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Occipital lobe function

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https://www.readbyqxmd.com/read/29325327/-resting-state-network-evaluation-of-chronic-smokers-by-functional-magnetic-resonance-imaging
#1
Y Zhang, Y L Li, J L Cheng, A K Dong, K Xu, Y L Li
Objective: To explore the neuromechanism of nicotine smoking, we use independent component analysis (ICA) of resting-state functional magnetic resonance imaging (fMRI) to investigate the differences of functional connectivity of resting-state networks (RSN) in chronic smokers. Methods: Forty-five chronic smokers and thirty-four age and gender matched normal nonsmoking controls experienced resting-state fMRI scanning in 3.0T MRI scanner.Differences of the function connection in each RSN between chronic smokers group and nonsmoking controls group were analyzed by SPM software which was based on Matlab platform...
December 19, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29322583/motor-imagery-training-kinesthetic-imagery-strategy-and-inferior-parietal-fmri-activation
#2
Florent Lebon, Ulrike Horn, Martin Domin, Martin Lotze
Motor imagery (MI) is the mental simulation of action frequently used by professionals in different fields. However, with respect to performance, well-controlled functional imaging studies on MI training are sparse. We investigated changes in fMRI representation going along with performance changes of a finger sequence (error and velocity) after MI training in 48 healthy young volunteers. Before training, we tested the vividness of kinesthetic and visual imagery. During tests, participants were instructed to move or to imagine moving the fingers of the right hand in a specific order...
January 10, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29315951/four-way-multimodal-fusion-of-7%C3%A2-t-imaging-data-using-an-mcca-jica-model-in-first-episode-schizophrenia
#3
Kristin K Lottman, David M White, Nina V Kraguljac, Meredith A Reid, Vince D Calhoun, Fabio Catao, Adrienne C Lahti
Acquisition of multimodal brain imaging data for the same subject has become more common leading to a growing interest in determining the intermodal relationships between imaging modalities to further elucidate the pathophysiology of schizophrenia. Multimodal data have previously been individually analyzed and subsequently integrated; however, these analysis techniques lack the ability to examine true modality inter-relationships. The utilization of a multiset canonical correlation and joint independent component analysis (mCCA + jICA) model for data fusion allows shared or distinct abnormalities between modalities to be examined...
January 9, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29310446/resting-state-fmri-in-primary-sj%C3%A3-gren-syndrome
#4
Wu Xing, Wei Shi, Yueshuang Leng, Xianting Sun, Tingting Guan, Weihua Liao, Xiaoyi Wang
Background The involvement of the central nervous system in primary Sjögren syndrome (pSS) remains controversial. Functional magnetic resonance imaging (fMRI) is a relatively new method that can be applied to investigate the heterogeneity of central nervous system (CNS) involvement in pSS patients through regional homogeneity (ReHo) analysis. Purpose To collect data from pSS patients and healthy controls, and use ReHo analysis to elucidate the neurobiological mechanism of CNS involvement in pSS. Material and Methods Fourteen clinically diagnosed pSS patients and 14 age- and gender-matched healthy controls underwent resting-state fMRI...
January 1, 2018: Acta Radiologica
https://www.readbyqxmd.com/read/29298164/neural-activity-during-mental-rotation-in-deaf-signers-the-influence-of-long-term-sign-language-experience
#5
Hong-Bo Le, Hui-Hong Zhang, Qiu-Lin Wu, Jiong Zhang, Jing-Jing Yin, Shu-Hua Ma
OBJECTIVES: Mental rotation is the brain's visuospatial understanding of what objects are and where they belong. Previous research indicated that deaf signers showed behavioral enhancement for nonlinguistic visual tasks, including mental rotation. In this study, we investigated the neural difference of mental rotation processing between deaf signers and hearing nonsigners using blood oxygen level-dependent (BOLD) functional magnetic resonance imaging (fMRI). DESIGN: The participants performed a block-designed experiment, consisting of alternating blocks of comparison and rotation periods, separated by a baseline or fixation period...
January 2, 2018: Ear and Hearing
https://www.readbyqxmd.com/read/29295991/network-connectivity-determines-cortical-thinning-in-early-parkinson-s-disease-progression
#6
Y Yau, Y Zeighami, T E Baker, K Larcher, U Vainik, M Dadar, V S Fonov, P Hagmann, A Griffa, B Mišić, D L Collins, A Dagher
Here we test the hypothesis that the neurodegenerative process in Parkinson's disease (PD) moves stereotypically along neural networks, possibly reflecting the spread of toxic alpha-synuclein molecules. PD patients (n = 105) and matched controls (n = 57) underwent T1-MRI at entry and 1 year later as part of the Parkinson's Progression Markers Initiative. Over this period, PD patients demonstrate significantly greater cortical thinning than controls in parts of the left occipital and bilateral frontal lobes and right somatomotor-sensory cortex...
January 2, 2018: Nature Communications
https://www.readbyqxmd.com/read/29287243/individual-variation-in-the-propensity-for-prospective-thought-is-associated-with-functional-integration-between-visual-and-retrosplenial-cortex
#7
Mario Villena-Gonzalez, Hao-Ting Wang, Mladen Sormaz, Giovanna Mollo, Daniel S Margulies, Elizabeth A Jefferies, Jonathan Smallwood
It is well recognized that the default mode network (DMN) is involved in states of imagination, although the cognitive processes that this association reflects are not well understood. The DMN includes many regions that function as cortical "hubs", including the posterior cingulate/retrosplenial cortex, anterior temporal lobe and the hippocampus. This suggests that the role of the DMN in cognition may reflect a process of cortical integration. In the current study we tested whether functional connectivity from uni-modal regions of cortex into the DMN is linked to features of imaginative thought...
December 5, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29285657/inter-individual-variations-and-hemispheric-asymmetries-in-structural-connectivity-patterns-of-the-inferior-fronto-occipital-fascicle-a-diffusion-tensor-imaging-tractography-study
#8
François Vassal, Benjamin Pommier, Anna Sontheimer, Jean-Jacques Lemaire
PURPOSE: Precise knowledge of the structural connectivity of white matter fascicles could yield new insights into function and is important for neurosurgical planning. Therefore, we aimed to provide a detailed map of the cortical terminations of the inferior fronto-occipital fascicle (IFOF), with special emphasis on putative inter-individual variations and hemispheric asymmetries. METHODS: Deterministic diffusion tensor imaging-based tractography was used to perform virtual dissection of the IFOF in 20 healthy subjects...
December 28, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/29247551/occipital-blood-brain-barrier-permeability-is-an-independent-predictor-of-visual-outcome-in-type-2-diabetics-irrespective-of-the-retinal-barrier-a-longitudinal-study
#9
Sulaiman I Abuhaiba, Miguel Cordeiro, Andre Amorim, Ângela Cruz, Bruno Quendera, Carlos Ferreira, Luisa Ribeiro, Rui Bernardes, Miguel Castelo-Branco
Blood brain barrier permeability in type 2 diabetic patients has been previously shown to be altered in certain brain regions such as the basal ganglia and the hippocampus. Because of the histological and functional similarities between the blood-brain-barrier (BBB) and the blood-retinal-barrier (BRB) we aimed to investigate how the permeability of both barriers predicts visual outcome. We included two control groups (Acute unilateral stroke patients n=9, and type 2 diabetics without BRB leakage n=10) and a case study group of type 2 diabetics with established BRB leakage (n=17)...
December 16, 2017: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/29247375/a-novel-mutation-in-lamc3-associated-with-generalized-polymicrogyria-of-the-cortex-and-epilepsy
#10
J L Zambonin, D A Dyment, Y Xi, R E Lamont, T Hartley, E Miller, M Kerr, K M Boycott, J S Parboosingh, S Venkateswaran
Occipital cortical malformation is a rare neurodevelopmental disorder characterized by pachygyria and polymicrogyria of the occipital lobes as well as global developmental delays and seizures. This condition is due to biallelic, loss-of-function mutations in LAMC3 and has been reported in four unrelated families to date. We report an individual with global delays, seizures, and polymicrogyria that extends beyond the occipital lobes and includes the frontal, parietal, temporal, and occipital lobes. Next-generation sequencing identified a homozygous nonsense mutation in LAMC3: c...
December 15, 2017: Neurogenetics
https://www.readbyqxmd.com/read/29242103/the-neural-network-for-face-recognition-insights-from-an-fmri-study-on-developmental-prosopagnosia
#11
Yuanfang Zhao, Zonglei Zhen, Xiqin Liu, Yiying Song, Jia Liu
Face recognition is supported by collaborative work of multiple face-responsive regions in the brain. Based on findings from individuals with normal face recognition ability, a neural model has been proposed with the occipital face area (OFA), fusiform face area (FFA), and face-selective posterior superior temporal sulcus (pSTS) as the core face network (CFN) and the rest of the face-responsive regions as the extended face network (EFN). However, little is known about how these regions work collaboratively for face recognition in our daily life...
December 11, 2017: NeuroImage
https://www.readbyqxmd.com/read/29219756/awake-perimetry-testing-for-occipital-epilepsy-surgery
#12
Holger Joswig, John P Girvin, Warren T Blume, Jorge G Burneo, David A Steven
In the literature, there are few reports that provide a detailed account on the technique of visual electrocortical stimulation in the setting of resective surgery for occipital epilepsy. In this technical note, the authors describe how a 26-year-old male with long-standing occipital epilepsy underwent resective surgery under awake conditions, using electrocortical stimulation of the occipital lobe, with the aid of a laser pointer and a perimetry chart on a stand within his visual field. The eloquent primary visual cortex was found to overlap with the seizure onset zone that was previously determined with subdural electrodes...
December 8, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29213509/comparative-analysis-of-the-electroencephalogram-in-patients-with-alzheimer-s-disease-diffuse-axonal-injury-patients-and-healthy-controls-using-loreta-analysis
#13
Jéssica Natuline Ianof, Francisco José Fraga, Leonardo Alves Ferreira, Renato Teodoro Ramos, José Luiz Carlos Demario, Regina Baratho, Luís Fernando Hindi Basile, Ricardo Nitrini, Renato Anghinah
Alzheimer's disease (AD) is a dementia that affects a large contingent of the elderly population characterized by the presence of neurofibrillary tangles and senile plaques. Traumatic brain injury (TBI) is a non-degenerative injury caused by an external mechanical force. One of the main causes of TBI is diffuse axonal injury (DAI), promoted by acceleration-deceleration mechanisms. Objective: To understand the electroencephalographic differences in functional mechanisms between AD and DAI groups...
April 2017: Dementia & Neuropsychologia
https://www.readbyqxmd.com/read/29209199/decreased-complexity-in-alzheimer-s-disease-resting-state-fmri-evidence-of-brain-entropy-mapping
#14
Bin Wang, Yan Niu, Liwen Miao, Rui Cao, Pengfei Yan, Hao Guo, Dandan Li, Yuxiang Guo, Tianyi Yan, Jinglong Wu, Jie Xiang, Hui Zhang
Alzheimer's disease (AD) is a frequently observed, irreversible brain function disorder among elderly individuals. Resting-state functional magnetic resonance imaging (rs-fMRI) has been introduced as an alternative approach to assessing brain functional abnormalities in AD patients. However, alterations in the brain rs-fMRI signal complexities in mild cognitive impairment (MCI) and AD patients remain unclear. Here, we described the novel application of permutation entropy (PE) to investigate the abnormal complexity of rs-fMRI signals in MCI and AD patients...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/29204343/episodic-memory-after-trauma-exposure-medial-temporal-lobe-function-is-positively-related-to-re-experiencing-and-inversely-related-to-negative-affect-symptoms
#15
Jennifer S Stevens, Renuka Reddy, Ye Ji Kim, Sanne J H van Rooij, Timothy D Ely, Stephan Hamann, Kerry J Ressler, Tanja Jovanovic
Hippocampal structure is particularly sensitive to trauma and other stressors. However, previous findings linking hippocampal function with trauma-related psychopathology have been mixed. Heterogeneity in psychological responses to trauma has not been considered with respect to hippocampal function and may contribute to mixed findings. To address these issues, we examined associations between data-driven symptom dimensions and episodic memory formation, a key function of the hippocampus, in a trauma-exposed sample...
2018: NeuroImage: Clinical
https://www.readbyqxmd.com/read/29201866/getting-lost-behavior-in-patients-with-mild-alzheimer-s-disease-a-cognitive-and-anatomical-model
#16
Chathuri Yatawara, Daryl Renick Lee, Levinia Lim, Juan Zhou, Nagaendran Kandiah
Background: Getting lost behavior (GLB) in the elderly is believed to involve poor top-down modulation of visuospatial processing, by impaired executive functions. However, since healthy elderly and elderly with Alzheimer's disease (AD) experience a different pattern of cognitive decline, it remains unclear whether this hypothesis can explain GLB in dementia. Objective: We sought to identify whether poor executive functions and working memory modulate the relationship between visuospatial processing and prevalence of GLB in healthy elderly and patients with AD...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/29200859/abnormal-regional-spontaneous-neural-activity-in-visual-pathway-in-retinal-detachment-patients-a-resting-state-functional-mri-study
#17
Xin Huang, Dan Li, Hai-Jun Li, Yu-Lin Zhong, Shelby Freeberg, Jing Bao, Xian-Jun Zeng, Yi Shao
Objective: The aim of the study was to investigate changes of brain neural homogeneity in retinal detachment (RD) patients using the regional homogeneity (ReHo) method to understand their relationships with clinical features. Materials and methods: A total of 30 patients with RD (16 men and 14 women), and 30 healthy controls (HCs) (16 men and 14 women) closely matched in age and sex were recruited. Resting-state functional magnetic resonance imaging scans were performed for all subjects...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/29170933/impact-of-previous-episodes-of-hepatic-encephalopathy-on-short-term-brain-function-recovery-after-liver-transplantation-a-functional-connectivity-strength-study
#18
Yue Cheng, Gaoyan Zhang, Wen Shen, Li-Xiang Huang, Li Zhang, Shuang-Shuang Xie, Xiao-Dong Zhang, Baolin Liu
Neuropsychological studies have documented an incomplete reversal of pre-existing cognitive dysfunction in cirrhotic patients after liver transplantation (LT) and have found this is more severe in patients with hepatic encephalopathy (HE). In this study, we aimed to investigate the impact of prior HE episodes on post-transplantation brain function recovery. Resting-state functional magnetic resonance imaging data was collected from 30 healthy controls and 33 cirrhotic patients (HE, n = 15 and noHE, n = 18) before and one month after LT...
November 23, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/29167833/disorder-specific-and-shared-brain-abnormalities-during-vigilance-in-autism-and-obsessive-compulsive-disorder
#19
Christina O Carlisi, Luke Norman, Clodagh M Murphy, Anastasia Christakou, Kaylita Chantiluke, Vincent Giampietro, Andrew Simmons, Michael Brammer, Declan G Murphy, David Mataix-Cols, Katya Rubia
Background: Autism spectrum disorder (ASD) and obsessive-compulsive disorder (OCD) are often comorbid and share similarities across some cognitive phenotypes, including certain aspects of attention. However, no functional magnetic resonance imaging studies have compared the underlying neural mechanisms contributing to these shared phenotypes. Methods: Age- and IQ-matched boys (11-17 years old) with ASD (n = 20), boys with OCD (n = 20), and healthy control boys (n = 20) performed a parametrically modulated psychomotor vigilance functional magnetic resonance imaging task...
November 2017: Biological Psychiatry: Cognitive Neuroscience and Neuroimaging
https://www.readbyqxmd.com/read/29164280/functional-brain-networks-involved-in-decision-making-under-certain-and-uncertain-conditions
#20
Danielle C Farrar, Asim Z Mian, Andrew E Budson, Mark B Moss, Ronald J Killiany
PURPOSE: The aim of this study was to describe imaging markers of decision-making under uncertain conditions in normal individuals, in order to provide baseline activity to compare to impaired decision-making in pathological states. METHODS: In this cross-sectional study, 19 healthy subjects ages 18-35 completed a novel decision-making card-matching task using a Phillips T3 Scanner and a 32-channel head coil. Functional data were collected in six functional runs...
November 21, 2017: Neuroradiology
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