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https://www.readbyqxmd.com/read/28821999/developmental-neurotoxicity-of-the-hippocampus-following-in-utero-exposure-to-methylmercury-impairment-in-cell-signaling
#1
Luana Heimfarth, Jeferson Delgado, Moara Rodrigues Mignori, Daniel Pens Gelain, José Cláudio Fonseca Moreira, Regina Pessoa-Pureur
In this study, we assessed some hippocampal signaling cascades and behavioral impairments in 30-day-old rat pups prenatally exposed to methylmercury (MeHg). Pregnant rats were exposed to 1.0 or 2.0 mg/kg MeHg by gavage in alternated days from gestational day 5 until parturition. We found increased anxiety-like and decreased exploration behavior evaluated by open field test and deficit of both short- and long-term memories by novel object recognition task, respectively, in MeHg-treated pups. Downregulated PI3K/Akt/mTOR pathway and activated/hypophosphorylated (Ser9) GSK3β in MeHg-treated pups could be upstream of hyperphosphorylated Tau (Ser396) destabilizing microtubules and contributing to neural dysfunction in the hippocampus of these rats...
August 18, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/28821812/crows-rival-monkeys-in-cognitive-capacity
#2
Dmitry Balakhonov, Jonas Rose
The present study compares the 'bandwidth of cognition' between crows and primates. Working memory is the ability to maintain and manipulate information over short periods of time - a core component of cognition. The capacity of working memory is tightly limited, in humans correlated with individual intelligence and commonly used synonymously with cognitive capacity. Crows have remarkable cognitive skills and while birds and mammals share neural principles of working memory, its capacity has not been tested in crows...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821446/diet-induced-obesity-alters-memory-consolidation-in-female-rats
#3
P Zanini, B D Arbo, G Niches, D Czarnabay, F Benetti, M F Ribeiro, A L Cecconello
Obesity is a multifactorial disease characterized by the abnormal or excessive fat accumulation, which is caused by an energy imbalance between consumed and expended calories. Obesity leads to an inflammatory response that may result in peripheral and central metabolic changes, including insulin and leptin resistance. Insulin and leptin resistance have been associated with metabolic and cognitive dysfunctions. Obesity and some neurodegenerative diseases that lead to dementia affect mainly women. However, the effects of diet-induced obesity on memory consolidation in female rats are poorly understood...
August 15, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28821209/cued-memory-reactivation-during-sws-abolishes-the-beneficial-effect-of-sleep-on-abstraction
#4
Nora Hennies, Matthew A Lambon Ralph, Simon J Durrant, James N Cousins, Penelope A Lewis
Study Objectives: Extracting regularities from stimuli in our environment and generalizing these to new situations are fundamental processes in human cognition. Sleep has been shown to enhance these processes, possibly by facilitating reactivation-triggered memory reorganization. Here, we assessed whether cued reactivation during slow wave sleep (SWS) promotes the beneficial effect of sleep on abstraction of statistical regularities. Methods: We used an auditory statistical learning task, in which the benefit of sleep has been firmly established...
August 1, 2017: Sleep
https://www.readbyqxmd.com/read/28820674/restoration-of-fmri-decodability-does-not-imply-latent-working-memory-states
#5
Sebastian Schneegans, Paul M Bays
Recent imaging studies have challenged the prevailing view that working memory is mediated by sustained neural activity. Using machine learning methods to reconstruct memory content, these studies found that previously diminished representations can be restored by retrospective cueing or other forms of stimulation. These findings have been interpreted as evidence for an activity-silent working memory state that can be reactivated dependent on task demands. Here, we test the validity of this conclusion by formulating a neural process model of working memory based on sustained activity and using this model to emulate a spatial recall task with retro-cueing...
August 18, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28819993/lactobacillus-helveticus-fermented-milk-containing-lactononadecapeptide-nippltqtpvvvppflqpe-improves-cognitive-function-in-healthy-middle-aged-adults-a-randomised-double-blind-placebo-controlled-trial
#6
Kazuhito Ohsawa, Fumiya Nakamura, Naoto Uchida, Seiichi Mizuno, Hidehiko Yokogoshi
This study aimed to determine the effects of a Lactobacillus helveticus-fermented milk drink containing lactononadecapeptide (NIPPLTQTPVVVPPFLQPE) on the cognitive function of healthy middle-aged adults. A randomised, double-blind controlled study was conducted in healthy participants who were randomly assigned to receive a L. helveticus-fermented milk drink (190 g/day) or the equivalent amount of a placebo drink once a day for eight weeks. Cognitive function was evaluated using the Japanese version of the repeatable battery for the assessment of neuropsychological status (RBANS) test...
August 18, 2017: International Journal of Food Sciences and Nutrition
https://www.readbyqxmd.com/read/28819289/escrt-iii-membrane-trafficking-misregulation-contributes-to-fragile-x-syndrome-synaptic-defects
#7
Dominic J Vita, Kendal Broadie
The leading cause of heritable intellectual disability (ID) and autism spectrum disorders (ASD), Fragile X syndrome (FXS), is caused by loss of the mRNA-binding translational suppressor Fragile X Mental Retardation Protein (FMRP). In the Drosophila FXS disease model, we found FMRP binds shrub mRNA (human Chmp4) to repress Shrub expression, causing overexpression during the disease state early-use critical period. The FXS hallmark is synaptic overelaboration causing circuit hyperconnectivity. Testing innervation of a central brain learning/memory center, we found FMRP loss and Shrub overexpression similarly increase connectivity...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819056/effects-of-sublethal-doses-of-thiacloprid-and-its-formulation-calypso-%C3%A2-on-the-learning-and-memory-performance-of-honey-bees
#8
Léa Tison, Sophie Holtz, Amy Adeoye, Önder Kalkan, Nina S Irmisch, Randolf Menzel
Learning and memory play a central role in behavior and communication of foraging bees. We already showed that chronic uptake of the neonicotinoid thiacloprid affects the behavior of honey bees in the field. Foraging behavior, homing success, navigation performance, and social communication were impaired. Thiacloprid collected at a feeding site at low doses accumulates in foragers over time. Here we applied a laboratory standard procedure, the proboscis extension response (PER) conditioning, in order to assess which processes, acquisition, memory consolidation and/or memory retrieval were compromised after bees were fed either with thiacloprid or the formulation of thiacloprid named Calypso(®) at 3 different sublethal doses...
August 17, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28818818/validation-of-a-smartphone-based-approach-to-in-situ-cognitive-fatigue-assessment
#9
Edward Price, George Moore, Leo Galway, Mark Linden
BACKGROUND: Acquired Brain Injuries (ABIs) can result in multiple detrimental cognitive effects, such as reduced memory capability, concentration, and planning. These effects can lead to cognitive fatigue, which can exacerbate the symptoms of ABIs and hinder management and recovery. Assessing cognitive fatigue is difficult due to the largely subjective nature of the condition and existing assessment approaches. Traditional methods of assessment use self-assessment questionnaires delivered in a medical setting, but recent work has attempted to employ more objective cognitive tests as a way of evaluating cognitive fatigue...
August 17, 2017: JMIR MHealth and UHealth
https://www.readbyqxmd.com/read/28818692/suppression-of-irrelevant-sounds-during-auditory-working-memory
#10
Jyrki Ahveninen, Larry J Seidman, Wei-Tang Chang, Matti Hämäläinen, Samantha Huang
Auditory working memory (WM) processing in everyday acoustic environments depends on our ability to maintain relevant information online in our minds, and to suppress interference caused by competing incoming stimuli. A challenge in communication settings is that the relevant content and irrelevant inputs may emanate from a common source, such as a talkative conversationalist. An open question is how the WM system deals with such interference. Will the distracters become inadvertently filtered before processing for meaning because the primary WM operations deplete all available processing resources? Or are they suppressed post perceptually, through an active control process? We tested these alternative hypotheses by measuring magnetoencephalography (MEG), EEG, and functional MRI (fMRI) during a phonetic auditory continuous performance task...
August 14, 2017: NeuroImage
https://www.readbyqxmd.com/read/28818684/t-cell-mediated-rejection-of-human-cd34-cells-is-prevented-by-costimulatory-blockade-in-a-xenograft-model
#11
A L Oh, D Mahmud, B Nicolini, N Mahmud, V Senyuk, P R Patel, E Bonetti, M Arpinati, Jlm Ferrara, D Rondelli
A xenograft model of stem cell rejection was developed by co-transplantating human CD34+ and allogeneic CD3+ T cells into NOD-scid ɣ-chain(null) (NSG) mice. T cells caused graft failure when transplanted at any CD34:CD3 ratio between 1:50 to 1:0.1. Kinetics experiments showed that two weeks after transplantation CD34+ cells engrafted the marrow and T cells expanded in the spleen. Then at four weeks only memory T cells populated both sites and rejected CD34+ cells. Blockade of T cell costimulation was tested by injecting the mice with abatacept (CTLA4-IgG1) from day -1 to +27 (Group A), or from day -1 to +13 (Group B), or from day +14 to +28 (Group C)...
August 14, 2017: Biology of Blood and Marrow Transplantation
https://www.readbyqxmd.com/read/28818500/cryptic-sexual-dimorphism-in-spatial-memory-and-hippocampal-oxytocin-receptors-in-prairie-voles-microtus-ochrogaster
#12
Marissa A Rice, Lauren E Hobbs, Kelly J Wallace, Alexander G Ophir
Sex differences are well documented and are conventionally associated with intense sex-specific selection. For example, spatial memory is frequently better in males, presumably due to males' tendency to navigate large spaces to find mates. Alternatively, monogamy (in which sex-specific selection is relatively relaxed) should diminish or eliminate differences in spatial ability and the mechanisms associated with this behavior. Nevertheless, phenotypic differences between monogamous males and females persist, sometimes cryptically...
August 14, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28816502/cost-of-malingering-mild-traumatic-brain-injury-related-cognitive-deficits-during-compensation-and-pension-evaluations-in-the-veterans-benefits-administration
#13
John H Denning, Robert D Shura
Given the high rates of exaggeration in those claiming long-term cognitive deficits as a result of mild traumatic brain injury (mTBI), the aim of this study was to evaluate the rates of malingering in those seeking disability through the Veterans Benefits Administration and estimate the financial burden of disability payments for those receiving compensation despite exaggerated mTBI-related cognitive deficits. Retrospective review included 74 veterans seen for Compensation and Pension evaluations for mTBI. Rates of malingering were based on failure of the Medical Symptom Validity Test (MSVT) and/or the Test of Memory Malingering (TOMM) trial 1 ≤ 40...
August 17, 2017: Applied Neuropsychology. Adult
https://www.readbyqxmd.com/read/28816476/benefits-of-flexible-prioritization-in-working-memory-can-arise-without-costs
#14
Nicholas E Myers, Sammi R Chekroud, Mark G Stokes, Anna C Nobre
Most recent models conceptualize working memory (WM) as a continuous resource, divided up according to task demands. When an increasing number of items need to be remembered, each item receives a smaller chunk of the memory resource. These models predict that the allocation of attention to high-priority WM items during the retention interval should be a zero-sum game: improvements in remembering cued items come at the expense of uncued items because resources are dynamically transferred from uncued to cued representations...
August 17, 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/28816470/effects-of-postwarning-specificity-on-memory-performance-and-confidence-in-the-eyewitness-misinformation-paradigm
#15
Philip A Higham, Hartmut Blank, Karlos Luna
The influence of postevent misinformation on memory is typically constrained by postwarnings, but little is known about the effectiveness of particular features of postwarnings, such as their specificity. Experiment 1 compared 2 levels of postwarning specificity: A general postwarning just stated the presence of misinformation, whereas a specific postwarning identified the test items for which misinformation had been presented earlier. The specific postwarning, but not the general postwarning, eliminated both the misinformation effect and its deleterious impact on memory monitoring (using a classic 2-alternative forced-choice recognition procedure)...
August 17, 2017: Journal of Experimental Psychology. Applied
https://www.readbyqxmd.com/read/28816239/hippocampal-protein-kinase-c-signaling-mediates-the-short-term-memory-impairment-induced-by-delta9-tetrahydrocannabinol
#16
Arnau Busquets-Garcia, Maria Gomis-González, Victòria Salgado-Mendialdúa, Lorena Galera-López, Emma Puighermanal, Elena Martín-García, Rafael Maldonado, Andrés Ozaita
Cannabis affects cognitive performance through the activation of the endocannabinoid system, and the molecular mechanisms involved in this process are poorly understood. Using the novel object-recognition memory test in mice, we found that the main psychoactive component of cannabis, delta9-tetrahydrocannabinol (THC), alters short-term object-recognition memory specifically involving protein kinase C (PKC)-dependent signaling. Indeed, the systemic or intra-hippocampal pre-treatment with the PKC inhibitors, prevented the short-term, but not the long-term, memory impairment induced by THC...
August 17, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28816008/lactuca-capensis-reverses-memory-deficits-in-a%C3%AE-1-42-induced-an-animal-model-of-alzheimer-s-disease
#17
Paula Alexandra Postu, Jaures A K Noumedem, Oana Cioanca, Monica Hancianu, Marius Mihasan, Mitica Ciorpac, Dragos Lucian Gorgan, Brindusa Alina Petre, Lucian Hritcu
We investigated the neuropharmacological effects of the methanolic extract from Lactuca capensis Thunb. leaves (100 and 200 mg/kg) for 21 days on memory impairment in an Alzheimer's disease (AD) rat model produced by direct intraventricular delivery of amyloid-β1-42 (Aβ1-42). Behavioural assays such as Y-maze and radial arm maze test were used for assessing memory performance. Aβ1-42 decreased cognitive performance in the behavioural tests which were ameliorated by pre-treatment with the methanolic extract...
August 16, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28814979/executive-functioning-in-cornelia-de-lange-syndrome-domain-asynchrony-and-age-related-performance
#18
Donna Reid, Jo Moss, Lisa Nelson, Laura Groves, Chris Oliver
BACKGROUND: The aim of this study was to examine executive functioning in adolescents and adults with Cornelia de Lange syndrome (CdLS) to identify a syndrome and age-related profile of cognitive impairment. METHODS: Participants were 24 individuals with CdLS aged 13-42 years (M = 22; SD = 8.98), and a comparable contrast group of 21 individuals with Down syndrome (DS) aged 15-33 years (M = 24; SD = 5.82). Measures were selected to test verbal and visual fluency, inhibition, perseverance/flexibility, and working memory and comprised both questionnaire and performance tests...
2017: Journal of Neurodevelopmental Disorders
https://www.readbyqxmd.com/read/28814961/compound-schisandra-ginseng-notoginseng-lycium-extract-ameliorates-scopolamine-induced-learning-and-memory-disorders-in-mice
#19
Ning Li, Cong Liu, Shu Jing, Mengyang Wang, Han Wang, Jinghui Sun, Chunmei Wang, Jianguang Chen, He Li
Schisandra, Ginseng, Notoginseng, and Lycium barbarum are traditional Chinese medicinal plants sharing cognitive-enhancing properties. To design a functional food to improve memory, we prepared a compound Schisandra-Ginseng-Notoginseng-Lycium (CSGNL) extract and investigated its effect on scopolamine-induced learning and memory loss in mice. To optimize the dose ratios of the four herbal extracts in CSGNL, orthogonal experiments were performed. Mice were administered CSGNL by gavage once a day for 30 days and then mouse learning and memory were evaluated by Morris water maze and step-through tests...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28814843/effects-of-hearing-loss-on-speech-recognition-under-distracting-conditions-and-working-memory-in-the-elderly
#20
Wondo Na, Gibbeum Kim, Gungu Kim, Woojae Han, Jinsook Kim
PURPOSE: The current study aimed to evaluate hearing-related changes in terms of speech-in-noise processing, fast-rate speech processing, and working memory; and to identify which of these three factors is significantly affected by age-related hearing loss. METHODS: One hundred subjects aged 65-84 years participated in the study. They were classified into four groups ranging from normal hearing to moderate-to-severe hearing loss. All the participants were tested for speech perception in quiet and noisy conditions and for speech perception with time alteration in quiet conditions...
2017: Clinical Interventions in Aging
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