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Peter Dayan

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https://www.readbyqxmd.com/read/28472343/maturation-in-serum-thyroid-function-parameters-over-childhood-and-puberty-results-of-a-longitudinal-study
#1
Peter N Taylor, Adrian Sayers, Onyebuchi Okosieme, Gautam Das, Mohd S Draman, Arshiya Tabasum, Hussam Abusahmin, Mohammad Rahman, Kirsty Stevenson, Alix Groom, Kate Northstone, Wolf Woltersdorf, Andrew Taylor, Susan Ring, John H Lazarus, John W Gregory, Aled Rees, Nicholas Timpson, Colin M Dayan
Context: Serum thyroid hormone levels differ between children and adults, but have not been studied longitudinally in the same individuals through childhood. Objective: To assess changes in thyroid stimulating hormone (TSH) and thyroid hormone levels over childhood and their inter-relationships. Design: Cohort study. Setting: The Avon Longitudinal Study of Parents and Children a population-based birth cohort. Participants: 4,442 children who had thyroid function measured at age 7, and 1,263 children who had thyroid function measured at age 15...
May 1, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28459442/moral-transgressions-corrupt-neural-representations-of-value
#2
Molly J Crockett, Jenifer Z Siegel, Zeb Kurth-Nelson, Peter Dayan, Raymond J Dolan
Moral systems universally prohibit harming others for personal gain. However, we know little about how such principles guide moral behavior. Using a task that assesses the financial cost participants ascribe to harming others versus themselves, we probed the relationship between moral behavior and neural representations of profit and pain. Most participants displayed moral preferences, placing a higher cost on harming others than themselves. Moral preferences correlated with neural responses to profit, where participants with stronger moral preferences had lower dorsal striatal responses to profit gained from harming others...
May 1, 2017: Nature Neuroscience
https://www.readbyqxmd.com/read/28403139/increased-decision-thresholds-enhance-information-gathering-performance-in-juvenile-obsessive-compulsive-disorder-ocd
#3
Tobias U Hauser, Michael Moutoussis, Reto Iannaccone, Silvia Brem, Susanne Walitza, Renate Drechsler, Peter Dayan, Raymond J Dolan
Patients with obsessive-compulsive disorder (OCD) can be described as cautious and hesitant, manifesting an excessive indecisiveness that hinders efficient decision making. However, excess caution in decision making may also lead to better performance in specific situations where the cost of extended deliberation is small. We compared 16 juvenile OCD patients with 16 matched healthy controls whilst they performed a sequential information gathering task under different external cost conditions. We found that patients with OCD outperformed healthy controls, winning significantly more points...
April 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28360419/algorithms-for-survival-a-comparative-perspective-on-emotions
#4
REVIEW
Dominik R Bach, Peter Dayan
The nature and neural implementation of emotions is the subject of vigorous debate. Here, we use Bayesian decision theory to address key complexities in this field and conceptualize emotions in terms of their relationship to survival-relevant behavioural choices. Decision theory indicates which behaviours are optimal in a given situation; however, the calculations required are radically intractable. We therefore conjecture that the brain uses a range of pre-programmed algorithms that provide approximate solutions...
May 2017: Nature Reviews. Neuroscience
https://www.readbyqxmd.com/read/28343697/modeling-avoidance-in-mood-and-anxiety-disorders-using-reinforcement-learning
#5
Anahit Mkrtchian, Jessica Aylward, Peter Dayan, Jonathan P Roiser, Oliver J Robinson
BACKGROUND: Serious and debilitating symptoms of anxiety are the most common mental health problem worldwide, accounting for around 5% of all adult years lived with disability in the developed world. Avoidance behavior-avoiding social situations for fear of embarrassment, for instance-is a core feature of such anxiety. However, as for many other psychiatric symptoms the biological mechanisms underlying avoidance remain unclear. METHODS: Reinforcement learning models provide formal and testable characterizations of the mechanisms of decision making; here, we examine avoidance in these terms...
February 8, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/28341799/use-of-traumatic-brain-injury-prediction-rules-with-clinical-decision-support
#6
Peter S Dayan, Dustin W Ballard, Eric Tham, Jeff M Hoffman, Marguerite Swietlik, Sara J Deakyne, Evaline A Alessandrini, Leah Tzimenatos, Lalit Bajaj, David R Vinson, Dustin G Mark, Steve R Offerman, Uli K Chettipally, Marilyn D Paterno, Molly H Schaeffer, Jun Wang, T Charles Casper, Howard S Goldberg, Robert W Grundmeier, Nathan Kuppermann
OBJECTIVES: We determined whether implementing the Pediatric Emergency Care Applied Research Network (PECARN) traumatic brain injury (TBI) prediction rules and providing risks of clinically important TBIs (ciTBIs) with computerized clinical decision support (CDS) reduces computed tomography (CT) use for children with minor head trauma. METHODS: Nonrandomized trial with concurrent controls at 5 pediatric emergency departments (PEDs) and 8 general EDs (GEDs) between November 2011 and June 2014...
March 24, 2017: Pediatrics
https://www.readbyqxmd.com/read/28240922/formalizing-neurath-s-ship-approximate-algorithms-for-online-causal-learning
#7
Neil R Bramley, Peter Dayan, Thomas L Griffiths, David A Lagnado
Higher-level cognition depends on the ability to learn models of the world. We can characterize this at the computational level as a structure-learning problem with the goal of best identifying the prevailing causal relationships among a set of relata. However, the computational cost of performing exact Bayesian inference over causal models grows rapidly as the number of relata increases. This implies that the cognitive processes underlying causal learning must be substantially approximate. A powerful class of approximations that focuses on the sequential absorption of successive inputs is captured by the Neurath's ship metaphor in philosophy of science, where theory change is cast as a stochastic and gradual process shaped as much by people's limited willingness to abandon their current theory when considering alternatives as by the ground truth they hope to approach...
April 2017: Psychological Review
https://www.readbyqxmd.com/read/28216315/landmarks-in-existing-tissue-at-wounds-are-utilized-to-generate-pattern-in-regenerating-tissue
#8
Isaac M Oderberg, Dayan J Li, M Lucila Scimone, Michael A Gaviño, Peter W Reddien
Regeneration in many organisms involves the formation of a blastema, which differentiates and organizes into the appropriate missing tissues. How blastema pattern is generated and integrated with pre-existing tissues is a central question in the field of regeneration. Planarians are free-living flatworms capable of rapidly regenerating from small body fragments [1]. A cell cluster at the anterior tip of planarian head blastemas (the anterior pole) is required for anterior-posterior (AP) and medial-lateral (ML) blastema patterning [2-4]...
March 6, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28173888/current-state-of-antimicrobial-stewardship-in-children-s-hospital-emergency-departments
#9
Rakesh D Mistry, Jason G Newland, Jeffrey S Gerber, Adam L Hersh, Larissa May, Sarah M Perman, Nathan Kuppermann, Peter S Dayan
BACKGROUND Antimicrobial stewardship programs (ASPs) effectively optimize antibiotic use for inpatients; however, the extent of emergency department (ED) involvement in ASPs has not been described. OBJECTIVE To determine current ED involvement in children's hospital ASPs and to assess beliefs and preferred methods of implementation for ED-based ASPs. METHODS A cross-sectional survey of 37 children's hospitals participating in the Sharing Antimicrobial Resistance Practices collaboration was conducted. Surveys were distributed to ASP leaders and ED medical directors at each institution...
February 8, 2017: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/28170143/prevalence-of-brain-injuries-and-recurrence-of-seizures-in-children-with-posttraumatic-seizures
#10
Mohamed K Badawy, Peter S Dayan, Michael G Tunik, Frances M Nadel, Kathleen A Lillis, Michelle Miskin, Dominic A Borgialli, Michael C Bachman, Shireen M Atabaki, John D Hoyle, James F Holmes, Nathan Kuppermann
OBJECTIVES: Computed tomography (CT) is often used in the emergency department (ED) evaluation of children with posttraumatic seizures (PTS); however, the frequency of traumatic brain injuries (TBIs) and short-term seizure recurrence is lacking. Our main objective was to evaluate the frequency of TBIs on CT and short-term seizure recurrence in children with PTS. We also aimed to determine the associations between the likelihood of TBI on CT with the timing of onset of PTS after the traumatic event and duration of PTS...
May 2017: Academic Emergency Medicine: Official Journal of the Society for Academic Emergency Medicine
https://www.readbyqxmd.com/read/28101493/an-invitation-to-join-the-consortium-on-thyroid-and-pregnancy
#11
Tim I M Korevaar, Peter N Taylor, Colin M Dayan, Robin Patrick Peeters
No abstract text is available yet for this article.
December 2016: European Thyroid Journal
https://www.readbyqxmd.com/read/27993819/parsing-the-role-of-the-hippocampus-in-approach-avoidance-conflict
#12
Eleanor Loh, Zeb Kurth-Nelson, David Berron, Peter Dayan, Emrah Duzel, Ray Dolan, Marc Guitart-Masip
The hippocampus plays a central role in the approach-avoidance conflict that is central to the genesis of anxiety. However, its exact functional contribution has yet to be identified. We designed a novel gambling task that generated approach-avoidance conflict while controlling for spatial processing. We fit subjects' behavior using a model that quantified the subjective values of choice options, and recorded neural signals using functional magnetic resonance imaging (fMRI). Distinct functional signals were observed in anterior hippocampus, with inferior hippocampus selectively recruited when subjects rejected a gamble, to a degree that covaried with individual differences in anxiety...
January 1, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/27941965/cd4-cd8-ratio-and-kt-ratio-predict-yellow-fever-vaccine-immunogenicity-in-hiv-infected-patients
#13
Vivian I Avelino-Silva, Karina T Miyaji, Peter W Hunt, Yong Huang, Marisol Simoes, Sheila B Lima, Marcos S Freire, Helio H Caiaffa-Filho, Marisa A Hong, Dayane Alves Costa, Juliana Zanatta C Dias, Natalia B Cerqueira, Anna Shoko Nishiya, Ester Cerdeira Sabino, Ana M Sartori, Esper G Kallas
BACKGROUND: HIV-infected individuals have deficient responses to Yellow Fever vaccine (YFV) and may be at higher risk for adverse events (AE). Chronic immune activation-characterized by low CD4/CD8 ratio or high indoleamine 2,3-dioxygenase-1 (IDO) activity-may influence vaccine response in this population. METHODS: We prospectively assessed AE, viremia by the YFV virus and YF-specific neutralizing antibodies (NAb) in HIV-infected (CD4>350) and -uninfected adults through 1 year after vaccination...
December 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27930904/computations-underlying-social-hierarchy-learning-distinct-neural-mechanisms-for-updating-and-representing-self-relevant-information
#14
Dharshan Kumaran, Andrea Banino, Charles Blundell, Demis Hassabis, Peter Dayan
Knowledge about social hierarchies organizes human behavior, yet we understand little about the underlying computations. Here we show that a Bayesian inference scheme, which tracks the power of individuals, better captures behavioral and neural data compared with a reinforcement learning model inspired by rating systems used in games such as chess. We provide evidence that the medial prefrontal cortex (MPFC) selectively mediates the updating of knowledge about one's own hierarchy, as opposed to that of another individual, a process that underpinned successful performance and involved functional interactions with the amygdala and hippocampus...
December 7, 2016: Neuron
https://www.readbyqxmd.com/read/27898635/mobile-health-technology-to-communicate-discharge-and-follow-up-information-to-adolescents-from-the-emergency-department
#15
Margaret Ray, Peter S Dayan, Vartan Pahalyants, Lauren S Chernick
OBJECTIVE: Adolescents are the largest users of mobile technology; yet, there are little data regarding their receptivity to the use of mobile health technology (mHealth) from the emergency department (ED). The objective of this study was to determine adolescents' preferences for receiving ED discharge and follow-up information via mHealth and factors associated with those preferences. METHODS: We administered an anonymous self-reporting survey to patients aged 14 to 19 years discharged from an urban pediatric ED...
December 2016: Pediatric Emergency Care
https://www.readbyqxmd.com/read/27890780/a-clinical-score-to-predict-appendicitis-in-older-male-children
#16
Anupam B Kharbanda, Michael C Monuteaux, Richard G Bachur, Nanette C Dudley, Lalit Bajaj, Michelle D Stevenson, Charles G Macias, Manoj K Mittal, Jonathan E Bennett, Kelly Sinclair, Peter S Dayan
OBJECTIVE: To develop a clinical score to predict appendicitis among older, male children who present to the emergency department with suspected appendicitis. METHODS: Patients with suspected appendicitis were prospectively enrolled at 9 pediatric emergency departments. A total of 2625 patients enrolled; a subset of 961 male patients, age 8-18 were analyzed in this secondary analysis. Outcomes were determined using pathology, operative reports, and follow-up calls...
April 2017: Academic Pediatrics
https://www.readbyqxmd.com/read/27888148/a-pilot-study-of-a-multimodal-treatment-paradigm-to-accelerate-drug-evaluations-in-early-stage-metastatic-prostate-cancer
#17
Matthew J O'Shaughnessy, Sean M McBride, Hebert Alberto Vargas, Karim A Touijer, Michael J Morris, Daniel C Danila, Vincent P Laudone, Bernard H Bochner, Joel Sheinfeld, Erica S Dayan, Lawrence P Bellomo, Daniel D Sjoberg, Glenn Heller, Michael J Zelefsky, James A Eastham, Peter T Scardino, Howard I Scher
OBJECTIVE: To evaluate a multimodal strategy aimed at treating all sites of disease that provides a rapid readout of success or failure in men presenting with non-castrate metastatic prostate cancers that are incurable with single modality therapy. MATERIALS AND METHODS: Twenty selected men with oligometastatic M1a (extrapelvic nodal disease) or M1b (bone disease) at diagnosis were treated using a multimodal approach that included androgen deprivation, radical prostatectomy plus pelvic lymphadenectomy (retroperitoneal lymphadenectomy in the presence of clinically positive retroperitoneal nodes), and stereotactic body radiotherapy to osseous disease or the primary site...
April 2017: Urology
https://www.readbyqxmd.com/read/27846219/pharmacological-fingerprints-of-contextual-uncertainty
#18
Louise Marshall, Christoph Mathys, Diane Ruge, Archy O de Berker, Peter Dayan, Klaas E Stephan, Sven Bestmann
Successful interaction with the environment requires flexible updating of our beliefs about the world. By estimating the likelihood of future events, it is possible to prepare appropriate actions in advance and execute fast, accurate motor responses. According to theoretical proposals, agents track the variability arising from changing environments by computing various forms of uncertainty. Several neuromodulators have been linked to uncertainty signalling, but comprehensive empirical characterisation of their relative contributions to perceptual belief updating, and to the selection of motor responses, is lacking...
November 2016: PLoS Biology
https://www.readbyqxmd.com/read/27829142/sensory-conflict-disrupts-activity-of-the-drosophila-circadian-network
#19
Ross E F Harper, Peter Dayan, Joerg T Albert, Ralf Stanewsky
Periodic changes in light and temperature synchronize the Drosophila circadian clock, but the question of how the fly brain integrates these two input pathways to set circadian time remains unanswered. We explore multisensory cue combination by testing the resilience of the circadian network to conflicting environmental inputs. We show that misaligned light and temperature cycles can lead to dramatic changes in the daily locomotor activities of wild-type flies during and after exposure to sensory conflict...
November 8, 2016: Cell Reports
https://www.readbyqxmd.com/read/27829041/cognitive-bias-in-ambiguity-judgements-using-computational-models-to-dissect-the-effects-of-mild-mood-manipulation-in-humans
#20
Kiyohito Iigaya, Aurelie Jolivald, Wittawat Jitkrittum, Iain D Gilchrist, Peter Dayan, Elizabeth Paul, Michael Mendl
Positive and negative moods can be treated as prior expectations over future delivery of rewards and punishments. This provides an inferential foundation for the cognitive (judgement) bias task, now widely-used for assessing affective states in non-human animals. In the task, information about affect is extracted from the optimistic or pessimistic manner in which participants resolve ambiguities in sensory input. Here, we report a novel variant of the task aimed at dissecting the effects of affect manipulations on perceptual and value computations for decision-making under ambiguity in humans...
2016: PloS One
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