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Anterior temporal lobe

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https://www.readbyqxmd.com/read/28209314/connection-between-bilateral-temporal-regions-tractography-using-human-connectome-data-and-diffusion-spectrum-imaging
#1
Peng-Hu Wei, Zhi-Qi Mao, Fei Cong, Bo Wang, Zhi-Pei Ling, Shu-Li Liang, Xin-Guang Yu
Temporal lobe epilepsy often propagates inter-hemispherically. Although the pathway of the propagation was verified by electrophysiology, the trajectory remains poorly defined. DTI can depict fiber trajectory but it has limited angular resolution and cannot adequately assess cortical regions. We visualized potential pathways of bitemporal epilepsy propagation using diffusion spectrum imaging (DSI) with data consisting of 8 groups of 514 directions and diffusion templates of 842 subjects from the human connectome project (HCP)...
February 10, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28185963/increased-network-centrality-as-markers-of-relapse-risk-in-nicotine-dependent-individuals-treated-with-varenicline
#2
Zhujing Shen, Peiyu Huang, Chao Wang, Wei Qian, Yihong Yang, Minming Zhang
Identifying smokers at high risk of relapse could improve the effectiveness of cessation therapies. Although altered regional brain function in smokers has been reported, whether the whole-brain functional organization differs smokers with relapse vulnerability from others remains unclear. Thus, the goal of this study is to investigate the baseline functional connectivity differences between relapsers and quitters. Using resting-state fMRI, we acquired images from 57 smokers prior to quitting attempts. After 12-week treatment with varenicline, smokers were divided into relapsers (n=36) and quitters (n=21) (quitter: continuously abstinent for weeks 9-12)...
February 6, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28180076/face-name-association-task-reveals-memory-networks-in-patients-with-left-and-right-hippocampal-sclerosis
#3
Silke Klamer, Monika Milian, Michael Erb, Sabine Rona, Holger Lerche, Thomas Ethofer
We aimed to identify reorganization processes of episodic memory networks in patients with left and right temporal lobe epilepsy (TLE) due to hippocampal sclerosis as well as their relations to neuropsychological memory performance. We investigated 28 healthy subjects, 12 patients with left TLE (LTLE) and 9 patients with right TLE (RTLE) with hippocampal sclerosis by means of functional magnetic resonance imaging (fMRI) using a face-name association task, which combines verbal and non-verbal memory functions...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28170003/brain-volumetric-and-metabolic-correlates-of-electroconvulsive-therapy-for-treatment-resistant-depression-a-longitudinal-neuroimaging-study
#4
M Cano, I Martínez-Zalacaín, Á Bernabéu-Sanz, O Contreras-Rodríguez, R Hernández-Ribas, E Via, A de Arriba-Arnau, V Gálvez, M Urretavizcaya, J Pujol, J M Menchón, N Cardoner, C Soriano-Mas
Recent research suggests that neuroplastic and neuroinflammatory changes may account for the mode of action of electroconvulsive therapy (ECT), although extant data do not allow for a clear disambiguation between these two hypotheses. Multimodal neuroimaging approaches (for example, combining structural and metabolic information) may help in clarifying this issue. Here we aimed to assess longitudinal changes in (i) regional gray matter (GM) volumes and (ii) hippocampal metabolite concentrations throughout an acute course of bitemporal ECT, as well as (iii) to determine the association between imaging changes and clinical improvement...
February 7, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28159617/a-brief-comparative-review-of-primate-posterior-parietal-cortex-a-novel-hypothesis-on-the-human-toolmaker
#5
S Kastner, Q Chen, S K Jeong, R E B Mruczek
The primate visual system contains two major cortical pathways: a ventral-temporal pathway that has been associated with object processing and recognition, and a dorsal-parietal pathway that has been associated with spatial processing and action guidance. Our understanding of the role of the dorsal pathway, in particular, has greatly evolved within the framework of the two-pathway hypothesis since its original conception. Here, we present a comparative review of the primate dorsal pathway in humans and monkeys based on electrophysiological, neuroimaging, neuropsychological, and neuroanatomical studies...
January 31, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28139957/differential-effects-of-encoding-instructions-on-brain-activity-patterns-of-item-and-associative-memory
#6
Nina Becker, Grégoria Kalpouzos, Jonas Persson, Erika J Laukka, Yvonne Brehmer
Evidence from neuroimaging studies suggests a critical role of hippocampus and inferior frontal gyrus (IFG) in associative relative to item encoding. Here, we investigated similarities and differences in functional brain correlates for associative and item memory as a function of encoding instruction. Participants received either incidental (animacy judgments) or intentional encoding instructions while fMRI was employed during the encoding of associations and items. In a subsequent recognition task, memory performance of participants receiving intentional encoding instructions was higher compared with those receiving incidental encoding instructions...
March 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28138428/automated-tractography-in-patients-with-temporal-lobe-epilepsy-using-tracts-constrained-by-underlying-anatomy-tracula
#7
Barbara A K Kreilkamp, Bernd Weber, Mark P Richardson, Simon S Keller
PURPOSE: A detailed understanding of white matter tract alterations in patients with temporal lobe epilepsy (TLE) is important as it may provide useful information for likely side of seizure onset, cognitive impairment and postoperative prognosis. However, most diffusion-tensor imaging (DTI) studies have relied on manual reconstruction of tract bundles, despite the recent development of automated techniques. In the present study, we used an automated white matter tractography analysis approach to quantify temporal lobe white matter tract alterations in TLE and determine the relationships between tract alterations, the extent of hippocampal atrophy and the chronicity and severity of the disorder...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28127513/preliminary-fmri-findings-concerning-the-influence-of-5-htp-on-food-selection
#8
Stephanos Ioannou, Adrian L Williams
OBJECTIVE: This functional magnetic resonance imaging study was designed to observe how physiological brain states can alter food preferences. A primary goal was to observe food-sensitive regions and moreover examine whether 5-HTP intake would activate areas which have been associated with appetite suppression, anorexia, satiety, and weight loss. METHODS AND PROCEDURE: Fourteen healthy male and female participants took part in the study, of which half of them received the supplement 5-HTP and the rest vitamin C (control) on an empty stomach...
January 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28116563/frequency-dependent-changes-in-the-amplitude-of-low-frequency-fluctuations-in-patients-with-wilson-s-disease-a-resting-state-fmri-study
#9
Xiaopeng Hu, Siyi Chen, Chang-Bing Huang, Yinfeng Qian, Yongqiang Yu
To investigate the frequency-dependent changes in the amplitude of low-frequency fluctuations (ALFF) in patients with Wilson's disease (WD). Resting-state function magnetic resonance imaging (R-fMRI) were employed to measure the amplitude of ALFF in 28 patients with WD and 27 matched normal controls. Slow-5 (0.01-0.027 Hz) and slow-4 (0.027-0.073 Hz) frequency bands were analyzed. Apart from the observation of atrophy in the cerebellum, basal ganglia, occipital gyrus, frontal gyrus, precentral gyrus, and paracentral lobule, we also found widespread differences in ALFF of the two bands in the medial frontal gyrus, inferior temporal gyrus, insula, basal ganglia, hippocampus/parahippocampal gyrus, and thalamus bilaterally...
January 24, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/28101340/pseudo-continuous-arterial-spin-labeling-imaging-of-cerebral-blood-perfusion-asymmetry-in-drug-na%C3%A3-ve-patients-with-first-episode-major-depression
#10
Guangdong Chen, Haiman Bian, Deguo Jiang, Mingwei Cui, Shengzhang Ji, Mei Liu, Xu Lang, Chuanjun Zhuo
Many previous studies have reported that regional cerebral blood flow (rCBF) aberrations may be one of the pathological characteristics of depression and rCBF has demonstrated a certain degree of asymmetry. However, studies investigating the cerebral blood perfusion asymmetry changes of drug-naïve patients experiencing their first episode of major depression using pseudo-continuous arterial spin labeling (pCASL) are rare. Ten drug-naïve patients experiencing their first major depression episode and 15 healthy volunteers were enrolled in the current study...
December 2016: Biomedical Reports
https://www.readbyqxmd.com/read/28100028/perirhinal-cortex-involvement-in-allocentric-spatial-learning-in-the-rat-evidence-from-doubly-marked-tasks
#11
Juan M J Ramos
It has recently been suggested that the different cortices of the medial temporal lobe support a mixture of object and spatial processing functions, challenging the anterior model that emphasized a strict functional differentiation between regions. However, for some structures, the perirhinal cortex (Prh) for example, a number of studies using lesion methods have shown a profound deficit exclusively in tasks involving object learning but not allocentric spatial learning. It may be that the learning paradigms used in previous studies have not been sensitive enough to detect a possible allocentric deficit in Prh-lesioned animals...
January 18, 2017: Hippocampus
https://www.readbyqxmd.com/read/28092785/integrated-ssfp-for-functional-brain-mapping-at-7t-with-reduced-susceptibility-artifact
#12
Kaibao Sun, Rong Xue, Peng Zhang, Zhentao Zuo, Zhongwei Chen, Bo Wang, Thomas Martin, Yi Wang, Lin Chen, Sheng He, Danny J J Wang
Balanced steady-state free precession (bSSFP) offers an alternative and potentially important tool to the standard gradient-echo echo-planar imaging (GE-EPI) for functional MRI (fMRI). Both passband and transition band based bSSFP have been proposed for fMRI. The applications of these methods, however, are limited by banding artifacts due to the sensitivity of bSSFP signal to off-resonance effects. In this article, a unique case of the SSFP-FID sequence, termed integrated-SSFP or iSSFP, was proposed to overcome the obstacle by compressing the SSFP profile into the width of a single voxel...
December 30, 2016: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28088652/convergence-of-interoception-emotion-and-social-cognition-a-twofold-fmri-meta-analysis-and-lesion-approach
#13
Federico Adolfi, Blas Couto, Fabian Richter, Jean Decety, Jessica Lopez, Mariano Sigman, Facundo Manes, Agustín Ibáñez
Guided by indirect evidence, recent approaches propose a tripartite crosstalk among interoceptive signaling, emotional regulation, and low-level social cognition. Here we examined the neurocognitive convergence of such domains. First, we performed three meta-analyses of functional magnetic resonance imaging studies to identify which areas are consistently coactivated by these three systems. Multi-level Kernel Density Analysis (MKDA) revealed major overlaps in the right anterior insular and frontotemporal regions (viz...
December 29, 2016: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
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
#14
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/28077494/practice-guideline-summary-use-of-fmri-in-the-presurgical-evaluation-of-patients-with-epilepsy-report-of-the-guideline-development-dissemination-and-implementation-subcommittee-of-the-american-academy-of-neurology
#15
Jerzy P Szaflarski, David Gloss, Jeffrey R Binder, William D Gaillard, Alexandra J Golby, Scott K Holland, Jeffrey Ojemann, David C Spencer, Sara J Swanson, Jacqueline A French, William H Theodore
OBJECTIVE: To assess the diagnostic accuracy and prognostic value of functional MRI (fMRI) in determining lateralization and predicting postsurgical language and memory outcomes. METHODS: An 11-member panel evaluated and rated available evidence according to the 2004 American Academy of Neurology process. At least 2 panelists reviewed the full text of 172 articles and selected 37 for data extraction. Case reports, reports with <15 cases, meta-analyses, and editorials were excluded...
January 24, 2017: Neurology
https://www.readbyqxmd.com/read/28076421/oscillatory-dynamics-supporting-semantic-cognition-meg-evidence-for-the-contribution-of-the-anterior-temporal-lobe-hub-and-modality-specific-spokes
#16
Giovanna Mollo, Piers L Cornelissen, Rebecca E Millman, Andrew W Ellis, Elizabeth Jefferies
The "hub and spoke model" of semantic representation suggests that the multimodal features of objects are drawn together by an anterior temporal lobe (ATL) "hub", while modality-specific "spokes" capture perceptual/action features. However, relatively little is known about how these components are recruited through time to support object identification. We used magnetoencephalography to measure neural oscillations within left ATL, lateral fusiform cortex (FC) and central sulcus (CS) during word-picture matching at different levels of specificity (employing superordinate vs...
2017: PloS One
https://www.readbyqxmd.com/read/28065876/three-dimensional-anatomy-of-the-white-matter-fibers-of-the-temporal-lobe-surgical-implications
#17
L Pescatori, M P Tropeano, A Manfreda, R Delfini, A Santoro
BACKGROUND: The aim of this work is to describe in detail the complex three-dimensional organization of the white matter of the temporal lobe and discuss the surgical implications of the approaches to lesions located into the mesial temporal region and within the temporal horn and the atrium of the lateral ventricles. METHODS: Sixteen human cerebral hemispheres fixed in a 10% formalin solution for at least 40 days were studied. After removal of the arachnoid membrane, the hemispheres were frozen at -15 C° for at least 15 days , and the Klingler' technique which consist in the microscopic dissection and progressive identification of white matter fibers was performed...
January 5, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28057091/-resting-state-functional-magnetic-resonance-study-of-brain-function-changes-after-tips-operation-in-patients-with-liver-cirrhosis
#18
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/28053037/left-anterior-temporal-lobe-and-bilateral-anterior-cingulate-cortex-are-semantic-hub-regions-evidence-from-behavior-nodal-degree-mapping-in-brain-damaged-patients
#19
Ying Zhao, Luping Song, Junhua Ding, Nan Lin, Qiang Wang, Xiaoxia Du, Rong Sun, Zaizhu Han
: The organizational principles of semantic memory in the human brain are still controversial. Although studies have shown that the semantic system contains hub regions that bind information from different sensorimotoric modalities to form concepts, it is unknown whether there are hub regions other than the anterior temporal lobe (ATL). Meanwhile, previous studies have rarely used network measurements to explore the hubs or correlated network indexes with semantic performance, although the most direct supportive evidence of hubs should come from the network perspective...
January 4, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28048305/su-f-j-139-amplitude-of-low-frequency-fluctuation-alff-and-regional-homogeneity-reho-study-of-the-respiration-motion-control-byhypnosis
#20
Y Liu, R Li, Y Xie
PURPOSE: Respiration control by hypnosis is a method in reducing the detriment to the healthy organs or organizations for patients during radiotherapy, especially for lung and abdomen cancer (Fig.1). It's hypothesized that there exists alterations neurological brain activity during the hypnosis state of respiratory motion control in comparison with resting state. METHODS: Thirteen healthy volunteers were organized to participate in a hypnosis experiment that consisted of two sectional scans of functional magnetic resonance imaging (fMRI), rest state condition (RSC) scanning and hypnosis state condition (HSC) scanning...
June 2016: Medical Physics
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