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https://www.readbyqxmd.com/read/28343987/age-related-reduction-of-hemispheric-lateralization-for-spatial-attention-an-eeg-study
#1
Gemma Learmonth, Christopher S Y Benwell, Gregor Thut, Monika Harvey
A group-level visuospatial attention bias towards the left side of space (pseudoneglect) is consistently observed in young adults, which is likely to be a consequence of right parieto-occipital dominance for spatial attention. Conversely, healthy older adults demonstrate a rightward shift of this behavioural bias, hinting that an age-related reduction of lateralised neural activity may occur within visuospatial attention networks. We compared young (aged 18-25) and older (aged 60-80) adults on a computerised line bisection (landmark) task whilst recording event-related potentials (ERPs)...
March 23, 2017: NeuroImage
https://www.readbyqxmd.com/read/28343728/can-apparent-diffusion-coefficient-predict-the-clinical-outcome-in%C3%A2-drowned-children
#2
Adrian Hruşcã, Andreea Liana Rãchişan, Siegfried Rödl, Erich Sorantin
INTRODUCTION: Pediatric cerebral hypoxic-ischemic injury frequently results in severe neurological outcome. Imaging with diffusion-weighted magnetic resonance imaging (DWi) demonstrates that the acute cerebral injury and apparent diffusion coefficient (ADC) allow the assessment of the severity of brain damage. The main objective was to examine if spatial distribution of reductions in ADC values is associated with clinical outcome in drowned children. METHODS: This is a retrospective study of 7 children (7 examinations) suffering from a hypoxic-ischemic event who underwent DWi...
March 23, 2017: Canadian Association of Radiologists Journal, Journal L'Association Canadienne des Radiologistes
https://www.readbyqxmd.com/read/28342780/a-neural-basis-for-the-visual-sense-of-number-and-its-development-a-steady-state-visual-evoked-potential-study-in-children-and-adults
#3
Joonkoo Park
While recent studies in adults have demonstrated the existence of a neural mechanism for a visual sense of number, little is known about its development and whether such a mechanism exists at young ages. In the current study, I introduce a novel steady-state visual evoked potential (SSVEP) technique to objectively quantify early visual cortical sensitivity to numerical and non-numerical magnitudes of a dot array. I then examine this neural sensitivity to numerical magnitude in children between three and ten years of age and in college students...
March 2, 2017: Developmental Cognitive Neuroscience
https://www.readbyqxmd.com/read/28342092/evaluation-of-structural-connectivity-changes-in-betel-quid-chewers-using-generalized-q-sampling-mri
#4
Jun-Cheng Weng, Te-Wei Kao, Guo-Joe Huang, Yeu-Sheng Tyan, Hsien-Chun Tseng, Ming-Chou Ho
RATIONALE: Betel quid (BQ) is a common addictive substance in many Asian countries. However, few studies have focused on the influences of BQ on the brain. It remains unclear how BQ can affect structural brain abnormalities in BQ chewers. OBJECTIVES: We aimed to use generalized q-sampling imaging (GQI) to evaluate the impact of the neurological structure of white matter caused by BQ. METHODS: The study population comprised 16 BQ chewers, 15 tobacco and alcohol controls, and 17 healthy controls...
March 24, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28341872/childhood-adversity-associated-with-white-matter-alteration-in-the-corpus-callosum-corona-radiata-and-uncinate-fasciculus-of-psychiatrically-healthy-adults
#5
Simon McCarthy-Jones, Lena K L Oestreich, Amanda E Lyall, Zora Kikinis, Dominick T Newell, Peter Savadjiev, Martha E Shenton, Marek Kubicki, Ofer Pasternak, Thomas J Whitford
Diffusion tensor imaging studies report childhood adversity (CA) is associated with reduced fractional anisotropy (FA) in multiple white matter tracts in adults. Reduced FA may result from changes in tissue, suggesting myelin/axonal damage, and/or from increased levels of extracellular free-water, suggesting atrophy or neuroinflammation. Free-water imaging can separately identify FA in tissue (FAT) and the fractional volume of free-water (FW). We tested whether CA was associated with altered FA, FAT, and FW in seven white matter regions of interest (ROI), in which FA changes had been previously linked to CA (corona radiata, corpus callosum, fornix, cingulum bundle: hippocampal projection, inferior fronto-occipital fasciculus, superior longitudinal fasciculus, uncinate fasciculus)...
March 25, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28340498/academic-difficulties-in-children-with-prenatal-alcohol-exposure-presence-profile-and-neural-correlates
#6
Leila Glass, Eileen M Moore, Natacha Akshoomoff, Kenneth Lyons Jones, Edward P Riley, Sarah N Mattson
BACKGROUND: Academic achievement was evaluated in children with heavy prenatal alcohol exposure to determine potential strengths and weaknesses, evaluate the utility of different definitions for identifying low academic performance, and explore the neural correlates that may underlie academic performance. METHODS: Children (8 to 16 years) were assessed using the WIAT-II. Patterns of performance were examined in 2 subject groups: children with heavy prenatal alcohol exposure (n = 67) and controls (n = 61)...
March 24, 2017: Alcoholism, Clinical and Experimental Research
https://www.readbyqxmd.com/read/28340448/structural-correlates-of-creative-thinking-in-patients-with-bipolar-disorder-and-healthy-controls-a-voxel-based-morphometry-study
#7
Pei-Chi Tu, Yi-Hsuan Kuan, Cheng-Ta Li, Tung-Ping Su
BACKGROUND: This study investigated the structural correlates of creative thinking in patients with bipolar disorder (BD) to understand the possible neural mechanism of creative thinking in BD. METHODS: We recruited 59 patients with BD I or BD II (35.3±8.5 y) and 56 age- and sex-matched controls (HCs; 34±7.4 y). Each participant underwent structural magnetic resonance imaging and evaluation of creative thinking, which was assessed using two validated tools: the Chinese version of the Abbreviated Torrance Test for Adults for divergent thinking and the Chinese Word Remote Associates Test for remote association...
March 12, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28340443/quantitative-eeg-abnormalities-in-major-depressive-disorder-with-basal-ganglia-stroke-with-lesions-in-different-hemispheres
#8
Chunfang Wang, Yuanyuan Chen, Ying Zhang, Jin Chen, Xiaojing Ding, Dong Ming, Jingang Du
BACKGROUND: This study aimed to examine the aberrant EEG oscillation in major depressive subjects with basal ganglia stroke with lesions in different hemispheres. METHODS: Resting EEG of 16 electrodes in 58 stroke subjects, 26 of whom had poststroke depression (13 with left-hemisphere lesion and 13 with right) and 32 of whom did not (18 with left lesion and 14 with right), was recorded to obtain spectral power analysis for several frequency bands. Multiple analysis of variance and receiver operating characteristic (ROC) curves were used to identify differences between poststroke depression (PSD) and poststroke non-depression (PSND), treating the different lesion hemispheres separately...
February 28, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28339164/are-schizophrenia-autistic-and-obsessive-spectrum-disorders-dissociable-on-the-basis-of-neuroimaging-morphological-findings-a-voxel-based-meta-analysis
#9
Franco Cauda, Tommaso Costa, Andrea Nani, Luciano Fava, Sara Palermo, Francesca Bianco, Sergio Duca, Karina Tatu, Roberto Keller
Schizophrenia spectrum disorder (SCZD), autism spectrum disorder (ASD), and obsessive-compulsive spectrum disorder (OCSD) are considered as three separate psychiatric conditions with, supposedly, different brain alterations patterns. From a neuroimaging perspective, this meta-analytic study aimed to address whether this nosographical differentiation is actually supported by different brain patterns of gray matter (GM) or white matter (WM) morphological alterations. We explored two possibilities: (a) to find out whether GM alterations are specific for SCZD, ASD, and OCSD; and (b) to associate the identified brain alteration patterns with cognitive dysfunctions by means of an analysis of lesion decoding...
March 24, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28338765/cerebral-magnesium-levels-in-preeclampsia-a-phosphorus-magnetic-resonance-spectroscopy-study
#10
Maria Nelander, Jan Weis, Lina Bergman, Anders Larsson, Anna-Karin Wikström, Johan Wikström
BACKGROUND: Magnesium sulfate (MgSO4) is used as a prophylaxis for eclamptic seizures. The exact mechanism of action is not fully established. We used phosphorus magnetic resonance spectroscopy (31P-MRS) to investigate if cerebral magnesium (Mg2+) levels differ between women with preeclampsia, normal pregnant, and nonpregnant women. METHODS: This cross-sectional study comprised 28 women with preeclampsia, 30 women with normal pregnancies in corresponding gestational week (range: 23-41 weeks) and 11 nonpregnant healthy controls...
February 21, 2017: American Journal of Hypertension
https://www.readbyqxmd.com/read/28338574/rigid-occipitocervical-instrumented-fusion-for-atlantoaxial-instability-in-an-18-month-old-toddler-with-brachytelephalangic-chondrodysplasia-punctata-a-case-report
#11
Hiroki Oba, Jun Takahashi, Kyoko Takano, Yuji Inaba, Mitsuo Motobayashi, Gen Nishimura, Shugo Kuraishi, Masayuki Shimizu, Shota Ikegami, Toshimasa Futatsugi, Masashi Uehara, Tomoki Kosho, Hiroyuki Kato, Koki Uno
STUDY DESIGN: Case report OBJECTIVE.: We report here on an 18-month-old boy with brachytelephalangic chondrodysplasia punctata (BCDP), whose atlantoaxial instability was successfully managed with occipitocervical instrumented fusion (OCF) using screw and rod instrumentations. SUMMARY OF BACKGROUND DATA: Recently, there have been a number of reports on BCDP with early onset of cervical myelopathy. Surgical OCF is a vital intervention to salvage affected individuals from the life-threatening morbidity...
March 23, 2017: Spine
https://www.readbyqxmd.com/read/28336919/altered-spontaneous-brain-activity-in-chronic-smokers-revealed-by-fractional-ramplitude-of-low-frequency-fluctuation-analysis-a-preliminary-study
#12
Chao Wang, Zhujing Shen, Peiyu Huang, Hualiang Yu, Wei Qian, Xiaojun Guan, Quanquan Gu, Yihong Yang, Minming Zhang
Although a substantial body of previous functional magnetic resonance imaging (fMRI) studies have revealed different brain responses to external stimuli in chronic cigarette smokers compared with nonsmokers, only a few studies assessed brain spontaneous activity in the resting state in chronic smokers. The aim of this study was to investigate alterations of brain activity during the resting state in chronic smokers using fractional amplitude of low-frequency fluctuation (fALFF). In the present study, 55 smokers and 49 healthy nonsmokers were included...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28336427/high-resolution-anatomical-and-quantitative-mri-of-the-entire-human-occipital-lobe-ex-vivo-at-9-4t
#13
S Sengupta, F J Fritz, R L Harms, S Hildebrand, D H Y Tse, B A Poser, R Goebel, A Roebroeck
Several magnetic resonance imaging (MRI) contrasts are sensitive to myelin content in gray matter in vivo which has ignited ambitions of MRI-based in vivo cortical histology. Ultra-high field (UHF) MRI, at fields of 7T and beyond, is crucial to provide the resolution and contrast needed to sample contrasts over the depth of the cortex and get closer to layer resolved imaging. Ex vivo MRI of human post mortem samples is an important stepping stone to investigate MRI contrast in the cortex, validate it against histology techniques applied in situ to the same tissue, and investigate the resolutions needed to translate ex vivo findings to in vivo UHF MRI...
March 20, 2017: NeuroImage
https://www.readbyqxmd.com/read/28336195/cognitive-correlates-of-visual-neural-plasticity-in-schizophrenia
#14
Carol Jahshan, Jonathan K Wynn, Daniel H Mathalon, Michael F Green
Neuroplasticity may be an important treatment target to improve the cognitive deficits in schizophrenia (SZ). Yet, it is poorly understood and difficult to assess. Recently, a visual high-frequency stimulation (HFS) paradigm that potentiates electroencephalography (EEG)-based visual evoked potentials (VEP) has been developed to assess neural plasticity in the visual cortex. Using this paradigm, we examined visual plasticity in SZ patients (N=64) and its correlations with clinical symptoms, neurocognition, functional capacity, and community functioning...
March 20, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28335039/brain-temporal-complexity-in-explaining-the-therapeutic-and-cognitive-effects-of-seizure-therapy
#15
Faranak Farzan, Sravya Atluri, Ye Mei, Sylvain Moreno, Andrea J Levinson, Daniel M Blumberger, Zafiris J Daskalakis
Over 350 million people worldwide suffer from depression, a third of whom are medication-resistant. Seizure therapy remains the most effective treatment in depression, even when many treatments fail. The utility of seizure therapy is limited due to its cognitive side effects and stigma. The biological targets of seizure therapy remain unknown, hindering design of new treatments with comparable efficacy. Seizures impact the brains temporal dynamicity observed through electroencephalography. This dynamicity reflects richness of information processing across distributed brain networks subserving affective and cognitive processes...
March 3, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28334965/photosensitive-epilepsy-is-associated-with-reduced-inhibition-of-alpha-rhythm-generating-networks
#16
Anna Elisabetta Vaudano, Andrea Ruggieri, Pietro Avanzini, Giuliana Gessaroli, Gaetano Cantalupo, Antonietta Coppola, Sanjay M Sisodiya, Stefano Meletti
Photosensitivity is a condition in which lights induce epileptiform activities. This abnormal electroencephalographic response has been associated with hyperexcitability of the visuo-motor system. Here, we evaluate if intrinsic dysfunction of this network is present in brain activity at rest, independently of any stimulus and of any paroxysmal electroencephalographic activity. To address this issue, we investigated the haemodynamic correlates of the spontaneous alpha rhythm, which is considered the hallmark of the brain resting state, in photosensitive patients and in people without photosensitivity...
February 20, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28334883/selective-impairment-of-hippocampus-and-posterior-hub-areas-in-alzheimer-s-disease-an-meg-based-multiplex-network-study
#17
Meichen Yu, Marjolein M A Engels, Arjan Hillebrand, Elisabeth C W van Straaten, Alida A Gouw, Charlotte Teunissen, Wiesje M van der Flier, Philip Scheltens, Cornelis J Stam
Although frequency-specific network analyses have shown that functional brain networks are altered in patients with Alzheimer's disease, the relationships between these frequency-specific network alterations remain largely unknown. Multiplex network analysis is a novel network approach to study complex systems consisting of subsystems with different types of connectivity patterns. In this study, we used magnetoencephalography to integrate five frequency-band specific brain networks in a multiplex framework...
March 16, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28334217/testosterone-effects-on-the-brain-in-transgender-men
#18
Sarah M Burke, Amir H Manzouri, Cecilia Dhejne, Karin Bergström, Stefan Arver, Jamie D Feusner, Ivanka Savic-Berglund
Transgender individuals experience incongruence between their gender identity and birth-assigned sex. The resulting gender dysphoria (GD), which some gender-incongruent individuals experience, is theorized to be a consequence of atypical cerebral sexual differentiation, but support for this assertion is inconsistent. We recently found that GD is associated with disconnected networks involved in self-referential thinking and own body perception. Here, we investigate how these networks in trans men (assigned female at birth with male gender identity) are affected by testosterone...
March 10, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28334214/tdcs-modulates-visual-gamma-oscillations-and-basal-alpha-activity-in-occipital-cortices-evidence-from-meg
#19
Tony W Wilson, Timothy J McDermott, Mackenzie S Mills, Nathan M Coolidge, Elizabeth Heinrichs-Graham
Transcranial direct-current stimulation (tDCS) is now a widely used method for modulating the human brain, but the resulting physiological effects are not understood. Recent studies have combined magnetoencephalography (MEG) with simultaneous tDCS to evaluate online changes in occipital alpha and gamma oscillations, but no study to date has quantified the offline (i.e., after tDCS) alterations in these responses. Thirty-five healthy adults received active or sham anodal tDCS to the occipital cortices, and then completed a visual stimulation paradigm during MEG that is known to elicit robust gamma and alpha oscillations...
March 10, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28332557/differential-effects-of-face-realism-and-emotion-on-event-related-brain-potentials-and-their-implications-for-the-uncanny-valley-theory
#20
Sebastian Schindler, Eduard Zell, Mario Botsch, Johanna Kissler
Cartoon characters are omnipresent in popular media. While few studies have scientifically investigated their processing, in computer graphics, efforts are made to increase realism. Yet, close approximations of reality have been suggested to evoke sometimes a feeling of eeriness, the "uncanny valley" effect. Here, we used high-density electroencephalography to investigate brain responses to professionally stylized happy, angry, and neutral character faces. We employed six face-stylization levels varying from abstract to realistic and investigated the N170, early posterior negativity (EPN), and late positive potential (LPP) event-related components...
March 23, 2017: Scientific Reports
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