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https://www.readbyqxmd.com/read/27897674/dopamine-alters-the-fidelity-of-working-memory-representations-according-to-attentional-demands
#1
Sean James Fallon, Nahid Zokaei, Agnes Norbury, Sanjay G Manohar, Masud Husain
Capacity limitations in working memory (WM) necessitate the need to effectively control its contents. Here, we examined the effect of cabergoline, a dopamine D2 receptor agonist, on WM using a continuous report paradigm that allowed us to assess the fidelity with which items are stored. We assessed recall performance under three different gating conditions: remembering only one item, being cued to remember one target among distractors, and having to remember all items. Cabergoline had differential effects on recall performance according to whether distractors had to be ignored and whether mnemonic resources could be deployed exclusively to the target...
November 29, 2016: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/27896633/adverse-orienting-effects-on-visual-working-memory-encoding-and-maintenance
#2
Benchi Wang, Chuyao Yan, Zhiguo Wang, Christian N L Olivers, Jan Theeuwes
Visual working memory (VWM) representations can be strengthened by pre-cues presented before, and retro-cues presented after, the memory display, providing evidence that attentional orienting plays a role in memory encoding and maintenance. It is unknown whether attentional orienting to VWM stimuli can also have adverse effects (known as inhibition of return; IOR), as has been found for perceptual-cueing tasks. If so, this would provide further evidence for common attentional orienting mechanisms for mnemonic and perceptual representations...
November 28, 2016: Psychonomic Bulletin & Review
https://www.readbyqxmd.com/read/27895551/oct4-methylation-mediated-silencing-as-an-epigenetic-barrier-preventing-m%C3%A3-ller-glia-dedifferentiation-in-a-murine-model-of-retinal-injury
#3
Luis I Reyes-Aguirre, Monica Lamas
Müller glia (MG) is the most abundant glial type in the vertebrate retina. Among its many functions, it is capable of responding to injury by dedifferentiating, proliferating, and differentiating into every cell types lost to damage. This regenerative ability is notoriously absent in mammals. We have previously reported that cultured mammalian MG undergoes a partial dedifferentiation, but fails to fully acquire a progenitor phenotype and differentiate into neurons. This might be explained by a mnemonic mechanism comprised by epigenetic traits, such as DNA methylation...
2016: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/27881856/stress-glucocorticoids-and-memory-implications-for-treating-fear-related-disorders
#4
Dominique de Quervain, Lars Schwabe, Benno Roozendaal
Glucocorticoid stress hormones are crucially involved in modulating mnemonic processing of emotionally arousing experiences. They enhance the consolidation of new memories, including those that extinguish older memories, but impair the retrieval of information stored in long-term memory. As strong aversive memories lie at the core of several fear-related disorders, including post-traumatic stress disorder and phobias, the memory-modulating properties of glucocorticoids have recently become of considerable translational interest...
November 24, 2016: Nature Reviews. Neuroscience
https://www.readbyqxmd.com/read/27881596/combined-iron-deficiency-and-low-aerobic-fitness-doubly-burden-academic-performance-among-women-attending-university
#5
Samuel P Scott, Mary Jane De Souza, Karsten Koehler, Laura E Murray-Kolb
BACKGROUND: Academic success is a key determinant of future prospects for students. Cognitive functioning has been related to nutritional and physical factors. Here, we focus on iron status and aerobic fitness in young-adult female students given the high rate of iron deficiency and declines in fitness reported in this population. OBJECTIVES: We sought to explore the combined effects of iron status and fitness on academic success and to determine whether these associations are mediated by cognitive performance...
November 23, 2016: Journal of Nutrition
https://www.readbyqxmd.com/read/27866776/activation-of-%C3%AE-7-nicotinic-acetylcholine-receptors-facilitates-long-term-potentiation-at-the-hippocampal-prefrontal-cortex-synapses-in-vivo
#6
Milan Stoiljkovic, Craig Kelley, Dávid Nagy, Raymond Hurst, Mihály Hajós
Activation of α7 nAChRs has been shown to improve performance in a variety of nonclinical assays of cognitive function. The role of α7 nAChRs in cognitive processes is likely related to their role in modulating synaptic transmission and plasticity that have been reported in cell culture, brain slices, and intact animals. Here we report the effects of the α7 nAChR agonist FRM-17874 on synaptic plasticity within the hippocampal-medial prefrontal cortex pathway. Long-term potentiation (LTP) was generated by tetanic stimulation of CA1/subiculum region in urethane anesthetized male rats...
November 17, 2016: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27864566/using-practice-based-evidence-to-improve-supportive-care-practices-to-reduce-central-line-associated-bloodstream-infections-in-a-pediatric-oncology-unit
#7
Lauri A Linder, Cheryl Gerdy, Rouett Abouzelof, Andrew Wilson
Children with cancer are a subset of patients with central lines with distinct risk factors for infection including periods of prolonged neutropenia and compromised mucous membrane integrity. This article relates the implementation of principles of practice-based evidence to identify interventions in addition to best practice maintenance care bundles to reduce central line-associated bloodstream infections involving viridans group streptococci and coagulase-negative staphylococci on an inpatient pediatric oncology unit...
November 18, 2016: Journal of Pediatric Oncology Nursing: Official Journal of the Association of Pediatric Oncology Nurses
https://www.readbyqxmd.com/read/27863445/dissociable-profiles-of-generalization-discrimination-in-the-human-hippocampus-during-associative-retrieval
#8
Natalie G De Shetler, Jesse Rissman
When encountering stimuli that vary slightly from previous experiences, neural signals within the CA3 and dentate gyrus (CA3 DG) hippocampal subfields are thought to facilitate mnemonic discrimination, whereas CA1 may be less sensitive to minor stimulus changes, allowing for generalization across similar events. Studies have also posited a critical role for CA1 in the comparison of events to memory-derived expectations, but the degree to which these processes are impacted by explicit retrieval demands is yet unclear...
November 18, 2016: Hippocampus
https://www.readbyqxmd.com/read/27861037/identifying-high-risk-older-patients-quickly
#9
(no author information available yet)
An increasing number of older people are using emergency services, but such environments are not designed to address their specific needs and conditions. This article introduces a mnemonic, FRAIL, that is designed to assist nurses to consider falls/functional decline, altered mental status, illnesses and living situations before initiating care.
November 2, 2016: Nursing Standard
https://www.readbyqxmd.com/read/27859884/repetition-reveals-ups-and-downs-of-hippocampal-thalamic-and-neocortical-engagement-during-mnemonic-decisions
#10
Zachariah M Reagh, Elizabeth A Murray, Michael A Yassa
The extent to which current information is consistent with past experiences and our capacity to recognize or discriminate accordingly are key factors in flexible memory-guided behavior. Despite a wealth of evidence linking hippocampal and neocortical computations to these phenomena, many important factors remain poorly understood. One such factor is repeated encoding of learned information. In this experiment, participants completed a task in which study stimuli were incidentally encoded either once or three separate times during high-resolution fMRI scanning...
November 16, 2016: Hippocampus
https://www.readbyqxmd.com/read/27845032/increased-contextual-cue-utilization-with-tdcs-over-the-prefrontal-cortex-during-a-recognition-task
#11
Denise Pergolizzi, Elizabeth F Chua
The precise role of the prefrontal and posterior parietal cortices in recognition performance remains controversial, with questions about whether these regions contribute to recognition via the availability of mnemonic evidence or via decision biases and retrieval orientation. Here we used an explicit memory cueing paradigm, whereby external cues probabilistically predict upcoming memoranda as old or new, in our case with 75% validity, and these cues affect recognition decision biases in the direction of the cue...
November 11, 2016: Brain Research
https://www.readbyqxmd.com/read/27844062/memorable-audiovisual-narratives-synchronize-sensory-and-supramodal-neural-responses
#12
Samantha S Cohen, Lucas C Parra
Our brains integrate information across sensory modalities to generate perceptual experiences and form memories. However, it is difficult to determine the conditions under which multisensory stimulation will benefit or hinder the retrieval of everyday experiences. We hypothesized that the determining factor is the reliability of information processing during stimulus presentation, which can be measured through intersubject correlation of stimulus-evoked activity. We therefore presented biographical auditory narratives and visual animations to 72 human subjects visually, auditorily, or combined, while neural activity was recorded using electroencephalography...
November 2016: ENeuro
https://www.readbyqxmd.com/read/27832265/prevalence-of-semicircular-canal-hypoplasia-in-patients-with-charge-syndrome-3c-syndrome
#13
Andre Wineland, Maithilee D Menezes, Joshua S Shimony, Marwan S Shinawi, Timothy E Hullar, Keiko Hirose
Importance: CHARGE syndrome refers to a syndrome involving coloboma, heart defects, atresia choanae, retardation of growth and development, genitourinary disorders, and ear anomalies. However, Verloes revised the characteristics of CHARGE syndrome in 2005 to define this syndrome more broadly. Deficiency of the semicircular canals is now a major criterion for CHARGE syndrome. Objective: To characterize patients with CHARGE syndrome at our center using Verloes' criteria and to reevaluate the nomenclature for this condition...
November 10, 2016: JAMA Otolaryngology—Head & Neck Surgery
https://www.readbyqxmd.com/read/27824731/the-relationship-between-recognition-memory-for-emotion-laden-words-and-white-matter-microstructure-in-normal-older-individuals
#14
Carina Saarela, Mira Karrasch, Tero Ilvesmäki, Riitta Parkkola, Juha O Rinne, Matti Laine
Functional neuroimaging studies have shown age-related differences in brain activation and connectivity patterns for emotional memory. Previous studies with middle-aged and older adults have reported associations between episodic memory and white matter (WM) microstructure obtained from diffusion tensor imaging, but such studies on emotional memory remain few. To our knowledge, this is the first study to explore associations between WM microstructure as measured by fractional anisotropy (FA) and recognition memory for intentionally encoded positive, negative, and emotionally neutral words using tract-based spatial statistics applied to diffusion tensor imaging images in an elderly sample (44 cognitively intact adults aged 50-79 years)...
December 14, 2016: Neuroreport
https://www.readbyqxmd.com/read/27822732/action-relevance-induces-an-attentional-weighting-of-representations-in-visual-working-memory
#15
Anna Heuer, J Douglas Crawford, Anna Schubö
Information maintained in visual working memory (VWM) can be strategically weighted according to its task-relevance. This is typically studied by presenting cues during the maintenance interval, but under natural conditions, the importance of certain aspects of our visual environment is mostly determined by intended actions. We investigated whether representations in VWM are also weighted with respect to their potential action relevance. In a combined memory and movement task, participants memorized a number of items and performed a pointing movement during the maintenance interval...
November 7, 2016: Memory & Cognition
https://www.readbyqxmd.com/read/27822336/neurobehavioral-and-antioxidant-effects-of-ethanolic-extract-of-yellow-propolis
#16
Cinthia Cristina Sousa de Menezes da Silveira, Luanna Melo Pereira Fernandes, Mallone Lopes Silva, Diandra Araújo Luz, Antônio Rafael Quadros Gomes, Marta Chagas Monteiro, Christiane Schineider Machado, Yohandra Reyes Torres, Tatiana Onofre de Lira, Antonio Gilberto Ferreira, Enéas Andrade Fontes-Júnior, Cristiane Socorro Ferraz Maia
Propolis is a resin produced by bees from raw material collected from plants, salivary secretions, and beeswax. New therapeutic properties for the Central Nervous System have emerged. We explored the neurobehavioral and antioxidant effects of an ethanolic extract of yellow propolis (EEYP) rich in triterpenoids, primarily lupeol and β-amyrin. Male Wistar rats, 3 months old, were intraperitoneally treated with Tween 5% (control), EEYP (1, 3, 10, and 30 mg/kg), or diazepam, fluoxetine, and caffeine (positive controls) 30 min before the assays...
2016: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/27815214/noradrenergic-mechanisms-of-arousal-s-bidirectional-effects-on-episodic-memory
#17
David Clewett, Michiko Sakaki, Shawn Nielsen, Giselle Petzinger, Mara Mather
Arousal's selective effects on cognition go beyond the simple enhancement of emotional stimuli, sometimes enhancing and other times impairing processing of proximal neutral information. Past work shows that arousal impairs encoding of subsequent neutral stimuli regardless of their top-down priority via the engagement of β-adrenoreceptors. In contrast, retrograde amnesia induced by emotional arousal can flip to enhancement when preceding neutral items are prioritized in top-down attention. Whether β-adrenoreceptors also contribute to this retrograde memory enhancement of goal-relevant neutral stimuli is unclear...
November 2, 2016: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/27803331/rapid-and-independent-memory-formation-in-the-parietal-cortex
#18
Svenja Brodt, Dorothee Pöhlchen, Virginia L Flanagin, Stefan Glasauer, Steffen Gais, Monika Schönauer
Previous evidence indicates that the brain stores memory in two complementary systems, allowing both rapid plasticity and stable representations at different sites. For memory to be established in a long-lasting neocortical store, many learning repetitions are considered necessary after initial encoding into hippocampal circuits. To elucidate the dynamics of hippocampal and neocortical contributions to the early phases of memory formation, we closely followed changes in human functional brain activity while volunteers navigated through two different, initially unknown virtual environments...
November 1, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27797805/disconnection-between-the-default-mode-network-and-medial-temporal-lobes-in-post-traumatic-amnesia
#19
Sara De Simoni, Patrick J Grover, Peter O Jenkins, Lesley Honeyfield, Rebecca A Quest, Ewan Ross, Gregory Scott, Mark H Wilson, Paulina Majewska, Adam D Waldman, Maneesh C Patel, David J Sharp
Post-traumatic amnesia is very common immediately after traumatic brain injury. It is characterized by a confused, agitated state and a pronounced inability to encode new memories and sustain attention. Clinically, post-traumatic amnesia is an important predictor of functional outcome. However, despite its prevalence and functional importance, the pathophysiology of post-traumatic amnesia is not understood. Memory processing relies on limbic structures such as the hippocampus, parahippocampus and parts of the cingulate cortex...
October 22, 2016: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/27774683/stress-as-a-mnemonic-filter-interactions-between-medial-temporal-lobe-encoding-processes-and-post-encoding-stress
#20
Maureen Ritchey, Andrew M McCullough, Charan Ranganath, Andrew P Yonelinas
Acute stress has been shown to modulate memory for recently learned information, an effect attributed to the influence of stress hormones on medial temporal lobe (MTL) consolidation processes. However, little is known about which memories will be affected when stress follows encoding. One possibility is that stress interacts with encoding processes to selectively protect memories that had elicited responses in the hippocampus and amygdala, two MTL structures important for memory formation. There is limited evidence for interactions between encoding processes and consolidation effects in humans, but recent studies of consolidation in rodents have emphasized the importance of encoding "tags" for determining the impact of consolidation manipulations on memory...
October 24, 2016: Hippocampus
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