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Brain Imaging and Behavior

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https://www.readbyqxmd.com/read/28321608/an-evaluation-of-z-transform-algorithms-for-identifying-subject-specific-abnormalities-in-neuroimaging-data
#1
Andrew R Mayer, Andrew B Dodd, Josef M Ling, Christopher J Wertz, Nicholas A Shaff, Edward J Bedrick, Carlo Viamonte
The need for algorithms that capture subject-specific abnormalities (SSA) in neuroimaging data is increasingly recognized across many neuropsychiatric disorders. However, the effects of initial distributional properties (e.g., normal versus non-normally distributed data), sample size, and typical preprocessing steps (spatial normalization, blurring kernel and minimal cluster requirements) on SSA remain poorly understood. The current study evaluated the performance of several commonly used z-transform algorithms [leave-one-out (LOO); independent sample (IDS); Enhanced Z-score Microstructural Assessment of Pathology (EZ-MAP); distribution-corrected z-scores (DisCo-Z); and robust z-scores (ROB-Z)] for identifying SSA using simulated and diffusion tensor imaging data from healthy controls (N = 50)...
March 20, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28321607/it-s-in-the-eye-of-the-beholder-selective-attention-to-drink-properties-during-tasting-influences-brain-activation-in-gustatory-and-reward-regions
#2
Inge van Rijn, Cees de Graaf, Paul A M Smeets
Statements regarding pleasantness, taste intensity or caloric content on a food label may influence the attention consumers pay to such characteristics during consumption. There is little research on the effects of selective attention on taste perception and associated brain activation in regular drinks. The aim of this study was to investigate the effect of selective attention on hedonics, intensity and caloric content on brain responses during tasting drinks. Using functional MRI brain responses of 27 women were measured while they paid attention to the intensity, pleasantness or caloric content of fruit juice, tomato juice and water...
March 20, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28321606/evidence-for-cognitive-resource-imbalance-in-adolescents-with-narcolepsy
#3
Suzanne T Witt, Natasha Morales Drissi, Sofie Tapper, Anna Wretman, Attila Szakács, Tove Hallböök, Anne-Marie Landtblom, Thomas Karlsson, Peter Lundberg, Maria Engström
The study investigated brain activity changes during performance of a verbal working memory task in a population of adolescents with narcolepsy. Seventeen narcolepsy patients and twenty healthy controls performed a verbal working memory task during simultaneous fMRI and EEG acquisition. All subjects also underwent MRS to measure GABA and Glutamate concentrations in the medial prefrontal cortex. Activation levels in the default mode network and left middle frontal gyrus were examined to investigate whether narcolepsy is characterized by an imbalance in cognitive resources...
March 20, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28321605/long-term-effects-of-stimulant-exposure-on-cerebral-blood-flow-response-to-methylphenidate-and-behavior-in-attention-deficit-hyperactivity-disorder
#4
Anouk Schrantee, C Bouziane, E E Bron, S Klein, M A Bottelier, J J S Kooij, S A R B Rombouts, L Reneman
Stimulant prescription rates for attention deficit hyperactivity disorder (ADHD) are increasing, even though potential long-term effects on the developing brain have not been well-studied. A previous randomized clinical trial showed short-term age-dependent effects of stimulants on the DA system. We here assessed the long-term modifying effects of age-of-first-stimulant treatment on the human brain and behavior. 81 male adult ADHD patients were stratified into three groups: 1) early stimulant treatment (EST; <16 years of age) 2) late stimulant treatment (LST: ≥23 years of age) and 3) stimulant treatment naive (STN; no history of stimulant treatment)...
March 20, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28293804/anomalous-gray-matter-structural-networks-in-recent-onset-post-traumatic-stress-disorder
#5
Shun Qi, Yun-Feng Mu, Long-Biao Cui, Jian Zhang, Fan Guo, Qing-Rong Tan, Mei Shi, Kang Liu, Yi-Bin Xi, Nan-Yin Zhang, Xiao-Liang Zhang, Yong He, Jian Yang, Hong Yin
Alterations of the topological organization of abnormal regions or network-level structural aberrations are still poorly understood for post-traumatic stress disorder (PTSD). Herein, we investigated brain structural networks in recent-onset PTSD patients, all affected by the coalmine-flood disaster. Cortical networks were studied in recent onset PTSD patients (n = 15) and matched healthy controls (n = 25). Cortical networks were constructed by thresholding correlation matrices of 150 regions and quantified using graph theoretical approaches...
March 14, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28293803/altered-resting-state-functional-connectivity-of-the-cerebellum-in-schizophrenia
#6
Chuanjun Zhuo, Chunli Wang, Lina Wang, Xinyu Guo, Qingying Xu, Yanyan Liu, Jiajia Zhu
Structural and functional abnormalities of the cerebellum in schizophrenia have been reported. Most previous studies investigating resting-state functional connectivity (rsFC) have relied on a priori restrictions on seed regions or specific networks, which may bias observations. In this study, we aimed to elicit the connectivity alterations of the cerebellum in schizophrenia in a hypothesis-free approach. Ninety-five schizophrenia patients and 93 sex- and age-matched healthy controls underwent resting-state functional magnetic resonance imaging (fMRI)...
March 14, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28290076/brain-functional-connectivity-in-lung-cancer-population-an-exploratory-study
#7
M Simó, X Rifà-Ros, L Vaquero, P Ripollés, N Cayuela, J Jové, A Navarro, F Cardenal, J Bruna, Antoni Rodríguez-Fornells
The present study aimed to explore the functional connectivity differences in Resting State Networks (RSNs) induced by cancer and chemotherapy in Lung Cancer (LC) patients using an Independent Component Analysis (ICA). Three matched groups of 15 LC patients following Chemotherapy (C+), 15 LC patients before Chemotherapy (C-) and 15 Healthy Controls (HC) were included. Analysis was performed using ICA and a multivariate pattern analysis (MVPA) to classify groups based on profiles of functional connectivity. We found significant differences in four of the RSN identified: Default Mode Network (DMN), Predominantly Left and Right Anterior Temporal Network, and Cerebellum Network...
March 13, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28290075/audio-visual-speech-perception-in-adult-readers-with-dyslexia-an-fmri-study
#8
Jascha Rüsseler, Zheng Ye, Ivonne Gerth, Gregor R Szycik, Thomas F Münte
Developmental dyslexia is a specific deficit in reading and spelling that often persists into adulthood. In the present study, we used slow event-related fMRI and independent component analysis to identify brain networks involved in perception of audio-visual speech in a group of adult readers with dyslexia (RD) and a group of fluent readers (FR). Participants saw a video of a female speaker saying a disyllabic word. In the congruent condition, audio and video input were identical whereas in the incongruent condition, the two inputs differed...
March 13, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28290074/abnormal-brain-white-matter-network-in-young-smokers-a-graph-theory-analysis-study
#9
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/28290073/prefrontal-dysconnectivity-links-to-working-memory-deficit-in-first-episode-schizophrenia
#10
Xiaojing Fang, Yulin Wang, Luqi Cheng, Yuanchao Zhang, Yuan Zhou, Shihao Wu, Huan Huang, Jilin Zou, Cheng Chen, Jun Chen, Huiling Wang, Tianzi Jiang
Working memory (WM) deficit is a core feature of schizophrenia and is characterized by abnormal functional integration in the prefrontal cortex, including the dorsolateral prefrontal cortex (dLPFC), dorsal anterior cingulate cortex (dACC), and ventrolateral prefrontal cortex (vLPFC). However, the specific mechanism by which the abnormal neuronal circuits that involve these brain regions contribute to this deficit is still unclear. Therefore, this study focused on these regions and sought to answer which abnormal causal relationships in these regions can be linked to impaired WM in schizophrenia...
March 13, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28290072/changes-in-brain-white-matter-integrity-after-systemic-treatment-for-breast-cancer-a-prospective-longitudinal-study
#11
Sanne Menning, Michiel B de Ruiter, Dick J Veltman, Willem Boogerd, Hester S A Oldenburg, Liesbeth Reneman, Sanne B Schagen
An increasing number of studies suggest chemotherapy for breast cancer may be neurotoxic. Cross-sectional MRI diffusion tensor imaging (DTI) studies suggest a vulnerability of brain white matter to various chemotherapeutic regimens. Up till now, this was confirmed in one prospective DTI study: Deprez et al. (2012) showed a widespread decline in fractional anisotropy (FA) of breast cancer patients after chemotherapy consisting of 5-fluorouracil (5-FU), epirubicin and cyclophosphamide (FEC) +/- taxanes +/- endocrine treatment...
March 13, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28290071/structural-connectivity-in-spatial-attention-network-reconstruction-from-left-hemispatial-neglect
#12
Takaaki Hattori, Kenji Ito, Chika Nakazawa, Yoshiyuki Numasawa, Mayumi Watanabe, Shigeki Aoki, Hidehiro Mizusawa, Sumio Ishiai, Takanori Yokota
Left hemispatial neglect (neglect) is an impaired state of spatial attention. We aimed to reconstruct structural connectivity in the spatial attention network and to identify disconnection patterns underlying neglect. We enrolled 59 right-handed patients who had their first-ever infarction in the right hemisphere and classified them into neglect group (34 patients with neglect) and control group (25 patients without neglect). The neglect group was further subcategorized into 6 subgroups based on infarcted vascular territories...
March 13, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28290070/parieto-frontal-gyrification-and-working-memory-in-healthy-adults
#13
Sophie Green, Karen Blackmon, Thomas Thesen, Jonathan DuBois, Xiuyuan Wang, Eric Halgren, Orrin Devinsky
Gyrification of the cortical mantle is a dynamic process that increases with cortical surface area and decreases with age. Increased gyrification is associated with higher scores on cognitive tasks in adults; however, the degree to which this relationship is independent of cortical surface area remains undefined. This study investigates whether regional variation in gyrification is associated with domain-general and domain-specific cognition. Our hypothesis is that increased local gyrification confers a functional advantage that is independent of surface area...
March 13, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28271441/modulation-of-locus-coeruleus-activity-by-novel-oddball-stimuli
#14
Ruth M Krebs, Haeme R P Park, Klaas Bombeke, Carsten N Boehler
It has long been known from animal literature that the locus coeruleus (LC), the source region of noradrenergic neurons in the brain, is sensitive to unexpected, novel, and other salient events. In humans, however, direct assessment of LC activity has proven to be challenging due to its small size and difficult localization, which is why noradrenergic activity has often been assessed using more indirect measures such as electroencephalography (EEG) and pupil recordings. Here, we combined high-resolution functional magnetic resonance imaging (fMRI) with a special anatomical sequence to assess neural activity in the LC in response to different types of salient stimuli in an oddball paradigm (novel neutral oddballs, novel emotional oddballs, and familiar target oddballs)...
March 7, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28271440/global-white-matter-microstructural-abnormalities-associated-with-addiction-liability-score-in-drug-na%C3%A3-ve-youth
#15
Leslie Hulvershorn, Tom Hummer, Yu-Chien Wu, Ralph Tarter, Parker Rea, Amit Anand, R Andrew Chambers, Peter Finn
Abnormalities in brain white matter (WM) structure have been reported in youths having a family history of substance use disorders (SUDs). It was hypothesized that these abnormalities constitute features of the liability for SUDs transmitted across generations. The association between severity of intergenerational risk for SUD, measured by the Transmissible Liability Index (TLI), and white matter microstructure was examined. Diffusion tensor imaging (DTI) measured WM microstructure in forty-four drug-naïve 10-14 year-olds (N = 19 with parental SUD)...
March 7, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28271439/relation-of-visual-creative-imagery-manipulation-to-resting-state-brain-oscillations
#16
Yuxuan Cai, Delong Zhang, Bishan Liang, Zengjian Wang, Junchao Li, Zhenni Gao, Mengxia Gao, Song Chang, Bingqing Jiao, Ruiwang Huang, Ming Liu
Visual creative imagery (VCI) manipulation is the key component of visual creativity; however, it remains largely unclear how it occurs in the brain. The present study investigated the brain neural response to VCI manipulation and its relation to intrinsic brain activity. We collected functional magnetic resonance imaging (fMRI) datasets related to a VCI task and a control task as well as pre- and post-task resting states in sequential sessions. A general linear model (GLM) was subsequently used to assess the specific activation of the VCI task compared with the control task...
March 7, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28258362/the-effects-of-grin2b-and-drd4-gene-variants-on-local-functional-connectivity-in-attention-deficit-hyperactivity-disorder
#17
Johanna Inhyang Kim, Jae Hyun Yoo, Dohyun Kim, Bumseok Jeong, Bung-Nyun Kim
Based on the interplay between dopaminergic and glutamatergic systems, N-Methyl-D-Asparate (NMDA) receptor genes are thought to be involved in the pathophysiology of ADHD. However, the phenotypical correlates of brain functions associated with NMDA receptor genes and dopamine receptor genes in ADHD are yet to be investigated. We examined the diagnosis, genotype and the diagnosis-genotype interaction effects of GRIN2B and DRD4 variants on the local functional connectivity (by using the mean of static regional homogeneity (ReHo) and the mean and standard deviation (SD) of dynamic ReHo) in 67 ADHD subjects and 44 controls (aged 6-17 years)...
March 3, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28247158/working-memory-capacity-and-the-functional-connectome-insights-from-resting-state-fmri-and-voxelwise-centrality-mapping
#18
Sebastian Markett, Martin Reuter, Behrend Heeren, Bernd Lachmann, Bernd Weber, Christian Montag
The functional connectome represents a comprehensive network map of functional connectivity throughout the human brain. To date, the relationship between the organization of functional connectivity and cognitive performance measures is still poorly understood. In the present study we use resting-state functional magnetic resonance imaging (fMRI) data to explore the link between the functional connectome and working memory capacity in an individual differences design. Working memory capacity, which refers to the maximum amount of context information that an individual can retain in the absence of external stimulation, was assessed outside the MRI scanner and estimated based on behavioral data from a change detection task...
February 28, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28247157/impaired-white-matter-connectivity-between-regions-containing-mirror-neurons-and-relationship-to-negative-symptoms-and-social-cognition-in-patients-with-first-episode-schizophrenia
#19
Yukiko Saito, Marek Kubicki, Inga Koerte, Tatsui Otsuka, Yogesh Rathi, Ofer Pasternak, Sylvain Bouix, Ryan Eckbo, Zora Kikinis, Christian Clemm von Hohenberg, Tomohide Roppongi, Elisabetta Del Re, Takeshi Asami, Sang-Hyuk Lee, Sarina Karmacharya, Raquelle I Mesholam-Gately, Larry J Seidman, James Levitt, Robert W McCarley, Martha E Shenton, Margaret A Niznikiewicz
In schizophrenia, abnormalities in structural connectivity between brain regions known to contain mirror neurons and their relationship to negative symptoms related to a domain of social cognition are not well understood. Diffusion tensor imaging (DTI) scans were acquired in 16 patients with first episode schizophrenia and 16 matched healthy controls. FA and Trace of the tracts interconnecting regions known to be rich in mirror neurons, i.e., anterior cingulate cortex (ACC), inferior parietal lobe (IPL) and premotor cortex (PMC) were evaluated...
February 28, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28247156/orbitofrontal-overactivation-in-reward-processing-in-borderline-personality-disorder-the-role-of-non-suicidal-self-injury
#20
Daniel Vega, Pablo Ripollés, Àngel Soto, Rafael Torrubia, Joan Ribas, Jose Antonio Monreal, Juan Carlos Pascual, Raymond Salvador, Edith Pomarol-Clotet, Antoni Rodríguez-Fornells, Josep Marco-Pallarés
Borderline Personality Disorder (BPD) is a disabling and difficult-to-treat mental disease. One of its core features is a significant difficulty in affect regulation, which is often accompanied by Non-Suicidal Self-Injury (NSSI). It is suggested that this type of behavior elicits positive emotions and mitigates emotional distress, and therefore can ultimately be reinforced and promoted. In spite of the high prevalence of NSSI behaviors (also in non-BPD samples), their role in modulating reward-related processes has not yet been investigated in BPD patients...
February 28, 2017: Brain Imaging and Behavior
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