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https://www.readbyqxmd.com/read/28241404/hippocampal-neural-activity-reflects-the-economy-of-choices-during-goal-directed-navigation
#1
Valerie L Tryon, Marsha R Penner, Shawn W Heide, Hunter O King, Joshua Larkin, Sheri J Y Mizumori
Distinguishing spatial contexts is likely essential for the well-known role of the hippocampus in episodic memory. We studied whether types of hippocampal neural organization thought to underlie context discrimination is impacted by learned economic considerations of choice behavior. Hippocampal place cells and theta activity were recorded as rats performed a maze-based probability discounting task that involved choosing between a small certain reward or a large probabilistic reward. Different spatial distributions of place fields were observed in response to changes in probability, the outcome of the rats' choice, and whether or not rats were free to make that choice...
February 27, 2017: Hippocampus
https://www.readbyqxmd.com/read/28241401/hippocampal-cortical-contributions-to-strategic-exploration-during-perceptual-discrimination
#2
Joel L Voss, Neal J Cohen
The hippocampus is crucial for long-term memory; its involvement in short-term or immediate expressions of memory is more controversial. Rodent hippocampus has been implicated in an expression of memory that occurs on-line during exploration termed "vicarious trial-and-error" (VTE) behavior. VTE occurs when rodents iteratively explore options during perceptual discrimination or at choice points. It is strategic in that it accelerates learning and improves later memory. VTE has been associated with activity of rodent hippocampal neurons, and lesions of hippocampus disrupt VTE and associated learning and memory advantages...
February 27, 2017: Hippocampus
https://www.readbyqxmd.com/read/28241180/reevaluating-the-efficacy-and-predictability-of-antidepressant-treatments-a-symptom-clustering-approach
#3
Adam M Chekroud, Ralitza Gueorguieva, Harlan M Krumholz, Madhukar H Trivedi, John H Krystal, Gregory McCarthy
Importance: Depressive severity is typically measured according to total scores on questionnaires that include a diverse range of symptoms despite convincing evidence that depression is not a unitary construct. When evaluated according to aggregate measurements, treatment efficacy is generally modest and differences in efficacy between antidepressant therapies are small. Objectives: To determine the efficacy of antidepressant treatments on empirically defined groups of symptoms and examine the replicability of these groups...
February 22, 2017: JAMA Psychiatry
https://www.readbyqxmd.com/read/28241061/a-computational-model-of-the-integration-of-landmarks-and-motion-in-the-insect-central-complex
#4
Alex J Cope, Chelsea Sabo, Eleni Vasilaki, Andrew B Barron, James A R Marshall
The insect central complex (CX) is an enigmatic structure whose computational function has evaded inquiry, but has been implicated in a wide range of behaviours. Recent experimental evidence from the fruit fly (Drosophila melanogaster) and the cockroach (Blaberus discoidalis) has demonstrated the existence of neural activity corresponding to the animal's orientation within a virtual arena (a neural 'compass'), and this provides an insight into one component of the CX structure. There are two key features of the compass activity: an offset between the angle represented by the compass and the true angular position of visual features in the arena, and the remapping of the 270° visual arena onto an entire circle of neurons in the compass...
2017: PloS One
https://www.readbyqxmd.com/read/28240927/contralateral-interictal-and-ictal-eeg-epileptiform-activity-accentuate-memory-impairment-in-unilateral-mesial-temporal-sclerosis-patients
#5
Lecio F Pinto, Carla C Adda, Liliane C A Silva, Natalie H C Banaskiwitz, Valmir Passarelli, Carmen L Jorge, Rosa M Valerio, Luiz H Castro
OBJECTIVE: Memory impairment is a recognized complication of mesial temporal sclerosis (MTS). Epileptiform activity may negatively impact on cognition. We evaluated the impact of contralateral EEG involvement on memory in unilateral MTS (uMTS) patients. METHOD: Retrospective review of 121 right-handed uMTS patients (69 left) evaluated with prolonged video-EEG and verbal and nonverbal memory tests (Rey Auditory Verbal Learning Test and Rey-Osterrieth Complex figure), with additional very delayed trials...
March 2017: Neuropsychology
https://www.readbyqxmd.com/read/28240742/dna-methylation-mediates-neural-processing-after-odor-learning-in-the-honeybee
#6
Stephanie D Biergans, Charles Claudianos, Judith Reinhard, C Giovanni Galizia
DNA methyltransferases (Dnmts) - epigenetic writers catalyzing the transfer of methyl-groups to cytosine (DNA methylation) - regulate different aspects of memory formation in many animal species. In honeybees, Dnmt activity is required to adjust the specificity of olfactory reward memories and bees' relearning capability. The physiological relevance of Dnmt-mediated DNA methylation in neural networks, however, remains unknown. Here, we investigated how Dnmt activity impacts neuroplasticity in the bees' primary olfactory center, the antennal lobe (AL) an equivalent of the vertebrate olfactory bulb...
February 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28240598/feedback-for-reinforcement-learning-based-brain-machine-interfaces-using-confidence-metrics
#7
Noeline Prins, Justin Sanchez, Abhishek Prasad
OBJECTIVE: For Brain-Machine Interfaces (BMI) to be used in activities of daily living by paralyzed individuals, the BMI should be as autonomous as possible. One of the challenges is how the feedback is extracted and utilized in the BMI. Our long-term goal is to create autonomous BMIs that can utilize an evaluative feedback from the brain to update the decoding algorithm and use it intelligently in order to adapt the decoder. In this study, we show how to extract the necessary evaluative feedback from a biologically realistic (synthetic) source, use both the quantity and the quality of the feedback, and how that feedback information can be incorporated into a reinforcement learning (RL) controller architecture to maximize its performance...
February 27, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28240187/the-endocannabinoid-system-modulating-levels-of-consciousness-emotions-and-likely-dream-contents
#8
Eric Murillo-Rodriguez, José Carlos Pastrana-Trejo, Mireille Salas-Crisóstomo, Miriel de-la-Cruz
Cannabinoids are derivatives that are either compounds occurring naturally in the plant, Cannabis sativa or synthetic analogs of these molecules. The first and most widely investigated of the cannabinoids is ∆9-tetrahydrocannabinol (Δ9-THC), which is the main psychotropic constituent of cannabis and undergoes significant binding to cannabinoid receptors. These cannabinoid receptors are seven-transmembrane receptors that received their name from the fact that they respond to cannabinoid compounds, including Δ9-THC...
February 23, 2017: CNS & Neurological Disorders Drug Targets
https://www.readbyqxmd.com/read/28239790/antibodies-to-glutamate-reversed-the-amnesic-effects-of-proinflammatory-s100a9-protein-fibrils-in-aged-c57bl-6-mice
#9
M A Gruden, T V Davydova, V G Fomina, L A Vetrile, L A Morozova-Roche, R D E Sewell
Chronic intranasal administration of fibrillar structures of proinflammatory S100A9 protein impaired passive avoidance learning in old C57Bl/6 mice. Combined treatment with S100A9 fibrils and antibodies to glutamate was followed by an increase in horizontal locomotor activity of animals in the open-field test and did not disturb spatial memory.
February 27, 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28239676/intact-ventral-striatal-prediction-error-signaling-in-medicated-schizophrenia-patients
#10
Adam J Culbreth, Andrew Westbrook, Ziye Xu, Deanna M Barch, James A Waltz
BACKGROUND: Midbrain dopaminergic neurons code a computational quantity, reward prediction error (RPE), which has been causally related to learning. Recently, this insight has been leveraged to link phenomenological and biological levels of understanding in psychiatric disorders, such as schizophrenia. However, results have been mixed, possibly due to small sample sizes. Here we present results from two studies with relatively large Ns to assess VS RPE in schizophrenia. METHODS: In the current study we analyzed data from two independent studies, involving a total of 87 chronic medicated schizophrenia patients and 61 controls...
September 2016: Biological Psychiatry: Cognitive Neuroscience and Neuroimaging
https://www.readbyqxmd.com/read/28239597/perceived-cognitive-deficits-are-associated-with-diabetes-self-management-in-a-multiethnic-sample
#11
Heather Cuevas, Alexa Stuifbergen
BACKGROUND: People with diabetes have almost twice the risk of developing cognitive impairment or dementia as do those without diabetes, and about half of older adults with diabetes will become functionally disabled or cognitively impaired. But diabetes requires complex self-management: patients must learn about the implications of their disease; manage their diets, physical activity, and medication; and monitor their blood glucose. Difficulties with cognition can hinder these activities...
2017: Journal of Diabetes and Metabolic Disorders
https://www.readbyqxmd.com/read/28239389/harnessing-evolutionary-toxins-for-signaling-reactive-oxygen-species-nitric-oxide-and-hydrogen-sulfide-in-plant-cell-regulation
#12
John T Hancock
During the early periods of evolution, as well as in niche environments today, organisms have had to learn to tolerate the presence of many reactive compounds, such as reactive oxygen species, nitric oxide, and hydrogen sulfide. It is now known that such compounds are instrumental in the signaling processes in plant cells. There are enzymes which can make them, while downstream of their signaling pathways are coming to light. These include the production of cGMP, the activation of MAP kinases and transcription factors, and the modification of thiol groups on many proteins...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28239363/formal-and-informal-learning-and-first-year-psychology-students-development-of-scientific-thinking-a-two-wave-panel-study
#13
Demet Soyyılmaz, Laura M Griffin, Miguel H Martín, Šimon Kucharský, Ekaterina D Peycheva, Nina Vaupotič, Peter A Edelsbrunner
Scientific thinking is a predicate for scientific inquiry, and thus important to develop early in psychology students as potential future researchers. The present research is aimed at fathoming the contributions of formal and informal learning experiences to psychology students' development of scientific thinking during their 1st-year of study. We hypothesize that informal experiences are relevant beyond formal experiences. First-year psychology student cohorts from various European countries will be assessed at the beginning and again at the end of the second semester...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28238832/the-energetic-physiological-and-behavioral-response-of-lemon-sharks-negaprion-brevirostris-to-simulated-longline-capture
#14
Ian A Bouyoucos, Cory D Suski, John W Mandelman, Edward J Brooks
Commercial fisheries bycatch is a considerable threat to elasmobranch population recovery, and techniques to mitigate sub-lethal consequences can be improved with data on the energetic, physiological, and behavioral response of individuals to capture. This study sought to estimate the effects of simulated longline capture on the behavior, energy use, and physiological stress of juvenile lemon sharks (Negaprion brevirostris). Captive sharks equipped with acceleration biologgers were subjected to one hour of simulated longline capture...
February 23, 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/28238656/moonwalker-descending-neurons-mediate-visually-evoked-retreat-in-drosophila
#15
Rajyashree Sen, Ming Wu, Kristin Branson, Alice Robie, Gerald M Rubin, Barry J Dickson
Insects, like most animals, tend to steer away from imminent threats [1-7]. Drosophila melanogaster, for example, generally initiate an escape take-off in response to a looming visual stimulus, mimicking a potential predator [8]. The escape response to a visual threat is, however, flexible [9-12] and can alternatively consist of walking backward away from the perceived threat [11], which may be a more effective response to ambush predators such as nymphal praying mantids [7]. Flexibility in escape behavior may also add an element of unpredictability that makes it difficult for predators to anticipate or learn the prey's likely response [3-6]...
February 15, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28238591/attitudes-and-experiences-of-early-and-midcareer-pediatricians-with-the-maintenance-of-certification-process
#16
Bobbi J Byrne, Mary Pat Frintner, Heather N Abraham, Amy J Starmer
OBJECTIVE: Maintenance of certification (MOC) value and relevance have been recent topics of controversy and discussion in medicine. Systematically assessing pediatrician's attitudes and experiences to encourage and inform future modifications is important. METHODS: We surveyed 866 pediatricians in 2014 who graduated from residency 10 to 12 years ago and are part of a larger longitudinal study. Cross-sectional quantitative and qualitative data on understanding, attitudes, barriers, and needs specific to MOC part 2 (self-assessment/continued learning activities) and part 4 (quality improvement projects) were analyzed...
February 23, 2017: Academic Pediatrics
https://www.readbyqxmd.com/read/28238549/population-coding-in-an-innately-relevant-olfactory-area
#17
Giuliano Iurilli, Sandeep Robert Datta
Different olfactory cortical regions are thought to harbor distinct sensory representations, enabling each area to play a unique role in odor perception and behavior. In the piriform cortex (PCx), spatially dispersed sensory inputs evoke activity in distributed ensembles of neurons that act as substrates for odor learning. In contrast, the posterolateral cortical amygdala (plCoA) receives hardwired inputs that may link specific odor cues to innate olfactory behaviors. Here we show that despite stark differences in the patterning of plCoA and PCx inputs, odor-evoked neural ensembles in both areas are equally capable of discriminating odors, and exhibit similar odor tuning, reliability, and correlation structure...
February 18, 2017: Neuron
https://www.readbyqxmd.com/read/28238548/context-and-output-layer-dependent-long-term-ensemble-plasticity-in-a-sensory-circuit
#18
Yoshiyuki Yamada, Khaleel Bhaukaurally, Tamás J Madarász, Alexandre Pouget, Ivan Rodriguez, Alan Carleton
Sensory information is translated into ensemble representations by various populations of projection neurons in brain circuits. The dynamics of ensemble representations formed by distinct channels of output neurons in diverse behavioral contexts remains largely unknown. We studied the two output neuron layers in the olfactory bulb (OB), mitral and tufted cells, using chronic two-photon calcium imaging in awake mice. Both output populations displayed similar odor response profiles. During passive sensory experience, both populations showed reorganization of ensemble odor representations yet stable pattern separation across days...
February 18, 2017: Neuron
https://www.readbyqxmd.com/read/28238320/-oxytocin-administration-during-spontaneous-labour-guidelines-for-clinical-practice-guidelines-short-text
#19
C Dupont, M Carayol, C Le Ray, C Barasinski, R Beranger, A Burguet, A Chantry, C Chiesa, B Coulm, A Evrard, C Fischer, L Gaucher, C Guillou, F Leroy, E Phan, A Rousseau, V Tessier, F Vendittelli, C Deneux-Tharaux, D Riethmuller
OBJECTIVES: To define the different stages of spontaneous labour. To determine the indications, modalities of use and the effects of administering synthetic oxytocin. And to describe undesirable maternal and perinatal outcomes associated with the use of synthetic oxytocin. METHOD: A systematic review was carried out by searching Medline database and websites of obstetrics learned societies until March 2016. RESULTS: The 1st stage of labor is divided in a latence phase and an active phase, which switch at 5cm of cervical dilatation...
January 2017: Gynecol Obstet Fertil Senol
https://www.readbyqxmd.com/read/28238167/effects-of-cox1-2-5-lox-blockade-in-alzheimer-transgenic-3xtg-ad-mice
#20
Alessandra Bitto, Daniela Giuliani, Giovanni Pallio, Natasha Irrera, Eleonora Vandini, Fabrizio Canalini, Davide Zaffe, Alessandra Ottani, Letteria Minutoli, Mariagrazia Rinaldi, Salvatore Guarini, Francesco Squadrito, Domenica Altavilla
OBJECTIVE AND DESIGN: Alzheimer's disease (AD) is associated with amyloid plaques (Aβ) and hyperphosphorylated tau protein tangles in the brain. We investigated the possible neuroprotective role of flavocoxid, a dual inhibitor of cyclooxygenases-1/2 (COX-1/2) and 5-Lipoxygenase (5-LOX), in triple-transgenic (3xTg-AD) mice. SUBJECTS: Mice were 3 months at the beginning of the study. TREATMENT: Animals received once daily for 3-month saline solution or flavocoxid (20 mg/kg/ip)...
February 25, 2017: Inflammation Research: Official Journal of the European Histamine Research Society ... [et Al.]
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