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Semantic dementia

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https://www.readbyqxmd.com/read/29441012/a-modified-reading-the-mind-in-the-eyes-test-predicts-behavioral-variant-frontotemporal-dementia-better-than-executive-function-tests
#1
Matthias L Schroeter, Sarah Pawelke, Sandrine Bisenius, Jana Kynast, Katharina Schuemberg, Maryna Polyakova, Sarah Anderl-Straub, Adrian Danek, Klaus Fassbender, Holger Jahn, Frank Jessen, Johannes Kornhuber, Martin Lauer, Johannes Prudlo, Anja Schneider, Ingo Uttner, Angelika Thöne-Otto, Markus Otto, Janine Diehl-Schmid
Behavioral variant frontotemporal dementia (bvFTD) is characterized by deep alterations in behavior and personality. Although revised diagnostic criteria agree for executive dysfunction as most characteristic, impairments in social cognition are also suggested. The study aimed at identifying those neuropsychological and behavioral parameters best discriminating between bvFTD and healthy controls. Eighty six patients were diagnosed with possible or probable bvFTD according to Rascovsky et al. (2011) and compared with 43 healthy age-matched controls...
2018: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/29432768/reading-and-visual-word-recognition-ability-in-semantic-dementia-is-not-predicted-by-semantic-performance
#2
David Playfoot, Jac Billington, Jeremy J Tree
This paper describes longitudinal testing of two Semantic Dementia (SD) cases. It is common for patients with SD to present with deficits in reading aloud irregular words (i.e. surface dyslexia), and in lexical decision. Theorists from the connectionist tradition (e.g. Woollams, et al., 2007) argue that in SD cases with concurrent surface dyslexia, the deterioration of irregular word reading and recognition performance is related to the extent of the deterioration of the semantic system. The Dual Route Cascaded model (DRC; Coltheart et al...
February 9, 2018: Neuropsychologia
https://www.readbyqxmd.com/read/29430242/gustatory-dysfunction-as-an-early-symptom-of-semantic-dementia
#3
Mariko Sakai, Hiroaki Kazui, Kazue Shigenobu, Kenjiro Komori, Manabu Ikeda, Takashi Nishikawa
Objective: To investigate the gustatory function in patients with semantic dementia (SD). Methods: Detection and recognition thresholds of the 4 basic tastes (sweet, salty, sour, and bitter), taste discrimination, and taste identification were evaluated in 18 patients with SD, 18 patients with Alzheimer disease (AD), and 22 healthy controls. Results: Total detection and recognition threshold values were significantly higher in the SD and AD groups than in the control group...
September 2017: Dementia and Geriatric Cognitive Disorders Extra
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
#4
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/29424041/neuropsychological-differentiation-of-progressive-aphasic-disorders
#5
Jennifer M Harris, Jennifer A Saxon, Matthew Jones, Julie S Snowden, Jennifer C Thompson
The differentiation of subtypes of primary progressive aphasia (PPA) remains challenging. We aimed to identify optimum neuropsychological measures for characterizing PPA, to examine the relationship between behavioural change and subtypes of PPA and to determine whether characteristic profiles of language, working memory, and behavioural changes occur in PPA. Forty-seven patients with PPA and multi-domain Alzheimer's disease (AD) together with 19 age-matched controls underwent a large battery of working memory and language tests...
February 8, 2018: Journal of Neuropsychology
https://www.readbyqxmd.com/read/29423814/connectivity-based-characterisation-of-subcortical-grey-matter-pathology-in-frontotemporal-dementia-and-als-a-multimodal-neuroimaging-study
#6
Peter Bede, Taha Omer, Eoin Finegan, Rangariroyashe H Chipika, Parameswaran M Iyer, Mark A Doherty, Alice Vajda, Niall Pender, Russell L McLaughlin, Siobhan Hutchinson, Orla Hardiman
Frontotemporal dementia (FTD) phenotypes have distinctive and well-established cortical signatures, but their subcortical grey matter profiles are poorly characterised. The comprehensive characterisation of striatal and thalamic pathology along the ALS-FTD spectrum is particularly timely, as dysfunction of frontostriatal and cortico-thalamic networks contribute to phenotype-defining cognitive, behavioral, and motor deficits. Ten patients with behavioral-variant FTD, 11 patients with non-fluent-variant primary progressive aphasia, 5 patients with semantic-variant primary progressive aphasia, 14 ALS-FTD patients with C9orf72 hexanucleotide expansions, 12 ALS-FTD patients without hexanucleotide repeats, 36 ALS patients without cognitive impairment and 50 healthy controls were included in a prospective neuroimaging study...
February 8, 2018: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/29417704/cognitive-impairment-in-parkinson-s-disease-alzheimer-s-dementia-and-vascular-dementia-the-role-of-the-clock-drawing-test
#7
Cettina Allone, Viviana Lo Buono, Francesco Corallo, Lilla Bonanno, Rosanna Palmeri, Giuseppe Di Lorenzo, Angela Marra, Placido Bramanti, Silvia Marino
AIM: Cognitive impairment is present in several neurodegenerative disorders. The clock-drawing test (CDT) represents a useful screening instrument for assessing the evolution of cognitive decline. The aim of this study was to investigate the sensitivity of the CDT in monitoring and differentiating the evolution of cognitive decline in Alzheimer's dementia (AD), vascular dementia (VaD), and Parkinson's disease (PD). METHODS: This study involved 139 patients, including 39 patients with PD and mild cognitive impairment, 16 demented PD patients, 21 VaD patients with mild cognitive impairment, 17 patients with VaD, 33 patients with mild cognitive impairment due to AD, and 13 patients with probable AD...
February 7, 2018: Psychogeriatrics: the Official Journal of the Japanese Psychogeriatric Society
https://www.readbyqxmd.com/read/29409157/sentence-composition-ability-in-two-patients-with-non-fluent-agrammatic-variant-primary-progressive-aphasia
#8
Hiroyuki Watanabe, Minoru Matsuda, Shoko Ota, Toru Baba, Osamu Iizuka, Etsuro Mori
Agrammatism is one of the core clinical features of non-fluent/agrammatic variant primary progressive aphasia, and it has traditionally been considered the hallmark of non-fluent aphasia in Western countries. However, agrammatic speech may remain undetected in Japanese patients because of the agglutinative structure of the language and high flexibility in word order. In the present study, we aimed to analyze agrammatism in the speech production of Japanese patients with aphasia due to neurodegenerative disease using an anagram test generated by our laboratory...
February 6, 2018: Psychogeriatrics: the Official Journal of the Japanese Psychogeriatric Society
https://www.readbyqxmd.com/read/29407465/hypermetabolism-in-the-hippocampal-formation-of-cognitively-impaired-patients-indicates-detrimental-maladaptation
#9
Ivayla Apostolova, Catharina Lange, Anja Mäurer, Per Suppa, Lothar Spies, Michel J Grothe, Till Nierhaus, Jochen B Fiebach, Elisabeth Steinhagen-Thiessen, R Buchert
Structural deterioration and volume loss of the hippocampal formation is observed in many diseases associated with memory decline. Paradoxically, glucose metabolism of the hippocampal formation can be increased at the same time. This might be a consequence of compensatory (beneficial) or maladaptive (detrimental) mechanisms. Aim of this study was to differentiate between compensation and maladaptation by analyzing the association between glucose metabolism in the hippocampal formation measured by positron emission tomography with the glucose analogue 18F-fluorodeoxyglucose and cognitive performance as characterized by the extended Consortium to Establish a Registry for Alzheimer's Disease test battery in a sample of 87 patients (81...
January 31, 2018: Neurobiology of Aging
https://www.readbyqxmd.com/read/29394332/beyond-the-face-how-context-modulates-emotion-processing-in-frontotemporal-dementia-subtypes
#10
Fiona Kumfor, Agustin Ibañez, Rosalind Hutchings, Jessica L Hazelton, John R Hodges, Olivier Piguet
The importance of assessing social cognition to characterize dementia syndromes is increasingly recognized, with lower social cognition capacity associated with reduced functional independence and greater carer burden. Emotion recognition is impaired in both behavioural-variant frontotemporal dementia and semantic dementia, yet the social and behavioural changes observed in these syndromes in everyday situations varies. To date, most studies have investigated isolated, context-free stimuli indexing recognition of facial emotions only...
January 31, 2018: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29392464/primary-progressive-aphasia-a-clinical-approach
#11
Charles R Marshall, Chris J D Hardy, Anna Volkmer, Lucy L Russell, Rebecca L Bond, Phillip D Fletcher, Camilla N Clark, Catherine J Mummery, Jonathan M Schott, Martin N Rossor, Nick C Fox, Sebastian J Crutch, Jonathan D Rohrer, Jason D Warren
The primary progressive aphasias are a heterogeneous group of focal 'language-led' dementias that pose substantial challenges for diagnosis and management. Here we present a clinical approach to the progressive aphasias, based on our experience of these disorders and directed at non-specialists. We first outline a framework for assessing language, tailored to the common presentations of progressive aphasia. We then consider the defining features of the canonical progressive nonfluent, semantic and logopenic aphasic syndromes, including 'clinical pearls' that we have found diagnostically useful and neuroanatomical and other key associations of each syndrome...
February 1, 2018: Journal of Neurology
https://www.readbyqxmd.com/read/29387532/fdg-pet-and-csf-biomarker-accuracy-in-prediction-of-conversion-to-different-dementias-in-a-large-multicentre-mci-cohort
#12
Silvia Paola Caminiti, Tommaso Ballarini, Arianna Sala, Chiara Cerami, Luca Presotto, Roberto Santangelo, Federico Fallanca, Emilia Giovanna Vanoli, Luigi Gianolli, Sandro Iannaccone, Giuseppe Magnani, Daniela Perani
Background/aims: In this multicentre study in clinical settings, we assessed the accuracy of optimized procedures for FDG-PET brain metabolism and CSF classifications in predicting or excluding the conversion to Alzheimer's disease (AD) dementia and non-AD dementias. Methods: We included 80 MCI subjects with neurological and neuropsychological assessments, FDG-PET scan and CSF measures at entry, all with clinical follow-up. FDG-PET data were analysed with a validated voxel-based SPM method...
2018: NeuroImage: Clinical
https://www.readbyqxmd.com/read/29348485/motor-signatures-of-emotional-reactivity-in-frontotemporal-dementia
#13
Charles R Marshall, Chris J D Hardy, Lucy L Russell, Camilla N Clark, Rebecca L Bond, Katrina M Dick, Emilie V Brotherhood, Cath J Mummery, Jonathan M Schott, Jonathan D Rohrer, James M Kilner, Jason D Warren
Automatic motor mimicry is essential to the normal processing of perceived emotion, and disrupted automatic imitation might underpin socio-emotional deficits in neurodegenerative diseases, particularly the frontotemporal dementias. However, the pathophysiology of emotional reactivity in these diseases has not been elucidated. We studied facial electromyographic responses during emotion identification on viewing videos of dynamic facial expressions in 37 patients representing canonical frontotemporal dementia syndromes versus 21 healthy older individuals...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29335040/does-a-cognitive-stress-test-predict-progression-from-mild-cognitive-impairment-to-dementia-equally-well-in-clinical-versus-population-based-settings
#14
Joanne C Beer, Beth E Snitz, Chung-Chou H Chang, David A Loewenstein, Mary Ganguli
BACKGROUND: Evidence suggests that semantic interference may be a sensitive indicator of early dementia. We examined the utility of the Semantic Interference Test (SIT), a cognitive stress memory paradigm which taps proactive and retroactive semantic interference, for predicting progression from mild cognitive impairment (MCI) to dementia in both a clinical and a population-based sample. METHODS: Participants with MCI in the clinical (n = 184) and population-based (n = 435) samples were followed for up to four years...
January 16, 2018: International Psychogeriatrics
https://www.readbyqxmd.com/read/29314772/the-contribution-of-executive-control-to-semantic-cognition-convergent-evidence-from-semantic-aphasia-and-executive-dysfunction
#15
Hannah E Thompson, Azizah Almaghyuli, Krist A Noonan, Ohr Barak, Matthew A Lambon Ralph, Elizabeth Jefferies
Semantic cognition, as described by the controlled semantic cognition (CSC) framework (Rogers et al., , Neuropsychologia, 76, 220), involves two key components: activation of coherent, generalizable concepts within a heteromodal 'hub' in combination with modality-specific features (spokes), and a constraining mechanism that manipulates and gates this knowledge to generate time- and task-appropriate behaviour. Executive-semantic goal representations, largely supported by executive regions such as frontal and parietal cortex, are thought to allow the generation of non-dominant aspects of knowledge when these are appropriate for the task or context...
January 3, 2018: Journal of Neuropsychology
https://www.readbyqxmd.com/read/29307083/in-thai-nationals-the-apoe4-allele-affects-multiple-domains-of-neuropsychological-biobehavioral-and-social-functioning-thereby-contributing-to-alzheimer-s-disorder-while-the-apoe3-allele-protects-against-neuropsychiatric-symptoms-and-psychosocial-deficits
#16
Sookjaroen Tangwongchai, Thitiporn Supasitthumrong, Solaphat Hemrunroj, Chavit Tunvirachaisakul, Phenphichcha Chuchuen, Natnicha Houngngam, Thiti Snabboon, Ittipol Tawankanjanachot, Yuthachai Likitchareon, Kamman Phanthumchindad, Michael Maes
The apolipoprotein E epsilon 4 (ApoE4) allele is the strongest genetic risk factor for Alzheimer's disorder (AD) and is associated with semantic and episodic memory deficits. The aim of this study was to examine the associations between ApoE alleles (E2, E3, E4) and genotypes and neuropsychological tests, behavioral functions, and dementia symptoms as assessed using Consortium to Establish a Registry for Alzheimer's Disease (CERAD). This study included 60 patients with Alzheimer's disorder (AD), 60 with mild cognitive disorder (MCI), and 62 normal volunteers...
January 6, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29289335/cognitive-consequences-of-the-left-right-asymmetry-of-atrophy-in-semantic-dementia
#17
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/29246541/autobiographical-memory-the-ageing-brain-and-mechanisms-of-psychological-interventions
#18
REVIEW
Andrew P Allen, Caoilainn Doyle, Seán Commins, Richard A P Roche
Elucidating the impact of healthy cognitive ageing and dementia on autobiographical memory (AM) may help deepen our theoretical understanding of memory and underlying neural changes. The distinction between episodic and semantic autobiographical memory is particularly informative in this regard. Psychological interventions, particularly those involving reminiscence or music, have led to differential effects on episodic and semantic autobiographical memory. We propose that executive function is a key mediator of psychological therapies on autobiographical memory...
December 12, 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/29235432/impact-of-informal-caregiving-on-cognitive-function-and-well-being-in-canada
#19
Sasha Mallya, Alexandra J Fiocco
BACKGROUND: With a rise in the aging population and a consequential rise in persons diagnosed with dementia comes an increase in the number of informal caregivers who are caring for a loved one. The objective of the proposed study was to assess the neurocognitive and psychological effects of caring for a person with dementia or a related neurodegenerative disease in a sample of Canadian informal caregivers. METHODS: Fifty-seven informal caregivers of a person with dementia or a related neurodegenerative disease (mean age = 66...
December 13, 2017: International Psychogeriatrics
https://www.readbyqxmd.com/read/29228211/asymmetry-of-post-mortem-neuropathology-in-behavioural-variant-frontotemporal-dementia
#20
David J Irwin, Corey T McMillan, Sharon X Xie, Katya Rascovsky, Vivianna M Van Deerlin, H Branch Coslett, Roy Hamilton, Geoffrey K Aguirre, Edward B Lee, Virginia M Y Lee, John Q Trojanowski, Murray Grossman
Antemortem behavioural and anatomic abnormalities have largely been associated with right hemisphere disease in behavioural-variant frontotemporal dementia, but post-mortem neuropathological examination of bilateral hemispheres remains to be defined. Here we measured the severity of post-mortem pathology in both grey and white matter using a validated digital image analysis method in four cortical regions sampled from each hemisphere in 26 patients with behavioural-variant frontotemporal dementia, including those with frontotemporal degeneration (i...
January 1, 2018: Brain: a Journal of Neurology
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