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Anterior temporal lobe

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https://www.readbyqxmd.com/read/29332063/diffusion-tensor-imaging-investigation-of-uncinate-fasciculus-anatomy-in-healthy-controls-description-of-a-subgenual-stem
#1
Kartik Bhatia, Luke Henderson, Mark Yim, Eugene Hsu, Rajiv Dhaliwal
The uncinate fasciculus is the largest white matter association tract connecting the prefrontal cortex and the anteromedial temporal lobe. The traditional anatomical description outlines a temporal stem that hooks around the posterior insula, a subinsular body, and 2 prefrontal stems extending to the lateral orbital gyri and the frontopolar cortex. Recent imaging studies of the white matter tracts deep to the subgenual cingulate gyrus (Brodmann area 25: BA25) suggest the presence of white matter fibers extending from BA25 to the amygdala, via a route that would run in close proximity to the uncinate fasciculus, that are of functional importance in mood disorders...
January 12, 2018: Neuropsychobiology
https://www.readbyqxmd.com/read/29331847/longitudinal-hippocampal-and-extra-hippocampal-microstructural-and-macrostructural-changes-following-temporal-lobe-epilepsy-surgery
#2
Cameron A Elliott, Donald W Gross, B Matt Wheatley, Christian Beaulieu, Tejas Sankar
OBJECTIVES: 1) Characterize the evolution of microstructural changes in the contralateral, non-operated hippocampus-using longitudinal diffusion tensor imaging (DTI)-following surgery for temporal lobe epilepsy (TLE). 2) Characterize the downstream extra-hippocampal volumetric changes of the fornix and mammillary bodies after TLE surgery. 3) Examine the relationship between these measures and seizure/cognitive outcome. METHODS: Serial structural and DTI brain MRI scans were collected in 25 TLE patients pre- and post-surgery (anterior temporal lobectomy, ATL - 13; selective amygdalohippocampectomy, SelAH - 12) and in 12 healthy controls...
January 6, 2018: Epilepsy Research
https://www.readbyqxmd.com/read/29317611/metabotropic-glutamate-receptor-5-binding-in-male-patients-with-alcohol-use-disorder
#3
Funda Akkus, Yoan Mihov, Valerie Treyer, Simon M Ametamey, Anass Johayem, Smeralda Senn, Susanne Rösner, Alfred Buck, Gregor Hasler
Glutamate signaling plays a major role in addiction. Preclinical research strongly suggests an implication of G-protein-coupled metabotropic glutamate receptor subtype 5 (mGluR5) in nicotine addiction and alcohol use disorder. In humans, smoking is related to a global reduction in mGluR5 availability. In the present study, we investigated mGluR5 in vivo in patients with alcohol use disorder without the confounding effects of smoking. A total of 14 male subjects with alcohol use disorder and at least a 25-day abstinence and 14 matched male non-smoking healthy controls were included in the study...
January 10, 2018: Translational Psychiatry
https://www.readbyqxmd.com/read/29305185/predictors-of-outcome-after-surgery-in-134-children-with-drug-resistant-tle
#4
Ashalatha Radhakrishnan, Ramshekhar Menon, Mathew Abraham, George Vilanilam, Suvasini Sharma, Bejoy Thomas, Chandrashekharan Kesavadas, Ajith Cherian, Raviprasad Varma, Sanjeev V Thomas
PURPOSE: To determine the factors predicting seizure outcome in children who underwent anterior temporal lobectomy (ATL) for drug-resistant temporal lobe epilepsy (TLE). METHODS: Among the 664 patients who underwent ATL for TLE from 1995 to 2008, there were 134 children. "Excellent" outcome in them was defined as seizure freedom during the entire follow-up (Engel class I a); "good outcome", if in remission last 2 years, and the rest as "unfavorable outcome". To identify the potential predictors of seizure recurrence, the attributes of recurred and non-recurred groups was compared by univariate and multivariate analysis...
January 2, 2018: Epilepsy Research
https://www.readbyqxmd.com/read/29305037/transauricular-vagus-nerve-stimulation-at-auricular-acupoints-kindey-co10-yidan-co11-liver-co12-and-shenmen-tf4-can-induce-auditory-and-limbic-cortices-activation-measured-by-fmri
#5
Liyan Peng, Ketao Mu, Aiguo Liu, Liangqiang Zhou, Yueyue Gao, Imrit Tejvansh Shenoy, Zhigang Mei, Qingguo Chen
The purpose of this study was to explore the central mechanism of transauricular vagus nerve stimulation (taVNS) to human by fMRI and to find a suitable taVNS site for potential tinnitus treatment. 24 healthy subjects aged between 28 and 38 years were enrolled in the experiment. 8 subjects were stimulated in the auricular acupoints Kindey (CO10), Yidan (CO11), Liver (CO12) and Shenmen (TF4) in the left ear, 8 subjects were stimulated at the anterior wall of the auditory canal and left lower limb as an anterior stimulation group; 8 persons who were arranged in a sham group received taVNS at the left ear lobe and tail of the helix...
December 24, 2017: Hearing Research
https://www.readbyqxmd.com/read/29304183/white-matter-alterations-in-parkinson-s-disease-with-normal-cognition-precede-grey-matter-atrophy
#6
Ivan Rektor, Alena Svátková, Lubomir Vojtíšek, Iva Zikmundová, Jirí Vaníček, András Király, Nikoletta Szabó
INTRODUCTION: While progressive MRI brain changes characterize advanced Parkinson's disease (PD), little has been discovered about structural alterations in the earliest phase of the disease, i.e. in patients with motor symptoms and with normal cognition. Our study aimed to detect grey matter (GM) and white matter (WM) changes in PD patients without cognitive impairment. METHODS: Twenty PD patients and twenty-one healthy controls (HC) were tested for attention, executive function, working memory, and visuospatial and language domains...
2018: PloS One
https://www.readbyqxmd.com/read/29304146/from-early-stress-to-12-month-development-in-very-preterm-infants-preliminary-findings-on-epigenetic-mechanisms-and-brain-growth
#7
Monica Fumagalli, Livio Provenzi, Pietro De Carli, Francesca Dessimone, Ida Sirgiovanni, Roberto Giorda, Claudia Cinnante, Letizia Squarcina, Uberto Pozzoli, Fabio Triulzi, Paolo Brambilla, Renato Borgatti, Fabio Mosca, Rosario Montirosso
Very preterm (VPT) infants admitted to Neonatal Intensive Care Unit (NICU) are at risk for altered brain growth and less-than-optimal socio-emotional development. Recent research suggests that early NICU-related stress contributes to socio-emotional impairments in VPT infants at 3 months through epigenetic regulation (i.e., DNA methylation) of the serotonin transporter gene (SLC6A4). In the present longitudinal study we assessed: (a) the effects of NICU-related stress and SLC6A4 methylation variations from birth to discharge on brain development at term equivalent age (TEA); (b) the association between brain volume at TEA and socio-emotional development (i...
2018: PloS One
https://www.readbyqxmd.com/read/29304050/severe-hyposmia-and-aberrant-functional-connectivity-in-cognitively-normal-parkinson-s-disease
#8
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/29301970/transient-ischemic-attack-results-in-delayed-brain-atrophy-and-cognitive-decline
#9
Andrew Bivard, Thomas Lillicrap, Bénédicte Maréchal, Carlos Garcia-Esperon, Elizabeth Holliday, Venkatesh Krishnamurthy, Christopher R Levi, Mark Parsons
BACKGROUND AND PURPOSE: Transient ischemic attack (TIA) initiates an ischemic cascade without resulting in frank infarction and, as such, represents a novel model to study the effects of this ischemic cascade and secondary neurodegeneration in humans. METHODS: Patients with suspected TIA underwent acute brain perfusion imaging, and those with acute ischemia were enrolled into a prospective observational study. We collected baseline and 90-day magnetic resonance imaging, including MP-RAGE (high-resolution T1 sequence) and cognitive assessment with the Montreal Cognitive Assessment...
January 4, 2018: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/29298164/neural-activity-during-mental-rotation-in-deaf-signers-the-influence-of-long-term-sign-language-experience
#10
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/29289617/the-anterior-ventrolateral-temporal-lobe-contributes-to-boosting-visual-working-memory-capacity-for-items-carrying-semantic-information
#11
Rocco Chiou, Matthew A Lambon Ralph
Working memory (WM) is a buffer that temporarily maintains information, be it visual or auditory, in an active state, caching its contents for online rehearsal or manipulation. How the brain enables long-term semantic knowledge to affect the WM buffer is a theoretically significant issue awaiting further investigation. In the present study, we capitalise on the knowledge about famous individuals as a 'test-case' to study how it impinges upon WM capacity for human faces and its neural substrate. Using continuous theta-burst transcranial stimulation combined with a psychophysical task probing WM storage for varying contents, we provide compelling evidence that (1) faces (regardless of familiarity) continued to accrue in the WM buffer with longer encoding time, whereas for meaningless stimuli (colour shades) there was little increment; (2) the rate of WM accrual was significantly more efficient for famous faces, compared to unknown faces; (3) the right anterior-ventrolateral temporal lobe (ATL) causally mediated this superior WM storage for famous faces...
December 28, 2017: NeuroImage
https://www.readbyqxmd.com/read/29289335/cognitive-consequences-of-the-left-right-asymmetry-of-atrophy-in-semantic-dementia
#12
Anna M Woollams, Karalyn Patterson
Semantic dementia (SD) is a condition in which atrophy to the anterior temporal lobes (ATL) produces a selective deterioration of conceptual knowledge. As this atrophy is always bilateral but usually asymmetrical, differences in performance of the two SD subgroups-with left > right (L > R) versus right > left (R > L) atrophy-constitute a major source of evidence regarding the roles of the left and right sides of this region. We explored this issue using large scale case-series methodology, with a pool of 216 observations of neuropsychological data from 72 patients with SD...
December 5, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29287243/individual-variation-in-the-propensity-for-prospective-thought-is-associated-with-functional-integration-between-visual-and-retrosplenial-cortex
#13
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/29284675/test-retest-reproducibility-for-the-tau-pet-imaging-agent-flortaucipir-f-18
#14
Michael D Devous, Abhinay D Joshi, Michael Navitsky, Sudeepti Southekal, Michael J Pontecorvo, Haiqing Shen, Ming Lu, William R Shankle, John P Seibyl, Ken Marek, Mark A Mintun
Background: Alzheimer's disease (AD) is characterized by beta-amyloid plaques (Aβ) and tau neurofibrillary tangles (NFTs). There are several PET imaging biomarkers for Aβ including 11C-PiB and 18F florbetapir. Recently, PET tracers for tau NFTs have become available and have shown utility in detection and monitoring of neurofibrillary pathology over time. Flortaucipir F 18 is one such tracer. Initial clinical studies indicated greater tau binding in AD and MCI patients compared to controls in a pattern consistent with tau pathology observed at autopsy...
December 28, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/29282347/-a-case-of-kanji-agraphia-resulting-from-intracerebral-hemorrhage-on-the-left-temporal-lobe-associated-with-multiple-dural-arteriovenous-fistulas
#15
Sakura Kurosu, Yasunobu Nakai, Satoshi Yamada, Tomoko Chujo, Etsuko Mori, Junzo Nakao, Kazuya Uemura
A 60-year-old, right-handed man suffered from mild word finding difficulties and kanji agraphia. Brain computed tomography revealed left temporal lobe hemorrhage, and cerebral angiogram revealed multiple dural arteriovenous fistulas (d-AVFs) in the left anterior cranial fossa and middle cranial fossa. Surgical shunt ablation was performed, and the lesions were obliterated completely. Analysis of the kanji agraphia during neuropsychological rehabilitation showed similar symptoms to those of the left posterior inferior temporal lobe lesion...
December 2017: Brain and Nerve, Shinkei Kenkyū No Shinpo
https://www.readbyqxmd.com/read/29261031/alterations-of-emotional-reactivity-following-righttemporal-lobectomy
#16
Mary K Morris, Dawn Bowers, John Williamson, Kenneth M Heilman
To learn if a right temporal lobectomy altered a patient's autonomic and cognitive responses to aversive and appetitive pictures, we investigated a man whose right anterior temporal lobe and amygdala had been resected to remove an arteriovenous malformation. This patient revealed unusually low self-reports of arousal with a lack of heightened skin conductance responses to aversive pictures. For pleasant pictures, his self-reports of arousal and his physiological responses were similar to healthy men. This patient's responses are consistent with a bivalent model of emotional processing, with a right temporal lobectomy compromising the activation of his defensive action response system...
December 20, 2017: Neurocase
https://www.readbyqxmd.com/read/29259547/a-radial-glia-fascicle-leads-principal-neurons-from-the-pallial-subpallial-boundary-into-the-developing-human-insula
#17
Emilio González-Arnay, Miriam González-Gómez, Gundela Meyer
The human insular lobe, in the depth of the Sylvian fissure, displays three main cytoarchitectonic divisions defined by the differentiation of granular layers II and IV. These comprise a rostro-ventral agranular area, an intermediate dysgranular area, and a dorso-caudal granular area. Immunohistochemistry in human embryos and fetuses using antibodies against PCNA, Vimentin, Nestin, Tbr1, and Tb2 reveals that the insular cortex is unique in that it develops far away from the ventricular zone (VZ), with most of its principal neurons deriving from the subventricular zone (SVZ) of the pallial-subpallial boundary (PSB)...
2017: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/29259537/a-hierarchical-bayesian-model-for-the-identification-of-pet-markers-associated-to-the-prediction-of-surgical-outcome-after-anterior-temporal-lobe-resection
#18
Sharon Chiang, Michele Guindani, Hsiang J Yeh, Sandra Dewar, Zulfi Haneef, John M Stern, Marina Vannucci
We develop an integrative Bayesian predictive modeling framework that identifies individual pathological brain states based on the selection of fluoro-deoxyglucose positron emission tomography (PET) imaging biomarkers and evaluates the association of those states with a clinical outcome. We consider data from a study on temporal lobe epilepsy (TLE) patients who subsequently underwent anterior temporal lobe resection. Our modeling framework looks at the observed profiles of regional glucose metabolism in PET as the phenotypic manifestation of a latent individual pathologic state, which is assumed to vary across the population...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29247965/predictive-value-of-preoperative-statistical-parametric-mapping-of-regional-glucose-metabolism-in-mesial-temporal-lobe-epilepsy-with-hippocampal-sclerosis
#19
Martin Kojan, Irena Doležalová, Eva Koriťáková, Radek Mareček, Zdeněk Řehák, Markéta Hermanová, Milan Brázdil, Ivan Rektor
OBJECTIVE: This study was designed to use statistical parametric mapping of interictal positron-emission tomography using [18F]Fluorodeoxyglucose (FDG-PET) to compare the brain metabolisms of patients with mesial temporal lobe epilepsy (MTLE)/hippocampal sclerosis and controls. Another aim of this study was to analyze the potential differences among patients in terms of epilepsy duration, side of hippocampal sclerosis, histopathological findings, insult in their history, and postoperative outcomes...
December 13, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29243982/endoscopic-transorbital-superior-eyelid-approach-anatomical-study-from-a-neurosurgical-perspective
#20
Alberto Di Somma, Norberto Andaluz, Luigi Maria Cavallo, Matteo de Notaris, Iacopo Dallan, Domenico Solari, Lee A Zimmer, Jeffrey T Keller, Mario Zuccarello, Alberto Prats-Galino, Paolo Cappabianca
OBJECTIVE Recent studies have proposed the superior eyelid endoscopic transorbital approach as a new minimally invasive route to access orbital lesions, mostly in otolaryngology and maxillofacial surgeries. The authors undertook this anatomical study in order to contribute a neurosurgical perspective, exploring the anterior and middle cranial fossa areas through this purely endoscopic transorbital trajectory. METHODS Anatomical dissections were performed in 10 human cadaveric heads (20 sides) using 0° and 30° endoscopes...
December 15, 2017: Journal of Neurosurgery
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