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"Memory retrieval"

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https://www.readbyqxmd.com/read/29457220/event-related-potentials-of-emotional-and-neutral-memories-the-role-of-encoding-position-and-delayed-testing
#1
Janine Wirkner, Carlos Ventura-Bort, Paul Schulz, Alfons O Hamm, Mathias Weymar
Previous research found that memory is not only better for emotional information but also for neutral information that has been encoded in the context of an emotional event. In the present ERP study, we investigated two factors that may influence memory for neutral and emotional items: temporal proximity between emotional and neutral items during encoding, and retention interval (immediate vs. delayed). Forty-nine female participants incidentally encoded 36 unpleasant and 108 neutral pictures (36 neutral pictures preceded an unpleasant picture, 36 followed an unpleasant picture, and 36 neutral pictures were preceded and followed by neutral pictures) and participated in a recognition memory task either immediately (N = 24) or 1 week (N = 25) after encoding...
February 19, 2018: Psychophysiology
https://www.readbyqxmd.com/read/29456134/parietal-control-network-activation-during-memory-tasks-may-be-associated-with-the-co-occurrence-of-externally-and-internally-directed-cognition-a-cross-function-meta-analysis
#2
Hongkeun Kim
Functional neuroimaging studies on episodic memory retrieval consistently indicated the activation of the precuneus (PCU), mid-cingulate cortex (MCC), and lateral intraparietal sulcus (latIPS) regions. Although studies typically interpreted these activations in terms of memory retrieval processes, resting-state functional connectivity data indicate that these regions are part of the frontoparietal control network, suggesting a more general, cross-functional role. In this regard, this study proposes a novel hypothesis which suggests that the parietal control network plays a strong role in accommodating the co-occurrence of externally directed cognition (EDC) and internally directed cognition (IDC), which are typically antagonistic to each other...
March 15, 2018: Brain Research
https://www.readbyqxmd.com/read/29449457/the-activity-of-thalamic-nucleus-reuniens-is-critical-for-memory-retrieval-but-not-essential-for-the-early-phase-of-off-line-consolidation
#3
Hao Mei, Nikos K Logothetis, Oxana Eschenko
Spatial navigation depends on the hippocampal function, but also requires bidirectional interactions between the hippocampus (HPC) and the prefrontal cortex (PFC). The cross-regional communication is typically regulated by critical nodes of a distributed brain network. The thalamic nucleus reuniens (RE) is reciprocally connected to both HPC and PFC and may coordinate the information flow within the HPC-PFC pathway. Here we examined if RE activity contributes to the spatial memory consolidation. Rats were trained to find reward following a complex trajectory on a crossword-like maze...
March 2018: Learning & Memory
https://www.readbyqxmd.com/read/29442554/neurogenesis-remembering-all-or-forgetting-some
#4
Shikha Jain Goodwin
Research over the last 20 years has begun to elucidate the importance of adult neurogenesis in cognition. Three studies recently asked what might be happening to memories formed before neurogenesis in the hippocampus (Akers et al. 2014; Epp et al. 2016; Kodali et al. 2016). These studies found conflicting results: running (which increases neurogenesis) induced forgetting in two studies, but there was no difference in memory retrieval after exercise in another. To reconcile these studies, one must understand the processes behind memory maintenance and recall, and consider context, species and other factors...
February 14, 2018: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29441041/altered-brain-functional-connectome-in-migraine-with-and-without-restless-legs-syndrome-a-resting-state-functional-mri-study
#5
Fu-Chi Yang, Kun-Hsien Chou, Ai-Ling Hsu, Jong-Ling Fuh, Jiing-Feng Lirng, Hung-Wen Kao, Ching-Po Lin, Shuu-Jiun Wang
Background: Migraine is frequently comorbid with restless legs syndrome (RLS), both displaying functional connectivity (FC) alterations in multiple brain networks, although the neurological basis of this association is unknown. Methods: We performed resting-state functional magnetic resonance imaging and network-wise analysis of FC in migraine patients with and without RLS and healthy controls (CRL). Network-based statistics (NBS) and composite FC matrix analyses were performed to identify the patterns of FC changes...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29435085/estimation-of-effective-connectivity-using-multi-layer-perceptron-artificial-neural-network
#6
Nasibeh Talebi, Ali Motie Nasrabadi, Iman Mohammad-Rezazadeh
Studies on interactions between brain regions estimate effective connectivity, (usually) based on the causality inferences made on the basis of temporal precedence. In this study, the causal relationship is modeled by a multi-layer perceptron feed-forward artificial neural network, because of the ANN's ability to generate appropriate input-output mapping and to learn from training examples without the need of detailed knowledge of the underlying system. At any time instant, the past samples of data are placed in the network input, and the subsequent values are predicted at its output...
February 2018: Cognitive Neurodynamics
https://www.readbyqxmd.com/read/29431279/strategic-value-directed-learning-and-memory-in-alzheimer-s-disease-and-behavioural-variant-frontotemporal-dementia
#7
Stephanie Wong, Muireann Irish, Greg Savage, John R Hodges, Olivier Piguet, Michael Hornberger
In healthy adults, the ability to prioritize learning of highly valued information is supported by executive functions and enhances subsequent memory retrieval for this information. In Alzheimer's disease (AD) and behavioural-variant frontotemporal dementia (bvFTD), marked deficits are evident in learning and memory, presenting in the context of executive dysfunction. It is unclear whether these patients show a typical memory bias for higher valued stimuli. We administered a value-directed word-list learning task to AD (n = 10) and bvFTD (n = 21) patients and age-matched healthy controls (n = 22)...
February 12, 2018: Journal of Neuropsychology
https://www.readbyqxmd.com/read/29423319/improvement-of-long-term-memory-access-with-a-pro-dopamine-regulator-in-an-elderly-male-are-we-targeting-dopamine-tone
#8
Thomas McLaughlin, David Han, James Nicholson, Bruce Steinberg, Kenneth Blum, Marcelo Febo, Eric Braverman, Mona Li, Lyle Fried, Rajendra Badgaiyan
With aging, there is decline in both short-term and long-term memory. This effect is magnified by epigenetic insults on specific, dopamine- related genes (e.g., DRD2, DAT1) as well as by impaired or reduced mRNA transcription. In addition, long-term memory ability is positively correlated with dopamine function and there is evidence that aging is associated with a reduction in brain dopamine D2 receptors, with an acceleration seen in aging-induced dementia. As a result, the authors tested the acute effect of a Pro-Dopamine Regulator (KB220Z, liquid Nano variant) on an aspect of long-term memory performance in a 77-year-old, highly functional male, using the Animal Naming Test (ANT)...
May 2017: Journal of Systems and Integrative Neuroscience
https://www.readbyqxmd.com/read/29416508/the-default-mode-network-supports-episodic-memory-in-cognitively-unimpaired-elderly-individuals-different-contributions-to-immediate-recall-and-delayed-recall
#9
Lijuan Huo, Rui Li, Pengyun Wang, Zhiwei Zheng, Juan Li
While the neural correlates of age-related decline in episodic memory have been the subject of much interest, the spontaneous functional architecture of the brain for various memory processes in elderly adults, such as immediate recall (IR) and delayed recall (DR), remains unclear. The present study thus examined the neural correlates of age-related decline of various memory processes. A total of 66 cognitively normal older adults (aged 60-80 years) participated in this study. Memory processes were measured using the Auditory Verbal Learning Test as well as resting-state brain images, which were analyzed using both regional homogeneity (ReHo) and correlation-based functional connectivity (FC) approaches...
2018: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/29410048/a-daily-single-dose-of-a-novel-modafinil-analogue-ce-123-improves-memory-acquisition-and-memory-retrieval
#10
Martina Kristofova, Yogesh D Aher, Marija Ilic, Bojana Radoman, Predrag Kalaba, Vladimir Dragacevic, Nilima Y Aher, Johann Leban, Volker Korz, Lisa Zanon, Winfried Neuhaus, Marcus Wieder, Thierry Langer, Ernst Urban, Harald H Sitte, Harald Hoeger, Gert Lubec, Jana Aradska
Dopamine reuptake inhibitors have been shown to improve cognitive parameters in various tasks and animal models. We recently reported a series of modafinil analogues, of which the most promising, 5-((benzhydrylsulfinyl)methyl) thiazole (CE-123), was selected for further development. The present study aims to characterize pharmacological properties of CE-123 and to investigate the potential to enhance memory performance in a rat model. In vitro transporter assays were performed in cells expressing human transporters...
February 1, 2018: Behavioural Brain Research
https://www.readbyqxmd.com/read/29408468/neuropeptide-y2-receptors-in-anteroventral-bnst-control-remote-fear-memory-depending-on-extinction-training
#11
Dilip Verma, Ramon Tasan, Guenther Sperk, Hans-Christian Pape
The anterior bed nucleus of stria terminalis (BNST) is involved in reinstatement of extinguished fear, and neuropeptide Y2 receptors influence local synaptic signaling. Therefore, we hypothesized that Y2 receptors in anteroventral BNST (BNSTav) interfere with remote fear memory and that previous fear extinction is an important variable. C57BL/6NCrl mice were fear-conditioned, and a Y2 receptor-specific agonist (NPY3-36) or antagonist (JNJ-5207787) was applied in BNSTav before fear retrieval at the following day...
February 2, 2018: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/29408055/methylphenidate-induces-state-dependency-of-social-recognition-learning-central-components
#12
Carolina Garrido Zinn, Leticia Bühler, Lorena Evelyn Cavalcante, Scheila Daiane Schmidt, Flávia Fagundes Ferreira, Mara Lise Zanini, Cristiane Regina Guerino Furini, Jociane de Carvalho Myskiw, Ivan Izquierdo
Methylphenidate (MPH) is a widely prescribed drug for the treatment of attention-deficit hyperactivity disorder. Findings in the literature suggest that the effects of MPH on memory may result from increased extracellular levels of norepinephrine (NE) and dopamine (DA). Here, we report that the systemic administration of MPH before the acquisition phase in a social discrimination task impaired the retrieval of the social recognition memory (SRM), but made it state-dependent: another administration of MPH before the retention test recovered the SRM...
February 3, 2018: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/29404957/neurofascin-knock-down-in-the-basolateral-amygdala-mediates-resilience-of-memory-and-plasticity-in-the-dorsal-dentate-gyrus-under-stress
#13
Rinki Saha, Martin Kriebel, Hansjürgen Volkmer, Gal Richter-Levin, Anne Albrecht
Activation of the amygdala is one of the hallmarks of acute stress reactions and a central element of the negative impact of stress on hippocampus-dependent memory and cognition. Stress-induced psychopathologies, such as posttraumatic stress disorder, exhibit a sustained hyperactivity of the amygdala, triggered at least in part by deficits in GABAergic inhibition that lead to shifts in amygdalo-hippocampal interaction. Here, we have utilized lentiviral knock down of neurofascin to reduce GABAergic inhibition specifically at the axon initial segment (AIS) of principal neurons within the basolateral amygdala (BLA) of rats...
February 5, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29399665/modeling-semantic-fluency-data-as-search-on-a-semantic-network
#14
Jeffrey C Zemla, Joseph L Austerweil
Psychologists have used the semantic fluency task for decades to gain insight into the processes and representations underlying memory retrieval. Recent work has suggested that a censored random walk on a semantic network resembles semantic fluency data because it produces optimal foraging. However, fluency data have rich structure beyond being consistent with optimal foraging. Under the assumption that memory can be represented as a semantic network, we test a variety of memory search processes and examine how well these processes capture the richness of fluency data...
July 2017: CogSci: Annual Conference of the Cognitive Science Society
https://www.readbyqxmd.com/read/29397283/the-metaplastic-effects-of-nmda-receptors-blockade-on-reactivation-of-instrumental-memories-in-rats
#15
Alessandro Piva, Elisabetta Gerace, Marzia Di Chio, Lisa Osanni, Laura Padovani, Lucia Caffino, Fabio Fumagalli, Domenico E Pellegrini-Giampietro, Cristiano Chiamulera
Metaplasticity, defined as the plasticity of synaptic plasticity, could affect learning and memory at different neural levels. It was hypothesized that metaplasticity changes on glutamate receptors may affect memory destabilization, promoting or preventing reconsolidation. We investigated the metaplastic effect of NMDA channel blocker MK-801 on sucrose instrumental memory reconsolidation in a behavioural rat model associated to the assessment of molecular markers of metaplasticity, memory retrieval, destabilization and reconsolidation...
January 31, 2018: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/29396208/the-impact-of-perceptual-changes-to-studied-items-on-erp-correlates-of-familiarity-and-recollection-is-subject-to-hemispheric-asymmetries
#16
Kristina Küper, Hubert D Zimmer
It is still unclear which role the right hemisphere (RH) preference for perceptually specific and the left hemisphere (LH) bias towards abstract memory representations play at the level of episodic memory retrieval. When stimulus characteristics hampered the retrieval of abstract memory representations, these hemispheric asymmetries have previously only modulated event-related potential (ERP) correlates of recollection (late positive complex, LPC), but not of familiarity (FN400). In the present experiment, we used stimuli which facilitated the retrieval of abstract memory representations...
January 19, 2018: Brain and Cognition
https://www.readbyqxmd.com/read/29391248/knowledge-supports-memory-retrieval-through-familiarity-not-recollection
#17
Wei-Chun Wang, Nadia M Brashier, Erik A Wing, Elizabeth J Marsh, Roberto Cabeza
Semantic memory, or general knowledge of the world, guides learning and supports the formation and retrieval of new episodic memories. Behavioral evidence suggests that this knowledge effect is supported by recollection-a more controlled form of memory retrieval generally accompanied by contextual details-to a greater degree than familiarity-a more automatic form of memory retrieval generally absent of contextual details. In the current study, we used functional magnetic resonance imaging (fMRI) to investigate the role that regions associated with recollection and familiarity play in retrieving recent instances of known (e...
January 29, 2018: Neuropsychologia
https://www.readbyqxmd.com/read/29389352/memory-as-perception-of-the-past-compressed-time-inmind-and-brain
#18
REVIEW
Marc W Howard
In the visual system retinal space is compressed such that acuity decreases further from the fovea. Different forms of memory may rely on a compressed representation of time, manifested as decreased accuracy for events that happened further in the past. Neurophysiologically, "time cells" show receptive fields in time. Analogous to the compression of visual space, time cells show less acuity for events further in the past. Behavioral evidence suggests memory can be accessed by scanning a compressed temporal representation, analogous to visual search...
February 2018: Trends in Cognitive Sciences
https://www.readbyqxmd.com/read/29389163/why-consumers-misattribute-sponsorships-to-non-sponsor-brands-differential-roles-of-item-and-relational-communications
#19
Clinton S Weeks, Michael S Humphreys, T Bettina Cornwell
Brands engaged in sponsorship of events commonly have objectives that depend on consumer memory for the sponsor-event relationship (e.g., sponsorship awareness). Consumers however, often misattribute sponsorships to nonsponsor competitor brands, indicating erroneous memory for these relationships. The current research uses an item and relational memory framework to reveal sponsor brands may inadvertently foster this misattribution when they communicate relational linkages to events. Effects can be explained via differential roles of communicating item information (information that supports processing item distinctiveness) versus relational information (information that supports processing relationships among items) in contributing to memory outcomes...
February 1, 2018: Journal of Experimental Psychology. Applied
https://www.readbyqxmd.com/read/29339310/distant-from-input-evidence-of-regions-within-the-default-mode-network-supporting-perceptually-decoupled-and-conceptually-guided-cognition
#20
Charlotte Murphy, Elizabeth Jefferies, Shirley-Ann Rueschemeyer, Mladen Sormaz, Hao-Ting Wang, Daniel S Margulies, Jonathan Smallwood
The default mode network supports a variety of mental operations such as semantic processing, episodic memory retrieval, mental time travel and mind-wandering, yet the commonalities between these functions remains unclear. One possibility is that this system supports cognition that is independent of the immediate environment; alternatively or additionally, it might support higher-order conceptual representations that draw together multiple features. We tested these accounts using a novel paradigm that separately manipulated the availability of perceptual information to guide decision-making and the representational complexity of this information...
January 12, 2018: NeuroImage
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