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https://www.readbyqxmd.com/read/28329381/the-effects-of-an-afternoon-nap-on-episodic-memory-in-young-and-older-adults-napping-and-aging
#1
Michael K Scullin, Jacqueline Fairley, Michael J Decker, Donald L Bliwise
Study Objectives: In young adults, napping is hypothesized to benefit episodic memory retention (e.g., via consolidation). Whether this relationship is present in older adults has not been adequately tested, but is an important question because older adults display marked changes in sleep and memory. Design: Between-subjects design. Setting: Sleep laboratory at Emory University School of Medicine. Participants: 50 healthy young adults (18-29) and 45 community dwelling older adults (58-83)...
March 1, 2017: Sleep
https://www.readbyqxmd.com/read/28324703/arousal-amplifies-biased-competition-between-high-and-low-priority-memories-more-in-women-than-in-men-the-role-of-elevated-noradrenergic-activity
#2
David Clewett, Michiko Sakaki, Ringo Huang, Shawn E Nielsen, Mara Mather
Recent findings indicate that emotional arousal can enhance memory consolidation of goal-relevant stimuli while impairing it for irrelevant stimuli. According to one recent model, these goal-dependent memory tradeoffs are driven by arousal-induced release of norepinephrine (NE), which amplifies neural gain in target sensory and memory processing brain regions. Past work also shows that ovarian hormones modulate activity in the same regions thought to support NE's effects on memory, such as the amygdala, suggesting that men and women may be differentially susceptible to arousal's dual effects on episodic memory...
February 24, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28324066/hippocampal-aromatization-modulates-spatial-memory-and-characteristics-of-the-synaptic-membrane-in-the-male-zebra-finch
#3
David J Bailey, Yekaterina V Makeyeva, Elizabeth R Paitel, Alyssa L Pedersen, Angel T Hon, Jordan A Gunderson, Colin J Saldanha
The estrogen-synthesizing enzyme aromatase is abundant at the synapse in the zebra finch hippocampus (HP) and its inhibition impairs spatial memory function. To more fully test the role of local estradiol (E2) synthesis in memory, the HP of adult male zebra finches was exposed to either control pellets or those containing the aromatase inhibitor ATD, ATD and E2, ATD and the G protein-coupled estrogen receptor (GPER) agonist G1, or the antagonist G15 alone. Birds were tested for spatial memory acquisition and performance, and HP levels of the postsynaptic protein PSD95 were measured...
January 27, 2017: Endocrinology
https://www.readbyqxmd.com/read/28320265/role-of-atypical-protein-kinases-in-maintenance-of-long-term-memory-and-synaptic-plasticity
#4
REVIEW
A A Borodinova, A B Zuzina, P M Balaban
Investigation of biochemical mechanisms underlying the long-term storage of information in nervous system is one of main problems of modern neurobiology. As a molecular basis of long-term memory, long-term changes in kinase activities, increase in the level and changes in the subunit composition of receptors in synaptic membranes, local activity of prion-like proteins, and epigenetic modifications of chromatin have been proposed. Perhaps a combination of all or of some of these factors underlies the storage of long-term memory in the brain...
March 2017: Biochemistry. Biokhimii︠a︡
https://www.readbyqxmd.com/read/28315373/memory-for-objects-and-startle-responsivity-in-the-immediate-aftermath-of-exposure-to-the-trier-social-stress-test
#5
Nadja Herten, Dennis Pomrehn, Oliver T Wolf
Previously we observed enhanced long-term memory for objects used (central objects) by committee members in the Trier Social Stress Test (TSST) on the next day. In addition, startle responsivity was increased. However, response specificity to an odour involved in the stressful episode was lacking and recognition memory for the odour was poor. In the current experiments, immediate effects of the stressor on memory and startle responsivity were investigated. We hypothesised memory for central objects of the stressful episode and startle response specificity to an odour ambient during the TSST to be enhanced shortly after it in contrast to the control condition (friendly TSST)...
March 14, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28315367/perturbation-of-old-knowledge-precedes-integration-of-new-knowledge
#6
Xiaoping Fang, Charles A Perfetti
The importance of memory consolidation in integrating new knowledge has received much recent attention in the field of word learning. Less examined is the change in existing word knowledge as a result of learning, which we hypothesize to occur prior to the opportunity for consolidation. To test this, we had participants learn new meanings for known words and novel words. Then they performed a one-back task on a list of words that included the trained words followed by words that probed either their new or original meanings while EEGs were recorded...
March 14, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28304289/episodic-memory-dysfunction-in%C3%A2-behavioral-variant-frontotemporal-dementia-a-clinical-and-fdg-pet-study
#7
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/28303092/synaptic-ensemble-underlying-the-selection-and-consolidation-of-neuronal-circuits-during-learning
#8
REVIEW
Yoshio Hoshiba, Takeyoshi Wada, Akiko Hayashi-Takagi
Memories are crucial to the cognitive essence of who we are as human beings. Accumulating evidence has suggested that memories are stored as a subset of neurons that probably fire together in the same ensemble. Such formation of cell ensembles must meet contradictory requirements of being plastic and responsive during learning, but also stable in order to maintain the memory. Although synaptic potentiation is presumed to be the cellular substrate for this process, the link between the two remains correlational...
2017: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/28302564/tackling-maladaptive-memories-through-reconsolidation-from-neural-to-clinical-science
#9
James W B Elsey, Merel Kindt
Behavioral neuroscience has greatly informed how we understand the formation, persistence, and plasticity of memory. Research has demonstrated that memory reactivation can induce a labile period, during which previously consolidated memories are sensitive to change, and in need of restabilization. This process is known as reconsolidation. Such findings have advanced not only our basic understanding of memory processes, but also hint at the prospect of harnessing these insights for the development of a new generation of treatments for disorders of emotional memory...
March 18, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28302453/brain-rhythm-attractor-breakdown-in-alzheimer-s-disease-functional-and-pathologic-implications
#10
Elissaios Karageorgiou, Keith A Vossel
This perspective binds emerging evidence on the bidirectional relationship between Alzheimer's disease (AD) and sleep disorders through a model of brain rhythm attractor breakdown. This approach explains behavioral-cognitive changes in AD across the sleep-wake cycle and supports a causal association between early brainstem tau pathology and subsequent cortical amyloid-β accumulation. Specifically, early tau dysregulation within brainstem-hypothalamic nuclei leads to breakdown of sleep-wake attractor networks, with patients displaying an attenuated range of behavioral and electrophysiological activity patterns, a "twilight zone" of constant activity between deep rest and full alertness...
March 13, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28301203/time-for-considering-the-possibility-that-sleep-plays-no-unique-role-in-motor-memory-consolidation-reply-to-adi-japha-and-karni-2016
#11
Timothy C Rickard, Steven C Pan
The hypothesis that sleep makes a unique contribution to motor memory consolidation has been debated in recent years. In the target article (Pan & Rickard, 2015), we reported results of a comprehensive meta-analysis of the explicit motor sequence learning literature in which evidence was evaluated for both enhanced performance after sleep and stabilization after sleep. After accounting for confounding variables, we found no compelling evidence for either empirical phenomenon, and hence no compelling evidence for sleep-specific consolidation...
April 2017: Psychological Bulletin
https://www.readbyqxmd.com/read/28298552/dynamic-expression-of-fkbp5-in-the-medial-prefrontal-cortex-regulates-resiliency-to-conditioned-fear
#12
Marangelie Criado-Marrero, Roberto J Morales Silva, Bethzaly Velazquez, Anixa Hernández, María Colon, Emmanuel Cruz, Omar Soler-Cedeño, James T Porter
The factors influencing resiliency to the development of post-traumatic stress disorder (PTSD) remain to be elucidated. Clinical studies associate PTSD with polymorphisms of the FK506 binding protein 5 (FKBP5). However, it is unclear whether changes in FKBP5 expression alone could produce resiliency or susceptibility to PTSD-like symptoms. In this study, we used rats as an animal model to examine whether FKBP5 in the infralimbic (IL) or prelimbic (PL) medial prefrontal cortex regulates fear conditioning or extinction...
April 2017: Learning & Memory
https://www.readbyqxmd.com/read/28292834/functional-connectivity-of-multiple-brain-regions-required-for-the-consolidation-of-social-recognition-memory
#13
Toshiyuki Tanimizu, Justin W Kenney, Emiko Okano, Kazune Kadoma, Paul W Frankland, Satoshi Kida
Social recognition memory is an essential and basic component of social behavior to discriminate familiar and novel animals/humans. Previous studies have shown the importance of several brain regions for social recognition memories; however, the mechanisms underlying the consolidation of social recognition memory at the molecular and anatomic levels remain unknown. Here, we show a brain network necessary for the generation of social recognition memory in mice. A mouse genetic study showed that cAMP-responsive element-binding protein (CREB)-mediated transcription is required for the formation of social recognition memory...
March 14, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28290061/accelerated-resolution-therapy-art-a-review-and-research-to-date
#14
REVIEW
Wendi Waits, Megan Marumoto, Jennifer Weaver
PURPOSE OF REVIEW: To describe and summarize published research on accelerated resolution therapy (ART), a promising and relatively new psychotherapy with the potential to offer rapid and effective resolution of a wide range of psychiatric symptoms. Unlike most evidence-based psychotherapies, ART is a predominately imaginative therapy that relies upon the rescripting of distressing events and metaphors as one of its key therapeutic elements. RECENT FINDINGS: The number of studies conducted on ART is limited, primarily consisting of one randomized, controlled trial (RCT) with 57 subjects and two large cohort studies involving 80 and 117 subjects, respectively...
March 2017: Current Psychiatry Reports
https://www.readbyqxmd.com/read/28288833/the-impact-of-sleep-on-novel-concept-learning
#15
Yvette M Graveline, Erin J Wamsley
Prior research demonstrates that sleep benefits memory consolidation. But beyond its role in memory retention, sleep may also facilitate the reorganization and flexible use of new information. In the present study, we investigated the effect of sleep on conceptual knowledge. Participants classified abstract dot patterns into novel categories, and were later tested on both previously seen dot patterns as well as on new patterns. A Wake group (n = 17) trained at 9 AM, continued with their daily activities, and then tested at 9 PM that evening...
March 10, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28288702/the-oil-rich-alga-schizochytrium-sp-as-a-dietary-source-of-docosahexaenoic-acid-improves-shape-discrimination-learning-associated-with-visual-processing-in-a-canine-model-of-senescence
#16
K B Hadley, J Bauer, N W Milgram
Whole cell Schizochytrium sp. is a rich source of omega-3 long-chain polyunsaturated fatty acids (n-3 LCPUFA) including docosahexaenoic acid (DHA), an important nutrient for brain health. Aged beagle dogs experienced on a visuospatial task of working memory, variable-delay delayed-non-matching-to-position were used to assess efficacy of DHA-rich microalgae based upon DHA wt% of total phospholipids and 8-iso-PGF2α concentrations in plasma, and performance on cognitive assessments of visual object discrimination, learning, and memory consolidation after 25 weeks on fortified diet...
March 2017: Prostaglandins, Leukotrienes, and Essential Fatty Acids
https://www.readbyqxmd.com/read/28288397/neural-mechanisms-of-vocal-imitation-the-role-of-sleep-replay-in-shaping-mirror-neurons
#17
REVIEW
Nicolas Giret, Jean-Marc Edeline, Catherine Del Negro
Learning by imitation involves not only perceiving another individual's action to copy it, but also the formation of a memory trace in order to gradually establish a correspondence between the sensory and motor codes, which represent this action through sensorimotor experience. Memory and sensorimotor processes are closely intertwined. Mirror neurons, which fire both when the same action is performed or perceived, have received considerable attention in the context of imitation. An influential view of memory processes considers that the consolidation of newly acquired information or skills involves an active offline reprocessing of memories during sleep within the neuronal networks that were initially used for encoding...
March 10, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28288386/sleep-regulation-of-the-distribution-of-cortical-firing-rates
#18
REVIEW
Daniel Levenstein, Brendon O Watson, John Rinzel, György Buzsáki
Sleep is thought to mediate both mnemonic and homeostatic functions. However, the mechanism by which this brain state can simultaneously implement the 'selective' plasticity needed to consolidate novel memory traces and the 'general' plasticity necessary to maintain a well-functioning neuronal system is unclear. Recent findings show that both of these functions differentially affect neurons based on their intrinsic firing rate, a ubiquitous neuronal heterogeneity. Furthermore, they are both implemented by the NREM slow oscillation, which also distinguishes neurons based on firing rate during sequential activity at the DOWN→UP transition...
March 10, 2017: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/28288205/long-term-effects-of-interference-on-short-term-memory-performance-in-the-rat
#19
Mégane Missaire, Nicolas Fraize, Mickaël Antoine Joseph, Al Mahdy Hamieh, Régis Parmentier, Aline Marighetto, Paul Antoine Salin, Gaël Malleret
A distinction has always been made between long-term and short-term memory (also now called working memory, WM). The obvious difference between these two kinds of memory concerns the duration of information storage: information is supposedly transiently stored in WM while it is considered durably consolidated into long-term memory. It is well acknowledged that the content of WM is erased and reset after a short time, to prevent irrelevant information from proactively interfering with newly stored information...
2017: PloS One
https://www.readbyqxmd.com/read/28287761/familiarity-speeds-up-visual-short-term-memory-consolidation
#20
Weizhen Xie, Weiwei Zhang
Existing long-term memory (LTM) can boost the number of retained representations over a short delay in visual short-term memory (VSTM). However, it is unclear whether and how prior LTM affects the initial process of transforming fragile sensory inputs into durable VSTM representations (i.e., VSTM consolidation). The consolidation speed hypothesis predicts faster consolidation for familiar relative to unfamiliar stimuli. Alternatively, the perceptual boost hypothesis predicts that the advantage in perceptual processing of familiar stimuli should add a constant boost for familiar stimuli during VSTM consolidation...
March 13, 2017: Journal of Experimental Psychology. Human Perception and Performance
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