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https://www.readbyqxmd.com/read/28912300/-18-f-av-1451-binding-in-vivo-mirrors-the-expected-distribution-of-tdp-43-pathology-in-the-semantic-variant-of-primary-progressive-aphasia
#1
W R Bevan-Jones, Thomas E Cope, P Simon Jones, Luca Passamonti, Young T Hong, Tim D Fryer, Robert Arnold, Kieren S J Allinson, Jonathan P Coles, Franklin I Aigbirhio, Karalyn Patterson, John T O'Brien, James B Rowe
INTRODUCTION: Semantic dementia, including the semantic variant of primary progressive aphasia (svPPA), is strongly associated with TAR-DNA binding protein 43 (TDP-43) type C pathology. It provides a useful model in which to test the specificity of in vivo binding of the putative tau ligand [(18)F]AV-1451, which is elevated in frontotemporal lobar degeneration tauopathies. METHODS AND RESULTS: Seven patients (five with svPPA and two with 'right' semantic dementia) and 12 healthy controls underwent positron emission tomography brain imaging with [(18)F]AV-1451...
September 14, 2017: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/28906375/correlations-between-clinical-characteristics-and-neuroimaging-in-chinese-patients-with-subtypes-of-frontotemporal-lobe-degeneration
#2
Zhihong Shi, Shuai Liu, Ying Wang, Shuling Liu, Tong Han, Li Cai, Yuying Zhou, Shuo Gao, Yong Ji
The aim of the study was to obtain an overview of the clinical and neuroimaging features of Chinese patients with subtypes of frontotemporal lobe degeneration (FTLD).We evaluated the demographic features, clinical presentation, and lobe atrophy depicted by magnetic resonance imaging (MRI) in 133 patients with FTLD. Two positron emission tomography (PET) scans were performed at baseline: [C]Pittsburgh compound B PET to assess amyloid-β plaque load and [F]fluorodeoxyglucose (FDG) PET to assess glucose metabolism...
September 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28904449/james-wenceslaus-papez-his-circuit-and-emotion
#3
Kalyan B Bhattacharyya
James Papez worked on the anatomical substrates of emotion and described a circuit, mainly composed of the hippocampus, thalamus and cingulum, and published his observations in 1937. However, such an idea existed before him, as evidenced by the rudimentary indications from Paul Broca, and Paul MacLean added some other structures like, septum, amygdala, and hypothalamus in its ambit and called it the limbic system. Paul Ivan Yakovlev, proposed a circuit which also referred to orbitofrontal, insular, anterior temporal lobe, and other nuclei of thalamus...
July 2017: Annals of Indian Academy of Neurology
https://www.readbyqxmd.com/read/28811257/auditory-conflict-and-congruence-in-frontotemporal-dementia
#4
Camilla N Clark, Jennifer M Nicholas, Jennifer L Agustus, Christopher J D Hardy, Lucy L Russell, Emilie V Brotherhood, Katrina M Dick, Charles R Marshall, Catherine J Mummery, Jonathan D Rohrer, Jason D Warren
Impaired analysis of signal conflict and congruence may contribute to diverse socio-emotional symptoms in frontotemporal dementias, however the underlying mechanisms have not been defined. Here we addressed this issue in patients with behavioural variant frontotemporal dementia (bvFTD; n = 19) and semantic dementia (SD; n = 10) relative to healthy older individuals (n = 20). We created auditory scenes in which semantic and emotional congruity of constituent sounds were independently probed; associated tasks controlled for auditory perceptual similarity, scene parsing and semantic competence...
August 12, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28756485/laterality-of-anterior-temporal-lobe-repetitive-transcranial-magnetic-stimulation-determines-the-degree-of-disruption-in-picture-naming
#5
Anna M Woollams, Lee J Lindley, Gorana Pobric, Paul Hoffman
The bilateral anterior temporal lobes play a key role in semantic representation. This is clearly demonstrated by the performance of patients with semantic dementia, a disorder characterised by a progressive and selective decline in semantic memory over all modalities as a result of anterior temporal atrophy. Although all patients exhibit a progressive decline in both single-word production and comprehension, those with greater atrophy to the left anterior temporal lobe show a stronger decline in word production than comprehension...
July 29, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28731453/topological-alterations-and-symptom-relevant-modules-in-the-whole-brain-structural-network-in-semantic-dementia
#6
Junhua Ding, Keliang Chen, Weibin Zhang, Ming Li, Yan Chen, Qing Yang, Yingru Lv, Qihao Guo, Zaizhu Han
BACKGROUND: Semantic dementia (SD) is characterized by a selective decline in semantic processing. Although the neuropsychological pattern of this disease has been identified, its topological global alterations and symptom-relevant modules in the whole-brain anatomical network have not been fully elucidated. OBJECTIVE: This study aims to explore the topological alteration of anatomical network in SD and reveal the modules associated with semantic deficits in this disease...
2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28666471/heterogeneous-ribonuclear-protein-e2-hnrnp-e2-is-associated-with-tdp-43-immunoreactive-neurites-in-semantic-dementia-but-not-with-other-tdp-43-pathological-subtypes-of-frontotemporal-lobar-degeneration
#7
Yvonne S Davidson, Andrew C Robinson, Louis Flood, Sara Rollinson, Bridget C Benson, Yasmine T Asi, Anna Richardson, Matthew Jones, Julie S Snowden, Stuart Pickering-Brown, Tammaryn Lashley, David M A Mann
Frontotemporal Lobar Degeneration (FTLD) encompasses certain related neurodegenerative disorders which alter personality and cognition. Heterogeneous ribonuclear proteins (hnRNPs) maintain RNA metabolism and changes in their function may underpin the pathogenesis of FTLD. Immunostaining for hnRNP E2 was performed on sections of frontal and temporal cortex with hippocampus from 80 patients with FTLD, stratified by pathology into FTLD-tau and FTLD-TDP type A, B and C subtypes, and by genetics into patients with C9orf72 expansions, MAPT or GRN mutations, or those with no known mutation, and on 10 healthy controls...
June 30, 2017: Acta Neuropathologica Communications
https://www.readbyqxmd.com/read/28646671/frontotemporal-lobar-degeneration-and-social-behaviour-dissociation-between-the-knowledge-of-its-consequences-and-its-conceptual-meaning
#8
Roland Zahn, Sophie Green, Helen Beaumont, Alistair Burns, Jorge Moll, Diana Caine, Alexander Gerhard, Paul Hoffman, Benjamin Shaw, Jordan Grafman, Matthew A Lambon Ralph
Inappropriate social behaviour is an early symptom of frontotemporal lobar degeneration (FTLD) in both behavioural variant frontotemporal dementia (bvFTD) and semantic dementia (SD) subtypes. Knowledge of social behaviour is essential for appropriate social conduct. The superior anterior temporal lobe (ATL) has been identified as one key neural component for the conceptual knowledge of social behaviour, but it is unknown whether this is dissociable from knowledge of the consequences of social behaviour. Here, we used a newly-developed test of knowledge about long-term and short-term consequences of social behaviour to investigate its impairment in patients with FTLD relative to a previously-developed test of social conceptual knowledge...
August 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28624681/semantic-word-category-processing-in-semantic-dementia-and-posterior-cortical-atrophy
#9
Zubaida Shebani, Karalyn Patterson, Peter J Nestor, Lara Z Diaz-de-Grenu, Kate Dawson, Friedemann Pulvermüller
There is general agreement that perisylvian language cortex plays a major role in lexical and semantic processing; but the contribution of additional, more widespread, brain areas in the processing of different semantic word categories remains controversial. We investigated word processing in two groups of patients whose neurodegenerative diseases preferentially affect specific parts of the brain, to determine whether their performance would vary as a function of semantic categories proposed to recruit those brain regions...
August 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28593829/communication-behaviors-associated-with-successful-conversation-in-semantic-variant-primary-progressive-aphasia
#10
Cathleen Taylor-Rubin, Karen Croot, Emma Power, Sharon A Savage, John R Hodges, Leanne Togher
BACKGROUND: Primary progressive aphasia (PPA) affects a range of language and cognitive domains that impact on conversation. Little is known about conversation breakdown in the semantic variant of PPA (svPPA, also known as semantic dementia). This study investigates conversation of people with svPPA. METHODS: Dyadic conversations about everyday activities between seven individuals with svPPA and their partners, and seven control pairs were video recorded and transcribed...
June 8, 2017: International Psychogeriatrics
https://www.readbyqxmd.com/read/28579952/brain-network-for-the-core-deficits-of-semantic-dementia-a-neural-network-connectivity-behavior-mapping-study
#11
Yan Chen, Keliang Chen, Junhua Ding, Yumei Zhang, Qing Yang, Yingru Lv, Qihao Guo, Zaizhu Han
Individuals with semantic dementia (SD) typically suffer from selective semantic deficits due to degenerative brain atrophy. Although some brain regions have been found to be correlated with the semantic impairments of SD patients, it is unclear if the damage is actually responsible for SD patients' semantic disorders because these findings were primarily obtained by examining the roles of local individual regions themselves without considering the influence of other regions that are functionally or structurally connected to the local individual regions...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28532703/reading-difficulties-in-primary-progressive-aphasia-in-a-regular-language-speaking-cohort-of-patients
#12
Jordi A Matías-Guiu, Fernando Cuetos, María Nieves Cabrera-Martín, María Valles-Salgado, Teresa Moreno-Ramos, José Luis Carreras, Jorge Matías-Guiu
Reading impairment is an important feature in Primary Progressive Aphasia (PPA). The Spanish orthography entails completely regular spelling to sound correspondences, so reading disorders may be different to English. In the current study, reading, phonological and semantic abilities of 35 patients with the three variants of PPA, and 13 healthy volunteers were assessed. Brain metabolism was concomitantly obtained from each participant using (18)F-fluorodeoxyglucose positron emission tomography imaging. Two main patterns of impairment were identified: difficulties in nonwords reading with preservation of exception words in agrammatic and logopenic aphasia, and the inverse pattern in semantic dementia...
July 1, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28462742/suicide-and-assisted-dying-in-dementia-what-we-know-and-what-we-need-to-know-a-narrative-literature-review
#13
J Diehl-Schmid, R Jox, S Gauthier, S Belleville, E Racine, C Schüle, G Turecki, S Richard-Devantoy
BACKGROUND: Evidence-based data on prevalence and risk factors of suicidal intentions and behavior in dementia are as scarce as the data on assisted dying. The present literature review aimed on summarizing the current knowledge and provides a critical discussion of the results. METHODS: A systematic narrative literature review was performed using Medline, Cochrane Library, EMBASE, PSYNDEX, PSYCINFO, Sowiport, and Social Sciences Citation Index literature. RESULTS: Dementia as a whole does not appear to be a risk factor for suicide completion...
August 2017: International Psychogeriatrics
https://www.readbyqxmd.com/read/28455846/tool-use-in-neurodegenerative-diseases-planning-or-technical-reasoning
#14
Josselin Baumard, Mathieu Lesourd, Chrystelle Remigereau, Christophe Jarry, Frédérique Etcharry-Bouyx, Valérie Chauviré, François Osiurak, Didier Le Gall
Recent works showed that tool use can be impaired in stroke patients because of either planning or technical reasoning deficits, but these two hypotheses have not yet been compared in the field of neurodegenerative diseases. The aim of this study was to address the relationships between real tool use, mechanical problem-solving, and planning skills in patients with Alzheimer's disease (AD, n = 32), semantic dementia (SD, n = 16), and corticobasal syndrome (CBS, n = 9). Patients were asked to select and use ten common tools, to solve three mechanical problems, and to complete the Tower of London test...
April 29, 2017: Journal of Neuropsychology
https://www.readbyqxmd.com/read/28434708/dual-phase-18-f-florbetapir-positron-emission-tomography-in-patients-with-primary-progressive-aphasia-alzheimer-s-disease-and-healthy-controls-a-preliminary-study
#15
Hung-Chou Kuo, Ing-Tsung Hsiao, Chia-Ju Hsieh, Chu-Yun Huang, Kuo-Lun Huang, Yau-Yau Wai, Wen-Li Chuang, Mei-Ping Kung, Yi-Chuan Chu, Tzu-Chen Yen, Kun-Ju Lin, Chin-Chang Huang
BACKGROUND: To determine whether dual-phase (18)F-florbetapir positron emission tomography imaging with perfusion-like and amyloid deposition information can distinguish among primary progressive aphasia (PPA), Alzheimer's disease (AD), and healthy controls (HCs). METHODS: Patients diagnosed with PPA, including four semantic dementia (SD) and two progressive nonfluent aphasia (PNFA), as well as one logopenic variant (LV) of PPA, were studied. All PPA patients, and age-/sex-matched patients with probable AD (n=8) and HCs (n=8) were subjected to dual-phase (18)F-florbetapir imaging...
April 20, 2017: Journal of the Formosan Medical Association, Taiwan Yi Zhi
https://www.readbyqxmd.com/read/28374287/the-differential-contributions-of-conceptual-representation-format-and-language-structure-to-levels-of-semantic-abstraction-capacity
#16
REVIEW
Guido Gainotti
This paper reviews some controversies concerning the original and revised versions of the 'hub-and-spoke' model of conceptual representations and their implication for abstraction capacity levels. The 'hub-and-spoke' model, which is based on data gathered in patients with semantic dementia (SD), is the most authoritative model of conceptual knowledge. Patterson et al.'s (Nature Reviews Neuroscience, 8(12), 976-987, 2007) classical version of this model maintained that conceptual representations are stored in a unitary 'amodal' format in the right and left anterior temporal lobes (ATLs), because in SD the semantic disorder cuts across modalities and categories...
April 3, 2017: Neuropsychology Review
https://www.readbyqxmd.com/read/28326689/behavioural-and-neuropsychiatric-disturbance-in-three-clinical-subtypes-of-frontotemporal-dementia-a-clinical-research-center-for-dementia-of-south-korea-ftd-study
#17
Moon Ho Park, Eun-Joo Kim, Kyung Won Park, Jae Cheol Kwon, Bon D Ku, Seol-Heui Han, SangYun Kim, Dong Won Yang, Duk L Na, Seong Hye Choi
OBJECTIVES: To characterise the behavioural and neuropsychiatric disturbances of patients with three clinical subtypes of frontotemporal dementia (FTD): behavioural variant FTD (bvFTD), semantic dementia (SD) and progressive non-fluent aphasia (PNFA). METHODS: Consecutive series of 66 patients with bvFTD, 58 patients with SD and 21 patients with PNFA were compared using the Frontal Behavioural Inventory (FBI) and the Neuropsychiatric Inventory (NPI). RESULTS: Patients with bvFTD had more behavioural and neuropsychiatric disturbances than patients with PNFA based on the total scores of FBI and NPI...
March 2017: Australasian Journal on Ageing
https://www.readbyqxmd.com/read/28322905/bilingualism-delays-the-onset-of-behavioral-but-not-aphasic-forms-of-frontotemporal-dementia
#18
Suvarna Alladi, Thomas H Bak, Mekala Shailaja, Divyaraj Gollahalli, Amulya Rajan, Bapiraju Surampudi, Michael Hornberger, Vasanta Duggirala, Jaydip Ray Chaudhuri, Subhash Kaul
Bilingualism has been found to delay onset of dementia and this has been attributed to an advantage in executive control in bilinguals. However, the relationship between bilingualism and cognition is complex, with costs as well as benefits to language functions. To further explore the cognitive consequences of bilingualism, the study used Frontotemporal dementia (FTD) syndromes, to examine whether bilingualism modifies the age at onset of behavioral and language variants of Frontotemporal dementia (FTD) differently...
March 18, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28288787/evolution-of-autobiographical-memory-impairments-in-alzheimer-s-disease-and-frontotemporal-dementia-a-longitudinal-neuroimaging-study
#19
Muireann Irish, Ramon Landin-Romero, Annu Mothakunnel, Siddharth Ramanan, Sharpley Hsieh, John R Hodges, Olivier Piguet
Compromised autobiographical memory (ABM) retrieval is well established in dementia, attributable to degeneration of a core memory brain network. It remains unclear, however, how the progressive spread of atrophy with advancing disease severity impacts ABM retrieval across life epochs. To this end, we conducted a longitudinal study of recent and remote ABM in Alzheimer's disease (AD, n =11), and a frontotemporal lobar degeneration group (FTD, n =13) comprising 7 behavioral variant FTD and 6 semantic dementia patients, in comparison with 23 healthy older Controls...
March 10, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28244174/damage-to-right-medial-temporal-structures-disrupts-the-capacity-for-scene-construction-a-case-study
#20
Muireann Irish, Annu Mothakunnel, Nadene Dermody, Nikki-Anne Wilson, John R Hodges, Olivier Piguet
The medial temporal lobes (MTLs) are widely held to support a range of constructive endeavors including remembering the past, envisaging the future, and imagining hypothetical scenarios. While right MTL structures have been ascribed a prominent role in the construction of spatial contexts, lesion evidence to directly test this hypothesis is lacking. To this end, we assessed scene construction performance in two cases, GC and DF, who presented with left- and right-lateralized presentations of semantic dementia, respectively...
February 28, 2017: Hippocampus
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