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https://www.readbyqxmd.com/read/28335018/dissecting-gamma-frequency-activity-during-human-memory-processing
#1
Michal T Kucewicz, Brent M Berry, Vaclav Kremen, Benjamin H Brinkmann, Michael R Sperling, Barbara C Jobst, Robert E Gross, Bradley Lega, Sameer A Sheth, Joel M Stein, Sandthitsu R Das, Richard Gorniak, S Matthew Stead, Daniel S Rizzuto, Michael J Kahana, Gregory A Worrell
Gamma frequency activity (30-150 Hz) is induced in cognitive tasks and is thought to reflect underlying neural processes. Gamma frequency activity can be recorded directly from the human brain using intracranial electrodes implanted in patients undergoing treatment for drug-resistant epilepsy. Previous studies have independently explored narrowband oscillations in the local field potential and broadband power increases. It is not clear, however, which processes contribute to human brain gamma frequency activity, or their dynamics and roles during memory processing...
March 13, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28334487/growing-up-with-perinatal-human-immunodeficiency-virus-a-life-not-expected
#2
Elaine Fay Williams
AIM AND OBJECTIVES: To describe the lived experience of young adults with perinatally acquired HIV (PaHIV). BACKGROUND: The advancement of the highly active antiretroviral treatment, PaHIV-infection has transformed into a chronic lifelong illness that is faced by young adults who grew up with HIV. The known challenges that are associated with HIV are poverty, stigma and social and emotional isolation. DESIGN: This was a qualitative single interview study of a convenience sample of PaHIV-infected young adults receiving care at a large metropolitan pediatric hospital...
March 23, 2017: Journal of Clinical Nursing
https://www.readbyqxmd.com/read/28334352/the-human-neural-alpha-response-to-speech-is-a-proxy-of-attentional-control
#3
Malte Wöstmann, Sung-Joo Lim, Jonas Obleser
Human alpha (~10 Hz) oscillatory power is a prominent neural marker of cognitive effort. When listeners attempt to process and retain acoustically degraded speech, alpha power enhances. It is unclear whether these alpha modulations reflect the degree of acoustic degradation per se or the degradation-driven demand to a listener's attentional control. Using an irrelevant-speech paradigm and measuring the electroencephalogram (EEG), the current experiment demonstrates that the neural alpha response to speech is a surprisingly clear proxy of top-down control, entirely driven by the listening goals of attending versus ignoring degraded speech...
March 18, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28334147/variations-in-acetylcholinesterase-activity-within-human-cortical-pyramidal-neurons-across-age-and-cognitive-trajectories
#4
Monica Janeczek, Tamar Gefen, Mehrnoosh Samimi, Garam Kim, Sandra Weintraub, Eileen Bigio, Emily Rogalski, M-Marsel Mesulam, Changiz Geula
We described an extensive network of cortical pyramidal neurons in the human brain with abundant acetylcholinesterase (AChE) activity. Emergence of these neurons during childhood/adolescence, attainment of highest density in early adulthood, and virtual absence in other species led us to hypothesize involvement of AChE within these neurons in higher cortical functions. The current study quantified the density and staining intensity of these neurons using histochemical procedures. Few faintly stained AChE-positive cortical pyramidal neurons were observed in children/adolescents...
March 1, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28333494/taxonomic-and-thematic-semantic-systems
#5
Daniel Mirman, Jon-Frederick Landrigan, Allison E Britt
Object concepts are critical for nearly all aspects of human cognition, from perception tasks like object recognition, to understanding and producing language, to making meaningful actions. Concepts can have 2 very different kinds of relations: similarity relations based on shared features (e.g., dog-bear), which are called "taxonomic" relations, and contiguity relations based on co-occurrence in events or scenarios (e.g., dog-leash), which are called "thematic" relations. Here, we report a systematic review of experimental psychology and cognitive neuroscience evidence of this distinction in the structure of semantic memory...
March 23, 2017: Psychological Bulletin
https://www.readbyqxmd.com/read/28333487/adaptation-of-the-arizona-cognitive-task-battery-for-use-with-the-ts65dn-mouse-model-mus-musculus-of-down-syndrome
#6
Michael R Hunsaker, Genevieve K Smith, Raymond P Kesner
We propose and validate a clear strategy to efficiently and comprehensively characterize neurobehavioral deficits in the Ts65Dn mouse model of Down syndrome. This novel approach uses neurocognitive theory to design and select behavioral tasks that test specific hypotheses concerning the results of Down syndrome. In this article, we model the Arizona Cognitive Task Battery, used to study human populations with Down syndrome, in Ts65Dn mice. We observed specific deficits for spatial memory, impaired long-term memory for visual objects, acquisition and reversal of motor responses, reduced motor dexterity, and impaired adaptive function as measured by nesting and anxiety tasks...
March 23, 2017: Journal of Comparative Psychology
https://www.readbyqxmd.com/read/28333243/polycystic-ovary-syndrome-is-associated-with-anogenital-distance-a-marker-of-prenatal-androgen-exposure
#7
Yingchen Wu, Guangzheng Zhong, Shengfu Chen, Chengyu Zheng, Dehua Liao, Meiqing Xie
STUDY QUESTION: Is the presence of polycystic ovary syndrome (PCOS) associated with anogenital distance (AGD), a biomarker for the prenatal hormonal environment? SUMMARY ANSWER: The presence of PCOS is associated with longer AGD. WHAT IS KNOWN ALREADY: Although the aetiology of PCOS is unclear, emerging data suggest that the natural history of PCOS may originate from intrauterine life. Prenatal exposure to androgen hormones is considered an important factor of PCOS...
March 1, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28332333/allo-hla-cross-reactivities-of-cmv-flu-and-vzv-specific-memory-t-cells-are-shared-by-different-individuals
#8
H van den Heuvel, K M Heutinck, E M W van der Meer-Prins, S L Yong, P P M C van Miert, J D H Anholts, M E I Franke-van Dijk, X Q Zhang, D L Roelen, R J M Ten Berge, F H J Claas
Virus-specific T cells can recognize allogeneic HLA (allo-HLA) through TCR cross-reactivity. The allospecificity often differs per individual ("private cross-reactivity"), but can also be shared by multiple individuals ("public cross-reactivity"). However, only a few examples of the latter have been described. Since these could facilitate alloreactivity prediction in transplantation, we aimed to identify novel public cross-reactivities of human virus-specific CD8+ T cells directed against allo-HLA by assessing their reactivity in mixed-lymphocyte reactions...
March 23, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/28330987/architecture-and-mechanism-of-the-central-gear-in-an-ancient-molecular-timer
#9
REVIEW
Martin Egli
Molecular clocks are the product of natural selection in organisms from bacteria to human and their appearance early in evolution such as in the prokaryotic cyanobacterium Synechococcus elongatus suggests that these timers served a crucial role in genetic fitness. Thus, a clock allows cyanobacteria relying on photosynthesis and nitrogen fixation to temporally space the two processes and avoid exposure of nitrogenase carrying out fixation to high levels of oxygen produced during photosynthesis. Fascinating properties of molecular clocks are the long time constant, their precision and temperature compensation...
March 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28330898/antigen-presenting-human-%C3%AE-%C3%AE-t-cells-promote-intestinal-cd4-t-cell-expression-of-il-22-and-mucosal-release-of-calprotectin
#10
Christopher J Tyler, Neil E McCarthy, James O Lindsay, Andrew J Stagg, Bernhard Moser, Matthias Eberl
The cytokine IL-22 plays a critical role in mucosal barrier defense, but the mechanisms that promote IL-22 expression in the human intestine remain poorly understood. As human microbe-responsive Vγ9/Vδ2 T cells are abundant in the gut and recognize microbiota-associated metabolites, we assessed their potential to induce IL-22 expression by intestinal CD4(+) T cells. Vγ9/Vδ2 T cells with characteristics of APCs were generated from human blood and intestinal organ cultures, then cocultured with naive and memory CD4(+) T cells obtained from human blood or the colon...
March 22, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28330742/fellow-travellers-working-memory-and-mental-time-travel-in-rodents
#11
REVIEW
Ekrem Dere, Dorothea Dere, Maria Angelica de Souza Silva, Joseph P Huston, Armin Zlomuzica
The impairment of mental time travel is a severe cognitive symptom in patients with brain lesions and a number of neuropsychiatric disorders. Whether animals are also able to mentally travel in time both forward and backward is still a matter of debate. In this regard, we have proposed a continuum of mental time travel abilities across different animal species, with humans being the species with the ability to perform most sophisticated forms of mental time travel. In this review and perspective article, we delineate a novel approach to understand the evolution, characteristics and function of human and animal mental time travel...
March 18, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28328093/race-in-an-epigenetic-time-thinking-biology-in-the-plural
#12
Maurizio Meloni
The notion that biological memories of environmental experiences can be embedded in the human genome and even transmitted transgenerationally is increasingly relevant in the postgenomic world, particularly in molecular epigenetics, where the genome is conceptualized as porous to environmental signals. In this article I discuss the current rethinking of race in epigenetic rather than genetic terms, emphasizing some of its paradoxical implications, especially for public policy. I claim in particular that: (i) if sociologists want to investigate race in a postgenomic world they should pay more attention to this novel plastic and biosocial view of race; and (ii) there are no reasons to believe that an epigenetic view will extinguish race, or that soft-inheritance claims will produce a less exclusionary discourse than genetics (hard heredity)...
March 22, 2017: British Journal of Sociology
https://www.readbyqxmd.com/read/28326050/what-to-choose-next-a-paradigm-for-testing-human-sequential-decision-making
#13
Elisa M Tartaglia, Aaron M Clarke, Michael H Herzog
Many of the decisions we make in our everyday lives are sequential and entail sparse rewards. While sequential decision-making has been extensively investigated in theory (e.g., by reinforcement learning models) there is no systematic experimental paradigm to test it. Here, we developed such a paradigm and investigated key components of reinforcement learning models: the eligibility trace (i.e., the memory trace of previous decision steps), the external reward, and the ability to exploit the statistics of the environment's structure (model-free vs...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28326037/differences-on-brain-connectivity-in-adulthood-are-present-in-subjects-with-iron-deficiency-anemia-in-infancy
#14
Cecilia Algarin, Keerthana Deepti Karunakaran, Sussanne Reyes, Cristian Morales, Betsy Lozoff, Patricio Peirano, Bharat Biswal
Iron deficiency continues to be the most prevalent micronutrient deficit worldwide. Since iron is involved in several processes including myelination, dopamine neurotransmission and neuronal metabolism, the presence of iron deficiency anemia (IDA) in infancy relates to long-lasting neurofunctional effects. There is scarce data regarding whether these effects would extend to former iron deficient anemic human adults. Resting state functional magnetic resonance imaging (fMRI) is a novel technique to explore patterns of functional connectivity...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28324947/a-sparse-laguerre-volterra-autoregressive-model-for-seizure-prediction-in-temporal-lobe-epilepsy
#15
Pen-Ning Yu, Shokofeh A Naiini, Christi N Heck, Charles Y Liu, Dong Song, Theodore W Berger
A sparse Laguerre-Volterra autoregressive model has been developed as feature extraction from subdural human EEG data for seizure prediction in temporal lobe epilepsy. The use of Laguerre-Volterra kernel can compactly yield an autoregressive model of longer system memory without increasing the number of the coefficients. In 6 sets of seizure, we used a sparse Laguerre-Volterra autoregressive model with 6 coefficients and the decay parameter of 0.2 and obtained the 10-fold cross-validation prediction results of high Matthews correlation coefficients (0...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28323200/brief-exercise-enhances-intrusive-memories-of-traumatic-stimuli
#16
Dharani Keyan, Richard A Bryant
Brief physical exercise enhances memories for neutral events, and recently has been shown to modulate fear learning in animals. To date there is no evidence pertaining to the impact of exercise on emotional memories in humans. Accordingly, this study investigated the role of brief exercise in the development of emotional intrusive memories. Forty-nine university students (18-29 year olds) viewed a car accident film depicting accident and injury, and were then randomly assigned to engage in either 10 minutes of intense exercise or easy walking...
March 17, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28322863/deep-immune-profiling-by-mass-cytometry-links-human-t-and-nk-cell-differentiation-and-cytotoxic-molecule-expression-patterns
#17
Bertram Bengsch, Takuya Ohtani, Ramin Sedaghat Herati, Niels Bovenschen, Kyong-Mi Chang, E John Wherry
The elimination of infected or tumor cells by direct lysis is a key T and NK cell effector function. T and NK cells can kill target cells by coordinated secretion of cytotoxic granules containing one or both pore-forming proteins, perforin and granulysin and combinations of granzyme (Gzm) family effector proteases (in humans: Gzm A, B, K, M and H). Understanding the pattern of expression of cytotoxic molecules and the relationship to different states of T and NK cells may have direct relevance for immune responses in autoimmunity, infectious disease and cancer...
March 17, 2017: Journal of Immunological Methods
https://www.readbyqxmd.com/read/28322235/impact-of-tryptophan-depletion-on-executive-system-function-during-menopause-is-moderated-by-childhood-adversity
#18
Sheila Shanmugan, James Loughead, Wen Cao, Mary D Sammel, Theodore D Satterthwaite, Kosha Ruparel, Ruben C Gur, C Neill Epperson
Many healthy women with no history of cognitive dysfunction experience subjective executive difficulties during menopause. Preclinical literature suggests latent effects of early life adversity on serotonin function may play a role in this phenomenon. However, evidence in human participants regarding the mechanisms by which loss of estradiol contributes to this vulnerability is lacking. Here we examined the impact of tryptophan depletion (TD) and adverse childhood experiences (ACE) on brain activation during a working memory task in menopausal women...
March 21, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28322202/genetic-epistasis-regulates-amyloid-deposition-in-resilient-aging
#19
Daniel Felsky, Jishu Xu, Lori Chibnik, Julie Schneider, Jo Knight, James L Kennedy, David A Bennett, Philip L De Jager, Aristotle N Voineskos
INTRODUCTION: The brain-derived neurotrophic factor (BDNF) interacts with important genetic Alzheimer's disease (AD) risk factors. Specifically, variants within the SORL1 gene determine BDNF's ability to reduce amyloid β (Aβ) in vitro. We sought to test whether functional BDNF variation interacts with SORL1 genotypes to influence expression and downstream AD-related processes in humans. METHODS: We analyzed postmortem brain RNA sequencing and neuropathological data for 441 subjects from the Religious Orders Study/Memory and Aging Project and molecular and structural neuroimaging data for 1285 subjects from the Alzheimer's Disease Neuroimaging Initiative...
March 16, 2017: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/28320847/multivoxel-pattern-analysis-reveals-3d-place-information-in-the-human-hippocampus
#20
Misun Kim, Kate J Jeffery, Eleanor A Maguire
The spatial world is three-dimensional (3D), and humans and other animals move both horizontally and vertically within it. Extant neuroscientific studies have typically investigated spatial navigation on a horizontal two-dimensional plane, leaving much unknown about how 3D spatial information is represented in the brain. Specifically, horizontal and vertical information may be encoded in the same or different neural structures with equal or unequal sensitivity. Here, we investigated these possibilities using functional MRI (fMRI) while participants were passively moved within a 3D lattice structure as if riding a rollercoaster...
March 20, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
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