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Spatial memory

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https://www.readbyqxmd.com/read/29030082/adx-47273-a-mglu5-receptor-positive-allosteric-modulator-attenuates-deficits-in-cognitive-flexibility-induced-by-withdrawal-from-binge-like-ethanol-exposure-in-rats
#1
Marta Marszalek-Grabska, Ewa Gibula-Bruzda, Anna Bodzon-Kulakowska, Piotr Suder, Kinga Gawel, Sylwia Talarek, Joanna Listos, Ewa Kędzierska, Wojciech Danysz, Jolanta H Kotlinska
Repeated exposure to and withdrawal from ethanol induces deficits in spatial reversal learning. Data indicate that metabotropic glutamate 5 (mGlu5) receptors are implicated in synaptic plasticity and learning and memory. These receptors functionally interact with N-methyl-d-aspartate (NMDA) receptors, and activation of one type results in the activation of the other. We examined whether (S)-(4-fluorophenyl)(3-(3-(4-fluorophenyl)-1,2,4-oxadiazol-5-yl)-piperidin-1-yl (ADX-47273), a positive allosteric modulator (PAM) of mGlu5 receptor, attenuates deficits in reversal learning induced by withdrawal (11-13days) from 'binge-like' ethanol input (5...
October 10, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/29028440/intracerebroventricular-infusion-of-an-angiotensin-at2-receptor-agonist-novokinin-aggravates-some-diabetes-mellitus-induced-alterations-in-wistar-rats
#2
Daniela Pechlivanova, Kiril Petrov, Petar Grozdanov, Zlatina Nenchovska, Jana Tchekalarova, Alexander Stoynev
Cumulative data suggest the significant role of the Renin - Angiotensin System in the development of the pathological consequences of diabetes mellitus (DM). Newly synthesized AT2 receptor agonists gained importance as a target for creating new antihypertensives. The aim of the present work was to study the effects of a peptide AT2 agonist Novokinin, infused intracerebroventricularly, on the consequences of the streptozotocin-induced type 1 DM (T1 DM) in Wistar rats. Food and water consumption, body weight, urine excretion (metabolic cages), motor activity (open field test), anxiety (elevated plus maze), nociception (paw pressure analgesimeter test), spatial memory (T-maze alternation test) and plasma levels of glucose and corticosterone (ELISA) were assessed two weeks after the T1 DM induction...
October 13, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/29028156/genetic-background-effects-in-neuroligin-3-mutant-mice-minimal-behavioral-abnormalities-on-c57-background
#3
Thomas C Jaramillo, Christine Ochoa Escamilla, Shunan Liu, Lauren Peca, Shari G Birnbaum, Craig M Powell
Neuroligin-3 (NLGN3) is a postsynaptic cell adhesion protein that interacts with presynaptic ligands including neurexin-1 (NRXN1) [Ichtchenko et al., Journal of Biological Chemistry, 271, 2676-2682, 1996]. Mice harboring a mutation in the NLGN3 gene (NL3R451C) mimicking a mutation found in two brothers with autism spectrum disorder (ASD) were previously generated and behaviorally phenotyped for autism-related behaviors. In these NL3R451C mice generated and tested on a hybrid C57BL6J/129S2/SvPasCrl background, we observed enhanced spatial memory and reduced social interaction [Tabuchi et al...
October 13, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/29028135/predicting-episodic-and-spatial-memory-performance-from-hippocampal-resting-state-functional-connectivity-evidence-for-an-anterior-posterior-division-of-function
#4
Jonas Persson, Eva Stening, Kristin Nordin, Hedvig Söderlund
fMRI studies have identified distinct resting-state functional connectivity (RSFC) networks associated with the anterior and posterior hippocampus. However, the functional relevance of these two networks is still largely unknown. Hippocampal lesion studies and task-related fMRI point to a role for the anterior hippocampus in non-spatial episodic memory and the posterior hippocampus in spatial memory. We used Relevance Vector Regression (RVR), a machine-learning method that enables predictions of continuous outcome measures from multivariate patterns of brain imaging data, to test the hypothesis that patterns of whole-brain RSFC associated with the anterior hippocampus predict episodic memory performance, while patterns of whole-brain RSFC associated with the posterior hippocampus predict spatial memory performance...
October 13, 2017: Hippocampus
https://www.readbyqxmd.com/read/29027240/low-dose-ct-reconstruction-using-spatially-encoded-nonlocal-penalty
#5
Kyungsang Kim, Georges El Fakhri, Quanzheng Li
PURPOSE: Computed tomography (CT) is one of the most used imaging modalities for imaging both symptomatic and asymptomatic patients. However, because of the high demand for lower radiation dose during CT scans, the reconstructed image can suffer from noise and artifacts due to the trade-off between the image quality and the radiation dose. The purpose of this paper is to improve the image quality of quarter dose images and to select the best hyperparameters using the regular dose image as ground truth...
October 2017: Medical Physics
https://www.readbyqxmd.com/read/29024752/overtraining-modifies-spatial-memory-susceptibility-to-corticosterone-administration
#6
Alejandro Múnera, Mayerli A Prado-Rivera, D Carolina Cárdenas-Poveda, Marisol R Lamprea
Even though the effects of overtraining and glucocorticoids on different phases of spatial memory are known, the interaction between these factors on the retrieval and extinction of spatial memory has not yet been described. Adult male Wistar rats received eight training trials per day in the Barnes maze for either one or two days. Twenty-four hours after the last training trial they were randomly assigned for receiving an intraperitoneal vehicle or corticosterone injection (0.125 or 0.5 mg/kg) and ten minutes later they were given a memory test, followed by seven extinction trials...
October 9, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/29022728/stereo-viewing-modulates-three-dimensional-shape-processing-during-object-recognition-a-high-density-erp-study
#7
Zoe J Oliver, Filipe Cristino, Mark V Roberts, Alan J Pegna, E Charles Leek
The role of stereo disparity in the recognition of 3-dimensional (3D) object shape remains an unresolved issue for theoretical models of the human visual system. We examined this issue using high-density (128 channel) recordings of event-related potentials (ERPs). A recognition memory task was used in which observers were trained to recognize a subset of complex, multipart, 3D novel objects under conditions of either (bi-) monocular or stereo viewing. In a subsequent test phase they discriminated previously trained targets from untrained distractor objects that shared either local parts, 3D spatial configuration, or neither dimension, across both previously seen and novel viewpoints...
October 12, 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/29019445/the-beneficial-effect-of-contextual-emotion-on-memory-the-role-of-integration
#8
Anthony Macri, Amélie Pavard, Rémy Versace
This study investigates the effects of emotion on the integration mechanism which binds together the components of an event and the relations between these components and encodes them within a memory trace [Versace, R., Vallet, G. T., Riou, B., Lesourd, M., Labeye, É, & Brunel, L. (2014). Act-In: An integrated view of memory mechanisms. Journal of Cognitive Psychology, 26(3), 280-306. doi: 10.1080/20445911.2014.892113 ]. Based on the literature, the authors argue that, in a memory task, contextual emotion could strengthen the integration mechanism and, more specifically, the relations between a target item and its contextual features...
October 11, 2017: Cognition & Emotion
https://www.readbyqxmd.com/read/29018405/chimeric-peptide-tat-ha-nr2b9c-improves-regenerative-repair-after-transient-global-ischemia
#9
Hai-Hui Zhou, Li Zhang, Hai-Xia Zhang, Jin-Ping Zhang, Wei-Hong Ge
Transient global ischemia (TGI) is a major public health problem, and it heightens the need of effective treatments. The present study was undertaken to investigate whether recombinant polypeptide Tat-HA-NR2B9c improves spatial learning and memory deficits in rats after TGI. Rats were subjected to 20-min ischemia induced by four-vessel occlusion (4-VO) method and daily injected with Tat-HA-NR2B9c (1.12 mg/kg) for 1 week. Tat-HA-NR2B9c increased CREB activity, upregulated B-cell lymphoma-2 (Bcl-2) expression after treated for 24 h...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/29018340/impaired-spatial-memory-and-enhanced-habit-memory-in-a-rat-model-of-post-traumatic-stress-disorder
#10
Jarid Goodman, Christa K McIntyre
High levels of emotional arousal can impair spatial memory mediated by the hippocampus, and enhance stimulus-response (S-R) habit memory mediated by the dorsolateral striatum (DLS). The present study was conducted to determine whether these memory systems may be similarly affected in an animal model of post-traumatic stress disorder (PTSD). Sprague-Dawley rats were subjected to a "single-prolonged stress" (SPS) procedure and 1 week later received training in one of two distinct versions of the plus-maze: a hippocampus-dependent place learning task or a DLS-dependent response learning task...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29016818/posterior-fossa-syndrome-and-long-term-neuropsychological-outcomes-among-children-treated-for-medulloblastoma-on-a-multi-institutional-prospective-study
#11
Jane E Schreiber, Shawna L Palmer, Heather M Conklin, Donald J Mabbott, Michelle A Swain, Melanie J Bonner, Mary L Chapieski, Lu Huang, Hui Zhang, Amar Gajjar
Background: Patients treated for medulloblastoma who experience posterior fossa syndrome (PFS) demonstrate increased risk for neurocognitive impairment at one year post diagnosis. The aim of the study was to examine longitudinal trajectories of neuropsychological outcomes in patients who experienced PFS compared with patients who did not. Methods: Participants were 36 patients (22 males) who experienced PFS and 36 comparison patients (21 males) who were matched on age at diagnosis and treatment exposure but did not experience PFS...
July 19, 2017: Neuro-oncology
https://www.readbyqxmd.com/read/28993860/lanthanum-damages-learning-and-memory-and-suppresses-astrocyte-neuron-lactate-shuttle-in-rat-hippocampus
#12
Cuihong Jin, Liang Gao, Yingqi Li, Shengwen Wu, Xiaobo Lu, Jinghua Yang, Yuan Cai
Rare-earth elements (REEs) are applied in various fields by virtue of their superior physical and chemical properties. Surveys have reported that REEs can impair learning and memory in children and induce neurobehavioral abnormalities in animals. However, the mechanism underlying this neurotoxicity is still unclear. Lanthanum (La) is often chosen to study the effects of REEs. Here, we investigated the role of astrocyte-neuron lactate shuttle (ANLS) in spatial learning and memory impairment induced by LaCl3 in hippocampus, an important spatial memory-related brain region...
October 9, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28993643/a-sexually-dimorphic-pre-stressed-translational-signature-in-ca3-pyramidal-neurons-of-bdnf-val66met-mice
#13
Jordan Marrocco, Gordon H Petty, Mariel B Ríos, Jason D Gray, Joshua F Kogan, Elizabeth M Waters, Eric F Schmidt, Francis S Lee, Bruce S McEwen
Males and females use distinct brain circuits to cope with similar challenges. Using RNA sequencing of ribosome-bound mRNA from hippocampal CA3 neurons, we found remarkable sex differences and discovered that female mice displayed greater gene expression activation after acute stress than males. Stress-sensitive BDNF Val66Met mice of both sexes show a pre-stressed translational phenotype in which the same genes that are activated without applied stress are also induced in wild-type mice by an acute stressor...
October 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28993208/intestinal-microbiota-impact-sepsis-associated-encephalopathy-via-the-vagus-nerve
#14
Suyan Li, Jian Lv, Jianguo Li, Zhaolong Zhao, Hui Guo, Yanni Zhang, Shichao Cheng, Jianbin Sun, Hongming Pan, Shaopeng Fan, Zhongxin Li
OBJECTIVE: The pathogenesis of sepsis associated encephalopathy (SAE) remains poorly understood. Vagus nerve plays an important role in gut-microbiota-brain axis. This study aimed to investigate whether vague nerve is a key mediator of the impact of intestinal microbiota on SAE. METHODS: Male rats were randomly divided into four groups (n=20): SHAM (SH) group, lipopolysaccharide (LPS) group, fecal microbiota transplantation (FMT) +LPS group, and vagotomy (VGX)+LPS+FMT group...
October 6, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28993113/the-cognitive-impact-of-chronic-low-back-pain-positive-effect-of-multidisciplinary-pain-therapy
#15
Marcus Schiltenwolf, Michael Akbar, Eva Neubauer, Simone Gantz, Herta Flor, Andreas Hug, Haili Wang
OBJECTIVES: Little is known about the affected cognitive problems in chronic low back pain patients. For this patient cohort research mostly focused on memory of pain, rather than cognitive difficulties related to pain. Chronic pain may be associated with specific (yet undefined) cognitive deficits that affect everyday behaviour. We set out to compare the cognitive function of patients with chronic low back pain (cLBP) in the course of multidisciplinary pain treatments before and after therapy...
October 6, 2017: Scandinavian Journal of Pain
https://www.readbyqxmd.com/read/28992229/meta-analysis-of-cognitive-functioning-in-patients-following-kidney-transplantation
#16
Paras Joshee, Amanda G Wood, Eleri R Wood, Elizabeth A Grunfeld
Background: There is mixed evidence regarding the nature of cognitive function in patients who have undergone renal transplantation. The aim of this meta-analysis was to examine which cognitive domains are impacted following kidney transplantation and how performance compares with non-transplanted patients or healthy controls/normative data. Method: A systematic search was conducted using keywords within three databases (Embase, MEDLINE and PsychINFO), yielding 458 unique studies, 10 of which met the inclusion criteria...
September 7, 2017: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/28992036/associations-between-sedentary-behaviours-and-cognitive-function-cross-sectional-and-prospective-findings-from-the-uk-biobank
#17
Kishan Bakrania, Charlotte L Edwardson, Kamlesh Khunti, Stephan Bandelow, Melanie J Davies, Thomas Yates
We investigate the cross-sectional and prospective associations between different sedentary behaviours and cognitive function in a large sample of UK Biobank adults. Baseline data were available on 502,643 participants (years 2006-2010). Cognitive tests included prospective memory [n = 171,585 (baseline only)], visual-spatial memory [round 1 (n = 483,832); round 2 (n = 482,762)], fluid intelligence [n = 165,492], and short-term numeric memory [n = 50,370]. After a mean period of 5.3-years, between 12,091 and 114,373 participants also provided follow-up cognitive data...
July 13, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28991751/unified-deep-learning-architecture-for-modeling-biology-sequence
#18
Hongjie Wu, Chengyuan Cao, Xiaoyan Xia, Qiang Lu
Prediction of the spatial structure or function of biological macromolecules based on their sequence remains an important challenge in bioinformatics. When modeling biological sequences using traditional sequencing models, characteristics, such as long-range interactions between basic units, the complicated and variable output of labeled structures, and the variable length of biological sequences, usually lead to different solutions on a case-by-case basis. This study proposed the use of bidirectional recurrent neural networks based on long short-term memory or a gated recurrent unit to capture long-range interactions by designing the optional reshape operator to adapt to the diversity of the output labels and implementing a training algorithm to support the training of sequence models capable of processing variable-length sequences...
October 9, 2017: IEEE/ACM Transactions on Computational Biology and Bioinformatics
https://www.readbyqxmd.com/read/28989788/caching-for-where-and-what-evidence-for-a-mnemonic-strategy-in-a-scatter-hoarder
#19
Mikel M Delgado, Lucia F Jacobs
Scatter-hoarding animals face the task of maximizing retrieval of their scattered food caches while minimizing loss to pilferers. This demand should select for mnemonics, such as chunking, i.e. a hierarchical cognitive representation that is known to improve recall. Spatial chunking, where caches with the same type of content are related to each other in physical location and memory, would be one such mechanism. Here we tested the hypothesis that scatter-hoarding eastern fox squirrels (Sciurus niger) are organizing their caches in spatial patterns consistent with a chunking strategy...
September 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28989754/accelerating-adaptive-inverse-distance-weighting-interpolation-algorithm-on-a-graphics-processing-unit
#20
Gang Mei, Liangliang Xu, Nengxiong Xu
This paper focuses on designing and implementing parallel adaptive inverse distance weighting (AIDW) interpolation algorithms by using the graphics processing unit (GPU). The AIDW is an improved version of the standard IDW, which can adaptively determine the power parameter according to the data points' spatial distribution pattern and achieve more accurate predictions than those predicted by IDW. In this paper, we first present two versions of the GPU-accelerated AIDW, i.e. the naive version without profiting from the shared memory and the tiled version taking advantage of the shared memory...
September 2017: Royal Society Open Science
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