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Working Memory

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https://www.readbyqxmd.com/read/28647624/shape-memory-polyurethanes-with-oxidation-induced-degradation-in-vivo-and-in-vitro-correlations-for-endovascular-material-applications
#1
Andrew C Weems, Kevin T Wacker, James K Carrow, Anthony J Boyle, Duncan J Maitland
The synthesis of thermoset shape memory polymer (SMP) polyurethanes from symmetric, aliphatic alcohols and diisocyanates has previously demonstrated excellent biocompatibility in short term in vitro and in vivo studies, although long term stability has not been investigated. Here we demonstrate that while rapid oxidation occurs in these thermoset SMPs, facilitated by the incorporation of multi-functional, branching amino groups, byproduct analysis does not indicate toxicological concern for these materials...
June 21, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28647452/differential-roles-of-the-infralimbic-and-prelimbic-areas-of-the-prefrontal-cortex-in-reconsolidation-of-a-traumatic-memory
#2
Natali Levin, Milly Kritman, Mouna Maroun, Irit Akirav
Studies about reconsolidation of conditioned fear memories have shown that pharmacological manipulation at memory reactivation can attenuate or enhance the subsequent expression of the conditioned fear response. Here we examined the effects of a single injection of the mTOR inhibitor rapamycin (Rap) into the infralimbic (IL) and prelimbic (PL) areas [which compose the ventromedial prefrontal cortex (PFC)] on reconsolidation and extinction of a traumatic fear memory. We found opposite effects of Rap infused into the PL and IL on reconsolidation and extinction: intra-PL Rap and systemic Rap impaired reconsolidation and facilitated extinction whereas intra-IL Rap enhanced reconsolidation and impaired extinction...
June 22, 2017: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28646791/disorganised-schizotypy-is-selectively-associated-with-poorer-semantic-processing-in-non-clinical-individuals
#3
Eric Josiah Tan, Susan Lee Rossell
The nature and severity of semantic memory (SM) impairments in schizophrenia has been related to symptoms, mainly formal thought disorder (FTD), and other clinical factors like length of illness. Symptom-related studies in schizophrenia are often confounded by clinical factors, for example medication and hospitalisations. We completed a schizotypy analogue study to examine the relationship between SM processing and FTD using an analogue schizotypy score referred to as cognitive disorganisation. Sixty individuals without a history of mental illness (M=22...
June 20, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28646712/prediction-of-vocational-participation-and-global-role-functioning-in-help-seeking-young-adults-from-neurocognitive-demographic-and-clinical-variables
#4
Alice J Cairns, David J Kavanagh, Frances Dark, Steven M McPhail
BACKGROUND: The purpose of this study was to investigate neurocognitive, demographic and clinical correlates of vocational participation among a sample of young help-seeking adults. METHODS: Young people (18-25 years) accessing an early intervention youth health service participated. The Global Functioning: Role scale and level of vocational participation, participant characteristics (age, gender, socioeconomic background and family history of serious mental illness), distress, psychotic-like experiences, substance use, and mental health diagnoses were recorded...
June 13, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28646561/pathways-to-arithmetic-fact-retrieval-and-percentage-calculation-in-adolescents
#5
Ulf Träff, Kenny Skagerlund, Linda Olsson, Rickard Östergren
BACKGROUND: Developing sufficient mathematical skills is a prerequisite to function adequately in society today. Given this, an important task is to increase our understanding regarding the cognitive mechanisms underlying young people's acquisition of early number skills and formal mathematical knowledge. AIMS: The purpose was to examine whether the pathways to mathematics model provides a valid account of the cognitive mechanisms underlying symbolic-number processing and mathematics in adolescents...
June 23, 2017: British Journal of Educational Psychology
https://www.readbyqxmd.com/read/28646419/repetition-blindness-in-priming-in-perceptual-identification-competitive-effects-of-a-word-intervening-between-prime-and-target
#6
Jennifer S Burt, Jessica Jolley
University students named a 72-ms masked target word that was preceded by two 120-ms consecutively presented words, a prime word followed by a distractor. In Experiment 1, all words were in lowercase letters, whereas in Experiment 2, the target word was changed to uppercase letters. In both experiments there was an accuracy and latency cost (repetition blindness: RB) when the prime was the same word as the target, with the cost much less severe in Experiment 2 than in Experiment 1. A low-frequency distractor impaired target identification compared with a high-frequency distractor...
June 23, 2017: Memory & Cognition
https://www.readbyqxmd.com/read/28645546/post-sepsis-cognitive-impairment-and-associated-risk-factors-a-systematic-review
#7
REVIEW
Allan J C Calsavara, Vandack Nobre, Tatiana Barichello, Antonio L Teixeira
INTRODUCTION: Post-sepsis cognitive impairment is one of the major sequelae observed in survivors of sepsis. This cognitive impairment can be global or may affect specific domains. A better understanding of these deficits and associated risk factors could influence the care of patients with sepsis. OBJECTIVE: To perform a systematic review to investigate the presence of cognitive impairment and its associated risk factors among patients who survived sepsis. METHODS: The search was conducted in MEDLINE (1966 to March 2017) and EMBASE (1988 to March 2017)...
June 20, 2017: Australian Critical Care: Official Journal of the Confederation of Australian Critical Care Nurses
https://www.readbyqxmd.com/read/28645192/frequent-sexual-activity-predicts-specific-cognitive-abilities-in-older-adults
#8
Hayley Wright, Rebecca A Jenks, Nele Demeyere
Objectives: This study replicates and extends the findings of previous research (Wright, H., & Jenks, R. A. (2016). Sex on the brain! Associations between sexual activity and cognitive function in older age. Age and Ageing, 45, 313-317. doi:10.1093/ageing/afv197) which found a significant association between sexual activity (SA) and cognitive function in older adults. Specifically, this study aimed to generalize these findings to a range of cognitive domains, and to assess whether increasing SA frequency is associated with increasing scores on a variety of cognitive tasks...
June 21, 2017: Journals of Gerontology. Series B, Psychological Sciences and Social Sciences
https://www.readbyqxmd.com/read/28644541/assessment-of-executive-functioning-in-binge-eating-disorder-independent-of-weight-status
#9
Kalina T Eneva, Jean M Arlt, Angelina Yiu, Susan M Murray, Eunice Y Chen
OBJECTIVE: Executive functioning (EF) problems may serve as vulnerability or maintenance factors for Binge-Eating Disorder (BED). However, it is unclear if EF problems observed in BED are related to overweight status or BED status. The current study extends this literature by examining EF in overweight and normal-weight BED compared to weight-matched controls. METHOD: Participants were normal-weight women with BED (n = 23), overweight BED (n = 32), overweight healthy controls (n = 48), and normal-weight healthy controls (n = 29)...
June 23, 2017: International Journal of Eating Disorders
https://www.readbyqxmd.com/read/28643158/measuring-working-memory-capacity-in-children-using-adaptive-tasks-example-validation-of-an-adaptive-complex-span
#10
Corentin Gonthier, Alexandre Aubry, Béatrice Bourdin
Working memory tasks designed for children usually present trials in order of ascending difficulty, with testing discontinued when the child fails a particular level. Unfortunately, this procedure comes with a number of issues, such as decreased engagement from high-ability children, vulnerability of the scores to temporary mind-wandering, and large between-subjects variations in number of trials, testing time, and proactive interference. To circumvent these problems, the goal of the present study was to demonstrate the feasibility of assessing working memory using an adaptive testing procedure...
June 22, 2017: Behavior Research Methods
https://www.readbyqxmd.com/read/28642698/enhanced-working-memory-binding-by-direct-electrical-stimulation-of-the-parietal-cortex
#11
Agustina Birba, Eugenia Hesse, Lucas Sedeño, Ezequiel P Mikulan, María Del C García, Juan Ávalos, Federico Adolfi, Agustina Legaz, Tristán A Bekinschtein, Máximo Zimerman, Mario Parra, Adolfo M García, Agustín Ibáñez
Recent works evince the critical role of visual short-term memory (STM) binding deficits as a clinical and preclinical marker of Alzheimer's disease (AD). These studies suggest a potential role of posterior brain regions in both the neurocognitive deficits of Alzheimer's patients and STM binding in general. Thereupon, we surmised that stimulation of the posterior parietal cortex (PPC) might be a successful approach to tackle working memory deficits in this condition, especially at early stages. To date, no causal evidence exists of the role of the parietal cortex in STM binding...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28642696/how-accumulated-real-life-stress-experience-and-cognitive-speed-interact-on-decision-making-processes
#12
Eva Friedel, Miriam Sebold, Sören Kuitunen-Paul, Stephan Nebe, Ilya M Veer, Ulrich S Zimmermann, Florian Schlagenhauf, Michael N Smolka, Michael Rapp, Henrik Walter, Andreas Heinz
Rationale: Advances in neurocomputational modeling suggest that valuation systems for goal-directed (deliberative) on one side, and habitual (automatic) decision-making on the other side may rely on distinct computational strategies for reinforcement learning, namely model-free vs. model-based learning. As a key theoretical difference, the model-based system strongly demands cognitive functions to plan actions prospectively based on an internal cognitive model of the environment, whereas valuation in the model-free system relies on rather simple learning rules from operant conditioning to retrospectively associate actions with their outcomes and is thus cognitively less demanding...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28642080/impact-of-juvenile-chronic-stress-on-adult-cortico-accumbal-function-implications-for-cognition-and-addiction
#13
REVIEW
Michael J Watt, Matthew A Weber, Shaydel R Davies, Gina L Forster
Repeated exposure to stress during childhood is associated with increased risk for neuropsychiatric illness, substance use disorders and other behavioral problems in adulthood. However, it is not clear how chronic childhood stress can lead to emergence of such a wide range of symptoms and disorders in later life. One possible explanation lies in stress-induced disruption to the development of specific brain regions associated with executive function and reward processing, deficits in which are common to the disorders promoted by childhood stress...
June 19, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28641817/-preventing-violence-in-schizophrenia-with-cognitive-remediation
#14
C Darmedru, C Demily, N Franck
OBJECTIVES: The association between schizophrenia and violence represents an important issue in psychiatry. Often highly publicized, violent acts raise the question of their detection, prevention, management and treatment. There is no single, direct and exclusive link between aggressiveness and the underlying psychiatric disorder. On the contrary, the processes underlying this violence are multiple and interlinked. In addition to static and dynamic risk factors, cognitive deficits play an important role in the genesis and maintenance of violent and aggressive behavior...
June 19, 2017: L'Encéphale
https://www.readbyqxmd.com/read/28641679/normobaric-hypoxia-and-submaximal-exercise-effects-on-running-memory-and-mood-state-in-women
#15
Yongsuk Seo, Hayden D Gerhart, Jon Stavres, Curtis Fennell, Shane Draper, Ellen L Glickman
BACKGROUND: An acute bout of exercise can improve cognitive function in normoxic and hypoxic conditions. However, limited research supports the improvement of cognitive function and mood state in women. The purpose of this study was to examine the effects of hypoxia and exercise on working memory and mood state in women. METHODS: There were 15 healthy women (age = 22 ± 2 yr) who completed the Automated Neuropsychological Assessment Metrics-4th Edition (ANAM), including the Running Memory Continuous Performance Task (RMCPT) and Total Mood Disturbance (TMD) in normoxia (21% O2), at rest in normoxia and hypoxia (12...
July 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28641496/guanfacine-attenuates-adverse-effects-of-dronabinol-thc-on-working-memory-in-adolescent-onset-heavy-cannabis-users-a-pilot-study
#16
David S Mathai, Manuela Holst, Christopher Rodgman, Colin N Haile, Jake Keller, Mariyah Z Hussain, Thomas R Kosten, Thomas F Newton, Christopher D Verrico
The cannabinoid-1 receptor (CB1R) agonist Δ9-tetrahydrocannabinol (THC), the main psychoactive constituent of cannabis, adversely effects working memory performance in humans. The α2A-adrenoceptor (AR) agonist guanfacine improves working memory performance in humans. The authors aimed to determine the effects of short-term (6 days) treatment with guanfacine on adverse cognitive effects produced by THC. Employing a double-blind, placebo-controlled crossover design, the cognitive, subjective, and cardiovascular effects produced by oral THC (20 mg) administration were determined twice in the same cannabis users: once after treatment with placebo and once after treatment with guanfacine (3 mg/day)...
June 23, 2017: Journal of Neuropsychiatry and Clinical Neurosciences
https://www.readbyqxmd.com/read/28641214/motor-system-dysfunction-in-the-schizophrenia-diathesis-neural-systems-to-neurotransmitters
#17
R Abboud, C Noronha, V A Diwadkar
Motor control is a ubiquitous aspect of human function, and from its earliest origins, abnormal motor control has been proposed as being central to schizophrenia. The neurobiological architecture of the motor system is well understood in primates and involves cortical and sub-cortical components including the primary motor cortex, supplementary motor area, dorsal anterior cingulate cortex, the prefrontal cortex, the basal ganglia, and cerebellum. Notably all of these regions are associated in some manner to the pathophysiology of schizophrenia...
April 25, 2017: European Psychiatry: the Journal of the Association of European Psychiatrists
https://www.readbyqxmd.com/read/28641120/the-cognitive-bases-of-the-development-of-past-and-future-episodic-cognition-in-preschoolers
#18
Gülten Ünal, Annette Hohenberger
The aim of this study was to use a minimalist framework to examine the joint development of past and future episodic cognition and their underlying cognitive abilities in 3- to 5-year-old Turkish preschoolers. Participants engaged in two main tasks, a what-where-when (www) task to measure episodic memory and a future prediction task to measure episodic future thinking. Three additional tasks were used for predicting children's performance in the two main tasks: a temporal language task, an executive function task, and a spatial working memory task...
June 19, 2017: Journal of Experimental Child Psychology
https://www.readbyqxmd.com/read/28640585/thermally-and-electrically-triggered-triple-shape-memory-behavior-of-poly-vinyl-acetate-poly-lactic-acid-due-to-graphene-induced-phase-separation
#19
Mohammad Sabzi, Masoud Babaahmadi, Mohammadreza Rahnama
This work aimed to develop a facile and broadly applicable method for fabricating a multi-stimuli responsive triple-shape memory polymer (SMP). Hence, herein the SMPs were prepared through the simple physical blending of two commercially available biopolymers, poly(lactic acid) (PLA) and poly(vinyl acetate) (PVAc), in the presence of robust and conductive graphene nanoplatelets. Interestingly, atomic force microscopy (AFM) observations and thermal analyses revealed that the presence of nanofillers led to phase separation and appearance of two well-separated transition temperatures in the blend of these two miscible polymers...
June 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28639800/working-memory-capacity-and-the-antisaccade-task-a-microanalytic-macroanalytic-investigation-of-individual-differences-in-goal-activation-and-maintenance
#20
Matt E Meier, Bridget A Smeekens, Paul J Silvia, Thomas R Kwapil, Michael J Kane
The association between working memory capacity (WMC) and the antisaccade task, which requires subjects to move their eyes and attention away from a strong visual cue, supports the claim that WMC is partially an attentional construct (Kane, Bleckley, Conway, & Engle, 2001; Unsworth, Schrock, & Engle, 2004). Specifically, the WMC-antisaccade relation suggests that WMC helps maintain and execute task goals despite interference from habitual actions. Related work has recently shown that mind wandering (McVay & Kane, 2009, 2012a, 2012b) and reaction time (RT) variability (Unsworth, 2015) are also related to WMC and they partially explain WMC's prediction of cognitive abilities...
June 22, 2017: Journal of Experimental Psychology. Learning, Memory, and Cognition
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