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https://www.readbyqxmd.com/read/28319835/convergent-and-divergent-effects-of-apolipoprotein-e-%C3%AE%C2%B54-and-%C3%AE%C2%B52-alleles-on-amygdala-functional-networks-in-nondemented-older-adults
#1
Liang Gong, Hao Shu, Cancan He, Qing Ye, Feng Bai, Chunming Xie, Zhijun Zhang
Traditionally, in the context of Alzheimer's disease, the apolipoprotein E ε2 (APOEε2) allele is a protective factor and the APOEε4 allele is a destructive factor. However, this inverse relationship has recently been challenged, and the neural mechanisms underlying the effects of APOE genotype on Alzheimer's disease remain unclear. A resting-state functional magnetic resonance imaging study was conducted to investigate the effects of APOE genotype and age on amygdala functional connectivity (AFC) networks in 84 patients with amnestic mild cognitive impairment and 124 cognitively normal order adults...
February 24, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28315366/amygdala-functional-connectivity-is-associated-with-locus-of-control-in-the-context-of-cognitive-aging
#2
Ping Ren, Mia Anthony, Benjamin P Chapman, Kathi Heffner, Feng Lin
Locus of control (LOC) measures the extent to which individuals perceive control over their lives. Those with a more "internal" LOC feel self-sufficient and able to determine important aspects of their own future, while those with a more "external" LOC feel that their lives are governed by events beyond their control. Reduced internal LOC and increased external LOC have been found in cognitive disorders, but the neural substrates of these control perceptions are yet unknown. In the present study, we explored the relationship between amygdala functional connectivity and LOC in 18 amnestic mild cognitive impairment (MCI) and age-, sex-, and education-matched, 22 cognitively healthy controls (HC)...
March 14, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28314160/difference-in-imaging-biomarkers-of-neurodegeneration-between-early-and-late-onset-amnestic-alzheimer-s-disease
#3
Anne-Laure Aziz, Bernard Giusiano, Sven Joubert, Lauréline Duprat, Mira Didic, Claude Gueriot, Lejla Koric, José Boucraut, Olivier Felician, Jean-Philippe Ranjeva, Eric Guedj, Mathieu Ceccaldi
Neuroimaging biomarkers differ between patients with early-onset Alzheimer's disease (EOAD) and late-onset Alzheimer's disease (LOAD). Whether these changes reflect cognitive heterogeneity or differences in disease severity is still unknown. This study aimed at investigating changes in neuroimaging biomarkers, according to the age of onset of the disease, in mild amnestic Alzheimer's disease patients with positive amyloid biomarkers in cerebrospinal fluid. Both patient groups were impaired on tasks assessing verbal and visual recognition memory...
February 21, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28304300/a-novel-method-for-direct-assessment-of-everyday-competence-among-older-adults
#4
Sara J Czaja, David A Loewenstein, Samir A Sabbag, Rosie E Curiel, Elizabeth Crocco, Philip D Harvey
BACKGROUND: Recent findings indicate that impairments in functional performance do occur among individuals diagnosed with mild cognitive impairment (MCI). Most assessment strategies for everyday competence are associated with challenges with reliability, are typically in paper and pencil format, or require in-person administration by a trained professional. OBJECTIVE: This paper reports on a novel technology-based assessment battery of everyday competence that includes ecologically valid simulations of daily activities important to independence...
March 10, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28304289/episodic-memory-dysfunction-in%C3%A2-behavioral-variant-frontotemporal-dementia-a-clinical-and-fdg-pet-study
#5
Marta Fernández-Matarrubia, Jordi A Matías-Guiu, María Nieves Cabrera-Martín, Teresa Moreno-Ramos, María Valles-Salgado, José Luis Carreras, Jorge Matías-Guiu
BACKGROUND: Episodic memory disturbance is still considered as an exclusion criterion for behavioral variant frontotemporal dementia (bvFTD), but growing evidence suggests that memory can be impaired. OBJECTIVE: Our main purposes were to assess episodic memory in a group of bvFTD patients comparatively with Alzheimer's disease (AD) patients, and analyze the relationship between episodic memory and brain metabolism measured using positron emission tomography imaging with 18F-fluorodeoxyglucose (FDG-PET)...
March 10, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28299814/functional-neuroanatomical-associations-of-working-memory-in-early-onset-alzheimer-s-disease
#6
Christopher Kobylecki, Cathleen Haense, Jennifer M Harris, Cheryl L Stopford, Shailendra H Segobin, Matthew Jones, Anna M T Richardson, Alexander Gerhard, José Anton-Rodriguez, Jennifer C Thompson, Karl Herholz, Julie S Snowden
OBJECTIVE: To characterize metabolic correlates of working memory impairment in clinically defined subtypes of early-onset Alzheimer's disease. BACKGROUND: Established models of working memory suggest a key role for frontal lobe function, yet the association in Alzheimer's disease between working memory impairment and visuospatial and language symptoms suggests that temporoparietal neocortical dysfunction may be responsible. METHODS: Twenty-four patients with predominantly early-onset Alzheimer's disease were clinically classified into groups with predominantly amnestic, multidomain or visual deficits...
March 16, 2017: International Journal of Geriatric Psychiatry
https://www.readbyqxmd.com/read/28287976/network-optimization-of-functional-connectivity-within-default-mode-network-regions-to-detect-cognitive-decline
#7
Wanpracha Art Chaovalitwongse, Daehan Won, Onur Seref, Paul Borghesani, Mary Katie Askren, Sherry Willis, Tom Grabowski
The rapid aging of the world's population is causing an increase in the prevalence of cognitive decline and degenerative brain disease in the elderly. Current diagnoses of amnestic and nonamnestic Mild Cognitive Impairment (MCI), which may represent early stage Alzheimer's disease or related degenerative conditions, are based on clinical grounds. The recent emergence of advanced network analyses of functional Magnetic Resonance Imaging (fMRI) data taken at cognitive rest has provided insight that declining functional connectivity of the default mode network (DMN) may be correlated with neurological disorders, and particularly prodromal Alzheimer's disease...
March 7, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28282806/abnormalities-of-cerebral-deep-medullary-veins-on-7-tesla-mri-in-amnestic-mild-cognitive-impairment-and-early-alzheimer-s-disease-a-pilot-study
#8
Willem H Bouvy, Hugo J Kuijf, Jaco J M Zwanenburg, Huiberdina L Koek, L Jaap Kappelle, Peter R Luijten, M Kamran Ikram, Geert Jan Biessels
Cerebral small vessel disease (SVD) contributes to cognitive impairment and dementia. SVD may affect veins, but veins are difficult to detect with 1.5 and 3T MRI. We compared deep medullary veins (DMVs) visualized on 7T-MRI between patients with early Alzheimer's sisease (eAD; n = 17) or amnestic MCI (aMCI; n = 12) and controls (n = 40). The number and density of DMVs was similar in patients and controls, but tortuosity was higher in eAD (Cohen's d = 0.7, 95% CI: 0.1-1.2, p = 0.02) and aMCI (Cohen's d = 0...
March 6, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28282071/-new-predictors-in-prodromal-alzheimer-deferred-phase-in-word-recall-of-mis-test
#9
Edith Labos, Sofía Trojanowski, Marcelo Schapira, Daniel Seinhart, Alejandro Renato
BACKGROUND: The Memory Impairment Screen (MIS-A) is a validated test to detect Alzheimer's Disease (AD) and other dementias. We have modified this test to suit a Spanish speaking population and added a new component, delayed recall (MIS-D). OBJECTIVES: 1) To test a Spanish version of MIS-A and MIS-D. 2) To assess the discriminative validity of MIS-D as a screening tool for the amnestic variant of Mild Cognitive Impairment (aMCI). METHODS: A case-control study of a cohort of 739 aged 65 years old and over, of whom 436 were healthy controls and 303 had a diagnosis of aMCI...
September 2016: Vertex: Revista Argentina de Psiquiatriá
https://www.readbyqxmd.com/read/28275349/neuroanatomical-and-neuropsychological-markers-of-amnestic-mci-a-three-year-longitudinal-study-in-individuals-unaware-of-cognitive-decline
#10
Katharina S Goerlich, Mikhail Votinov, Ellen Dicks, Sinika Ellendt, Gábor Csukly, Ute Habel
Structural brain changes underlying mild cognitive impairment (MCI) have been well-researched, but most previous studies required subjective cognitive complaints (SCC) as a diagnostic criterion, diagnosed MCI based on a single screening test or lacked analyses in relation to neuropsychological impairment. This longitudinal voxel-based morphometry study aimed to overcome these limitations: The relationship between regional gray matter (GM) atrophy and behavioral performance was investigated over the course of 3 years in individuals unaware of cognitive decline, identified as amnestic MCI based on an extensive neuropsychological test battery...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28274963/mri-based-comparative-study-of-different-mild-cognitive-impairment-subtypes-protocol-for-an-observational-case-control-study
#11
Yang Yu, Weina Zhao, Siou Li, Changhao Yin
INTRODUCTION: Amnestic mild cognitive impairment (aMCI) and vascular mild cognitive impairment (VaMCI) comprise the 2 main types of mild cognitive impairment (MCI). The first condition generally progresses to Alzheimer's disease, whereas the second is likely to develop into vascular dementia (VD). The brain structure and function of patients with MCI differ from those of normal elderly individuals. However, whether brain structures or functions differ between these 2 MCI subtypes has not been studied...
March 8, 2017: BMJ Open
https://www.readbyqxmd.com/read/28270249/errors-on-the-moca-s-animal-naming-findings-from-parkinson-s-disease-patients
#12
Yassar Alamri, Tim Anderson, John Dalrymple-Alford, Michael Macaskill
We read the findings by Cecato et al. (2016) with great interest. In their study, naming the rhinoceros discriminated between patients with amnestic mild cognitive impairment (aMCI) and Alzheimer's disease (AD) but not healthy controls (HC). Of note, HC participants were significantly younger than aMCI and AD patients. All participants were administered the original version of the Montreal Cognitive Assessment (MoCA) instrument.
March 8, 2017: International Psychogeriatrics
https://www.readbyqxmd.com/read/28269787/cognitive-composites-domain-scores-related-to-neuroimaging-biomarkers-within-probable-amnestic-mild-cognitive-impairment-storage-subtype
#13
Ana Espinosa, Montserrat Alegret, Pedro Pesini, Sergi Valero, Asunción Lafuente, Mar Buendía, Itziar San José, Marta Ibarria, Miguel A Tejero, Joan Giménez, Susana Ruiz, Isabel Hernández, Francesc Pujadas, Pablo Martínez-Lage, Josep Munuera, Javier Arbizu, Lluis Tárraga, Suzanne B Hendrix, Agustín Ruiz, James T Becker, Susan M Landau, Oscar Sotolongo-Grau, Manuel Sarasa, Mercè Boada
The probable-amnestic (Pr-a) mild cognitive impairment (MCI)-storage subtype is a phenotype with 8.5 times more risk of conversion to dementia, mainly Alzheimer's disease (AD), than the possible non-amnestic (Pss-na) MCI. The aim of this study was to find the optimized cognitive composites (CCs) domain scores most related to neuroimaging biomarkers within Pr-aMCI-storage subtype patients. The Fundació ACE (ACE) study with 20 Pr-aMCI-storage subtype subjects (MCI) were analyzed. All subjects underwent a neuropsychological assessment, a structural MRI, FDG-PET, and PIB-PET...
February 25, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28253275/impact-of-frontal-white-matter-hyperintensity-on-instrumental-activities-of-daily-living-in-elderly-women-with-alzheimer-disease-and-amnestic-mild-cognitive-impairment
#14
Noriko Ogama, Takashi Sakurai, Toshiharu Nakai, Shumpei Niida, Naoki Saji, Kenji Toba, Hiroyuki Umegaki, Masafumi Kuzuya
BACKGROUND: Instrumental activities of daily living (IADL) start to decline during the progression of amnestic mild cognitive impairment (aMCI) to Alzheimer disease (AD). Cognitive and physical decline are involved in the loss of functional independence. However, little is known about AD-related neural change that leads to IADL impairment. The purpose of this study was to clarify the effects of regional white matter hyperintensity (WMH) on IADL impairment in persons with AD and aMCI. METHODS: The participants were 347 female subjects aged 65-85 years diagnosed with AD (n = 227), aMCI (n = 44) or normal cognition (n = 76)...
2017: PloS One
https://www.readbyqxmd.com/read/28245935/the-use-of-metacognitive-strategies-to-decrease-false-memories-in-source-monitoring-in-patients-with-mild-cognitive-impairment
#15
Rebecca G Deason, Neil A Nadkarni, Michelle J Tat, Sean Flannery, Bruno Frustace, Brandon A Ally, Andrew E Budson
Patients with amnestic mild cognitive impairment (MCI) and Alzheimer's disease (AD) often demonstrate high rates of false memories, leading to stressful and frustrating situations for both patients and caregivers in everyday life. Sometimes these false memories are due to failures in monitoring the source of the information. In the current study, we examined interventions aimed to enhance the use of the metacognitive "recall-to-reject" memory strategy. Such interventions could improve source memory and decrease false memory in patients with MCI...
February 3, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28243501/validation-of-olfactory-deficit-as-a-biomarker-of-alzheimer-disease
#16
Matthew R Woodward, Chaitanya V Amrutkar, Harshit C Shah, Ralph H B Benedict, Sanjanaa Rajakrishnan, Rachelle S Doody, Li Yan, Kinga Szigeti
BACKGROUND: We evaluated smell identification as a biomarker for Alzheimer disease (AD) by assessing its utility in differentiating normal aging from an amnestic disorder and determining its predictive value for conversion from amnestic mild cognitive impairment (aMCI) to AD. METHODS: Cross-sectional study (AD = 262, aMCI = 110, controls = 194) measuring smell identification (University of Pennsylvania Smell Identification Test [UPSIT]) and cognitive status was performed, as well as longitudinal analysis of aMCI participants (n = 96) with at least 1 year follow-up (mean 477...
February 2017: Neurology. Clinical Practice
https://www.readbyqxmd.com/read/28238814/neural-basis-of-cognitive-assessment-in-alzheimer-disease-amnestic-mild-cognitive-impairment-and-subjective-memory-complaints
#17
Jordi A Matías-Guiu, María Nieves Cabrera-Martín, María Valles-Salgado, Alicia Pérez-Pérez, Teresa Rognoni, Teresa Moreno-Ramos, José Luis Carreras, Jorge Matías-Guiu
INTRODUCTION: Interpreting cognitive tests is often challenging. The same test frequently examines multiple cognitive functions, and the functional and anatomical basis underlying test performance is unknown in many cases. This study analyses the correlation of different neuropsychological test results with brain metabolism in a series of patients evaluated for suspected Alzheimer disease. METHODS: 20 healthy controls and 80 patients consulting for memory loss were included, in which cognitive study and (18)F-fluorodeoxyglucose PET were performed...
February 3, 2017: American Journal of Geriatric Psychiatry
https://www.readbyqxmd.com/read/28236606/physical-function-differences-between-the-stages-from-normal-cognition-to-moderate-alzheimer-disease
#18
Chisato Fujisawa, Hiroyuki Umegaki, Kazushi Okamoto, Hirotaka Nakashima, Masafumi Kuzuya, Kenji Toba, Takashi Sakurai
OBJECTIVES: We investigated the differences in the physical function test results across stages from normal cognition (NC) to moderate Alzheimer disease (AD) and how risk factors of physical function decline are correlated with the physical function test results. DESIGN: A cross-sectional study of outpatients at the Memory Disorder Outpatient Center of Japan's National Center of Geriatrics and Gerontology. PARTICIPANTS: We enrolled 882 individuals aged ≥65 diagnosed with NC (n = 210), amnestic mild cognitive impairment (aMCI; n = 273), mild AD (n = 181) or moderate AD (n = 197)...
February 21, 2017: Journal of the American Medical Directors Association
https://www.readbyqxmd.com/read/28236166/alteration-of-regional-homogeneity-and-white-matter-hyperintensities-in-amnestic-mild-cognitive-impairment-subtypes-are-related-to-cognition-and-csf-biomarkers
#19
Xiao Luo, Yerfan Jiaerken, Peiyu Huang, Xiao Jun Xu, Tiantian Qiu, Yunlu Jia, Zhujing Shen, Xiaojun Guan, Jiong Zhou, Minming Zhang
Amnestic mild cognitive impairment can be further classified as single-domain aMCI (SD-aMCI) with isolated memory deficit, or multi-domain aMCI (MD-aMCI) if memory deficit is combined with impairment in other cognitive domains. Prior studies reported these clinical subtypes presumably differ in etiology. Thus, we aimed to explore the possible mechanisms between different aMCI subtypes by assessing alteration in brain activity and brain vasculature, and their relations with CSF AD biomarkers. 49 healthy controls, 32 SD-aMCI, and 32 MD-aMCI, who had undergone structural scans, resting-state functional MRI (rsfMRI) scans and neuropsychological evaluations, were identified...
February 24, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28212570/altered-amygdala-and-hippocampus-effective-connectivity-in-mild-cognitive-impairment-patients-with-depression-a-resting-state-functional-mr-imaging-study-with-granger-causality-analysis
#20
Li Juan Zheng, Gui Fen Yang, Xin Yuan Zhang, Yun Fei Wang, Ya Liu, Gang Zheng, Guang Ming Lu, Long Jiang Zhang, Ying Han
Neuroimaging studies have demonstrated that the major depression disorder would increase the risk of dementia in the older with amnestic cognitive impairment. We used granger causality analysis algorithm to explore the amygdala- and hippocampus-based directional connectivity patterns in 12 patients with major depression disorder and amnestic cognitive impairment (mean age: 69.5 ± 10.3 years), 13 amnestic cognitive impairment patients (mean age: 72.7 ± 8.5 years) and 14 healthy controls (mean age: 64.7 ± 7...
February 15, 2017: Oncotarget
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