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Episodic memory

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https://www.readbyqxmd.com/read/29028935/latent-profile-analysis-reveals-behavioral-and-brain-correlates-of-dopamine-cognition-associations
#1
Martin Lövdén, Nina Karalija, Micael Andersson, Anders Wåhlin, Jan Axelsson, Ylva Köhncke, Lars S Jonasson, Anna Rieckman, Goran Papenberg, Douglas D Garrett, Marc Guitart-Masip, Alireza Salami, Katrine Riklund, Lars Bäckman, Lars Nyberg, Ulman Lindenberger
Evidence suggests that associations between the neurotransmitter dopamine and cognition are nonmonotonic and open to modulation by various other factors. The functional implications of a given level of dopamine may therefore differ from person to person. By applying latent-profile analysis to a large (n = 181) sample of adults aged 64-68 years, we probabilistically identified 3 subgroups that explain the multivariate associations between dopamine D2/3R availability (probed with 11C-raclopride-PET, in cortical, striatal, and hippocampal regions) and cognitive performance (episodic memory, working memory, and perceptual speed)...
September 25, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29028135/predicting-episodic-and-spatial-memory-performance-from-hippocampal-resting-state-functional-connectivity-evidence-for-an-anterior-posterior-division-of-function
#2
Jonas Persson, Eva Stening, Kristin Nordin, Hedvig Söderlund
fMRI studies have identified distinct resting-state functional connectivity (RSFC) networks associated with the anterior and posterior hippocampus. However, the functional relevance of these two networks is still largely unknown. Hippocampal lesion studies and task-related fMRI point to a role for the anterior hippocampus in non-spatial episodic memory and the posterior hippocampus in spatial memory. We used Relevance Vector Regression (RVR), a machine-learning method that enables predictions of continuous outcome measures from multivariate patterns of brain imaging data, to test the hypothesis that patterns of whole-brain RSFC associated with the anterior hippocampus predict episodic memory performance, while patterns of whole-brain RSFC associated with the posterior hippocampus predict spatial memory performance...
October 13, 2017: Hippocampus
https://www.readbyqxmd.com/read/29027613/both-decreased-akt-expression-and-mtor-phosphorylation-are-related-to-decreased-neuronal-differentiation-in-the-hippocampal-alveus-of-aged-mice
#3
Bing Chun Yan, Dan Jiang, Jie Wang, Yuanyuan Zhang, Xiaolu Zhu, Pei Xu, Xing Yu, Moo-Ho Won, Pei Qing Su
BACKGROUND: Aging is an inevitable process which results in many changes. These changes are closely related to the hippocampus which is in charge of long-term learning and episodic memory. AIM: This study was to investigate age-related changes of the cell proliferation, neuroblast differentiation and Akt/mTOR signaling in the hippocampal alveus of aged mice. METHODS: In the present study, we compared the differences of neurogenesis in the hippocampal alveus between adult (postnatal month 6) and aged (postnatal month 24) mice using immunohistochemistry and western blot analysis...
October 13, 2017: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/29020530/doctor-should-i-use-computer-games-to-prevent-dementia
#4
Deirdre M O'Shea, Liselotte De Wit, Glenn E Smith
Commercial advertising of computerized "brain games" may result in clinicians being asked whether brain games prevent dementia. To address this question, we conducted a review of computerized cognitive training (CCT) interventions in older adults with Mild Cognitive Impairment (MCI). Studies were identified using a PubMed and PSYCinfo search for review articles. Within 11 review articles we identified 15 unique studies. Nine of these studies used commercially available "brain games" as their primary CCT intervention...
August 23, 2017: Clinical Gerontologist
https://www.readbyqxmd.com/read/28993958/functional-evaluation-of-an-ikbkg-variant-suspected-to-cause-immunodeficiency-without-ectodermal-dysplasia
#5
Glynis Frans, Jutte van der Werff Ten Bosch, Leen Moens, Rik Gijsbers, Majid Changi-Ashtiani, Hassan Rokni-Zadeh, Mohammad Shahrooei, Greet Wuyts, Isabelle Meyts, Xavier Bossuyt
Hypomorphic IKBKG mutations in males are typically associated with anhidrotic ectodermal dysplasia with immunodeficiency (EDA-ID). Some mutations cause immunodeficiency without EDA (NEMO-ID). The immunological profile associated with these NEMO-ID variants is not fully documented. We present a 2-year-old patient with suspected immunodeficiency in which a hemizygous p.Glu57Lys IKBKG variant was identified. At the age of 1 year, he had an episode of otitis media that evolved into a bilateral mastoiditis (Pseudomonas spp)...
October 10, 2017: Journal of Clinical Immunology
https://www.readbyqxmd.com/read/28993814/a-dopamine-receptor-genetic-variant-enhances-perceptual-speed-in-cognitive-healthy-subjects
#6
S Barral, C Habeck, E Gazes, P L De Jager, D A Bennett, Y Stern
Cognition is under strong genetic control, yet the specific genes are unknown. To investigate genetic influences on specific cognitive domains, 153 cognitive healthy subjects of European ancestry from the Reference Abilities Study (RANN) were genotyped for 1,160 variants within 446 neuropsychiatric genes. Adjusted linear regression models evaluated the association between the genetic variants and four reference abilities, which capture variance in age-related cognitive function (Vocabulary, Episodic Memory, Perceptual Speed, and Reasoning)...
June 2017: Alzheimer's & Dementia: Translational Research & Clinical Interventions
https://www.readbyqxmd.com/read/28993004/cerebral-amyloid-angiopathy-related-cognitive-impairment-the-search-for-a-specific-neuropsychological-pattern
#7
REVIEW
M Planton, N Raposo, J-F Albucher, J Pariente
Cerebral amyloid angiopathy is diagnosed in stroke units after lobar intracerebral hemorrhage. CAA can also be diagnosed in memory clinics when patients are referred for cognitive impairment assessment, and may be a reason for admission to emergency or neurology departments because of rapidly progressive cognitive or neurological decline, or a transient focal neurological episode. CAA may even be observed in older community-dwelling individuals. Neuropsychological impairment in CAA has been described over the past 20 years...
October 6, 2017: Revue Neurologique
https://www.readbyqxmd.com/read/28992530/effects-of-different-antihypertensive-medication-groups-on-cognitive-function-in-older-patients-a-systematic-review
#8
M Stuhec, J Keuschler, J Serra-Mestres, M Isetta
BACKGROUND: Chronic hypertension has been associated with an increased risk of cognitive decline. Although a link between hypertension and cognitive decline has been established, there is less evidence supported by systematic reviews. The main aim was to compare different antihypertensive drug groups in relation to their effect on cognition in older patients without established dementia using a systematic review. METHOD: A systematic search in Medline and Embase through to January 2017 was used to identify randomized controlled clinical trials (RCTs) studying the impact of different antihypertensives on cognition in older patients without dementia...
August 15, 2017: European Psychiatry: the Journal of the Association of European Psychiatrists
https://www.readbyqxmd.com/read/28988860/theta-phase-synchronization-is-the-glue-that-binds-human-associative-memory
#9
Andrew Clouter, Kimron L Shapiro, Simon Hanslmayr
Episodic memories are information-rich, often multisensory events that rely on binding different elements [1]. The elements that will constitute a memory episode are processed in specialized but distinct brain modules. The binding of these elements is most likely mediated by fast-acting long-term potentiation (LTP), which relies on the precise timing of neural activity [2]. Theta oscillations in the hippocampus orchestrate such timing as demonstrated by animal studies in vitro [3, 4] and in vivo [5, 6], suggesting a causal role of theta activity for the formation of complex memory episodes, but direct evidence from humans is missing...
October 4, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28986549/is-long-term-exposure-to-air-pollution-associated-with-episodic-memory-a-longitudinal-study-from-northern-sweden
#10
Anna Oudin, Bertil Forsberg, Nina Lind, Steven Nordin, Daniel Oudin Åström, Anna Sundström, Maria Nordin
Associations between long-term exposure to ambient air pollution and cognitive function have been observed in a few longitudinal studies. Our aim was to investigate the association between long-term exposure to air pollution and episodic memory, a marker of early cognitive decline. We used data from the Betula study in Northern Sweden, and included participants 60 to 85 of age at inclusion, 1,469 persons in total. The participants were followed for up to 22 years, five years apart between 1988 and 2010. A composite of five tasks was used as a measure of episodic memory measure (EMM), and the five-year change in EMM score (ΔEMM) was calculated such that a participant could contribute with up to four measurement pairs...
October 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28986416/subjective-cognitive-decline-and-%C3%AE-amyloid-burden-predict-cognitive-change-in-healthy-elderly
#11
Jacob W Vogel, Monika Varga Doležalová, Renaud La Joie, Shawn M Marks, Henry D Schwimmer, Susan M Landau, William J Jagust
OBJECTIVE: To assess in a longitudinal study whether subjective cognitive decline (SCD) and brain β-amyloid (Aβ) contribute unique information to cognitive decline. METHODS: One hundred thirty-six healthy elderly from the Berkeley Aging Cohort Study were followed up for a mean of 4 years. SCD and affective measures were generated from the Geriatric Depression Scale (GDS) with factor analysis on data from a larger set of 347 healthy, nondepressed (GDS <11) elderly individuals...
October 6, 2017: Neurology
https://www.readbyqxmd.com/read/28986084/on-the-functional-significance-of-retrieval-mode-task-switching-disrupts-the-recollection-of-conceptual-stimulus-information-from-episodic-memory
#12
Kristina Küper
Episodic memory retrieval is assumed to be associated with the tonic cognitive state of retrieval mode. Despite extensive research into the neurophysiological correlates of retrieval mode, as of yet, relatively little is known about its functional significance. The present event-related potential (ERP) study was aimed at examining the impact of retrieval mode on the specificity of memory content retrieved in the course of familiarity and recollection processes. In two experiments, participants performed a recognition memory inclusion task in which they had to distinguish identically repeated and re-colored versions of study items from new items...
October 3, 2017: Brain Research
https://www.readbyqxmd.com/read/28984597/cognitive-change-in-rehabilitation-patients-with-dementia-prevalence-and-association-with-rehabilitation-success
#13
Ilona Dutzi, Michael Schwenk, Marietta Kirchner, Jürgen M Bauer, Klaus Hauer
BACKGROUND: Dementia is a frequent diagnosis in geriatric rehabilitation. Studies in patients with dementia on the development of their cognitive status during rehabilitation and its relation to functional outcomes have been scarce. OBJECTIVES: To describe the changes in cognitive status in patients with dementia during inpatient rehabilitation and to determine its association with patient characteristics and rehabilitation outcome. METHODS: Cohort study in a geriatric rehabilitation center with data collection at admission and discharge...
2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28984585/memory-correlates-of-alzheimer-s-disease-cerebrospinal-fluid-markers-a-longitudinal-cohort-study
#14
Babette L R Reijs, Inez H G B Ramakers, Sebastian Köhler, Charlotte E Teunissen, Marleen Koel-Simmelink, Pradeep J Nathan, Magda Tsolaki, Lars-Olof Wahlund, Gunhild Waldemar, Lucrezia Hausner, Rik Vandenberghe, Peter Johannsen, Andrew Blackwell, Hugo Vanderstichele, Frans Verhey, Pieter Jelle Visser
BACKGROUND: Performance on episodic, semantic, and working memory tests is impaired in Alzheimer's disease (AD)-type dementia, but it is unclear which type of memory test is most strongly associated with early AD biomarkers in cerebrospinal fluid (CSF), and most useful for monitoring disease progression. OBJECTIVE: To examine the association between amyloid-β 1-42 (Aβ42) and tau in CSF with performance on different memory domains at baseline, and how these CSF markers are related with memory decline...
2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28984578/process-specific-analysis-in-episodic-memory-retrieval-using-fast-optical-signals-and-hemodynamic-signals-in-the-right-prefrontal-cortex
#15
Dong Sunghee, Jichai Jeong
Memory is formed by the interaction of various brain functions at the item and task level. Revealing individual and combined effects of item- and task-related processes on retrieving episodic memory is an unsolved problem because of limitations in existing neuroimaging techniques. To investigate these issues, we analyze fast and slow optical signals measured from a custom-built continuous wave functional near-infrared spectroscopy (CW-fNIRS) system. In our work, we visually encode the words to the subjects and let them recall the words after a short rest...
October 6, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28984525/brain-networks-related-to-beta-oscillatory-activity-during-episodic-memory-retrieval
#16
Erika Nyhus
Evidence from fMRI has consistently located a widespread network of frontal, parietal, and temporal lobe regions during episodic retrieval. However, the temporal limitations of the fMRI methodology have made it difficult to assess the transient network dynamics by which these distributed regions coordinate activity. Recent evidence suggests that beta oscillations (17-20 Hz) are important for top-down control for memory suppression. However, the spatial limitations of the EEG methodology make it difficult to assess the relationship between these oscillatory signals and the distributed networks identified with fMRI...
October 6, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28981917/aberrant-default-mode-network-hippocampus-connectivity-after-sad-memory-recall-in-remitted-depression
#17
Caroline A Figueroa, Roel J T Mocking, Guido van Wingen, Suzanne Martens, Henricus G Ruhé, Aart H Schene
Rumination and cognitive reactivity (dysfunctional cognitions after sad mood-induction) remain high in remitted Major Depressive Disorder (MDD) and can contribute to new episodes. These factors have been linked to increased fMRI resting-state functional-connectivity within the Default-Mode Network (DMN). It remains unclear whether (I) increased DMN-connectivity persists during MDD-remission, and (II) whether sad mood-induction differentially affects DMN-connectivity in remitted-MDD versus controls. Moreover, DMN-connectivity studies in remitted-MDD were previously confounded by antidepressant-use...
September 13, 2017: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/28981226/-balance-disorders
#18
C Van Nechel
Balance disorders may result from an impairment of one of the sensorial modalities involved in the perception of the self-location in space: vestibular, proprioception and vision, a deficit of the neuronal multisensorial integration, a less effective motor or loco-motor system, the medication side effects or psychological interferences. The basic examination of a dizzy patient implies the assessment of these different aspects. The balance is not restricted to à set of reflexes. It is a distinctive expression of the sixth sense : the sense of orientation...
2017: Revue Médicale de Bruxelles
https://www.readbyqxmd.com/read/28979205/atrophy-of-the-posterior-subiculum-is-associated-with-memory-impairment-tau-and-a%C3%AE-pathology-in-non-demented-individuals
#19
Olof Lindberg, Gustav Mårtensson, Erik Stomrud, Sebastian Palmqvist, Lars-Olof Wahlund, Eric Westman, Oskar Hansson
Alzheimer's disease (AD) is associated with atrophy of the cornu ammonis (CA) 1 and the subiculum subfield of the hippocampus (HC), and with deficits in episodic memory and spatial orientation. These deficits are mainly associated with the functionality of the posterior HC. We therefore hypothesized that key AD pathologies, i.e., β-amyloid and tau pathology would be particularly associated with the volume of the posterior subiculum in non-demented individuals. In our study we included 302 cognitively normal elderly participants (CN), 183 patients with subjective cognitive decline (SCD) and 171 patients with amnestic mild cognitive impairment (MCI), all of whom underwent 3T magnetic resonance images (MRI)...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28979196/speed-and-oscillations-medial-septum-integration-of-attention-and-navigation
#20
REVIEW
Marian Tsanov
Several cortical and diencephalic limbic brain regions incorporate neurons that fire in correlation with the speed of whole-body motion, also known as linear velocity. Besides the field mapping and head-directional information, the linear velocity is among the major signals that guide animal's spatial navigation. Large neuronal populations in the same limbic regions oscillate with theta rhythm during spatial navigation or attention episodes; and the frequency of theta also correlates with linear velocity. A functional similarity between these brain areas is that their inactivation impairs the ability to form new spatial memories; whereas an anatomical similarity is that they all receive projections from medial septum-diagonal band of Broca complex...
2017: Frontiers in Systems Neuroscience
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