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https://www.readbyqxmd.com/read/28425471/nonspecific-synaptic-plasticity-improves-the-recognition-of-sparse-patterns-degraded-by-local-noise
#1
Karen Safaryan, Reinoud Maex, Neil Davey, Rod Adams, Volker Steuber
Many forms of synaptic plasticity require the local production of volatile or rapidly diffusing substances such as nitric oxide. The nonspecific plasticity these neuromodulators may induce at neighboring non-active synapses is thought to be detrimental for the specificity of memory storage. We show here that memory retrieval may benefit from this non-specific plasticity when the applied sparse binary input patterns are degraded by local noise. Simulations of a biophysically realistic model of a cerebellar Purkinje cell in a pattern recognition task show that, in the absence of noise, leakage of plasticity to adjacent synapses degrades the recognition of sparse static patterns...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28419641/neural-correlates-of-experimental-trauma-memory-retrieval
#2
Geraldine A Gvozdanovic, Philipp Stämpfli, Erich Seifritz, Björn Rasch
OBJECTIVES: Traumatic memories such as intrusions and flashbacks play a major role in the development and maintenance of post-traumatic stress disorder (PTSD). A thorough understanding of the neural mechanisms underlying traumatic memories is indispensable for precise diagnosis, for personalized treatment and prevention. In particular, the identification of early neural predictor variables for intrusion development shortly after trauma exposure requires detailed investigation. EXPERIMENTAL DESIGN: Here, we examined the neural correlates of early experimental trauma memory retrieval in a traumatic film paradigm in 42 young healthy females, using both implicit and explicit retrieval tasks...
April 17, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28413697/acute-ethanol-exposure-during-late-mouse-neurodevelopment-results-in-long-term-deficits-in-memory-retrieval-but-not-in-social-responsiveness
#3
Katherine Houlé, Myshake Abdi, Erin B D Clabough
OBJECTIVE: Prenatal alcohol exposure can result in neurological changes in affected individuals and may result in the emergence of a broad spectrum of neurobehavioral abnormalities termed fetal alcohol spectrum disorders (FASD). The effects of ethanol exposure during development are both time and dose dependent. Although many animal models of FASD use more chronic ethanol exposure, acute developmental alcohol exposure may also cause long-lasting neuronal changes. Our research employed behavioral measures to assess the effects of a single early postnatal ethanol intoxication event in mice...
April 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28412502/enriched-environment-effects-on-remote-object-recognition-memory
#4
Riccardo Melani, Gabriele Chelini, Maria Cristina Cenni, Nicoletta Berardi
Since Ebbinghaus' classical work on oblivion and saving effects, we know that declarative memories may become at first spontaneously irretrievable and only subsequently completely extinguished. Recently, this time-dependent path towards memory-trace loss has been shown to correlate with different patterns of brain activation. Environmental enrichment (EE) enhances learning and memory and affects system memory consolidation. However, there is no evidence on whether and how EE could affect the time-dependent path towards oblivion...
April 12, 2017: Neuroscience
https://www.readbyqxmd.com/read/28404231/modulation-of-sensorimotor-circuits-during-retrieval-of-negative-autobiographical-memories-exploring-the-impact-of-personality-dimensions
#5
Ludovico Mineo, Carmen Concerto, Dhaval Patel, Tyrone Mayorga, Eileen Chusid, Carmenrita Infortuna, Eugenio Aguglia, Yasmin Sarraf, Fortunato Battaglia
Autobiographical Memory (AM) retrieval refers to recollection of experienced past events. Previous Transcranial Magnetic Stimulation (TMS) studies have shown that presentation of emotional negative stimuli affects human motor cortex excitability resulting in larger motor evoked potentials (MEPs). Up to date no TMS studies have been carried out in order to investigate the effect of personal memories with negative emotional value on corticospinal excitability. In this study we hypothesized that negative AM retrieval will modulate corticomotor excitability and sensorimotor integration as determined by TMS neurophysiological parameters...
April 9, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28402573/humor-drawings-evoked-temporal-and-spectral-eeg-processes
#6
Regina W Y Wang, Hsien-Chu Kuo, Shang-Wen Chuang
The study aimed to explore the humor processing elicited through the manipulation of artistic drawings. Using the Comprehension-Elaboration Theory of humor as the main research background, the experiment manipulated the head portraits of celebrities based on the independent variables of facial deformation (large/small) and addition of affective features (positive/negative). A 64-channel electroencephalography was recorded in 30 participants while viewing the incongruous drawings of celebrities. The electroencephalography temporal and spectral responses were measured during the three stages of humor which included incongruity detection, incongruity comprehension and elaboration of humor...
April 11, 2017: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/28402561/the-role-of-the-default-mode-network-in-component-processes-underlying-the-wandering-mind
#7
Giulia L Poerio, Mladen Sormaz, Hao-Ting Wang, Daniel Margulies, Elizabeth Jefferies, Jonathan Smallwood
Experiences such as mind-wandering illustrate that cognition is not always tethered to events in the here-and-now. Although converging evidence emphasises the default mode network (DMN) in mind-wandering, its precise contribution remains unclear. The DMN comprises cortical regions that are maximally distant from primary sensory and motor cortex, a topological location that may support the stimulus-independence of mind-wandering. The DMN is functionally heterogeneous, comprising regions engaged by memory, social cognition, and planning; processes relevant to mind-wandering content...
March 21, 2017: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/28398162/control-over-interfering-memories-in-eating-disorders
#8
Davide Francesco Stramaccia, Barbara Penolazzi, Arianna Libardi, Aldo Genovese, Luigi Castelli, Daniela Palomba, Giovanni Galfano
INTRODUCTION: Recent studies have suggested that patients suffering from either anorexia nervosa (AN) or bulimia nervosa (BN) exhibit abnormal performance in the ability to control cognitive interference in response selection. METHOD: We assessed the status of cognitive control in episodic memory by addressing the ability to inhibit interfering memories. To this end, we used the retrieval-practice paradigm, which allows for measuring both the beneficial and the detrimental effects of memory practice...
April 11, 2017: Journal of Clinical and Experimental Neuropsychology
https://www.readbyqxmd.com/read/28394161/abrupt-strategy-change-underlies-gradual-performance-change-bayesian-hierarchical-models-of-component-and-aggregate-strategy-use
#9
Sarah K A Wynton, Jeromy Anglim
While researchers have often sought to understand the learning curve in terms of multiple component processes, few studies have measured and mathematically modeled these processes on a complex task. In particular, there remains a need to reconcile how abrupt changes in strategy use can co-occur with gradual changes in task completion time. Thus, the current study aimed to assess the degree to which strategy change was abrupt or gradual, and whether strategy aggregation could partially explain gradual performance change...
April 10, 2017: Journal of Experimental Psychology. Learning, Memory, and Cognition
https://www.readbyqxmd.com/read/28391399/infant-avoidance-training-alters-cellular-activation-patterns-in-prefronto-limbic-circuits-during-adult-avoidance-learning-i-cellular-imaging-of-neurons-expressing-the-synaptic-plasticity-early-growth-response-protein-1-egr1
#10
Nicole Gröger, Anja Mannewitz, Jörg Bock, Tony Fernando de Schultz, Katja Guttmann, Gerd Poeggel, Katharina Braun
Both positive feedback learning and negative feedback learning are essential for adapting and optimizing behavioral performance. There is increasing evidence in humans and animals that the ability of negative feedback learning emerges postnatally. Our work in rats, using a two-way active avoidance task (TWA) as an experimental paradigm for negative feedback learning, revealed that medial and lateral prefrontal regions of infant rats undergo dramatic synaptic reorganization during avoidance training, resulting in improved avoidance learning in adulthood...
April 8, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28387587/multiple-object-tracking-as-a-tool-for-parametrically-modulating-memory-reactivation
#11
Jordan Poppenk, Ken A Norman
Converging evidence supports the "nonmonotonic plasticity" hypothesis that, although complete retrieval may strengthen memories, partial retrieval weakens them. Yet, the classic experimental paradigms used to study effects of partial retrieval are not ideally suited to doing so, because they lack the parametric control needed to ensure that the memory is activated to the appropriate degree (i.e., that there is some retrieval but not enough to cause memory strengthening). Here, we present a novel procedure designed to accommodate this need...
April 7, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28378772/activation-of-perineuronal-net-expressing-excitatory-neurons-during-associative-memory-encoding-and-retrieval
#12
Shota Morikawa, Yuji Ikegaya, Minoru Narita, Hideki Tamura
Perineuronal nets (PNNs), proteoglycan-rich extracellular matrix structures, are thought to be expressed around inhibitory neurons and contribute to critical periods of brain function and synaptic plasticity. However, in some specific brain regions such as the amygdala, PNNs were predominantly expressed around excitatory neurons. These neurons were recruited during auditory fear conditioning and memory retrieval. Indeed, the activation of PNN-expressing excitatory neurons predicted cognitive performance.
April 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28378282/the-aftermath-of-memory-retrieval-for-recycling-visual-working-memory-representations
#13
Hyung-Bum Park, Weiwei Zhang, Joo-Seok Hyun
We examined the aftermath of accessing and retrieving a subset of information stored in visual working memory (VWM)-namely, whether detection of a mismatch between memory and perception can impair the original memory of an item while triggering recognition-induced forgetting for the remaining, untested items. For this purpose, we devised a consecutive-change detection task wherein two successive testing probes were displayed after a single set of memory items. Across two experiments utilizing different memory-testing methods (whole vs...
April 4, 2017: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/28374960/neural-mechanisms-underlying-the-reward-related-enhancement-of-motivation-when-remembering-episodic-memories-with-high-difficulty
#14
Yayoi Shigemune, Takashi Tsukiura, Rui Nouchi, Toshimune Kambara, Ryuta Kawashima
The motivation to receive rewards enhances episodic memories, and the motivation is modulated by task difficulty. In episodic retrieval, however, functional neuroimaging evidence regarding the motivation that mediates interactions between reward and task difficulty is scarce. The present fMRI study investigated this issue. During encoding performed without fMRI, participants encoded Japanese words using either deep or shallow strategies, which led to variation in difficulty level during subsequent retrieval...
April 4, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28366664/memory-retrieval-re-activates-erk1-2-signaling-in-the-same-set-of-ca1-neurons-recruited-during-conditioning
#15
Cristina Zamorano, Jordi Fernández, Daniel R Storm, Xavier Carné, Carlos Sindreu
The hippocampus enables a range of behaviors through its intrinsic circuits and concerted actions with other brain regions. One such important function is the retrieval of episodic memories. How hippocampal cells support retrieval of contextual fear memory remains largely unclear. Here we monitored phospho-activation of extracellular-regulated kinase (Erk1/2) across neuronal populations of the hippocampus to find that CA1 pyramidal neurons, but not cells in CA3 or dentate gyrus, specifically respond to retrieval of an aversive context...
March 31, 2017: Neuroscience
https://www.readbyqxmd.com/read/28361564/superior-episodic-memory-in-inconsistent-handers-a-replication-and-extension-using-fnirs
#16
Ruth E Propper, Neil Patel, Stephen D Christman, Christophe Carlei
A large body of evidence supports the existence of a robust handedness difference in episodic memory retrieval, with inconsistent-handedness being associated with superior memory across a wide variety of paradigms, including superior retrieval of lab-based and real world memories. Despite superior episidoc memory in inconsistent-handers, and despite neuroanatomical and neurophysiological differences in cortical regions between inconsistent- and consistent-handers, we are aware of no studies to date that have examined physiological activity in the brains of inconsistent- versus consistent-handers while engaged in memory tasks...
March 31, 2017: Memory
https://www.readbyqxmd.com/read/28351021/effects-of-handedness-saccadic-bilateral-eye-movements-on-the-specificity-of-past-autobiographical-memory-episodic-future-thinking
#17
Andrew Parker, Adam Parkin, Neil Dagnall
The present research investigated the effects of personal handedness and saccadic eye movements on the specificity of past autobiographical memory and episodic future thinking. Handedness and saccadic eye movements have been hypothesised to share a common functional basis in that both influence cognition through hemispheric interaction. The technique used to elicit autobiographical memory and episodic future thought involved a cued sentence completion procedure that allowed for the production of memories spanning the highly specific to the very general...
June 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28347878/memory-guided-drawing-training-increases-granger-causal-influences-from-the-perirhinal-cortex-to-v1-in-the-blind
#18
Laura Cacciamani, Lora T Likova
The perirhinal cortex (PRC) is a medial temporal lobe structure that has been implicated in not only visual memory in the sighted, but also tactile memory in the blind (Cacciamani & Likova, 2016). It has been proposed that, in the blind, the PRC may contribute to modulation of tactile memory responses that emerge in low-level "visual" area V1 as a result of training-induced cortical reorganization (Likova, 2012, 2015). While some studies in the sighted have indicated that the PRC is indeed structurally and functionally connected to the visual cortex (Clavagnier, Falchier, & Kennedy, 2004; Peterson, Cacciamani, Barense, & Scalf, 2012), the PRC's direct modulation of V1 is unknown-particularly in those who lack the visual input that typically stimulates this region...
March 24, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28343962/contextually-mediated-spontaneous-retrieval-is-specific-to-the-hippocampus
#19
Nicole M Long, Michael R Sperling, Gregory A Worrell, Kathryn A Davis, Robert E Gross, Bradley C Lega, Barbara C Jobst, Sameer A Sheth, Kareem Zaghloul, Joel M Stein, Michael J Kahana
Although it is now well established that the hippocampus supports memory encoding [1, 2], little is known about hippocampal activity during spontaneous memory retrieval. Recent intracranial electroencephalographic (iEEG) work has shown that hippocampal activity during encoding predicts subsequent temporal organization of memories [3], supporting a role in contextual binding. It is an open question, however, whether the hippocampus similarly supports contextually mediated processes during retrieval. Here, we analyzed iEEG recordings obtained from 215 epilepsy patients as they performed a free recall task...
April 3, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28338795/-mom-i-don-t-want-to-hear-it-brain-response-to-maternal-praise-and-criticism-in-adolescents-with-major-depressive-disorder
#20
Jennifer S Silk, Kyung Hwa Lee, Rosalind D Elliott, Jill M Hooley, Ronald E Dahl, Anita Barber, Greg J Siegle
Recent research has implicated altered neural response to interpersonal feedback as an important factor in adolescent depression, with existing studies focusing on responses to feedback from virtual peers. We investigated whether depressed adolescents differed from healthy youth in neural response to social evaluative feedback from mothers. During neuroimaging, twenty adolescents in a current episode of major depressive disorder (MDD) and 28 healthy controls listened to previously recorded audio clips of their own mothers' praise, criticism and neutral comments...
February 17, 2017: Social Cognitive and Affective Neuroscience
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