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https://www.readbyqxmd.com/read/28428620/formal-definitions-of-unbounded-evolution-and-innovation-reveal-universal-mechanisms-for-open-ended-evolution-in-dynamical-systems
#1
Alyssa Adams, Hector Zenil, Paul C W Davies, Sara Imari Walker
Open-ended evolution (OEE) is relevant to a variety of biological, artificial and technological systems, but has been challenging to reproduce in silico. Most theoretical efforts focus on key aspects of open-ended evolution as it appears in biology. We recast the problem as a more general one in dynamical systems theory, providing simple criteria for open-ended evolution based on two hallmark features: unbounded evolution and innovation. We define unbounded evolution as patterns that are non-repeating within the expected Poincare recurrence time of an isolated system, and innovation as trajectories not observed in isolated systems...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28425032/parenting-in-on-off-relationships-the-link-between-relationship-churning-and-father-involvement
#2
Kristin Turney, Sarah Halpern-Meekin
Family systems theory points to the interconnected nature of dyadic relationships within the family unit, arguing for attention to how the parental relationship shapes their ties to and interactions with their children. Grounded in family systems theory, we consider how relationship churning-defined as being in an on-again/off-again relationship with the same partner-is associated with father involvement. We use data from the Fragile Families and Child Wellbeing Study to examine how father involvement among relationship churners compares with father involvement among those in three other relationship types (measured during the first five years of the focal child's life): stably together relationships, stably broken-up relationships, and repartnered relationships...
April 19, 2017: Demography
https://www.readbyqxmd.com/read/28423816/a-method-for-co-designing-theory-based-behaviour-change-systems-for-health-promotion
#3
Rebecka Janols, Helena Lindgren
A methodology was defined and developed for designing theory-based behaviour change systems for health promotion that can be tailored to the individual. Theories from two research fields were combined with a participatory action research methodology. Two case studies applying the methodology were conducted. During and between group sessions the participants created material and designs following the behaviour change strategy themes, which were discussed, analysed and transformed into a design of a behaviour change system...
2017: Studies in Health Technology and Informatics
https://www.readbyqxmd.com/read/28417973/excitability-in-the-p53-network-mediates-robust-signaling-with-tunable-activation-thresholds-in-single-cells
#4
Gregor Mönke, Elena Cristiano, Ana Finzel, Dhana Friedrich, Hanspeter Herzel, Martin Falcke, Alexander Loewer
Cellular signaling systems precisely transmit information in the presence of molecular noise while retaining flexibility to accommodate the needs of individual cells. To understand design principles underlying such versatile signaling, we analyzed the response of the tumor suppressor p53 to varying levels of DNA damage in hundreds of individual cells and observed a switch between distinct signaling modes characterized by isolated pulses and sustained oscillations of p53 accumulation. Guided by dynamic systems theory we show that this requires an excitable network structure comprising positive feedback and provide experimental evidence for its molecular identity...
April 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28390495/aggression-protects-against-the-onset-of-major-depressive-episodes-in-individuals-with-bipolar-spectrum-disorder
#5
Tommy H Ng, Rachel D Freed, Madison K Titone, Jonathan P Stange, Rachel B Weiss, Lyn Y Abramson, Lauren B Alloy
A growing body of research suggests that bipolar spectrum disorders (BSDs) are associated with high aggression. However, little research has prospectively examined how aggression may affect time to onset of hypomanic/manic versus major depressive episodes. In a longitudinal study, we tested the hypothesis that aggression would prospectively predict a shorter time to the onset of hypomanic/manic episodes and a longer time to the onset of major depressive episodes, based on the behavioral approach system theory of BSDs...
May 2017: Behavior Therapy
https://www.readbyqxmd.com/read/28379556/fusing-biodiversity-metrics-into-investigations-of-daily-life-illustrations-and-recommendations-with-emodiversity
#6
Lizbeth Benson, Nilam Ram, David M Almeida, Alex J Zautra, Anthony D Ong
Objectives: Functionalist emotion and ecological systems theories suggest emodiversity-the variety and relative abundance of individuals' emotion experiences-is beneficial for psychological and physical health and may change with age. This paper examines and provides recommendations for operationalization of diversity-type intraindividual variability (IIV) constructs using intensive longitudinal data, and demonstrates the utility of emodiversity by examining its links to physical health moderated by mean levels of emotion and age...
March 30, 2017: Journals of Gerontology. Series B, Psychological Sciences and Social Sciences
https://www.readbyqxmd.com/read/28368834/asynchronous-state-estimation-for-discrete-time-switched-complex-networks-with-communication-constraints
#7
Dan Zhang, Qing-Guo Wang, Dipti Srinivasan, Hongyi Li, Li Yu
This paper is concerned with the asynchronous state estimation for a class of discrete-time switched complex networks with communication constraints. An asynchronous estimator is designed to overcome the difficulty that each node cannot access to the topology/coupling information. Also, the event-based communication, signal quantization, and the random packet dropout problems are studied due to the limited communication resource. With the help of switched system theory and by resorting to some stochastic system analysis method, a sufficient condition is proposed to guarantee the exponential stability of estimation error system in the mean-square sense and a prescribed $H∞ performance level is also ensured...
March 29, 2017: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/28355471/moving-from-static-to-dynamic-models-of-the-onset-of-mental-disorder-a-review
#8
Barnaby Nelson, Patrick D McGorry, Marieke Wichers, Johanna T W Wigman, Jessica A Hartmann
Importance: In recent years, there has been increased focus on subthreshold stages of mental disorders, with attempts to model and predict which individuals will progress to full-threshold disorder. Given this research attention and the clinical significance of the issue, this article analyzes the assumptions of the theoretical models in the field. Observations: Psychiatric research into predicting the onset of mental disorder has shown an overreliance on one-off sampling of cross-sectional data (ie, a snapshot of clinical state and other risk markers) and may benefit from taking dynamic changes into account in predictive modeling...
March 29, 2017: JAMA Psychiatry
https://www.readbyqxmd.com/read/28350236/improving-a-health-information-system-for-real-time-data-entries-an-action-research-project-using-socio-technical-systems-theory
#9
Godfried Bakiyem Adaba, Yohannes Kebebew
BACKGROUND/PURPOSE: This paper presents the findings of an action research (AR) project to improve a health information system (HIS) at the Operating Theater Department (OTD) of a National Health Service (NHS) hospital in South East England, the UK. METHODS: Informed by socio-technical systems (STS) theory, AR was used to design an intervention to enhance an existing patient administration system (PAS) to enable data entries in real time while contributing to the literature...
March 28, 2017: Informatics for Health & Social Care
https://www.readbyqxmd.com/read/28343985/functional-connectivity-dynamically-evolves-on-multiple-time-scales-over-a-static-structural-connectome-models-and-mechanisms
#10
REVIEW
Joana Cabral, Morten Kringelbach, Gustavo Deco
Over the last decade, we have observed a revolution in brain structural and functional Connectomics. On one hand, we have an ever-more detailed characterization of the brain's white matter structural connectome. On the other, we have a repertoire of consistent functional networks that form and dissipate over time during rest. Despite the evident spatial similarities between structural and functional connectivity, understanding how different time-evolving functional networks spontaneously emerge from a single structural network requires analyzing the problem from the perspective of complex network dynamics and dynamical system's theory...
March 23, 2017: NeuroImage
https://www.readbyqxmd.com/read/28340346/the-upsides-and-downsides-of-organelle-interconnectivity
#11
REVIEW
Daniel E Gottschling, Thomas Nyström
Interconnectivity and feedback control are hallmarks of biological systems. This includes communication between organelles, which allows them to function and adapt to changing cellular environments. While the specific mechanisms for all communications remain opaque, unraveling the wiring of organelle networks is critical to understand how biological systems are built and why they might collapse, as occurs in aging. A comprehensive understanding of all the routes involved in inter-organelle communication is still lacking, but important themes are beginning to emerge, primarily in budding yeast...
March 23, 2017: Cell
https://www.readbyqxmd.com/read/28318503/sociotechnical-systems-as-a-framework-for-regulatory-system-design-and-evaluation-using-work-domain-analysis-to-examine-a-new-regulatory-system
#12
Tony Carden, Natassia Goode, Gemma J M Read, Paul M Salmon
Like most work systems, the domain of adventure activities has seen a series of serious incidents and subsequent calls to improve regulation. Safety regulation systems aim to promote safety and reduce accidents. However, there is scant evidence they have led to improved safety outcomes. In fact there is some evidence that the poor integration of regulatory system components has led to adverse safety outcomes in some contexts. Despite this, there is an absence of methods for evaluating regulatory and compliance systems...
March 15, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28316578/attractor-states-in-teaching-and-learning-processes-a-study-of-out-of-school-science-education
#13
Carla H Geveke, Henderien W Steenbeek, Jeannette M Doornenbal, Paul L C Van Geert
In order for out-of-school science activities that take place during school hours but outside the school context to be successful, instructors must have sufficient pedagogical content knowledge (PCK) to guarantee high-quality teaching and learning. We argue that PCK is a quality of the instructor-pupil system that is constructed in real-time interaction. When PCK is evident in real-time interaction, we define it as Expressed Pedagogical Content Knowledge (EPCK). The aim of this study is to empirically explore whether EPCK shows a systematic pattern of variation, and if so whether the pattern occurs in recurrent and temporary stable attractor states as predicted in the complex dynamic systems theory...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28302187/dynamical-systems-theory-in-quantitative-psychology-and-cognitive-science-a-fair-discrimination-between-deterministic-and-statistical-counterparts-is-required
#14
Adam Gadomski, Marcel Ausloos, Tahlia Casey
This article addresses a set of observations framed in both deterministic as well as statistical formal guidelines. It operates within the framework of nonlinear dynamical systems theory (NDS). It is argued that statistical approaches can manifest themselves ambiguously, creating practical discrepancies in psychological and cognitive data analyses both quantitatively and qualitatively. This is sometimes termed in literature as 'questionable research practices.' This communication points to the demand for a deeper awareness of the data 'initial conditions, allowing to focus on pertinent evolution constraints in such systems...
April 2017: Nonlinear Dynamics, Psychology, and Life Sciences
https://www.readbyqxmd.com/read/28288155/dynamics-robustness-of-cascading-systems
#15
Jonathan T Young, Tetsuhiro S Hatakeyama, Kunihiko Kaneko
A most important property of biochemical systems is robustness. Static robustness, e.g., homeostasis, is the insensitivity of a state against perturbations, whereas dynamics robustness, e.g., homeorhesis, is the insensitivity of a dynamic process. In contrast to the extensively studied static robustness, dynamics robustness, i.e., how a system creates an invariant temporal profile against perturbations, is little explored despite transient dynamics being crucial for cellular fates and are reported to be robust experimentally...
March 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28283352/the-s-c-ensory-immune-system-theory
#16
REVIEW
Henrique Veiga-Fernandes, António A Freitas
Viewpoints on the immune system have evolved across different paradigms, including the clonal selection theory, the idiotypic network, and the danger and tolerance models. Herein, we propose that in multicellular organisms, where panoplies of cells from different germ layers interact and immune cells are constantly generated, the behavior of the immune system is defined by the rules governing cell survival, systems physiology and organismic homeostasis. Initially, these rules were imprinted at the single cell-protist level, but supervened modifications in the transition to multicellular organisms...
March 7, 2017: Trends in Immunology
https://www.readbyqxmd.com/read/28280580/organization-of-biogeochemical-nitrogen-pathways-with-switch-like-adjustment-in-fluctuating-soil-redox-conditions
#17
Sanjay Lamba, Soumen Bera, Mubasher Rashid, Alexander B Medvinsky, Gui-Quan Sun, Claudia Acquisti, Amit Chakraborty, Bai-Lian Li
Nitrogen is cycled throughout ecosystems by a suite of biogeochemical processes. The high complexity of the nitrogen cycle resides in an intricate interplay between reversible biochemical pathways alternatively and specifically activated in response to diverse environmental cues. Despite aggressive research, how the fundamental nitrogen biochemical processes are assembled and maintained in fluctuating soil redox conditions remains elusive. Here, we address this question using a kinetic modelling approach coupled with dynamical systems theory and microbial genomics...
January 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28277437/developing-and-implementing-a-simulated-electronic-medication-administration-record-for-undergradute-nursing-education-using-sociotechnical-systems-theory-to-inform-practice-and-curricula
#18
(no author information available yet)
No abstract text is available yet for this article.
March 2017: Computers, Informatics, Nursing: CIN
https://www.readbyqxmd.com/read/28276582/ecological-factors-in-human-development
#19
William E Cross
Urie Bronfenbrenner (1992) helped developmental psychologists comprehend and define "context" as a rich, thick multidimensional construct. His ecological systems theory consists of five layers, and within each layer are developmental processes unique to each layer. The four articles in this section limit the exploration of context to the three innermost systems: the individual plus micro- and macrolayers. Rather than examine both the physical features and processes, the articles tend to focus solely on processes associated with a niche...
March 9, 2017: Child Development
https://www.readbyqxmd.com/read/28273856/time-prediction-models-for-echinococcosis-based-on-gray-system-theory-and-epidemic-dynamics
#20
Liping Zhang, Li Wang, Yanling Zheng, Kai Wang, Xueliang Zhang, Yujian Zheng
Echinococcosis, which can seriously harm human health and animal husbandry production, has become an endemic in the Xinjiang Uygur Autonomous Region of China. In order to explore an effective human Echinococcosis forecasting model in Xinjiang, three grey models, namely, the traditional grey GM(1,1) model, the Grey-Periodic Extensional Combinatorial Model (PECGM(1,1)), and the Modified Grey Model using Fourier Series (FGM(1,1)), in addition to a multiplicative seasonal ARIMA(1,0,1)(1,1,0)₄ model, are applied in this study for short-term predictions...
March 4, 2017: International Journal of Environmental Research and Public Health
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