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Cognition and functional connectivity

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https://www.readbyqxmd.com/read/29244639/oscillatory-mechanisms-of-response-conflict-elicited-by-color-and-motion-direction-an-individual-differences-approach
#1
Marlies E Vissers, K Richard Ridderinkhof, Michael X Cohen, Heleen A Slagter
Goal-directed behavior requires control over automatic behavior, for example, when goal-irrelevant information from the environment captures an inappropriate response and conflicts with the correct, goal-relevant action. Neural oscillations in the theta band (∼6 Hz) measured at midfrontal electrodes are thought to form an important substrate of the detection and subsequent resolution of response conflict. Here, we examined the extent to which response conflict and associated theta-band activity depend on the visual stimulus feature dimension that triggers the conflict...
December 15, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/29243529/avolition-apathy-and-white-matter-connectivity-in-schizophrenia-reduced-fractional-anisotropy-between-amygdala-and-insular-cortex
#2
Antonella Amodio, Mario Quarantelli, Armida Mucci, Anna Prinster, Andrea Soricelli, Annarita Vignapiano, Giulia Maria Giordano, Eleonora Merlotti, Alessia Nicita, Silvana Galderisi
The avolition/apathy domain of negative symptoms includes motivation- and pleasure-related impairments. In people with schizophrenia, structural and functional abnormalities were reported in key regions within the motivational reward system, including ventral-tegmental area (VTA), striatum (especially at the level of the nucleus accumbens, NAcc), orbitofrontal cortex (OFC), as well as amygdala (Amy) and insular cortex (IC). However, the association of the reported abnormalities with avoliton-apathy is still controversial...
January 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29239789/anterior-cingulate-volume-predicts-response-to-psychotherapy-and-functional-connectivity-with-the-inferior-parietal-cortex-in-major-depressive-disorder
#3
Fabio Sambataro, Nadja Doerig, Jürgen Hänggi, Robert Christian Wolf, Janis Brakowski, Martin Grosse Holtforth, Erich Seifritz, Simona Spinelli
In major depressive disorder (MDD), the anterior cingulate cortex (ACC) has been associated with clinical outcome as well as with antidepressant treatment response. Nonetheless, the association between individual differences in ACC structure and function and the response to cognitive behavioral therapy (CBT) is still unexplored. For this aim, twenty-five unmedicated patients with MDD were scanned with structural and resting state functional magnetic resonance imaging before the beginning of CBT treatment. ACC morphometry was correlated with clinical changes following psychotherapy...
November 24, 2017: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29239622/coactivation-of-cognitive-control-networks-during-task-switching
#4
Shouhang Yin, Gedeon Deák, Antao Chen
OBJECTIVE: The ability to flexibly switch between tasks is considered an important component of cognitive control that involves frontal and parietal cortical areas. The present study was designed to characterize network dynamics across multiple brain regions during task switching. METHOD: Functional magnetic resonance images (fMRI) were captured during a standard rule-switching task to identify switching-related brain regions. Multiregional psychophysiological interaction (PPI) analysis was used to examine effective connectivity between these regions...
December 14, 2017: Neuropsychology
https://www.readbyqxmd.com/read/29239063/stimulating-neural-plasticity-with-real-time-fmri-neurofeedback-in-huntington-s-disease-a-proof-of-concept-study
#5
Marina Papoutsi, Nikolaus Weiskopf, Douglas Langbehn, Ralf Reilmann, Geraint Rees, Sarah J Tabrizi
Novel methods that stimulate neuroplasticity are increasingly being studied to treat neurological and psychiatric conditions. We sought to determine whether real-time fMRI neurofeedback training is feasible in Huntington's disease (HD), and assess any factors that contribute to its effectiveness. In this proof-of-concept study, we used this technique to train 10 patients with HD to volitionally regulate the activity of their supplementary motor area (SMA). We collected detailed behavioral and neuroimaging data before and after training to examine changes of brain function and structure, and cognitive and motor performance...
December 13, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/29235884/cost-per-successfully-treated-patient-for-vortioxetine-versus-duloxetine-in-adults-with-major-depressive-disorder-an-analysis-of-the-complete-symptoms-of-depression-and-functional-outcome
#6
Michael Cronquist Christensen, Vicki Munro
OBJECTIVE: To determine the cost-effectiveness of vortioxetine versus duloxetine in adults with moderate to severe major depressive disorder (MDD) in Norway using a definition of a successfully treated patient (STP) that incorporates improvement in both mood symptoms and functional capacity. METHODS: Using the population of patients who completed the 8-week CONNECT study, the cost-effectiveness of vortioxetine (n = 168) (10-20 mg/day) versus duloxetine (n = 176) (60 mg/day) was investigated for the treatment of adults in Norway with moderate to severe MDD and self-reported cognitive dysfunction over an 8-week treatment period...
December 13, 2017: Current Medical Research and Opinion
https://www.readbyqxmd.com/read/29231140/up-regulation-of-dmn-connectivity-in-mild-cognitive-impairment-via-network-based-cognitive-training
#7
Matteo De Marco, Francesca Meneghello, Cristina Pilosio, Jessica Rigon, Annalena Venneri
BACKGROUND: Previous work designed a network-based protocol of cognitive training. This programme exploits a mechanism of induced task-oriented co-activation of multiple regions that are part of the default mode network (DMN), to induce functional rewiring and increased functional connectivity within this network. OBJECTIVE: In this study, the programme was administered to patients with a diagnosis of mild cognitive impairment to test its effects in a clinical sample...
December 11, 2017: Current Alzheimer Research
https://www.readbyqxmd.com/read/29230170/the-dancing-brain-structural-and-functional-signatures-of-expert-dance-training
#8
Agnieszka Z Burzynska, Karolina Finc, Brittany K Taylor, Anya M Knecht, Arthur F Kramer
Dance - as a ritual, therapy, and leisure activity - has been known for thousands of years. Today, dance is increasingly used as therapy for cognitive and neurological disorders such as dementia and Parkinson's disease. Surprisingly, the effects of dance training on the healthy young brain are not well understood despite the necessity of such information for planning successful clinical interventions. Therefore, this study examined actively performing, expert-level trained college students as a model of long-term exposure to dance training...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29229240/brain-functional-and-perfusional-alterations-in-schizophrenia-an-arterial-spin-labeling-study
#9
Ícaro A F Oliveira, Tiago M Guimarães, Roberto M Souza, Antônio C Dos Santos, João Paulo Machado-de-Sousa, Jaime E C Hallak, Renata F Leoni
Schizophrenia is a severe mental disorder that affects the anatomy and function of the brain, with an impact on one's thoughts, feelings, and behavior. The purpose of the study was to investigate cerebral blood flow (CBF) and brain connectivity in a group of patients with schizophrenia. Pseudo-continuous arterial spin labeling (pCASL) images were acquired from 28 patients in treatment and 28 age-matched healthy controls. Mean CBF and connectivity patterns were assessed. Schizophrenia patients had decreased CBF in the bilateral frontal pole and superior frontal gyrus, right medial frontal gyrus, triangular and opercular parts of the inferior frontal gyrus, posterior division of the left supramarginal gyrus, superior and inferior divisions of the left lateral occipital cortex, and bilateral occipital pole...
December 5, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/29228757/disrupted-functional-connectivity-between-perirhinal-and-parahippocampal-cortices-with-hippocampal-subfields-in-patients-with-mild-cognitive-impairment-and-alzheimer-s-disease
#10
Yu Sun, Yafei Wang, Jiaming Lu, Rengyuan Liu, Christopher G Schwarz, Hui Zhao, Yue Zhang, Lingyi Xu, Bin Zhu, Bing Zhang, Bing Liu, Suiren Wan, Yun Xu
Most patients with mild cognitive impairment and Alzheimer's disease can initially present memory loss. The medial temporal lobes are the brain regions most associated with declarative memory function. As sub-components of the MTL, the perirhinal cortex, parahippocampal cortex and hippocampus have also been identified as playing important roles in memory. The functional connectivity between hippocampus subfields and perirhnial cortices as well as parahippocampal cortices among normal cognition controls (NC group, n=33), mild cognitive impairment (MCI group, n=31) and Alzheimer's disease (AD group, n=27) was investigated in this study...
November 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/29228120/exploring-individual-brain-variability-during-development-based-on-patterns-of-maturational-coupling-of-cortical-thickness-a-longitudinal-mri-study
#11
Budhachandra S Khundrakpam, John D Lewis, Seun Jeon, Penelope Kostopoulos, Yasser Itturia Medina, François Chouinard-Decorte, Alan C Evans
Structural covariance has recently emerged as a tool to study brain connectivity in health and disease. The main assumption behind the phenomenon of structural covariance is that changes in brain structure during development occur in a coordinated fashion. However, no study has yet explored the correlation of structural brain changes within individuals across development. Here, we used longitudinal magnetic resonance imaging scans from 141 normally developing children and adolescents (scanned 3 times) to introduce a novel subject-based maturational coupling approach...
December 8, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29228119/rostro-caudal-connectional-heterogeneity-of-the-dorsal-part-of-the-macaque-prefrontal-area-46
#12
Elena Borra, Carolina Giulia Ferroni, Marzio Gerbella, Valentina Giorgetti, Chiara Mangiaracina, Stefano Rozzi, Giuseppe Luppino
Based on neural tracer injections we found evidence for 3 connectionally distinct sectors of the dorsal part of the macaque prefrontal area 46 (46d), located at different rostro-caudal levels. Specifically, a rostral sector displayed an almost exclusive and extensive intraprefrontal connectivity and extraprefrontal connections limited to superior temporal areas and the caudal cingulate area 31. Conversely, both a middle and a caudal sector were characterized by robust, topographically organized connections with parietal and frontal sensorimotor areas...
December 8, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29227583/single-point-mutation-on-the-gene-encoding-dysbindin-results-in-recognition-deficits
#13
Eric H Chang, Kayla Fernando, Lok Wan E Yeung, Kristina Barbari, Toni-Shay S Chandon, Anil K Malhotra
The dystrobrevin-binding protein 1 (DTNBP1) gene is a candidate risk factor for schizophrenia and has been associated with cognitive ability in both patient populations and healthy controls. DTNBP1 encodes dysbindin protein, which is localized to synaptic sites and is reduced in the prefrontal cortex and hippocampus of patients with schizophrenia, indicating a potential role in schizophrenia etiology. Most studies of dysbindin function have focused on the sandy (sdy) mice that lack dysbindin protein and have a wide range of abnormalities...
December 11, 2017: Genes, Brain, and Behavior
https://www.readbyqxmd.com/read/29226069/do-older-adults-need-sleep-a-review-of-neuroimaging-sleep-and-aging-studies
#14
Michael K Scullin
Purpose of Review: Sleep habits, sleep physiology, and sleep disorders change with increasing age. However, there is a longstanding debate regarding whether older adults need sleep to maintain health and daily functioning (reduced-sleep-need view). An alternative possibility is that all older adults need sleep, but that many older adults have lost the ability to obtain restorative sleep (reduced-sleep-ability view). Prior research using behavioral and polysomnography outcomes has not definitively disentangled the reduced-sleep-need and reduced-sleep-ability views...
September 2017: Current Sleep Medicine Reports
https://www.readbyqxmd.com/read/29223740/statistical-models-for-brain-signals-with-properties-that-evolve-across-trials
#15
REVIEW
Hernando Ombao, Mark Fiecas, Chee-Ming Ting, Yin Fen Low
Most neuroscience cognitive experiments involve repeated presentations of various stimuli across several minutes or a few hours. It has been observed that brain responses, even to the same stimulus, evolve over the course of the experiment. These changes in brain activation and connectivity are believed to be associated with learning and/or habituation. In this paper, we present two general approaches to modeling dynamic brain connectivity using electroencephalograms (EEGs) recorded across replicated trials in an experiment...
December 6, 2017: NeuroImage
https://www.readbyqxmd.com/read/29223681/language-processing-in-age-related-macular-degeneration-associated-with-unique-functional-connectivity-signatures-in-the-right-hemisphere
#16
Jie Zhuang, David J Madden, Xuan Duong-Fernandez, Nan-Kuei Chen, Scott W Cousins, Guy G Potter, Michele T Diaz, Heather E Whitson
Age-related macular degeneration (AMD) is a retinal disease associated with significant vision loss among older adults. Previous large-scale behavioral studies indicate that people with AMD are at increased risk of cognitive deficits in language processing, particularly in verbal fluency tasks. The neural underpinnings of any relationship between AMD and higher cognitive functions, such as language processing, remain unclear. This study aims to address this issue using independent component analysis of spontaneous brain activity at rest...
November 14, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/29223425/assessing-age-dependent-multi-task-functional-co-activation-changes-using-measures-of-task-potency
#17
Roselyne J Chauvin, Maarten Mennes, Jan K Buitelaar, Christian F Beckmann
It is being hypothesised that the developing adolescent brain is increasingly enlisting long-range connectivity, allowing improved communication between spatially distant brain regions. The developmental trajectories of such maturational changes remain elusive. Here, we aim to study how the brain engages in multiple tasks (working memory, reward processing, and inhibition) at the network-level and evaluate how effects of age across these tasks are related to each other. We characterise how the brain departs from its functional baseline architecture towards task-induced functional connectivity modulations using a novel measure called task potency, allowing direct comparison between tasks by defining sensitivity to one or multiple tasks...
December 5, 2017: Developmental Cognitive Neuroscience
https://www.readbyqxmd.com/read/29222818/task-related-effective-connectivity-reveals-that-the-cortical-rich-club-gates-cortex-wide-communication
#18
Mario Senden, Niels Reuter, Martijn P van den Heuvel, Rainer Goebel, Gustavo Deco, Matthieu Gilson
Higher cognition may require the globally coordinated integration of specialized brain regions into functional networks. A collection of structural cortical hubs-referred to as the rich club-has been hypothesized to support task-specific functional integration. In the present paper, we use a whole-cortex model to estimate directed interactions between 68 cortical regions from functional magnetic resonance imaging activity for four different tasks (reflecting different cognitive domains) and resting state. We analyze the state-dependent input and output effective connectivity (EC) of the structural rich club and relate these to whole-cortex dynamics and network reconfigurations...
December 8, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/29218005/distributed-neural-activity-patterns-during-human-to-human-competition
#19
Matthew Piva, Xian Zhang, J Adam Noah, Steve W C Chang, Joy Hirsch
Interpersonal interaction is the essence of human social behavior. However, conventional neuroimaging techniques have tended to focus on social cognition in single individuals rather than on dyads or groups. As a result, relatively little is understood about the neural events that underlie face-to-face interaction. We resolved some of the technical obstacles inherent in studying interaction using a novel imaging modality and aimed to identify neural mechanisms engaged both within and across brains in an ecologically valid instance of interpersonal competition...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29216478/reach-and-grasp-deficits-following-damage-to-the-dorsal-pulvinar
#20
Melanie Wilke, Lukas Schneider, Adan-Ulises Dominguez-Vargas, Carsten Schmidt-Samoa, Kristina Miloserdov, Ahmad Nazzal, Peter Dechent, Yuranny Cabral-Calderin, Hansjörg Scherberger, Igor Kagan, Mathias Bähr
Expansion of the dorsal pulvinar in humans and its anatomical connectivity suggests its involvement in higher-order cognitive and visuomotor functions. We investigated visuomotor performance in a 31 year old patient (M.B.) with a lesion centered on the medial portion of the dorsal pulvinar (left > right) due to an atypical Sarcoidosis manifestation. Unlike lesions with a vascular etiology, the lesion of M.B. did not include primary sensory or motor thalamic nuclei. Thus, this patient gave us the exceedingly rare opportunity to study the contribution of the dorsal pulvinar to visuomotor behavior in a human without confounding losses in primary sensory or motor domains...
November 8, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
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