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"Memory retrieval"

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https://www.readbyqxmd.com/read/28209980/the-contribution-of-the-human-posterior-parietal-cortex-to-episodic-memory
#1
REVIEW
Carlo Sestieri, Gordon L Shulman, Maurizio Corbetta
The posterior parietal cortex (PPC) is traditionally associated with attention, perceptual decision making and sensorimotor transformations, but more recent human neuroimaging studies support an additional role in episodic memory retrieval. In this Opinion article, we present a functional-anatomical model of the involvement of the PPC in memory retrieval. Parietal regions involved in perceptual attention and episodic memory are largely segregated and often show a push-pull relationship, potentially mediated by prefrontal regions...
February 17, 2017: Nature Reviews. Neuroscience
https://www.readbyqxmd.com/read/28203153/bold-independent-computational-entropy-assesses-functional-donut-like-structures-in-brain-fmri-images
#2
James F Peters, Sheela Ramanna, Arturo Tozzi, Ebubekir İnan
We introduce a novel method for the measurement of information level in fMRI (functional Magnetic Resonance Imaging) neural data sets, based on image subdivision in small polygons equipped with different entropic content. We show how this method, called maximal nucleus clustering (MNC), is a novel, fast and inexpensive image-analysis technique, independent from the standard blood-oxygen-level dependent signals. MNC facilitates the objective detection of hidden temporal patterns of entropy/information in zones of fMRI images generally not taken into account by the subjective standpoint of the observer...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28202612/transformed-neural-pattern-reinstatement-during-episodic-memory-retrieval
#3
Xiaoqian Xiao, Qi Dong, Jiahong Gao, Weiwei Men, Russell A Poldrack, Gui Xue
Contemporary models of episodic memory posit that remembering involves the reenactment of encoding processes. Although encoding-retrieval similarity (ERS) has been consistently reported and linked to memory success, the nature of neural pattern reinstatement is poorly understood. Using high-resolution fMRI on human subjects, our results obtained clear evidence for item-specific pattern reinstatement in the frontoparietal cortex (FPC), even when the encoding-retrieval pairs shared no perceptual similarity. No item-specific pattern reinstatement was found in the ventral visual cortex (VVC)...
February 15, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28197192/subhypnotic-doses-of-propofol-impair-spatial-memory-retrieval-in-rats
#4
Hu Liu, Ting Wang, Wei Dai, Zheng Jiang, Yuan-Hai Li, Xue-Sheng Liu
Abundant evidence indicates that propofol profoundly affects memory processes, although its specific effects on memory retrieval have not been clarified. A recent study has indicated that hippocampal glycogen synthase kinase-3β (GSK-3β) activity affects memory. Constitutively active GSK-3β is required for memory retrieval, and propofol has been shown to inhibit GSK-3β. Thus, the present study examined whether propofol affects memory retrieval, and, if so, whether that effect is mediated through altered GSK-3β activity...
December 2016: Neural Regeneration Research
https://www.readbyqxmd.com/read/28193686/paraventricular-thalamus-balances-danger-and-reward
#5
Eun A Choi, Gavan P McNally
Foraging animals balance the need to seek food and energy against the accompanying dangers of injury and predation. To do so, they rely on learning systems encoding reward and danger. Whereas much is known about these separate learning systems, little is known about how they interact to shape and guide behavior. Here we show a key role for the rat paraventricular nucleus of the thalamus (PVT), a nucleus of the dorsal midline thalamus, in this interaction. First we show behavioral competition between reward and danger: the opportunity to seek food reward negatively modulates expression of species-typical defensive behavior...
February 13, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28179554/are-there-multiple-kinds-of-episodic-memory-an-fmri-investigation-comparing-autobiographical-and-recognition-memory-tasks
#6
Hung-Yu Chen, Adrian W Gilmore, Steven M Nelson, Kathleen B McDermott
What brain regions underlie retrieval from episodic memory? The bulk of research addressing this question with fMRI has relied upon recognition memory for materials encoded within the laboratory. Another, less dominant tradition has employed autobiographical methods, whereby people recall events from their lifetime, often after being cued with words or pictures. The current study addressed how the neural substrates of successful memory retrieval differ as a function of the targeted memory when the experimental parameters were held constant in the two conditions (except for instructions)...
February 8, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28178292/differential-requirements-of-hippocampal-de-novo-protein-and-mrna-synthesis-in-two-long-term-spatial-memory-tests-spontaneous-place-recognition-and-delay-interposed-radial-maze-performance-in-rats
#7
Takaaki Ozawa, Kazuo Yamada, Yukio Ichitani
Hippocampal de novo mRNA and protein synthesis has been suggested to be critical for long-term spatial memory. However, its requirement in each memory process (i.e. encoding, consolidation and retrieval) and the differences in the roles of de novo mRNA and protein synthesis in different situations where spatial memory is tested have not been thoroughly investigated. To address these questions, we examined the effects of hippocampal administration of the protein synthesis inhibitors, anisomycin (ANI) and emetine (EME), as well as that of an mRNA synthesis inhibitor, 5,6-dichlorobenzimidazole 1-β-D-ribofuranoside (DRB), on rat performance in two long-term spatial memory tests...
2017: PloS One
https://www.readbyqxmd.com/read/28161030/brain-behavior-relationships-in-source-memory-effects-of-age-and-memory-ability
#8
Liesel-Ann Meusel, Cheryl L Grady, Patricia E Ebert, Nicole D Anderson
There is considerable evidence for age-related decrements in source memory retrieval, but the literature on the neural correlates of these impairments is mixed. In this study, we used functional magnetic resonance imaging to examine source memory retrieval-related brain activity, and the monotonic relationship between retrieval-related brain activity and source memory accuracy, as a function of both healthy aging (younger vs older) and memory ability within the older adult group (Hi-Old vs Lo-Old). Participants studied lists of word pairs, half visually, half aurally; these were re-presented visually in a scanned test phase and participants indicated if the pair was 'seen' or 'heard' in the study phase...
January 12, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28160686/knowing-me-knowing-you-resting-state-functional-connectivity-of-ventromedial-prefrontal-cortex-dissociates-memory-related-to-self-from-a-familiar-other
#9
Irene de Caso, Theodoros Karapanagiotidis, Elena Aggius-Vella, Mahiko Konishi, Daniel S Margulies, Elizabeth Jefferies, Jonathan Smallwood
Material related to the self, as well as to significant others, often displays mnemonic superiority through its associations with highly organised and elaborate representations. Neuroimaging studies suggest this effect is related to activation in regions of medial prefrontal cortex (mPFC). Incidental memory scores for trait adjectives, processed in relation to the self, a good friend and David Cameron were collected. Scores for each referent were used as regressors in seed-based analyses of resting state fMRI data performed in ventral, middle and dorsal mPFC seeds, as well as hippocampal formation...
February 1, 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28159685/retrieval-of-high-fidelity-memory-arises-from-distributed-cortical-networks
#10
Peter E Wais, Sahar Jahanikia, Daniel Steiner, Craig E L Stark, Adam Gazzaley
Medial temporal lobe (MTL) function is well established as necessary for memory of facts and events. It is likely that lateral cortical regions critically guide cognitive control processes to tune in high-fidelity details that are most relevant for memory retrieval. Here, convergent results from functional and structural MRI show that retrieval of detailed episodic memory arises from lateral cortical-MTL networks, including regions of inferior frontal and angular gyrii. Results also suggest that recognition of items based on low-fidelity, generalized information, rather than memory arising from retrieval of relevant episodic details, is not associated with functional connectivity between MTL and lateral cortical regions...
January 31, 2017: NeuroImage
https://www.readbyqxmd.com/read/28157557/elimination-of-spiral-waves-in-a-locally-connected-chaotic-neural-network-by-a-dynamic-phase-space-constraint
#11
Yang Li, Makito Oku, Guoguang He, Kazuyuki Aihara
In this study, a method is proposed that eliminates spiral waves in a locally connected chaotic neural network (CNN) under some simplified conditions, using a dynamic phase space constraint (DPSC) as a control method. In this method, a control signal is constructed from the feedback internal states of the neurons to detect phase singularities based on their amplitude reduction, before modulating a threshold value to truncate the refractory internal states of the neurons and terminate the spirals. Simulations showed that with appropriate parameter settings, the network was directed from a spiral wave state into either a plane wave (PW) state or a synchronized oscillation (SO) state, where the control vanished automatically and left the original CNN model unaltered...
January 16, 2017: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/28146250/effect-of-selective-inhibition-of-reactivated-nicotine-associated-memories-with-propranolol-on-nicotine-craving
#12
Yan-Xue Xue, Jia-Hui Deng, Ya-Yun Chen, Li-Bo Zhang, Ping Wu, Geng-Di Huang, Yi-Xiao Luo, Yan-Ping Bao, Yu-Mei Wang, Yavin Shaham, Jie Shi, Lin Lu
Importance: A relapse into nicotine addiction during abstinence often occurs after the reactivation of nicotine reward memories, either by acute exposure to nicotine (a smoking episode) or by smoking-associated conditioned stimuli (CS). Preclinical studies suggest that drug reward memories can undergo memory reconsolidation after being reactivated, during which they can be weakened or erased by pharmacological or behavioral manipulations. However, translational clinical studies using CS-induced memory retrieval-reconsolidation procedures to decrease drug craving reported inconsistent results...
February 1, 2017: JAMA Psychiatry
https://www.readbyqxmd.com/read/28146243/effect-of-a-brief-memory-updating-intervention-on-smoking-behavior-a-randomized-clinical-trial
#13
Lisa J Germeroth, Matthew J Carpenter, Nathaniel L Baker, Brett Froeliger, Steven D LaRowe, Michael E Saladin
Importance: Recent research on addiction-related memory processes suggests that protracted extinction training following brief cue-elicited memory retrieval (ie, retrieval-extinction [R-E] training) can attenuate/eradicate the ability of cues to elicit learned behaviors. One study reported that cue-elicited craving among detoxified heroin addicts was substantially attenuated following R-E training and through 6-month follow-up. Objective: To build on these impressive findings by examining whether R-E training could attenuate smoking-related craving and behavior...
February 1, 2017: JAMA Psychiatry
https://www.readbyqxmd.com/read/28144451/protective-effect-of-quinine-on-chemical-kindling-and-passive-avoidance-test-in-rats
#14
Zahra Faridkia, Parichehr Yaghmaei, Marjan Nassiri-Asl
BACKGROUND: In humans, convulsive diseases such as temporal lobe epilepsy are usually accompanied by learning and memory impairments. In recent years, the role of gap junction channels as an important target of antiepileptic drugs has been studied and discussed. Quinine, as a gap junction blocker of connexin 36, can abolish ictal epileptiform activity in brain slices. OBJECTIVES: The role of quinine in memory retrieval in pentylenetetrazole (PTZ)-kindled rats was examined using a step-through passive avoidance task...
September 2016: Iranian Red Crescent Medical Journal
https://www.readbyqxmd.com/read/28135266/memory-replay-in-balanced-recurrent-networks
#15
Nikolay Chenkov, Henning Sprekeler, Richard Kempter
Complex patterns of neural activity appear during up-states in the neocortex and sharp waves in the hippocampus, including sequences that resemble those during prior behavioral experience. The mechanisms underlying this replay are not well understood. How can small synaptic footprints engraved by experience control large-scale network activity during memory retrieval and consolidation? We hypothesize that sparse and weak synaptic connectivity between Hebbian assemblies are boosted by pre-existing recurrent connectivity within them...
January 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28131230/electrophysiological-correlates-of-semantic-memory-retrieval-in-gulf-war-syndrome-2-patients
#16
Gail D Tillman, Clifford S Calley, Virginia I Buhl, Hsueh-Sheng Chiang, Robert W Haley, John Hart, Michael A Kraut
Gulf War veterans meeting criteria for Haley Syndrome 2 of Gulf War illness endorse a particular constellation of symptoms that include difficulty with processing information, word-finding, and confusion. To explore the neural basis of their word-finding difficulty, we assessed event-related potentials (ERPs) associated with semantic memory retrieval in 22 veterans classified as Syndrome 2 and 28 veterans who served as controls. We recorded EEGs while subjects judged whether pairs of words that represented object features combined to elicit a retrieval of an object memory or no retrieval...
February 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28120933/where-there-is-smoke-there-is-fear-impaired-contextual-inhibition-of-conditioned-fear-in-smokers
#17
Jan Haaker, Tina B Lonsdorf, Dirk Schümann, Nico Bunzeck, Jan Peters, Tobias Sommer, Raffael Kalisch
The odds-ratio of smoking is elevated in populations with neuropsychiatric diseases, in particular in the highly prevalent diagnoses of post-traumatic stress and anxiety disorders. Yet, the association between smoking and a key dimensional phenotype of these disorders -maladaptive deficits in fear learning and fear inhibition-is unclear. We therefore investigated acquisition and memory of fear and fear inhibition in healthy smoking and non-smoking participants (N=349, 22% smokers). We employed a well validated paradigm of context-dependent fear and safety learning (day1) including a memory retrieval on day 2...
January 25, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28119067/changes-in-fmri-activation-in-anterior-hippocampus-and-motor-cortex-during-memory-retrieval-after-an-intense-exercise-intervention
#18
Gerd Wagner, Marco Herbsleb, Feliberto de la Cruz, Andy Schumann, Stefanie Köhler, Christian Puta, Holger W Gabriel, Jürgen R Reichenbach, Karl-Jürgen Bär
Strong evidence indicates that regular aerobic training induces beneficial effects on cognitive functions. The present controlled fMRI study was designed to investigate the impact of a short-term intense aerobic exercise on the pattern of functional activation during the retrieval of learned pair-associates in 17 young and healthy male adults compared to 17 matched control subjects. We further aimed to relate putative changes in hippocampal activation to postulated changes in the exercised-induced brain derived neurotrophic factor (BDNF)...
January 21, 2017: Biological Psychology
https://www.readbyqxmd.com/read/28114289/optogenetic-inhibition-of-behavior-with-anion-channelrhodopsins
#19
Farhan Mohammad, James C Stewart, Stanislav Ott, Katarina Chlebikova, Jia Yi Chua, Tong-Wey Koh, Joses Ho, Adam Claridge-Chang
Optogenetics uses light exposure to manipulate physiology in genetically modified organisms. Abundant tools for optogenetic excitation are available, but the limitations of current optogenetic inhibitors present an obstacle to demonstrating the necessity of neuronal circuits. Here we show that anion channelrhodopsins can be used to specifically and rapidly inhibit neural systems involved in Drosophila locomotion, wing expansion, memory retrieval and gustation, thus demonstrating their broad utility in the circuit analysis of behavior...
January 23, 2017: Nature Methods
https://www.readbyqxmd.com/read/28112460/from-hippocampus-to-whole-brain-the-role-of-integrative-processing-in-episodic-memory-retrieval
#20
Benjamin R Geib, Matthew L Stanley, Nancy A Dennis, Marty G Woldorff, Roberto Cabeza
Multivariate functional connectivity analyses of neuroimaging data have revealed the importance of complex, distributed interactions between disparate yet interdependent brain regions. Recent work has shown that topological properties of functional brain networks are associated with individual and group differences in cognitive performance, including in episodic memory. After constructing functional whole-brain networks derived from an event-related fMRI study of memory retrieval, we examined differences in functional brain network architecture between forgotten and remembered words...
January 23, 2017: Human Brain Mapping
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