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Inferior parietal lobule

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https://www.readbyqxmd.com/read/29429985/posterior-associative-and-cingulate-cortex-involvement-of-brain-single-photon-emission-computed-tomography-spect-imaging-in-semantic-dementia-with-probable-alzheimer-disease-pathology-a-case-report
#1
Yumi Takano, Keiko Kunitoki, Yasuko Tatewaki, Tatsushi Mutoh, Tomoko Totsune, Hideo Shimomura, Manabu Nakagawa, Hiroyuki Arai, Yasuyuki Taki
BACKGROUND Semantic dementia (SD) is a type of primary progressive aphasia with prominent language dysfunction, mostly within the spectrum of frontotemporal lobar degeneration (FTLD). Although there is an overlap in clinical manifestations of SD attributable to FTLD and neuropathologically proven Alzheimer disease (AD), clinical diagnostic clues are not readily available. We present a characteristic finding based on a single-photon emission computed tomography (SPECT)-based regional cerebral blood flow study and its statistical imaging analysis for a rare case of SD with AD-like pathology...
February 12, 2018: American Journal of Case Reports
https://www.readbyqxmd.com/read/29422882/disrupted-brain-intrinsic-networks-and-executive-dysfunction-in-cirrhotic-patients-without-overt-hepatic-encephalopathy
#2
Zhe-Ting Yang, Hua-Jun Chen, Qiu-Feng Chen, Hailong Lin
Objective: Patients with cirrhosis often exhibit cognitive deficits, particularly executive dysfunction, which is considered a predictor of overt hepatic encephalopathy (OHE). We examined brain intrinsic networks associated with executive function to investigate the neural basis of this cognitive deficiency in cirrhosis. Methods: Resting-state functional MRI data were acquired from 20 cirrhotic patients and 18 healthy controls. Seed-based correlation analysis was used to identify the three well-known networks associated with executive function, including executive control (ECN), default mode (DMN), and salience (SN) networks...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29420750/self-face-recognition-begins-to-share-active-region-in-right-inferior-parietal-lobule-with-proprioceptive-illusion-during-adolescence
#3
Tomoyo Morita, Daisuke N Saito, Midori Ban, Koji Shimada, Yuko Okamoto, Hirotaka Kosaka, Hidehiko Okazawa, Minoru Asada, Eiichi Naito
We recently reported that right-side dominance of the inferior parietal lobule (IPL) in self-body recognition (proprioceptive illusion) task emerges during adolescence in typical human development. Here, we extend this finding by demonstrating that functional lateralization to the right IPL also develops during adolescence in another self-body (specifically a self-face) recognition task. We collected functional magnetic resonance imaging (fMRI) data from 60 right-handed healthy children (8-11 years), adolescents (12-15 years), and adults (18-23 years; 20 per group) while they judged whether a presented face was their own (Self) or that of somebody else (Other)...
February 6, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29417490/motor-and-extra-motor-gray-matter-integrity-may-underlie-neurophysiologic-parameters-of-motor-function-in-amyotrophic-lateral-sclerosis-a-combined-voxel-based-morphometry-and-transcranial-stimulation-study
#4
Foteini Christidi, Efstratios Karavasilis, Georgios Velonakis, Michail Rentzos, Thomas Zambelis, Vasiliki Zouvelou, Sophia Xirou, Panagiotis Ferentinos, Efstathios Efstathopoulos, Nikolaos Kelekis, Ioannis Evdokimidis, Nikolaos Karandreas
The association between gray matter (GM) density and neurophysiologic changes is still unclear in amyotrophic lateral sclerosis (ALS). We evaluated the relationship between GM density and motor system integrity combining voxel-based morphometry (VBM) and transcranial magnetic stimulation (TMS) in ALS. We included 17 ALS patients and 22 healthy controls (HC) who underwent 3D-T1-weighted imaging. Among the ALS group, we applied left motor cortex single-pulse TMS. We used whole-brain VBM comparing ALS and HC in GM density...
February 7, 2018: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/29416508/the-default-mode-network-supports-episodic-memory-in-cognitively-unimpaired-elderly-individuals-different-contributions-to-immediate-recall-and-delayed-recall
#5
Lijuan Huo, Rui Li, Pengyun Wang, Zhiwei Zheng, Juan Li
While the neural correlates of age-related decline in episodic memory have been the subject of much interest, the spontaneous functional architecture of the brain for various memory processes in elderly adults, such as immediate recall (IR) and delayed recall (DR), remains unclear. The present study thus examined the neural correlates of age-related decline of various memory processes. A total of 66 cognitively normal older adults (aged 60-80 years) participated in this study. Memory processes were measured using the Auditory Verbal Learning Test as well as resting-state brain images, which were analyzed using both regional homogeneity (ReHo) and correlation-based functional connectivity (FC) approaches...
2018: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/29413534/income-change-alters-default-mode-network-connectivity-for-adolescents-in-poverty
#6
David G Weissman, Rand D Conger, Richard W Robins, Paul D Hastings, Amanda E Guyer
Experiencing poverty during childhood and adolescence may affect brain function. However, income is dynamic, and studies have not addressed whether income change relates to brain function. In the present study, we investigated whether intrinsic functional connectivity of default mode network (DMN) regions was influenced by mean family income and family income change. Parents of 68 Mexican-origin adolescents (35 females) reported family income annually when adolescents were 10-16 years old. Intercept and slope of income at each of these ages were calculated for each participant...
January 30, 2018: Developmental Cognitive Neuroscience
https://www.readbyqxmd.com/read/29410219/dopaminergic-modulation-of-hemodynamic-signal-variability-and-the-functional-connectome-during-cognitive-performance
#7
Mohsen Alavash, Sung-Joo Lim, Christiane Thiel, Bernhard Sehm, Lorenz Deserno, Jonas Obleser
Dopamine underlies important aspects of cognition, and has been suggested to boost cognitive performance. However, how dopamine modulates the large-scale cortical dynamics during cognitive performance has remained elusive. Using functional MRI during a working memory task in healthy young human listeners, we investigated the effect of levodopa (l-dopa) on two aspects of cortical dynamics, blood oxygen-level-dependent (BOLD) signal variability and the functional connectome of large-scale cortical networks. We here show that enhanced dopaminergic signaling modulates the two potentially interrelated aspects of large-scale cortical dynamics during cognitive performance, and the degree of these modulations is able to explain inter-individual differences in l-dopa-induced behavioral benefits...
February 2, 2018: NeuroImage
https://www.readbyqxmd.com/read/29386913/altered-low-frequency-oscillation-amplitude-of-resting-state-fmri-in-patients-with-discogenic-low-back-and-leg-pain
#8
Fuqing Zhou, Lili Gu, Shunda Hong, Jiaqi Liu, Jian Jiang, Muhua Huang, Yong Zhang, Honghan Gong
Objective: The aim of this study was to explore the amplitude of intrinsic low-frequency oscillations (LFOs) in patients with discogenic low-back and leg pain (LBLP). Participants and methods: We obtained and compared the LFO amplitude from 25 right-handed discogenic LBLP patients (13 males; mean age 55.16±1.83 years) and 27 well-matched healthy controls (15 males; mean age 52.96±1.63 years). The LFO amplitude was examined using the voxel-wise amplitude of low-frequency fluctuations (ALFFs), and partial correlation analysis was performed to determine the relationship between the regions with altered ALFF values and clinical parameters in discogenic LBLP patients...
2018: Journal of Pain Research
https://www.readbyqxmd.com/read/29376200/intrinsic-stimulus-driven-and-task-dependent-connectivity-in-human-auditory-cortex
#9
Suvi Häkkinen, Teemu Rinne
A hierarchical and modular organization is a central hypothesis in the current primate model of auditory cortex (AC) but lacks validation in humans. Here we investigated whether fMRI connectivity at rest and during active tasks is informative of the functional organization of human AC. Identical pitch-varying sounds were presented during a visual discrimination (i.e. no directed auditory attention), pitch discrimination, and two versions of pitch n-back memory tasks. Analysis based on fMRI connectivity at rest revealed a network structure consisting of six modules in supratemporal plane (STP), temporal lobe, and inferior parietal lobule (IPL) in both hemispheres...
January 29, 2018: Brain Structure & Function
https://www.readbyqxmd.com/read/29374914/-regional-homogeneity-in-the-patients-of-irritable-bowel-syndrome-complicated-with-depression-a-resting-state-functional-magnetic-resonance-imaging-study
#10
J Li, G X Li, Y Guo, X Q Lu, L Li, J P Ding
Objective: To explore the changes of the brain regional homogeneity (ReHo) in the patients of irritable bowel syndrome (IBS) complicated with depression by using resting-state functional magnetic resonance imaging (rs-fMRI) and to investigate the relation between abnormal brain function and depression in those patients. Methods: A total of 35 patients with IBS were included in this study, collected in Gastroenterology Department of Affiliated Hospital of Hangzhou Normal University from June 2015 to June 2017...
January 16, 2018: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29367059/precuneus-related-regional-and-network-functional-deficits-in-social-anxiety-disorder-a-resting-state-functional-mri-study
#11
Cui Yuan, Hongru Zhu, Zhengjia Ren, Minlan Yuan, Meng Gao, Yan Zhang, Yuchen Li, Yajing Meng, Qiyong Gong, Su Lui, Changjian Qiu, Wei Zhang
BACKGROUND: Neuroimaging findings suggest that social anxiety disorder (SAD) may be correlated with changes in regional- or network-level brain function. However, few studies have explored alterations in intrinsic resting cerebral function in patients with SAD at both the regional and network levels, particularly focusing on the theory of mind (ToM)-related regions. This study was performed to investigate changes in neural activity and functional connectivity (FC) in ToM-related regions during the resting state in SAD patients and to determine how these alterations are correlated with the clinical symptoms of SAD...
December 22, 2017: Comprehensive Psychiatry
https://www.readbyqxmd.com/read/29364069/the-signature-of-undetected-change-an-exploratory-electrotomographic-investigation-of-gradual-change-blindness
#12
John Emmanuel Kiat, Michael D Dodd, Robert F Belli, Jacob E Cheadle
Neuroimaging based investigations of change blindness, a phenomenon in which seemingly obvious changes in visual scenes fail to be detected, have significantly advanced our understanding of visual awareness. The vast majority of prior investigations, however, utilize paradigms involving visual disruptions (e.g. intervening blank screens, saccadic movements, "mudsplashes"), making it difficult to cleanly isolate neural responses towards undetected visual changes. To address this issue in this present study, high-density EEG data (256 channel) was collected from 25 participants using a paradigm in which visual changes were progressively introduced into detailed real-world scenes without the use of visual disruption...
January 24, 2018: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29359833/functional-connectivity-maps-based-on-hippocampal-and-thalamic-dynamics-may-account-for-the-default-mode-network
#13
Tien-Wen Lee, Shao-Wei Xue
The default-mode network (DMN) has been reported to comprise a set of inter-connected transmodal cortical areas, including the posterior cingulate cortex (PCC), medial prefrontal cortex, posterior inferior parietal lobule, lateral temporal region, and others. However, the subcortical constituents of the DMN are still not clear. This study aimed to examine whether the correlation maps derived from subcortical structures may also account for neural pattern of the DMN. Structural magnetic resonance imaging (MRI) and resting state functional MRI scans of 36 subjects were selected from the Rockland sample (Nathan Kline Institute)...
January 23, 2018: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29355798/awake-surgery-for-gliomas-within-the-right-inferior-parietal-lobule-new-insights-into-the-functional-connectivity-gained-from-stimulation-mapping-and-surgical-implications
#14
Alice Rolland, Guillaume Herbet, Hugues Duffau
OBJECTIVE: Little is known about the functional role of the white matter connections running within and around the right inferior parietal lobule (IPL). We used direct electrostimulation during awake surgery to investigate this connectivity and to avoid permanent deficit following resection for right IPL gliomas. METHODS: We reviewed patients who underwent awake mapping for a glioma involving the right IPL. Resection was achieved up to functional cortico-subcortical boundaries detected by electrostimulation...
January 16, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29349781/mirror-neurons-and-intention-understanding-dissociating-the-contribution-of-object-type-and-intention-to-mirror-responses-using-electromyography
#15
Maura Ruggiero, Caroline Catmur
Since their discovery in the monkey and human brain, mirror neurons have been claimed to play a key role in understanding others' intentions. For example, "action-constrained" mirror neurons in inferior parietal lobule fire when the monkey observes a grasping movement that is followed by an eating action, but not when it is followed by a placing action. It is claimed these responses enable the monkey to predict the intentions of the actor. These findings have been replicated in human observers by recording electromyography responses of the mouth-opening mylohyoid muscle during action observation...
January 18, 2018: Psychophysiology
https://www.readbyqxmd.com/read/29339077/how-context-features-modulate-the-involvement-of-the-working-memory-system-during-discourse-comprehension
#16
Xiaohong Yang, Xiuping Zhang, Yufang Yang, Nan Lin
Using functional magnetic resonance imaging (fMRI), we investigated the effects of context features on the involvement of the working memory (WM) system during discourse comprehension. During the fMRI scan, participants were asked to read two-sentence discourses in which the topic of the second sentence was either maintained, or was shifted from, the topic of the first. Changes in the level of coherence between the two sentences as well as context length were also investigated across discourse items. The WM system was identified with a verbal N-back task...
January 12, 2018: Neuropsychologia
https://www.readbyqxmd.com/read/29339004/differential-activation-of-brain-areas-in-children-with-developmental-coordination-disorder-during-tasks-of-manual-dexterity-an-ale-meta-analysis
#17
REVIEW
I Fuelscher, K Caeyenberghs, P G Enticott, J Williams, J Lum, C Hyde
Recent neuroimaging studies have reported atypical neural activation in children with Developmental Coordination Disorder (DCD) during tasks assessing manual dexterity. However, small sample sizes and subtle differences in task parameters have led to inconsistent findings, rendering interpretation difficult. The aim of the present meta-analysis was to quantitatively summarize this body of evidence using activation likelihood estimation (ALE) analysis to identify reliable regions of differential neural activation in children with DCD, compared to age-matched controls...
January 12, 2018: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/29322527/thalamo-cortical-projections-to-the-macaque-superior-parietal-lobule-areas-pec-and-pe
#18
Daniele Impieri, Michela Gamberini, Lauretta Passarelli, Marcello G P Rosa, Claudio Galletti
The exposed surface of the superior parietal lobule in macaque brain contains two architectonically defined areas named PEc and PE. The aim of the present study is the characterization of thalamic afferents of these two areas. For this purpose, retrograde neuronal tracers were injected, or placed in crystal form, in areas PEc and PE. We found that the two areas show a similar pattern of thalamic inputs, mainly originating from Lateral Posterior (LP), Pulvinar (Pul), Ventral Posterior Lateral (VPL), and Ventral Lateral (VL) nuclei, all structures known to be involved in visual, somatosensory, and/or sensorimotor processing...
January 10, 2018: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/29304050/severe-hyposmia-and-aberrant-functional-connectivity-in-cognitively-normal-parkinson-s-disease
#19
Noritaka Yoneyama, Hirohisa Watanabe, Kazuya Kawabata, Epifanio Bagarinao, Kazuhiro Hara, Takashi Tsuboi, Yasuhiro Tanaka, Reiko Ohdake, Kazunori Imai, Michihito Masuda, Tatsuya Hattori, Mizuki Ito, Naoki Atsuta, Tomohiko Nakamura, Masaaki Hirayama, Satoshi Maesawa, Masahisa Katsuno, Gen Sobue
OBJECTIVE: Severe hyposmia is a risk factor of dementia in Parkinson's disease (PD), while the underlying functional connectivity (FC) and brain volume alterations in PD patients with severe hyposmia (PD-SH) are unclear. METHODS: We examined voxel-based morphometric and resting state functional magnetic resonance imaging findings in 15 cognitively normal PD-SH, 15 cognitively normal patients with PD with no/mild hyposmia (PD-N/MH), and 15 healthy controls (HCs)...
2018: PloS One
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
#20
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
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