome in Parkinson's Disease (PD), nevertheless cognitive and neural bases of this deficit remain unclear. In this study, an fMRI-optimised variant of a classic paradigm for assessing attentional control (Hampshire and Owen 2006) was used to contrast activity in dissociable executive circuits in early-stage PD patients and controls. The results demonstrated that the neural basis of the executive performance impairments in PD is accompanied by hypoactivation within the striatum, anterior cingulate cortex (vACC), and inferior frontal sulcus (IFS) regions...
June 3, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28659421/slowing-gait-and-risk-for-cognitive-impairment-the-hippocampus-as-a-shared-neural-substrate
#16
Andrea L Rosso, Joe Verghese, Andrea L Metti, Robert M Boudreau, Howard J Aizenstein, Stephen Kritchevsky, Tamara Harris, Kristine Yaffe, Suzanne Satterfield, Stephanie Studenski, Caterina Rosano
OBJECTIVE: To identify the shared neuroimaging signature of gait slowing and cognitive impairment. METHODS: We assessed a cohort of older adults (n = 175, mean age 73 years, 57% female, 65% white) with repeated measures of gait speed over 14 years, MRI for gray matter volume (GMV) at year 10 or 11, and adjudicated cognitive status at year 14. Gait slowing was calculated by bayesian slopes corrected for intercepts, with higher values indicating faster decline. GMV was normalized to intracranial volume, with lower values indicating greater atrophy for 10 regions of interest (hippocampus, anterior and posterior cingulate, primary and supplementary motor cortices, posterior parietal lobe, middle frontal lobe, caudate, putamen, pallidum)...
June 28, 2017: Neurology
https://www.readbyqxmd.com/read/28654115/evidence-for-widespread-severe-brain-copper-deficiency-in-alzheimer-s-dementia
#17
Jingshu Xu, Stephanie J Church, Stefano Patassini, Paul Begley, Henry J Waldvogel, Maurice A Curtis, Richard L M Faull, Richard D Unwin, Garth J S Cooper
Datasets comprising simultaneous measurements of many essential metals in Alzheimer's disease (AD) brain are sparse, and available studies are not entirely in agreement. To further elucidate this matter, we employed inductively-coupled-plasma mass spectrometry to measure post-mortem levels of 8 essential metals and selenium, in 7 brain regions from 9 cases with AD (neuropathological severity Braak IV-VI), and 13 controls who had normal ante-mortem mental function and no evidence of brain disease. Of the regions studied, three undergo severe neuronal damage in AD (hippocampus, entorhinal cortex and middle-temporal gyrus); three are less-severely affected (sensory cortex, motor cortex and cingulate gyrus); and one (cerebellum) is relatively spared...
June 27, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28652971/loss-of-integrity-and-atrophy-in-cingulate-structural-covariance-networks-in-parkinson-s-disease
#18
Laura J de Schipper, Jeroen van der Grond, Johan Marinus, Johanna M L Henselmans, Jacobus J van Hilten
BACKGROUND: In Parkinson's disease (PD), the relation between cortical brain atrophy on MRI and clinical progression is not straightforward. Determination of changes in structural covariance networks - patterns of covariance in grey matter density - has shown to be a valuable technique to detect subtle grey matter variations. We evaluated how structural network integrity in PD is related to clinical data. METHODS: 3 Tesla MRI was performed in 159 PD patients. We used nine standardized structural covariance networks identified in 370 healthy subjects as a template in the analysis of the PD data...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28650517/adaptive-change-in-chewing-related-brain-activity-while-wearing-a-palatal-plate-an-fmri-study
#19
Yuka Inamochi, Kenji Fueki, Nobuo Usui, Masato Taira, Noriyuki Wakabayashi
Prosthodontic treatment success depends on patients' ability to adapt to an altered oral environment containing removable prostheses. We investigated adaptive chewing-related brain activity changes in response to a new oral environment. Twenty-eight fully dentate subjects (mean age: 28.6 years) wore experimental denture-base palatal plates (3-mm thick), for 7 days. We measured food mixing ability and cycle time, and assessed brain activity by functional magnetic resonance imaging during chewing at pre-insertion (Day 0), and immediately (Day 1), 3 days (Day 3), and 7 days (Day 7) after insertion...
June 26, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28647831/alterations-in-regional-homogeneity-of-resting-state-brain-activity-in-fatigue-of-parkinson-s-disease
#20
Junyi Li, Yongsheng Yuan, Min Wang, Jiejin Zhang, Li Zhang, Siming Jiang, Jian Ding, Kezhong Zhang
Fatigue is a common complaint in patients with Parkinson's disease (PD). However, the neural bases of fatigue in PD remain uncertain. In this cross-sectional study, our aim was to study the change of the local brain function in PD patients with fatigue. Among 49 patients with PD, 17 of them had fatigue and the remaining 32 patients without fatigue, and 25 age- and gender-matched healthy controls were enrolled. All subjects were evaluated with Fatigue Severity Scale (FSS) and had a resting-state functional magnetic resonance imaging (rs-fMRI) scan...
June 24, 2017: Journal of Neural Transmission
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