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https://www.readbyqxmd.com/read/28093279/obesity-and-insulin-resistance-are-associated-with-reduced-activity-in-core-memory-regions-of-the-brain
#1
Lucy G Cheke, Heidi M Bonnici, Nicola S Clayton, Jon S Simons
Increasing research in animals and humans suggests that obesity may be associated with learning and memory deficits, and in particular with reductions in episodic memory. Rodent models have implicated the hippocampus in obesity-related memory impairments, but the neural mechanisms underlying episodic memory deficits in obese humans remain undetermined. In the present study, lean and obese human participants were scanned using fMRI while completing a What-Where-When episodic memory test (the "Treasure-Hunt Task") that assessed the ability to remember integrated item, spatial, and temporal details of previously encoded complex events...
January 13, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28092055/differentiating-emotional-processing-and-attention-in-psychopathy-with-functional-neuroimaging
#2
Nathaniel E Anderson, Vaughn R Steele, J Michael Maurer, Vikram Rao, Michael R Koenigs, Jean Decety, David S Kosson, Vince D Calhoun, Kent A Kiehl
Individuals with psychopathy are often characterized by emotional processing deficits, and recent research has examined the specific contexts and cognitive mechanisms that underlie these abnormalities. Some evidence suggests that abnormal features of attention are fundamental to emotional deficits in persons with psychopathy, but few studies have demonstrated the neural underpinnings responsible for such effects. Here, we use functional neuroimaging to examine attention-emotion interactions among incarcerated individuals (n = 120) evaluated for psychopathic traits using the Hare Psychopathy Checklist-Revised (PCL-R)...
January 16, 2017: Cognitive, Affective & Behavioral Neuroscience
https://www.readbyqxmd.com/read/28088041/the-role-of-the-ifg-and-psts-in-syntactic-prediction-evidence-from-a-parametric-study-of-hierarchical-structure-in-fmri
#3
William Matchin, Christopher Hammerly, Ellen Lau
Sentences encode hierarchical structural relations among words. Several neuroimaging experiments aiming to localize combinatory operations responsible for creating this structure during sentence comprehension have contrasted short, simple phrases and sentences to unstructured controls. Some of these experiments have revealed activation in the left inferior frontal gyrus (IFG) and posterior superior temporal sulcus (pSTS), associating these regions with basic syntactic combination. However, the wide variability of these effects across studies raises questions about this interpretation...
December 18, 2016: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28077311/cortical-thickness-increases-after-simultaneous-interpretation-training
#4
Alexis Hervais-Adelman, Barbara Moser-Mercer, Micah M Murray, Narly Golestani
Simultaneous interpretation is a complex cognitive task that not only demands multilingual language processing, but also requires application of extreme levels of domain-general cognitive control. We used MRI to longitudinally measure cortical thickness in simultaneous interpretation trainees before and after a Master's program in conference interpreting. We compared them to multilingual control participants scanned at the same interval of time. Increases in cortical thickness were specific to trainee interpreters...
January 9, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28077212/decoding-the-content-of-recollection-within-the-core-recollection-network-and-beyond
#5
Preston P Thakral, Tracy H Wang, Michael D Rugg
Recollection - retrieval of qualitative information about a past event - is associated with enhanced neural activity in a consistent set of neural regions (the 'core recollection network') seemingly regardless of the nature of the recollected content. Here, we employed multi-voxel pattern analysis (MVPA) to assess whether retrieval-related functional magnetic resonance imaging (fMRI) activity in core recollection regions - including the hippocampus, angular gyrus, medial prefrontal cortex, retrosplenial/posterior cingulate cortex, and middle temporal gyrus - contain information about studied content and thus demonstrate retrieval-related 'reinstatement' effects...
December 22, 2016: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28072384/impact-of-cerebellar-atrophy-on-cortical-gray-matter-and-cerebellar-peduncles-as-assessed-by-voxel-based-morphometry-and-high-angular-resolution-diffusion-imaging
#6
Michael Dayan, G Olivito, M Molinari, Mara Cercignani, Marco Bozzali, M Leggio
In recent years the cerebellum has been attributed amore important role in higher-level functions than previously believed. We examined a cohort of patients suffering from cerebellar atrophy resulting in ataxia, with two main objectives: first to investigate which regions of the cerebrum were affected by the cerebellar degeneration, and second to assess whether diffusion magnetic resonance imaging (dMRI) metrics within the medial (MCP) and superior cerebellar peduncle (SCP) - namely fractional anisotropy (FA) and radial diffusivity (RD) - could be used as a biomarker in patients with this condition...
October 2016: Functional Neurology
https://www.readbyqxmd.com/read/28069530/structural-changes-in-functionally-illiterate-adults-after-intensive-training
#7
Melanie Boltzmann, Bahram Mohammadi, Amir Samii, Thomas F Münte, Jascha Rüsseler
About 7.5million adults in Germany cannot read and write properly despite attending school for several years. They are considered to be functional illiterates. Since the ability to read and write is crucial for being employed and socially accepted, we developed a literacy training to overcome these deficits. In this study, we investigate the structural changes induced by the training. A group of 20 functional illiterates and 20 adult normal readers participated in the study. Group differences as well as intervention-related changes in gray (voxel-based morphometry, VBM) and white matter (Tract-Based Spatial Statistics, TBSS, applied to fractional anisotropy, FA, obtained with diffusion tensor imaging, DTI) were assessed in functional illiterates and normal reading controls...
January 7, 2017: Neuroscience
https://www.readbyqxmd.com/read/28057091/-resting-state-functional-magnetic-resonance-study-of-brain-function-changes-after-tips-operation-in-patients-with-liver-cirrhosis
#8
C Liu, H B Wang, Y Q Yu, M Q Wang, G B Zhang, L Y Xu, J M Wu
Objective: To investigate the brain function changes in cirrhosis patients after transjugular intrahepatic portosystemic shunt (TIPS), resting-state functional MRI (rs-fMRI) performed and fractional amplitude of low frequency fluctuation (fALFF) was analyzed. Methods: From January 2014 to February 2016, a total of 96 cirrhotic patients from invasive technology department and infection department in the First Affiliated Hospital of Anhui Medical University were selected , the blood ammonia data of 96 cirrhotic patients with TIPS operation in four groups were collected after 1, 3, 6 and 12 month, and all subjects performed rs-fMRI scans...
December 20, 2016: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28045222/correspondent-functional-topography-of-the-human-left-inferior-parietal-lobule-at-rest-and-under-task-revealed-using-resting-state-fmri-and-coactivation-based-parcellation
#9
Jiaojian Wang, Sangma Xie, Xin Guo, Benjamin Becker, Peter T Fox, Simon B Eickhoff, Tianzi Jiang
The human left inferior parietal lobule (LIPL) plays a pivotal role in many cognitive functions and is an important node in the default mode network (DMN). Although many previous studies have proposed different parcellation schemes for the LIPL, the detailed functional organization of the LIPL and the exact correspondence between the DMN and LIPL subregions remain unclear. Mounting evidence indicates that spontaneous fluctuations in the brain are strongly associated with cognitive performance at the behavioral level...
January 3, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28041652/abnormal-spontaneous-brain-activity-in-type-2-diabetic-retinopathy-revealed-by-amplitude-of-low-frequency-fluctuations-a-resting-state-fmri-study
#10
Z-L Wang, L Zou, Z-W Lu, X-Q Xie, Z-Z Jia, C-J Pan, G-X Zhang, X-M Ge
AIM: To explore the altered spontaneous cerebral activity patterns and impaired functional regions in patients with diabetic retinopathy (DR) using resting-state functional magnetic resonance imaging (rs-fMRI) based on the amplitude of low-frequency fluctuations (ALFF) algorithm. MATERIALS AND METHODS: Twenty-one patients with DR (mean age, 54.9±9.9 years; 11 females) and 17 healthy control subjects (54.8±5.7 years; 9 females) were prospectively studied. The DR patients underwent laboratory tests...
December 29, 2016: Clinical Radiology
https://www.readbyqxmd.com/read/28038366/brain-networks-underlying-novel-metaphor-production
#11
Roger E Beaty, Paul J Silvia, Mathias Benedek
Metaphors are widely used to convey abstract concepts and emotions in the arts and everyday life. Neuroimaging research suggests that dynamic interactions among large-scale brain networks, including the default and executive control networks, support the production of such creative ideas. However, the extent to which these networks interact to support other forms of creative language production such as metaphor remains unknown. Using functional magnetic resonance imaging (fMRI), we explored this question by assessing functional interactions between brain regions during novel metaphor production...
February 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28035923/neural-correlates-of-self-reference-effect-in-early-alzheimer-s-disease
#12
Malo Gaubert, Nicolas Villain, Brigitte Landeau, Florence Mézenge, Stéphanie Egret, Audrey Perrotin, Serge Belliard, Vincent de La Sayette, Francis Eustache, Béatrice Desgranges, Gaël Chételat, Géraldine Rauchs
Information that is processed with reference to the self (i.e., self-referential processing, SRP) is generally associated with better remembering than information processed in a semantic condition. This benefit of self on memory performance is called self-reference effect (SRE). In the present study, we assessed changes in the SRE and SRP-related brain activity in patients diagnosed with mild cognitive impairment or early Alzheimer's disease (MCI/AD). Fifteen patients with confirmed amyloid-β deposits (positive florbetapir-PET scan) and 28 healthy controls (negative florbetapir-PET scan) were included...
December 30, 2016: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28025017/automatic-numerical-spatial-association-in-synaesthesia-an-fmri-investigation
#13
Isabel Arend, Sarit Ashkenazi, Kenneth Yuen, Shiran Ofir, Avishai Henik
A horizontal mental number line (MNL) is used to describe how quantities are represented across space. In humans, the neural correlates associated with such a representation are found in different areas of the posterior parietal cortex, especially, the intraparietal sulcus (IPS). In a phenomenon known as number-space synaesthesia, individuals visualise numbers in specific spatial locations. The experience of a MNL for number-space synaesthetes is explicit, idiosyncratic, and highly stable over time. It remains an open question whether the mechanisms underlying numerical-spatial association are shared by synaesthetes and nonsynaesthetes...
December 23, 2016: Neuropsychologia
https://www.readbyqxmd.com/read/28009080/disruptions-in-the-left-frontoparietal-network-underlie-resting-state-endophenotypic-markers-in-schizophrenia
#14
George Chahine, Anja Richter, Sarah Wolter, Roberto Goya-Maldonado, Oliver Gruber
Advances in functional brain imaging have improved the search for potential endophenotypic markers in schizophrenia. Here, we employed independent component analysis (ICA) and dynamic causal modeling (DCM) in resting state fMRI on a sample of 35 schizophrenia patients, 20 first-degree relatives and 35 control subjects. Analysis on ICA-derived networks revealed increased functional connectivity between the left frontoparietal network (FPN) and left temporal and parietal regions in schizophrenia patients (P < 0...
December 23, 2016: Human Brain Mapping
https://www.readbyqxmd.com/read/27995061/neural-basis-of-distorted-self-face-recognition-in-social-anxiety-disorder
#15
Min-Kyeong Kim, Hyung-Jun Yoon, Yu-Bin Shin, Seung-Koo Lee, Jae-Jin Kim
BACKGROUND: The observer perspective causes patients with social anxiety disorder (SAD) to excessively inspect their performance and appearance. This study aimed to investigate the neural basis of distorted self-face recognition in non-social situations in patients with SAD. METHODS: Twenty patients with SAD and 20 age- and gender-matched healthy controls participated in this fMRI study. Data were acquired while participants performed a Composite Face Evaluation Task, during which they had to press a button indicating how much they liked a series of self-faces, attractively transformed self-faces, and attractive others' faces...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27989909/altered-regional-homogeneity-of-brain-spontaneous-signals-in-siv-infected-rhesus-macaque-model
#16
Jing Zhao, Bin Jing, Feng Chen, Jiaojiao Liu, Yuanyuan Wang, Hongjun Li
BACKGROUND: Regional homogeneity (ReHo), a measurement from resting-state functional magnetic imaging (rs-fMRI) to reflect local synchronization of brain activities, has been widely explored in previous studies of neurological diseases. SIV infected model for detecting the neurological changes with progression was studied. METHODS: In the study, six rhesus macaques infected by simian immunodeficiency virus (SIV) were scanned by resting-state fMRI at the following time points: before SIV inoculation (baseline), 12weeks and 24weeks post inoculation (12wpi, 24wpi)...
October 27, 2016: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/27984680/mitochondrial-activity-in-the-frontal-cortex-area-8-and-angular-gyrus-in-parkinson-s-disease-and-parkinson-s-disease-with-dementia
#17
Paula Garcia-Esparcia, Anusha Koneti, M Cruz Rodríguez-Oroz, Belen Lago, José Antonio Del Rio, Isidro Ferrer
Altered mitochondrial function is characteristic in the substantia nigra in Parkinson's disease (PD). Information about mitochondria in other brain regions such as the cerebral cortex is conflicting mainly because most studies have not contemplated the possibility of variable involvement depending on the region, stage of disease progression, and clinical symptoms such as the presence or absence of dementia. RT-qPCR of 18 nuclear mRNAs encoding subunits of mitochondrial complexes and 12 mRNAs encoding energy metabolism-related enzymes; western blotting of mitochondrial proteins; and analysis of enzymatic activities of complexes I, II, II, IV and V of the respiratory chain were assessed in frontal cortex area 8 and the angular gyrus of middle-aged individuals (MA), and those with incidental PD (iPD), long-lasting PD with parkinsonism without dementia (PD) and long-lasting PD with dementia (PDD)...
December 16, 2016: Brain Pathology
https://www.readbyqxmd.com/read/27981028/regional-correlations-between-11-c-pib-pet-and-post-mortem-burden-of-amyloid-beta-pathology-in-a-diverse-neuropathological-cohort
#18
Sang Won Seo, Nagehan Ayakta, Lea T Grinberg, Sylvia Villeneuve, Manja Lehmann, Bruce Reed, Charles DeCarli, Bruce L Miller, Howard J Rosen, Adam L Boxer, James P O'Neil, Lee-Way Jin, William W Seeley, William J Jagust, Gil D Rabinovici
Imaging-pathological correlation studies show that in vivo amyloid-β (Aβ) positron emission tomography (PET) strongly predicts the presence of significant Aβ pathology at autopsy. We sought to determine whether regional PiB-PET uptake would improve sensitivity for amyloid detection in comparison with global measures (experiment 1), and to estimate the relative contributions of different Aβ aggregates to in vivo PET signal (experiment 2). In experiment 1, 54 subjects with [(11)C] PiB-PET during life and postmortem neuropathologic examination (85...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27966612/sex-differences-in-number-processing-differential-systems-for-subtraction-and-multiplication-were-confirmed-in-men-but-not-in-women
#19
Belinda Pletzer
Neuroimaging studies suggest segregated neuronal systems underlying number magnitude processing (e.g. subtraction) and arithmetic fact retrieval (e.g. multiplication). While number magnitude processing is thought to rely on the intraparietal sulcus (IPS) bilaterally, arithmetic fact retrieval is thought to rely on the left angular gyrus (AG). However, evidence from brain damaged patients and brain stimulation challenges this view and suggests considerable overlap between the systems underlying number magnitude processing and arithmetic fact retrieval...
December 14, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27956067/the-action-imitation-network-and-motor-imitation-in-children-and-adolescents-with-autism
#20
Heather M Wadsworth, Jose O Maximo, Amy R Lemelman, Kacy Clayton, Soumya Sivaraman, Hrishikesh D Deshpande, Lawrence Ver Hoef, Rajesh K Kana
While deficits in imitation had been reported in children with autism spectrum disorder (ASD), its exact nature remains unclear. A dysfunction in mirroring mechanisms (through action imitation) has been proposed by some studies to explain this, although some recent evidence points against this hypothesis. The current study used behavior and functional MRI to examine the integrated functioning of the regions that are considered part of the Action Imitation network (AIN) in children and adolescents with ASD during a motor imitation task...
December 10, 2016: Neuroscience
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