Read by QxMD icon Read

Memory consolidation

Tiernan Thomas O'Malley, William M Wittbold, Sara Linse, Dominic M Walsh
Extracts of Alzheimer's disease (AD) brain that contain what appear to be SDS-stable amyloid β-protein (Aβ) dimers potently block LTP and impair memory consolidation. Brain-derived dimers can be physically separated from Aβ monomer, consist primarily of Aβ42 and resist denaturation by powerful chaotropic agents. In nature, covalently cross-linked Aβ dimers could be generated in only one of two different ways - either by the formation of a dityrosine (DiY) or an isopeptide ε-(γ-glutamyl)-lysine (Q-K) bond...
October 17, 2016: Biochemistry
Anthony Holtmaat, Pico Caroni
Learning and memory are associated with the formation and modification of neuronal assemblies: populations of neurons that encode what has been learned and mediate memory retrieval upon recall. Functional studies of neuronal assemblies have progressed dramatically thanks to recent technological advances. Here we discuss how a focus on assembly formation and consolidation has provided a powerful conceptual framework to relate mechanistic studies of synaptic and circuit plasticity to behaviorally relevant aspects of learning and memory...
October 17, 2016: Nature Neuroscience
Nicolas Fraize, Julien Carponcy, Mickaël Antoine Joseph, Jean-Christophe Comte, Pierre-Hervé Luppi, Paul-Antoine Libourel, Paul-Antoine Salin, Gaël Malleret, Régis Parmentier
STUDY OBJECTIVES: It is commonly accepted that sleep is beneficial to memory processes, but it is still unclear if this benefit originates from improved memory consolidation or enhanced information processing. It has thus been proposed that sleep may also promote forgetting of undesirable and non-essential memories, a process required for optimization of cognitive resources. We tested the hypothesis that non-rapid eye movement sleep (NREMS) promotes forgetting of irrelevant information, more specifically when processing information in working memory (WM), while REM sleep (REMS) facilitates the consolidation of important information...
October 10, 2016: Sleep
Harini C Krishnan, Catherine E Gandour, Joshua L Ramos, Mariah C Wrinkle, Joseph J Sanchez-Pacheco, Lisa C Lyons
STUDY OBJECTIVE: Insufficient sleep in individuals appears increasingly common due to the demands of modern work schedules and technology use. Consequently, there is a growing need to understand the interactions between sleep deprivation and memory. The current study determined the effects of acute sleep deprivation on short- and long-term associative memory using the marine mollusk Aplysia californica, a relatively simple model system well known for studies of learning and memory. DESIGN: Aplysia were sleep deprived for 9 h using context changes and tactile stimulation prior to or after training using the operant learning paradigm, learning that food is inedible (LFI)...
October 10, 2016: Sleep
Beatrice Vignoli, Giulia Battistini, Riccardo Melani, Robert Blum, Spartaco Santi, Nicoletta Berardi, Marco Canossa
Glial cells respond to neuronal activation and release neuroactive molecules (termed "gliotransmitters") that can affect synaptic activity and modulate plasticity. In this study, we used molecular genetic tools, ultra-structural microscopy, and electrophysiology to assess the role of brain-derived neurotrophic factor (BDNF) on cortical gliotransmission in vivo. We find that glial cells recycle BDNF that was previously secreted by neurons as pro-neurotrophin following long-term potentiation (LTP)-inducing electrical stimulation...
October 12, 2016: Neuron
Lengqiu Guo, Zhuangli Guo, Xiaoqing Luo, Rui Liang, Shui Yang, Haigang Ren, Guanghui Wang, Xuechu Zhen
Sleep, particularly rapid eye movement (REM) sleep, is implicated in the consolidation of emotional memories. In the present study, we investigated the protective effects of a phosphodiesterase 10A (PDE10A) inhibitor MP-10 on deficits in long-term fear memory induced by REM sleep deprivation (REM-SD). REM-SD caused deficits in long-term fear memory, however, MP-10 administration ameliorated the deleterious effects of REM-SD on long term fear memory. Brain-derived neurotropic factor (BDNF) and phosphorylated cAMP response element-binding protein (pCREB) were altered in specific brain regions associated with learning and memory in REM-SD rats...
October 12, 2016: Neuroscience Letters
Eric M Janezic, Swetha Uppalapati, Stephanie Nagl, Marco Contreras, Edward D French, Jean-Marc Fellous
Post-traumatic stress disorder (PTSD) is in part due to a deficit in memory consolidation and extinction. Oxytocin (OXT) has anxiolytic effects and promotes prosocial behaviors in both rodents and humans, and evidence suggests that it plays a role in memory consolidation. We studied the effects of administered OXT and social co-housing in a rodent model of PTSD. Acute OXT yielded a short-term increase in the recall of the traumatic memory if administered immediately after trauma. Low doses of OXT delivered chronically had a cumulating anxiolytic effect that became apparent after 4 days and persisted...
October 12, 2016: Behavioural Pharmacology
Nicolas A McNair, Patrick T Goodbourn, Lauren T Shone, Irina M Harris
We used the attentional blink (AB) paradigm to investigate the processing stage at which extraction of summary statistics from visual stimuli ("ensemble coding") occurs. Experiment 1 examined whether ensemble coding requires attentional engagement with the items in the ensemble. Participants performed two sequential tasks on each trial: gender discrimination of a single face (T1) and estimating the average emotional expression of an ensemble of four faces (or of a single face, as a control condition) as T2...
October 13, 2016: Attention, Perception & Psychophysics
Cynthia Katche, Micol Tomaiuolo, Guido Dorman, Jorge H Medina, Haydee Viola
Learning to avoid threats in the environment is highly adaptive. However, sometimes a dysregulation of fear memories processing may underlie fear-related disorders. Despite recent advances, a major question of how to effectively attenuate persistent fear memories in a safe manner remains unresolved. Here we show experiments employing a behavioural tool to target a specific time window after training to limit the persistence of a fear memory in rats. We observed that exposure to a novel environment 11 h after an inhibitory avoidance (IA) training that induces a long-lasting memory, attenuates the durability of IA memory but not its formation...
October 13, 2016: Scientific Reports
Dong V Wang, Satoshi Ikemoto
: Hippocampal-cortical interaction during sleep promotes transformation of memory for long-term storage in the cortex. In particular, hippocampal sharp-wave ripple-associated neural activation is important for this transformation during slow-wave sleep. The anterior cingulate cortex (ACC) has been shown to be crucial for expression and likely storage of long-term memory. However, little is known about how ACC activity is influenced by hippocampal ripple activity during sleep. We report here about coordinated interactions between hippocampal ripple activity and ACC neural firings...
October 12, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
David Levitan, Yaihara Fortis-Santiago, Joshua A Figueroa, Emily E Reid, Takashi Yoshida, Nicholas C Barry, Abigail Russo, Donald B Katz
: In neuroscientists' attempts to understand the long-term storage of memory, topics of particular importance and interest are the cellular and system mechanisms of maintenance (e.g., those sensitive to ζ-inhibitory peptide, ZIP) and those induced by memory retrieval (i.e., reconsolidation). Much is known about each of these processes in isolation, but less is known concerning how they interact. It is known that ZIP sensitivity and memory retrieval share at least some molecular targets (e...
October 12, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
Daniel García-Pérez, Szilamer Ferenczi, Krisztina J Kovács, M Luisa Laorden, M Victoria Milanés, Cristina Núñez
Drug-withdrawal-associated aversive memories might trigger relapse to drug-seeking behavior. However, changes in structural and synaptic plasticity, as well as epigenetic mechanisms, which may be critical for long-term aversive memory, have yet to be elucidated. We used male Wistar rats and performed conditioned-place aversion (CPA) paradigm to uncover the role of glucocorticoids (GCs) on plasticity-related processes that occur within the dentate gyrus (DG) during opiate-withdrawal conditioning (memory formation-consolidation) and after reactivation by re-exposure to the conditioned environment (memory retrieval)...
October 11, 2016: Molecular Neurobiology
Daniel García-Pérez, Szilamer Ferenczi, Krisztina J Kovács, M Luisa Laorden, M Victoria Milanés, Cristina Núñez
Drug-withdrawal aversive memories generate a motivational state leading to compulsive drug taking, with plasticity changes in the basolateral amygdala (BLA) being essential in aversive motivational learning. The conditioned-place aversion (CPA) paradigm allows for measuring the negative affective component of drug withdrawal. First, CPA triggers association between negative affective consequences of withdrawal with context (memory consolidation). Afterwards, when the animals are re-exposed to the paired environment, they avoid it due to the association between the context and aversive memories (memory retrieval)...
September 28, 2016: Psychoneuroendocrinology
S Cohen, G Ifergane, E Vainer, M A Matar, Z Kaplan, J Zohar, A A Mathé, H Cohen
Pharmacotherapeutic intervention during traumatic memory consolidation has been suggested to alleviate or even prevent the development of posttraumatic stress disorder (PTSD). We recently reported that, in a controlled, prospective animal model, depriving rats of sleep following stress exposure prevents the development of a PTSD-like phenotype. Here, we report that administering the wake-promoting drug modafinil to rats in the aftermath of a stressogenic experience has a similar prophylactic effect, as it significantly reduces the prevalence of PTSD-like phenotype...
October 11, 2016: Translational Psychiatry
Indulekha P Sudhakaran, Mani Ramaswami
Long-term and short-term memories differ primarily in the duration of their retention. At a molecular level, long-term memory (LTM) is distinguished from short-term memory (STM) by its requirement for new gene expression. In addition to transcription (nuclear gene expression) the translation of stored mRNAs is necessary for LTM formation. The mechanisms and functions for temporal and spatial regulation of mRNAs required for LTM is a major contemporary problem, of interest from molecular, cell biological, neurobiological and clinical perspectives...
October 11, 2016: RNA Biology
Alison Mary, Vincent Wens, Marc Op de Beeck, Rachel Leproult, Xavier De Tiège, Philippe Peigneux
Decreased neural plasticity is observed with healthy ageing in the primary sensorimotor (SM1) cortex thought to participate in motor learning and memory consolidation processes. In the present magnetoencephalography study, the post-training reorganization of resting-state functional connectivity (rsFC) and its relation with motor learning and early consolidation in 14 young (19-30 years) and 14 old (66-70 years) healthy participants were investigated. At the behavioral level, participants were trained on a motor sequence learning task then retested 20-30 min later for transient offline gains in performance...
October 11, 2016: Human Brain Mapping
Geneviève Albouy, Bradley R King, Christina Schmidt, Martin Desseilles, Thien Thanh Dang-Vu, Evelyne Balteau, Christophe Phillips, Christian Degueldre, Pierre Orban, Habib Benali, Philippe Peigneux, André Luxen, Avi Karni, Julien Doyon, Pierre Maquet, Maria Korman
Motor memory consolidation is characterized, in part, by a sleep-facilitated decrease in susceptibility to subsequent interfering experiences. Surprisingly, the cerebral substrates supporting this phenomenon have never been examined. We used fMRI to investigate the neural correlates of the influence of sleep on interference to motor memory consolidation. Healthy young adults were trained on a sequential motor task, and subsequently practiced a second competing sequence after an interval including diurnal sleep or wakefulness...
October 11, 2016: Scientific Reports
Mohammad Nasehi, Parastu Morteza-Zadeh, Fatemeh Khakpai, Mohammad-Reza Zarrindast
In the current study, we examined the effect of bilateral intra-dorsal hippocampal (intra-CA1) microinjections of GABAA receptor agents on amnesia induced by a β-carboline alkaloid, harmane in mice. We used a single-trial step-down passive avoidance task to assess memory retention and then, open-field test to assess locomotor activity. The results indicated that post-training intra-CA1 injections of bicuculline - a GABAA receptor antagonist - had no significant effect, while muscimol (0.01 and 0.1μg/mouse) - a GABAA receptor agonist - impaired memory consolidation...
October 8, 2016: Neuroscience
Jens G Klinzing, Björn Rasch, Jan Born, Susanne Diekelmann
Sleep is known to support the consolidation of newly encoded and initially labile memories. Once consolidated, remote memories can return to a labile state upon reactivation and need to become reconsolidated in order to persist. Here we asked whether sleep also benefits the reconsolidation of remote memories after their reactivation and how reconsolidation during sleep compares to sleep-dependent consolidation processes. In three groups, participants were trained on a visuo-spatial learning task in the presence of a contextual odor...
October 6, 2016: Neurobiology of Learning and Memory
Kathryn D Baker, Amy C Reichelt
Anxiety disorders and obesity are both common in youth and young adults. Despite increasing evidence that over-consumption of palatable high-fat/high-sugar "junk" foods leads to adverse neurocognitive outcomes, little is known about the effects of palatable diets on emotional memories and fear regulation. In the present experiments we examined the effects of daily 2h consumption of a high-fat/high-sugar (HFHS) food across adolescence on fear inhibition and anxiety-like behaviour in young adult rats. Rats exposed to the HFHS diet exhibited impaired retention of fear extinction and increased anxiety-like behaviour in an emergence test compared to rats fed a standard diet...
October 5, 2016: Neurobiology of Learning and Memory
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"