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"Memory retrieval"

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https://www.readbyqxmd.com/read/29667267/the-cerebellum-after-trauma-resting-state-functional-connectivity-of-the-cerebellum-in-posttraumatic-stress-disorder-and-its-dissociative-subtype
#1
Daniela Rabellino, Maria Densmore, Jean Théberge, Margaret C McKinnon, Ruth A Lanius
The cerebellum plays a key role not only in motor function but also in affect and cognition. Although several psychopathological disorders have been associated with overall cerebellar dysfunction, it remains unclear whether different regions of the cerebellum contribute uniquely to psychopathology. Accordingly, we compared seed-based resting-state functional connectivity of the anterior cerebellum (lobule IV-V), of the posterior cerebellum (Crus I), and of the anterior vermis across posttraumatic stress disorder (PTSD; n = 65), its dissociative subtype (PTSD + DS; n = 37), and non-trauma-exposed healthy controls (HC; n = 47)...
April 17, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29666262/spatial-and-temporal-heterogeneity-of-neural-responses-in-human-posteromedial-cortex
#2
Amy L Daitch, Josef Parvizi
Neuroimaging evidence supports a role of the default mode network (DMN) in spontaneous thought and goal-driven internally oriented processes, such as recalling an autobiographical event, and has demonstrated its deactivation during focused, externally oriented attention. Recent work suggests that the DMN is not a homogeneous network but rather is composed of at least several subnetworks, which are engaged in distinct functions; however, it is still unclear if these different functions rely on the same neuronal populations...
April 16, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29663136/memory-retrieval-induced-activation-of-adult-born-neurons-generated-in-response-to-damage-to-the-dentate-gyrus
#3
Andrea Aguilar-Arredondo, Angélica Zepeda
The dentate gyrus (DG) is a neurogenic structure that exhibits functional and structural reorganization after injury. Neurogenesis and functional recovery occur after brain damage, and the possible relation between both processes is a matter of study. We explored whether neurogenesis and the activation of new neurons correlated with DG recovery over time. We induced a DG lesion in young adult rats through the intrahippocampal injection of kainic acid and analyzed functional recovery and the activation of new neurons after animals performed a contextual fear memory task (CFM) or a control spatial exploratory task...
April 16, 2018: Brain Structure & Function
https://www.readbyqxmd.com/read/29661833/no-is-required-for-memory-formation-and-expression-of-memory-and-for-minor-behavioral-changes-during-training-with-inedible-food-in-aplysia
#4
Valeria Briskin-Luchinsky, Shlomit Tam, Shlomit Shabbat, Itay Hurwitz, Abraham J Susswein
A learning experience may lead to changes in behavior during the experience, and also to memory expressed at a later time. Are signals causing changes in behavior during the learning experience related to the formation and expression of memory? We examined this question, using learning that food is inedible in Aplysia Treatment of an isolated buccal ganglia preparation with an NO donor elicited rejection-like motor programs. Rejection initiated by NO production is consistent with aspects of behavioral changes seen while animals learn, and with memory formation...
May 2018: Learning & Memory
https://www.readbyqxmd.com/read/29661486/pre-encoding-stress-induced-changes-in-perceived-stress-blood-pressure-and-cortisol-are-differentially-associated-with-recollection-and-familiarity
#5
Uta S Wiemers, Tanja C Hamacher-Dang, Andrew P Yonelinas, Oliver T Wolf
Stress before encoding is often linked to impaired memory. Further influences of stress on memory are arousal of the to be learned material and memory retrieval type (free recall vs. recognition). In the current study we tested the influence of stress on memory encoding for neutral and negative arousing pictures in healthy young adults. A total of 80 participants (40 men) were subjected either to the socially evaluated cold pressure test or a control condition before encoding of arousing and neutral pictures...
April 13, 2018: Brain and Cognition
https://www.readbyqxmd.com/read/29615486/human-episodic-memory-retrieval-is-accompanied-by-a-neural-contiguity-effect
#6
Sarah Folkerts, Ueli Rutishauser, Marc W Howard
Cognitive psychologists have long hypothesized that experiences are encoded in a temporal context that changes gradually over time. When an episodic memory is retrieved, the state of context is recovered-a jump back in time. We recorded from single units in the MTL of epilepsy patients performing an item recognition task. The population vector changed gradually over minutes during presentation of the list. When a probe from the list was remembered with high confidence, the population vector reinstated the temporal context of the original presentation of that probe during study-a neural contiguity effect that provides a possible mechanism for behavioral contiguity effects...
April 3, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29607689/curcumin-and-resveratrol-rescue-cortical-hippocampal-system-from-chronic-fluoride-induced-neurodegeneration-and-enhance-memory-retrieval
#7
Chhavi Sharma, Pooja Suhalka, Maheep Bhatnagar
OBJECTIVE: The aim of this study were: (1) To evaluate neuroprotective effect of Resveratrol and Curcumin on NADPH-d (Nicotinamide adenine dinucleotide phosphate diaphorase) activity in neuronal cell in sub regions of mice brain (2) To evaluate the effects on antioxidant status, and (3) To evaluate the protective effects of phytochemicals on learning and memory following fluoride exposure. METHOD: Young Mice (one month old, B.W. 30±5mg) were provided to 120 ppm sodium fluoride dissolved in drinking water...
April 2, 2018: International Journal of Neuroscience
https://www.readbyqxmd.com/read/29604457/lateral-prefrontal-cortex-lesion-impairs-regulation-of-internally-and-externally-directed-attention
#8
Julia W Y Kam, Anne-Kristin Solbakk, Tor Endestad, Torstein R Meling, Robert T Knighta
Our capacity to flexibly shift between internally and externally directed attention is crucial for successful performance of activities in our daily lives. Neuroimaging studies have implicated the lateral prefrontal cortex (LPFC) in both internally directed processes, including autobiographical memory retrieval and future planning, and externally directed processes, including cognitive control and selective attention. However, the causal involvement of the LPFC in regulating internally directed attention states is unknown...
March 28, 2018: NeuroImage
https://www.readbyqxmd.com/read/29589592/developing-a-hippocampal-neural-prosthetic-to-facilitate-human-memory-encoding-and-recall
#9
Robert E Hampson, Dong Song, Brian S Robinson, Dustin Fetterhoff, Alexander S Dakos, Brent M Roeder, Xiwei She, Robert T Wicks, Mark R Witcher, Daniel E Couture, Adrian W Laxton, Heidi Munger-Clary, Gautam Popli, Myriam J Sollman, Christopher T Whitlow, Vasilis Z Marmarelis, Theodore W Berger, Sam A Deadwyler
OBJECTIVE: We demonstrate here the first successful implementation in humans of a proof-of-concept system for restoring and improving memory function via facilitation of memory encoding using the patient's own hippocampal spatiotemporal neural codes for memory. Memory in humans is subject to disruption by drugs, disease and brain injury, yet previous attempts to restore or rescue memory function in humans typically involved only nonspecific, modulation of brain areas and neural systems related to memory retrieval...
March 28, 2018: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29571716/mapping-working-memory-retrieval-in-space-and-in-time-a-combined-electroencephalography-and-electrocorticography-approach
#10
Qiong Zhang, Marieke van Vugt, Jelmer P Borst, John R Anderson
In this study, we investigated the time course and neural correlates of the retrieval process underlying visual working memory. We made use of a rare dataset in which the same task was recorded using both scalp electroencephalography (EEG) and Electrocorticography (ECoG), respectively. This allowed us to examine with great spatial and temporal detail how the retrieval process works, and in particular how the medial temporal lobe (MTL) is involved. In each trial, participants judged whether a probe face had been among a set of recently studied faces...
March 20, 2018: NeuroImage
https://www.readbyqxmd.com/read/29559939/internet-search-alters-intra-and-inter-regional-synchronization-in-the-temporal-gyrus
#11
Xiaoyue Liu, Xiao Lin, Ming Zheng, Yanbo Hu, Yifan Wang, Lingxiao Wang, Xiaoxia Du, Guangheng Dong
Internet search changed the way we store and recall information and possibly altered our brain functions. Previous studies suggested that Internet search facilitates the information-acquisition process. However, this process may cause individuals to lose the ability to store and recollect specific contents. Despite the numerous behavioral studies conducted in this field, little is known about the neural mechanisms underlying Internet searches. The present study explores potential brain activity changes induced by Internet search...
2018: Frontiers in Psychology
https://www.readbyqxmd.com/read/29553763/can-t-get-it-out-of-my-mind-a-systematic-review-of-predictors-of-intrusive-memories-of-distressing-events
#12
Elizabeth H Marks, Anna R Franklin, Lori A Zoellner
Intrusive memories, when persistent and distressing, are theorized to underlie a range of transdiagnostic psychological symptoms and associated impairment. However, little is known about factors predicting the development and persistence of intrusive memories. The aim of this systematic review is to evaluate the literature on pre-event, event-based, and post-event predictors of intrusive memories. A systematic review was conducted, searching for studies that examined intrusive, event-based memories. One hundred and six articles were identified from PsycInfo, PubMed, and Medline databases...
March 19, 2018: Psychological Bulletin
https://www.readbyqxmd.com/read/29530454/neuropharmacological-evaluation-on-four-traditional-herbs-used-as-nervine-tonic-and-commonly-available-as-shankhpushpi-in-india
#13
Neeraj K Sethiya, Alok Nahata, Pawan Kumar Singh, S H Mishra
OBJECTIVE: The present study was undertaken to evaluate the neuropharmacological effect of four herbs commonly identified as source of Shankhpushpi. BACKGROUND: Shankhpushpi is an Ayurvedic drug, widely used for its actions on the central nervous system, especially to improve intellect and boost memory. Four botanicals viz. Canscora decussata Schult. (CD), Clitorea ternatea Linn. (CT), Convolvulus pluricaulis Choisy. (CP) and Evolvulus alsinoides Linn. (EA) are considered as sources of Shankhpushpi by Indian practitioners on the basis of their morphological descriptions given in ancient texts...
March 9, 2018: Journal of Ayurveda and Integrative Medicine
https://www.readbyqxmd.com/read/29518564/neural-and-genetic-determinants-of-creativity
#14
Zhaowen Liu, Jie Zhang, Xiaohua Xie, Edmund T Rolls, Jiangzhou Sun, Kai Zhang, Zeyu Jiao, Qunlin Chen, Junying Zhang, Jiang Qiu, Jianfeng Feng
Creative thinking plays a vital role in almost all aspects of human life. However, little is known about the neural and genetic mechanisms underlying creative thinking. Based on a cross-validation based predictive framework, we searched from the whole-brain connectome (34,716 functional connectivities) and whole genome data (309,996 SNPs) in two datasets (all collected by Southwest University, Chongqing) consisting of altogether 236 subjects, for a better understanding of the brain and genetic underpinning of creativity...
March 5, 2018: NeuroImage
https://www.readbyqxmd.com/read/29518437/spatial-information-is-preferentially-processed-by-the-distal-part-of-ca3-implication-for-memory-retrieval
#15
Vera Flasbeck, Erika Atucha, Nozomu H Nakamura, Motoharu Yoshida, Magdalena M Sauvage
For the past decades, CA3 was considered as a single functional entity. However, strong differences between the proximal (close to the dentate gyrus) and the distal (close to CA2) parts of CA3 in terms of connectivity patterns, gene expression and electrophysiological properties suggest that it is not the case. We recently showed that proximal CA3 (together with distal CA1) preferentially deals with non-spatial information [1]. In contrast to proximal CA3, distal CA3 mainly receives and predominantly projects to spatially tuned areas...
March 5, 2018: Behavioural Brain Research
https://www.readbyqxmd.com/read/29501971/seeing-life-through-rose-colored-spectacles-autobiographical-memory-as-experienced-in-korsakoff-s-syndrome
#16
Mohamad El Haj, Jean Louis Nandrino
We investigated whether patients with Korsakjoff's Sybdrome (KS) would demonstrate a discrepancy between (low) autobiographical specificity and (high) sense of reliving. We invited 20 KS patients and 24 controls to retrieve personal memories. After memory retrieval, they were invited to rate subjective characteristics of their recall (e.g., reliving, travel in time, remembering, realness). Besides this rating, we analyzed memories objectively with regard to specificity. Analysis demonstrated poorer sense of reliving and memory specificity in KS patients than in controls...
March 1, 2018: Consciousness and Cognition
https://www.readbyqxmd.com/read/29501527/retigabine-ameliorates-acute-stress-induced-impairment-of-spatial-memory-retrieval-through-regulating-usp2-signaling-pathways-in-hippocampal-ca1-area
#17
Cai Li, Ji Zhang, Haiwei Xu, Mujun Chang, Chuntao Lv, Wenhua Xue, Zhizhen Song, Lizhen Zhang, Xiaojian Zhang, Xin Tian
Acute stress could trigger maladaptive changes associated with stress-related cognitive and emotional deficits. Dysfunction of ion channel or receptor in the hippocampal area has been linked to the cognitive deficits induced by stress. It is known that Kv7 channel openers, including FDA-approved drug retigabine, show cognitive protective efficacy. However, the underlying molecular mechanisms remain elusive. Here we showed that exposing adult male rats to acute stress significantly impaired the spatial memory, a cognitive process controlled by the hippocampus...
March 1, 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29499085/left-hippocampal-dosimetry-correlates-with-visual-and-verbal-memory-outcomes-in-survivors-of-pediatric-brain-tumors
#18
Andrew H Zureick, Casey L Evans, Andrzej Niemierko, Julie A Grieco, Alexandra J Nichols, Barbara C Fullerton, Clayton B Hess, Claire P Goebel, Sara L Gallotto, Elizabeth A Weyman, Dillon E Gaudet, Jessica A Nartowicz, David H Ebb, Robin M Jones, Shannon M MacDonald, Nancy J Tarbell, Torunn I Yock, Margaret B Pulsifer
BACKGROUND: Radiotherapy (RT) in the pediatric brain tumor population causes late neurocognitive effects. In the current study, the authors investigated associations between clinical and dosimetric risk factors and memory outcomes in a cohort of patients treated with proton radiotherapy (PRT). METHODS: A total of 70 patients (median age at PRT, 12.1 years [range, 5.0-22.5 years]) who were treated with PRT were identified with baseline and follow-up evaluations of visual and verbal memory (Children's Memory Scale and the third edition of the Wechsler Memory Scale)...
March 2, 2018: Cancer
https://www.readbyqxmd.com/read/29494179/age-differences-in-memory-for-meaningful-and-arbitrary-associations-a-memory-retrieval-account
#19
Tarek Amer, Kelly S Giovanello, Cheryl L Grady, Lynn Hasher
Older adults typically show poor associative memory performance relative to younger adults. This age-related effect, however, is mediated by the meaningfulness of the materials used, such that age differences are minimized with the use of information that is consistent with prior knowledge. While this effect has been interpreted as facilitative learning through schematic support, the role of memory retrieval on this effect has yet to be explored. Using an associative memory paradigm that varied the extent of controlled retrieval for previously studied meaningful or arbitrary associations, older and younger adults in the present study retrieved realistic and unrealistic grocery item prices in a speeded, or in a slow, more control-based retrieval condition...
February 2018: Psychology and Aging
https://www.readbyqxmd.com/read/29477414/acute-stress-negatively-affects-object-recognition-early-memory-consolidation-and-memory-retrieval-unrelated-to-state-dependency
#20
Ellis Nelissen, Jos Prickaerts, Arjan Blokland
It is well known that stress affects memory performance. However, there still appears to be inconstancy in literature about how acute stress affects the different stages of memory: acquisition, consolidation and retrieval. In this study, we exposed rats to acute stress and measured the effect on memory performance in the object recognition task as a measure for episodic memory. Stress was induced 30 min prior to the learning phase to affect acquisition, directly after the learning phase to affect consolidation, or 30 min before the retrieval phase to affect retrieval...
February 22, 2018: Behavioural Brain Research
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