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"Long term memory"

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https://www.readbyqxmd.com/read/28210219/mice-lacking-m1-and-m3-muscarinic-acetylcholine-receptors-have-impaired-odor-discrimination-and-learning
#1
Wilson Chan, Sanmeet Singh, Taj Keshav, Ramita Dewan, Christian Eberly, Robert Maurer, Alexia Nunez-Parra, Ricardo C Araneda
The cholinergic system has extensive projections to the olfactory bulb (OB) where it produces a state-dependent regulation of sensory gating. Previous work has shown a prominent role of muscarinic acetylcholine (ACh) receptors (mAChRs) in regulating the excitability of OB neurons, in particular the M1 receptor. Here, we examined the contribution of M1 and M3 mAChR subtypes to olfactory processing using mice with a genetic deletion of these receptors, the M1(-/-) and the M1/M3(-/-) knockout (KO) mice. Genetic ablation of the M1 and M3 mAChRs resulted in a significant deficit in odor discrimination of closely related molecules, including stereoisomers...
2017: Frontiers in Synaptic Neuroscience
https://www.readbyqxmd.com/read/28202715/updating-of-aversive-memories-after-temporal-error-detection-is-differentially-modulated-by-mtor-across-development
#2
Lucille Tallot, Lorenzo Diaz-Mataix, Rosemarie E Perry, Kira Wood, Joseph E LeDoux, Anne-Marie Mouly, Regina M Sullivan, Valérie Doyère
The updating of a memory is triggered whenever it is reactivated and a mismatch from what is expected (i.e., prediction error) is detected, a process that can be unraveled through the memory's sensitivity to protein synthesis inhibitors (i.e., reconsolidation). As noted in previous studies, in Pavlovian threat/aversive conditioning in adult rats, prediction error detection and its associated protein synthesis-dependent reconsolidation can be triggered by reactivating the memory with the conditioned stimulus (CS), but without the unconditioned stimulus (US), or by presenting a CS-US pairing with a different CS-US interval than during the initial learning...
March 2017: Learning & Memory
https://www.readbyqxmd.com/read/28201836/working-memory-in-aphasia-considering-discourse-processing-and-treatment-implications
#3
Amy Henderson, Hana Kim, Stephen Kintz, Nicole Frisco, Heather Harris Wright
Evidence suggests that persons with aphasia (PWAs) present with working memory impairments that affect a variety of language tasks. Most of these studies have focused on the phonological loop component of working memory and little attention has been paid to the episodic buffer component. The episodic buffer, as a limited capacity, multimodal system that binds and integrates information from the phonological loop, visuospatial sketchpad, and long-term memory would likely be involved in discourse processing. The purposes of this article were to (1) review discourse level deficits associated with aphasia, (2) describe how a deficit at the level of the episodic buffer could cause such deficits, (3) to review discourse treatment approaches for PWAs, and (4) present preliminary results from a novel discourse treatment study for PWAs...
February 2017: Seminars in Speech and Language
https://www.readbyqxmd.com/read/28198817/dynamic-properties-of-calcium-activated-chloride-currents-in-xenopus-laevis-oocytes
#4
Ildefonso M De la Fuente, Iker Malaina, Alberto Pérez-Samartín, María Dolores Boyano, Gorka Pérez-Yarza, Carlos Bringas, Álvaro Villarroel, María Fedetz, Rogelio Arellano, Jesus M Cortes, Luis Martínez
Chloride is the most abundant permeable anion in the cell, and numerous studies in the last two decades highlight the great importance and broad physiological role of chloride currents mediated anion transport. They participate in a multiplicity of key processes, as for instance, the regulation of electrical excitability, apoptosis, cell cycle, epithelial secretion and neuronal excitability. In addition, dysfunction of Cl(-) channels is involved in a variety of human diseases such as epilepsy, osteoporosis and different cancer types...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28197555/biphasic-regulation-of-p38-mapk-by-serotonin-contributes-to-the-efficacy-of-stimulus-protocols-that-induce-long-term-synaptic-facilitation
#5
Yili Zhang, Paul Smolen, Douglas A Baxter, John H Byrne
The MAPK isoforms ERK and p38 MAPK are believed to play opposing roles in long-term synaptic facilitation (LTF) induced by serotonin (5-HT) in Aplysia. To fully understand their roles, however, it is necessary to consider the dynamics of ERK and p38 MAPK activation. Previous studies determined that activation of ERK occurred ∼45 min after a 5-min pulse of 5-HT treatment. The dynamics of p38 MAPK activation following 5-HT are yet to be elucidated. Here, the activity of p38 MAPK was examined at different times after 5-HT, and the interaction between the ERK and p38 MAPK pathways was investigated...
January 2017: ENeuro
https://www.readbyqxmd.com/read/28196142/moderate-injury-in-motor-sensory-cortex-causes-behavioral-deficits-accompanied-by-electrophysiological-changes-in-mice-adulthood
#6
Wei Ouyang, Qichao Yan, Yu Zhang, Zhiheng Fan
Moderate traumatic brain injury (TBI) in children often happen when there's a sudden blow to the frontal bone, end with long unconscious which can last for hours and progressive cognitive deficits. However, with regard to the influences of moderate TBI during children adulthood, injury-induced alterations of locomotive ability, long-term memory performance, and hippocampal electrophysiological firing changes have not yet been fully identified. In this study, lateral fluid percussion (LFP) method was used to fabricate moderate TBI in motor and somatosensory cortex of the 6-weeks-old mice...
2017: PloS One
https://www.readbyqxmd.com/read/28195219/constitutive-activation-of-creb-in-mice-enhances-temporal-association-learning-and-increases-hippocampal-ca1-neuronal-spine-density-and-complexity
#7
Tatsurou Serita, Hotaka Fukushima, Satoshi Kida
Transcription factor CREB is believed to play essential roles in the formation of long-term memory (LTM), but not in learning and short-term memory (STM). Surprisingly, we previously showed that transgenic mice expressing a dominant active mutant of CREB (DIEDML) in the forebrain (DIEDML mice) demonstrated enhanced STM and LTM in hippocampal-dependent, rapid, one-trial learning tasks. Here we show that constitutive activation of CREB enhances hippocampal-dependent learning of temporal association in trace fear conditioning and delayed matching-to-place tasks...
February 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28188665/memory-for-relations-in-the-short-term-and-the-long-term-after-medial-temporal-lobe-damage
#8
Larry R Squire
A central idea about the organization of declarative memory and the function of the hippocampus is that the hippocampus provides for the coding of relationships between items. A question arises whether this idea refers to the process of forming long-term memory or whether, as some studies have suggested, memory for relations might depend on the hippocampus even at short retention intervals and even when the task falls within the province of short-term (working) memory. The latter formulation appears to place the operation of relational memory into conflict with the idea that working memory is independent of medial temporal lobe (MTL) structures...
February 11, 2017: Hippocampus
https://www.readbyqxmd.com/read/28179558/cell-specific-pkm-isoforms-contribute-to-the-maintenance-of-different-forms-of-persistent-long-term-synaptic-plasticity
#9
Jiangyuan Hu, Kerry Adler, Carole Abi Farah, Margaret H Hastings, Wayne S Sossin, Samuel Schacher
Multiple kinase activations contribute to long-term synaptic plasticity, a cellular mechanism mediating long-term memory. The sensorimotor synapse of Aplysia expresses different forms of long-term facilitation (LTF) - non-associative and associative LTF - that require the timely activation of kinases, including PKC. It is not known which PKC isoforms in the sensory neuron or motor neuron L7 are required to sustain each form of LTF. We show that different PKMs, the constitutively active isoforms of PKCs generated by calpain cleavage, in the sensory neuron and L7 are required to maintain each form of LTF...
February 8, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28178591/attenuation-of-stress-induced-memory-deficits-by-nonsteroidal-anti-inflammatory-drugs-nsaids-in-rats-role-of-antioxidant-enzymes
#10
Shaista Emad, Sara Qadeer, Sana Sadaf, Zehra Batool, Saida Haider, Tahira Perveen
BACKGROUND: Repeated stress paradigms have been shown to cause devastating alterations on memory functions. Stress is linked with inflammation. Psychological and certain physical stressors could lead to neuroinflammation. Inflammatory process may occur by release of mediators and stimulate the production of prostaglandins through cyclooxygenase (COX). Treatment with COX inhibitors, which restrain prostaglandin production, has enhanced memory in a number of neuroinflammatory states showing a potential function for raised prostaglandins in these memory shortfalls...
November 29, 2016: Pharmacological Reports: PR
https://www.readbyqxmd.com/read/28169439/postretrieval-extinction-attenuates-alcohol-cue-reactivity-in-rats
#11
Roberto U Cofresí, Suzanne M Lewis, Nadia Chaudhri, Hongjoo J Lee, Marie-H Monfils, Rueben A Gonzales
BACKGROUND: Conditioned responses to alcohol-associated cues can hinder recovery from alcohol use disorder (AUD). Cue exposure (extinction) therapy (CET) can reduce reactivity to alcohol cues, but its efficacy is limited by phenomena such as spontaneous recovery and reinstatement that can cause a return of conditioned responding after extinction. Using a preclinical model of alcohol cue reactivity in rats, we evaluated whether the efficacy of alcohol CET could be improved by conducting CET during the memory reconsolidation window after retrieval of cue-alcohol associations...
February 7, 2017: Alcoholism, Clinical and Experimental Research
https://www.readbyqxmd.com/read/28161989/-it-brings-it-all-back-all-those-good-times-it-makes-me-go-close-to-tears-creating-digital-personalised-stories-with-people-who-have-dementia
#12
Valerie Critten, Natalia Kucirkova
The purpose of these three case studies was to analyse and theoretically explain the contribution of digital multimedia personalisation to stimulate and share long-term memories of people who live with mild to moderate dementia. We investigated how the use of a freely available iPad app can, in a supporting context, facilitate the creation of personalised multimedia stories, including the participants' audio recordings, texts and photos of items, places or people important to them. Three people who were recruited from a club for people living with dementia created personalised multimedia stories using their own photographs and/or pictures downloaded from the internet, with written captions and audio-recorded voiceovers...
January 1, 2017: Dementia
https://www.readbyqxmd.com/read/28161728/prior-visual-experience-modulates-learning-of-sound-localization-among-blind-individuals
#13
Qian Tao, Chetwyn C H Chan, Yue-Jia Luo, Jian-Jun Li, Kin-Hung Ting, Zhong-Lin Lu, Susan Whitfield-Gabrieli, Jun Wang, Tatia M C Lee
Cross-modal learning requires the use of information from different sensory modalities. This study investigated how the prior visual experience of late blind individuals could modulate neural processes associated with learning of sound localization. Learning was realized by standardized training on sound localization processing, and experience was investigated by comparing brain activations elicited from a sound localization task in individuals with (late blind, LB) and without (early blind, EB) prior visual experience...
February 4, 2017: Brain Topography
https://www.readbyqxmd.com/read/28160034/the-effects-of-synthetic-cannabinoids-on-executive-function
#14
K Cohen, M Kapitány-Fövény, Y Mama, M Arieli, P Rosca, Z Demetrovics, A Weinstein
BACKGROUND AND AIMS: There is a growing use of novel psychoactive substances (NPSs) including synthetic cannabinoids. Synthetic cannabinoid products have effects similar to those of natural cannabis but the new synthetic cannabinoids are more potent and dangerous and their use has resulted in various adverse effects. The purpose of the study was to assess whether persistent use of synthetic cannabinoids is associating with impairments of executive function in chronic users. METHODS: A total of 38 synthetic cannabinoids users, 43 recreational cannabis users, and 41 non-user subjects were studied in two centers in Hungary and Israel...
February 3, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28155134/parallel-basal-ganglia-circuits-for-decision-making
#15
REVIEW
Okihide Hikosaka, Ali Ghazizadeh, Whitney Griggs, Hidetoshi Amita
The basal ganglia control body movements, mainly, based on their values. Critical for this mechanism is dopamine neurons, which sends unpredicted value signals, mainly, to the striatum. This mechanism enables animals to change their behaviors flexibly, eventually choosing a valuable behavior. However, this may not be the best behavior, because the flexible choice is focused on recent, and, therefore, limited, experiences (i.e., short-term memories). Our old and recent studies suggest that the basal ganglia contain separate circuits that process value signals in a completely different manner...
February 2, 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/28153096/hiv-1-conserved-mosaics-delivered-by-regimens-with-integration-deficient-dc-targeting-lentiviral-vector-induce-robust-t-cells
#16
Edmund G Wee, Beatrice Ondondo, Peter Berglund, Jacob Archer, Andrew J McMichael, David Baltimore, Jan H Ter Meulen, Tomáš Hanke
To be effective against HIV type 1 (HIV-1), vaccine-induced T cells must selectively target epitopes, which are functionally conserved (present in the majority of currently circulating and reactivated HIV-1 strains) and, at the same time, beneficial (responses to which are associated with better clinical status and control of HIV-1 replication), and rapidly reach protective frequencies upon exposure to the virus. Heterologous prime-boost regimens using virally vectored vaccines are currently the most promising vaccine strategies; nevertheless, induction of robust long-term memory remains challenging...
February 1, 2017: Molecular Therapy: the Journal of the American Society of Gene Therapy
https://www.readbyqxmd.com/read/28152467/prevention-of-recurrent-affective-episodes-using-extinction-training-in-the-reconsolidation-window-a-testable-psychotherapeutic-strategy
#17
REVIEW
Robert M Post, Robert Kegan
Stressors may initially precipitate affective episodes, but with sufficient numbers of recurrences, episodes can occur more autonomously. It is postulated the memory engram for these recurrent depressions moves from the conscious representational memory system to the unconscious habit memory system encoded in the striatum. If this were the case, cognitive behavior therapy targeted toward extinction of habit memories could be an effective maneuver for helping reverse the automaticity of affective episode recurrence...
January 20, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28151087/effects-of-isometric-hand-grip-muscle-contraction-on-young-adults-free-recall-and-recognition-memory
#18
Phillip D Tomporowski, Chelesa Albrecht, Daniel M Pendleton
PURPOSE: The purpose of this study was to determine if physical arousal produced by isometric hand-dynamometer contraction performed during word-list learning affects young adults' free recall or recognition memory. METHOD: Twenty-four young adults (12 female; Mage = 22 years) were presented with 4 20-item word lists. Moderate arousal was induced in 12 adults by an initial 30-s maximal hand-dynamometer squeeze with force productions of 50% maximum; low arousal was induced in 12 adults by an initial 1-s maximal dynamometer squeeze with force production of 10% maximum during learning...
February 2, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28149078/toxic-effect-of-khat-catha-edulis-on-memory-systematic-review-and-meta-analysis
#19
Birhane Alem Berihu, Gebrekidan Gebregzabher Asfeha, Abadi Leul Welderufael, Yared Godefa Debeb, Yibrah Berhe Zelelow, Hafte Assefa Beyene
BACKGROUND: People use khat (Catha edulis) for its pleasant stimulant effect of physical activity, consciousness, motor, and mental functions. Although there are reports assessing the effect of khat on memory, there was no study based on formal systematic review and meta-analysis. OBJECTIVE: We have therefore conducted this meta-analysis to determine the level of evidence for the effect of khat (C. edulis Forsk) on memory discrepancy. METHODS: MEDLINE, Cochrane Library, PubMed, Academic Search Complete, SPORTDiscus, ScienceDirect, Scopus, Web of Science, and Google Scholar were searched to retrieve the papers for this review...
January 2017: Journal of Neurosciences in Rural Practice
https://www.readbyqxmd.com/read/28148835/long-term-memory-of-relative-reward-values
#20
Francesca Soldati, Oliver H P Burman, Elizabeth A John, Thomas W Pike, Anna Wilkinson
Long-term memory can be adaptive as it allows animals to retain information that is crucial for survival, such as the appearance and location of key resources. This is generally examined by comparing choices of stimuli that have value to the animal with those that do not; however, in nature choices are rarely so clear cut. Animals are able to assess the relative value of a resource via direct comparison, but it remains unclear whether they are able to retain this information for a biologically meaningful amount of time...
February 2017: Biology Letters
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