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https://www.readbyqxmd.com/read/29775673/gender-dependent-contribution-of-muscarinic-receptors-in-memory-retrieval-under-sub-chronic-stress
#1
Habiba Rashid, Touqeer Ahmed
Stress induces retrograde amnesia in humans and rodents. Muscarinic antagonism under normal physiological conditions causes gender dependent impairment in episodic memory retrieval. We aimed to explore the gender dependent role of muscarinic receptors in memory retrieval under sub-chronic stress condition. Male and female mice were trained for Morris water maze test and contextual fear conditioning, followed by 3 hour restraint stress per day for five days. Stress was either given alone or in combination with a daily subcutaneous injection of scopolamine (1 mg/kg) or donepezil (1 mg/kg)...
May 15, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29772518/brain-state-before-a-memory-probe-and-associative-retrieval-in-older-adults
#2
Jiangyi Xia, Giulia Galli, Leun J Otten
Older individuals' difficulty in remembering events from a particular time and place may be explained by changes in retrieval-related control processes. We investigated how aging affects neural activity leading up to a retrieval probe and how such activity relates to later performance. Electrical brain activity was recorded while healthy younger and older humans memorized visual word pairs consisting of an object word (e.g., doll) preceded by a location word (e.g., garden). Only object words were presented during the memory test, the task being to decide whether an object had been presented earlier and, if so, what location had been paired with it...
April 12, 2018: Neurobiology of Aging
https://www.readbyqxmd.com/read/29765663/categorizing-experience-based-foraging-plasticity-in-mites-age-dependency-primacy-effects-and-memory-persistence
#3
Peter Schausberger, Undarmaa Davaasambuu, Stéphanie Saussure, Inga C Christiansen
Behavioural plasticity can be categorized into activational (also termed contextual) and developmental plasticity. Activational plasticity allows immediate contextual behavioural changes, whereas developmental plasticity is characterized by time-lagged changes based on memory of previous experiences (learning). Behavioural plasticity tends to decline with age but whether this holds true for both plasticity categories and the effects of first-in-life experiences is poorly understood. We tackled this issue by assessing the foraging plasticity of plant-inhabiting predatory mites, Amblyseius swirskii , on thrips and spider mites following age-dependent prey experience, i...
April 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/29756806/aging-and-the-strategic-use-of-context-to-control-prospective-memory-monitoring
#4
B Hunter Ball, Julie M Bugg
Monitoring the environment for the occurrence of prospective memory (PM) targets is a resource-demanding process that produces cost to ongoing activities. The current study investigated younger and older adults' ability to monitor strategically, which involves the heightening and relaxation of monitoring when it is contextually appropriate thereby affording conservation of limited-capacity attentional resources. Participants performed a lexical-decision task in which words or nonwords were presented in upper or lower locations of the screen...
May 2018: Psychology and Aging
https://www.readbyqxmd.com/read/29752958/an-update-on-contextual-fear-memory-mechanisms-transition-between-amygdala-and-hippocampus
#5
REVIEW
Nicholas Chaaya, Andrew R Battle, Luke R Johnson
Context is an ever-present combination of discrete environmental elements capable of influencing many psychological processes. When context is associated with an aversive stimulus, a permanent contextual fear memory is formed. Context is hypothesized to greatly influence the treatability of various fear-based pathologies, in particular, post-traumatic stress disorder (PTSD). In order to understand how contextual fear memories are encoded and impact underlying fear pathology, delineation of the underlying neural circuitry of contextual fear memory consolidation and maintenance is essential...
May 9, 2018: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/29750975/nicotine-increases-fear-responses-and-brain-acetylcholinesterase-activity-in-a-context-dependent-manner-in-zebrafish
#6
Paola R Ziani, Talise E Müller, Flavia V Stefanello, Barbara D Fontana, Tâmie Duarte, Julia Canzian, Denis B Rosemberg
Nicotine is an alkaloid with positive effects on learning and memory processes. Exposure to conspecific alarm substance (CAS) elicits fear responses in zebrafish, but the effects of nicotine on aversive behaviors and associative learning in this species remain unclear. Here, we evaluated whether nicotine enhances contextual fear responses in zebrafish and investigated a putative involvement of brain acetylcholinesterase (AChE) in associative learning. Fish were exposed to 1 mg/L nicotine for 3 min and then kept in non-chlorinated water for 20 min...
May 8, 2018: Pharmacology, Biochemistry, and Behavior
https://www.readbyqxmd.com/read/29747244/nucleus-reuniens-of-the-thalamus-controls-fear-memory-intensity-specificity-and-long-term-maintenance-during-consolidation
#7
Fernanda Troyner, Maira A Bicca, Leandro J Bertoglio
The thalamic nucleus reuniens (NR) has been shown to support bidirectional medial prefrontal cortex-hippocampus communication and synchronization relevant for cognitive processing. Using non-selective or prolonged inactivation of the NR, previous studies reported its activity positively modulates aversive memory consolidation. Here we examined the NR's role in consolidating contextual fear memories with varied strength, at both recent and more remote time points, using muscimol-induced temporary inactivation in rats...
May 10, 2018: Hippocampus
https://www.readbyqxmd.com/read/29745430/working-memory-dependence-of-spatial-contextual-cueing-for-visual-search
#8
Stefan Pollmann
When spatial stimulus configurations repeat in visual search, a search facilitation, resulting in shorter search times, can be observed that is due to incidental learning. This contextual cueing effect appears to be rather implicit, uncorrelated with observers' explicit memory of display configurations. Nevertheless, as I review here, this search facilitation due to contextual cueing depends on visuospatial working memory resources, and it disappears when visuospatial working memory is loaded by a concurrent delayed match to sample task...
May 10, 2018: British Journal of Psychology
https://www.readbyqxmd.com/read/29740084/periodical-reactivation-under-the-effect-of-caffeine-attenuates-fear-memory-expression-in-rats
#9
Lizeth K Pedraza, Rodrigo O Sierra, Fernanda N Lotz, Lucas de Oliveira Alvares
In the last decade, several studies have shown that fear memories can be attenuated by interfering with reconsolidation. However, most of the pharmacological agents used in preclinical studies cannot be administered to humans. Caffeine is one of the world's most popular psychoactive drugs and its effects on cognitive and mood states are well documented. Nevertheless, the influence of caffeine administration on fear memory processing is not as clear. We employed contextual fear conditioning in rats and acute caffeine administration under a standard memory reconsolidation protocol or periodical memory reactivation...
May 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29728647/opiate-associated-contextual-memory-formation-and-retrieval-are-differentially-modulated-by-dopamine-d1-and-d2-signaling-in-hippocampal-prefrontal-connectivity
#10
Yunpeng Wang, Hongying Zhang, Jingjing Cui, Jing Zhang, Fangyuan Yin, Hao Guo, Jianghua Lai, Bo Xing
Contextual memory driven by abused drugs such as opiates has a central role in maintenance and relapse of drug-taking behaviors. Although dopamine (DA) signaling favors memory storage and retrieval via regulation of hippocampal-prefrontal connectivity, its role in modulating opiate-associated contextual memory is largely unknown. Here, we report roles of DA signaling within the hippocampal-prefrontal circuit for opiate-related memories. Combining-conditioned place preference (CPP) with molecular analyses, we investigated the DA D1 receptor (D1R) and extracellular signal-regulated kinase (ERK)-cAMP-response element binding protein (CREB) signaling, as well as DA D2 receptor (D2R) and protein kinase B (PKB or Akt)/glycogen synthase kinase 3 (GSK3) signaling in the ventral hippocampus (vHip) and medial prefrontal cortex (mPFC) during the formation of opiate-related associative memories...
April 17, 2018: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29726811/correction-the-ampa-receptor-associated-protein-shisa7-regulates-hippocampal-synaptic-function-and-contextual-memory
#11
Leanne J M Schmitz, Remco V Klaassen, Marta Ruiperez-Alonso, Azra Elia Zamri, Jasper Stroeder, Priyanka Rao-Ruiz, Johannes C Lodder, Rolinka J van der Loo, Huib D Mansvelder, August B Smit, Sabine Spijker
No abstract text is available yet for this article.
May 4, 2018: ELife
https://www.readbyqxmd.com/read/29725029/sex-differences-in-hippocampal-memory-and-kynurenic-acid-formation-following-acute-sleep-deprivation-in-rats
#12
Annalisa M Baratta, Silas A Buck, Austin D Buchla, Carly B Fabian, Shuo Chen, Jessica A Mong, Ana Pocivavsek
Inadequate sleep is a prevalent problem within our society that can result in cognitive dysfunction. Elevations in kynurenic acid (KYNA), a metabolite of the kynurenine pathway (KP) of tryptophan degradation known to impact cognition, in the brain may constitute a molecular link between sleep loss and cognitive impairment. To test this hypothesis, we investigated the impact of 6 hours of sleep deprivation on memory and KP metabolism (brain and plasma) in male and female rats. Sleep-deprived males were impaired in a contextual memory paradigm, and both sexes were impaired in a recognition memory paradigm...
May 3, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29724641/identifying-patterns-of-motor-performance-executive-functioning-and-verbal-ability-in-preschool-children-a-latent-profile-analysis
#13
Suzanne Houwen, Erica Kamphorst, Gerda van der Veer, Marja Cantell
BACKGROUND: A relationship between motor performance and cognitive functioning is increasingly being recognized. Yet, little is known about the precise nature of the relationship between both domains, especially in early childhood. AIMS: To identify distinct constellations of motor performance, executive functioning (EF), and verbal ability in preschool aged children; and to explore how individual and contextual variables are related to profile membership. METHODS AND PROCEDURES: The sample consisted of 119 3- to 4-year old children (62 boys; 52%)...
April 30, 2018: Research in Developmental Disabilities
https://www.readbyqxmd.com/read/29717980/5-ht2a-receptor-in-mpfc-influences-context-guided-reconsolidation-of-object-memory-in-perirhinal-cortex
#14
Juan Facundo Morici, Magdalena Miranda, Francisco Tomás Gallo, Belén Zanoni, Pedro Bekinschtein, Noelia V Weisstaub
Context-dependent memories may guide adaptive behavior relaying in previous experience while updating stored information through reconsolidation. Retrieval can be triggered by partial and shared cues. When the cue is presented, the most relevant memory should be updated. In a contextual version of the object recognition task, we examined the effect of medial PFC (mPFC) serotonin 2a receptor (5-HT2aR) blockade during retrieval in reconsolidation of competing objects memories. We found that mPFC 5-HT2aR controls retrieval and reconsolidation of object memories in the perirhinal cortex (PRH), but not in the dorsal hippocampus in rats...
May 2, 2018: ELife
https://www.readbyqxmd.com/read/29714053/sulforaphane-upregulates-the-heat-shock-protein-co-chaperone-chip-and-clears-amyloid-%C3%AE-and-tau-in-a-mouse-model-of-alzheimer-s-disease
#15
Siyoung Lee, Bo-Ryoung Choi, Jisung Kim, Frank M LaFerla, Jung Han Yoon Park, Jung-Soo Han, Ki Won Lee, Jiyoung Kim
SCOPE: Sulforaphane is an herbal isothiocyanate enriched in cruciferous vegetables. Here, we investigated whether sulforaphane modulates the production of amyloid-β (Aβ) and tau, the two main pathological factors in Alzheimer's disease (AD). METHODS AND RESULTS: A triple transgenic mouse model of AD (3 × Tg-AD) was used to study the effect of sulforaphane. Oral gavage of sulforaphane reduced protein levels of monomeric and polymeric forms of Aβ as well as tau and phosphorylated tau in 3 × Tg-AD mice...
April 30, 2018: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/29714026/when-and-where-in-aging-the-role-of-music-on-source-monitoring
#16
Rocco Palumbo, Nicola Mammarella, Alberto Di Domenico, Beth Fairfield
Difficulties in source monitoring (SM) tasks observed in healthy older adults may be linked to associative memory deficits since SM requires individuals to correctly bind and later remember these bound features to discriminate the origin of a memory. Therefore, focusing attention on discriminating factors that may attenuate older adults' difficulties in attributing contextual information to memories is necessary. We investigated the effect of affective information on source monitoring in younger and older adults by manipulating the type of affective information (pictures and music) and assessing the ability to remember spatial and temporal source details for affective pictures encoded while listening to classical music...
April 30, 2018: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/29712785/remote-memory-and-cortical-synaptic-plasticity-require-neuronal-ccctc-binding-factor-ctcf
#17
Somi Kim, Nam-Kyung Yu, Kyu-Won Shim, Ji-Il Kim, Hyopil Kim, Dae Hee Han, Ja Eun Choi, Seung-Woo Lee, Dong Il Choi, Myung Won Kim, Dong-Sung Lee, Kyungmin Lee, Niels Galjart, Yong-Seok Lee, Jae-Hyung Lee, Bong-Kiun Kaang
The molecular mechanism of long-term memory has been extensively studied in the context of the hippocampus-dependent recent memory examined within several days. However, months-old remote memory maintained in the cortex for long-term has not been investigated much at the molecular level yet. Various epigenetic mechanisms are known to be important for long-term memory, but how the three-dimensional (3D) chromatin architecture and its regulator molecules contribute to neuronal plasticity and systems consolidation are still largely unknown...
April 30, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29705603/hypobaric-hypoxia-impairs-cued-and-contextual-fear-memory-in-rats
#18
Punita Kumari, Hina Kauser, Meetu Wadhwa, Koustav Roy, Shahnawaz Alam, Surajit Sahu, Krishna Kishore, Koushik Ray, Usha Panjwani
Fear memory is essential for survival, and its dysregulation leads to disorders. High altitude hypobaric hypoxia (HH) is known to induce cognitive decline. However, its effect on fear memory is still an enigma. We aimed to investigate the temporal effect of HH on fear conditioning and the underlying mechanism. Adult male Sprague-Dawley rats were trained for fear conditioning and exposed to simulated HH equivalent to 25,000 ft for different durations (1, 3, 7, 14 and 21 days). Subsequently, rats were tested for cued and contextual fear conditioning...
April 26, 2018: Brain Research
https://www.readbyqxmd.com/read/29705066/manipulating-memory-efficacy-affects-the-behavioral-and-neural-profiles-of-deterministic-learning-and-decision-making
#19
Joshua J Tremel, Daniella M Ortiz, Julie A Fiez
When making a decision, we have to identify, collect, and evaluate relevant bits of information to ensure an optimal outcome. How we approach a given choice can be influenced by prior experience. Contextual factors and structural elements of these past decisions can cause a shift in how information is encoded and can in turn influence later decision-making. In this two-experiment study, we sought to manipulate declarative memory efficacy and decision-making in a concurrent discrimination learning task by altering the amount of information to be learned...
April 26, 2018: Neuropsychologia
https://www.readbyqxmd.com/read/29704907/illness-perceptions-predict-cognitive-performance-validity
#20
George K Henry, Robert L Heilbronner, Julie Suhr, Jeffrey Gornbein, Eveleigh Wagner, Daniel L Drane
OBJECTIVES: The aim of this study was to investigate the relationship of psychological variables to cognitive performance validity test (PVT) results in mixed forensic and nonforensic clinical samples. METHODS: Participants included 183 adults who underwent comprehensive neuropsychological examination. Criterion groups were formed, that is, Credible Group or Noncredible Group, based upon their performance on the Word Memory Test and other stand-alone and embedded PVT measures...
April 29, 2018: Journal of the International Neuropsychological Society: JINS
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