Diversity-induced resonance in the response to social norms

In this paper we focus on diversity-induced resonance, which was recently found in bistable, excitable, and other physical systems. We study the appearance of this phenomenon in a purely economic model of cooperating and defecting agents. An agent's contribution to a public good is seen as a social norm, so defecting agents face a social pressure, which decreases if free riding becomes widespread. In this model, diversity among agents naturally appears because of the different sensitivities towards the social norm. We study the evolution of cooperation as a response to the social norm (i) for the replicator dynamics and (ii) for the logit dynamics by means of numerical simulations. Diversity-induced resonance is observed as a maximum in the response of agents to changes in the social norm as a function of the degree of heterogeneity in the population. We provide an analytical, mean-field approach for the logit dynamics and find very good agreement with the simulations. From a socioeconomic perspective, our results show that, counterintuitively, diversity in the individual sensitivity to social norms may result in a society that better follows such norms as a whole, even if part of the population is less prone to follow themC.J.T. acknowledges financial support from Swiss National Science Foundation through grant CR12I1_125298 and SBF (Swiss Confederation) through research project C09.0055. A.S. was supported in part by grants MOSAICO and PRODIEVO (Ministerio de Ciencia e Innovación, Spain), RESINEE from ERA-Net on Complexity, and MODELICO-CM (Comunidad de Madrid, Spain). A. S. is thankful to the Chair of Systems Design at ETH Zürich for the warm hospitality enjoyed during the design of this work.Publicad

Measuring gender norms about relationships in early adolescence : results from the global early adolescent study

Introduction: Gender norms are increasingly recognized as drivers of health and wellbeing. While early adolescence constitutes a critical window of development, there is limited understanding about how adolescents perceive gender relations across different cultural settings. This study used a mixed-method approach, grounded in the voices of young people around the world, to construct and test a cross-cultural scale assessing the perceptions of gender norms regulating romantic relationships between boys and girls in early adolescence. Methods: The study draws on the Global Early Adolescent study (GEAS), a study focusing on gender norms and health related outcomes over the course of adolescence in urban poor settings worldwide. In-depth interviews were first conducted among approximately 200 adolescents between 10-14 years in seven sites across 4 continents to identify common scripts guiding romantic relations in early adolescence. These scripts were then transformed into a multidimensional scale. The scale was tested among 120 adolescents in each of 14 GEAS sites, followed by a second pilot among 75 adolescents in six sites. We evaluated the psychometric criteria of each subscale using principal component analysis, and parallel analysis, followed by exploratory factor analysis to guide the selection of a more parsimonious set of items. Results: Results suggested a two-factor structure, consisting of an "adolescent romantic expectations" subscale and a "Sexual Double Standard" subscale. Both subscales yielded high internal validity in each site, with polychoric Cronbach alpha values above 0.70 with the exception of Kinshasa for the adolescent romantic expectations scale (0.64) and Hanoi for the sexual double standard scale (0.61). Conclusion: This study reveals common perceptions of gendered norms about romantic engagement in early adolescence, normative for both sexes, but socially valued for boys while devaluated for girls. The findings illustrate that social hierarchies of power in romantic relationships form early in adolescence, regardless of cultural setting

Coevolutionary games - a mini review

Prevalence of cooperation within groups of selfish individuals is puzzling in that it contradicts with the basic premise of natural selection. Favoring players with higher fitness, the latter is key for understanding the challenges faced by cooperators when competing with defectors. Evolutionary game theory provides a competent theoretical framework for addressing the subtleties of cooperation in such situations, which are known as social dilemmas. Recent advances point towards the fact that the evolution of strategies alone may be insufficient to fully exploit the benefits offered by cooperative behavior. Indeed, while spatial structure and heterogeneity, for example, have been recognized as potent promoters of cooperation, coevolutionary rules can extend the potentials of such entities further, and even more importantly, lead to the understanding of their emergence. The introduction of coevolutionary rules to evolutionary games implies, that besides the evolution of strategies, another property may simultaneously be subject to evolution as well. Coevolutionary rules may affect the interaction network, the reproduction capability of players, their reputation, mobility or age. Here we review recent works on evolutionary games incorporating coevolutionary rules, as well as give a didactic description of potential pitfalls and misconceptions associated with the subject. In addition, we briefly outline directions for future research that we feel are promising, thereby particularly focusing on dynamical effects of coevolutionary rules on the evolution of cooperation, which are still widely open to research and thus hold promise of exciting new discoveries.Comment: 24 two-column pages, 10 figures; accepted for publication in BioSystem

Rade, Development, and the Broken Promise of Interdependence: A Buddhist Reflection on the Possibility of Post-market Economics

Bhutan's stated intention of keeping the value of happiness central to the development process is a suitable counter to the values and karma that prevail in most development strategies and ideals. Given present day realities of unprecedented, accelerating changes and paradigmatic shifts in economic, political, and social practices, any successful strategy for integration into global development processes must be creative in nature. It must, in other words, consist of an ongoing improvisation that is at once virtuosic and virtuous and that brings both greater resolution and resolve into the development process. In this essay the author wants to contribute to this effort by considering the broad landscape of development and trade concepts and practices and their implications for the trajectory of innovations needed to insure that development processes and greater economic interdependence are, indeed, liberating. The auhtor starts by reflecting on the context of present day patterns of development, raising some issues related to history and scale in assessing the effects of increasing global interdependence. He suggestes that present day patterns and scales of globalization have both generated and been generated by the extremely rapid and practically irreversible commodification of subsistence needs—a commodification that (paraphrasing Ivan Illich) has the effect of institutionalizing entirely new classes of the poor. Beyond a critical threshold and unless redirected—that is, informed by radically different values—present day patterns of interdependence will continue bringing about the conversion of communities that have been faring well into aggregates of individuals in need of welfare. Unchecked, the promise of globally extended, deep community will be broken

The interplay between diversity and noise in an excitable cell network model

We study the interplay between diversity and noise in a 3D network of FitzHugh-Nagumo elements, with topology and dimensions chosen to model a pancreatic beta-cell cluster, as an example of an excitable cell network. Our results show that diversity and noise are not equivalent sources of disorder but have different effects on network dynamics. Their synchronization mechanisms may act independently of one another or synergistically, depending on the mean value of the diversity distribution compared to the intrinsic oscillatory range of the network elements.Comment: 7 pages, 5 figure

Testing Behavioral Public Economics Theories in the Laboratory

"Behavioral economics", or the application of methods and evidence from other social sciences to economics, has increased greatly in significance in the last two decades. An important method by which many of its predictions have been tested has been via laboratory experiments. In this paper I survey and assess experimental tests of various applications of behavioral economics to the specific area of public economics, or "behavioral public economics". I discuss the basic elements of behavioral economics, the methodology of experimental economics, applications of experimental methods to behavioral public economics, and topics in which future applications should prove useful.experimental methods, behavioral economics

Capacity and tendency: A neuroscientific framework for the study of emotion regulation.

It is widely accepted that the ability to effectively regulate one's emotions is a cornerstone of physical and mental health. As such, it should come as no surprise that the number of neuroimaging studies focused on emotion regulation and associated processes has increased exponentially in the past decade. To date, neuroimaging research on this topic has examined two distinct but complementary features of emotion regulation - the capacity to effectively utilize a strategy to regulate emotion and to a lesser extent, the tendency to choose to regulate. However, theoretical accounts of emotion regulation have only recently begun to distinguish capacity from tendency. In the present review, we provide a novel framework for conceptualizing these two intertwined, yet distinct, facets of emotion regulation. First we characterize brain regions that support emotion generation and are thus targeted by emotion regulation. Next, we synthesize findings from the dozens of neuroimaging studies that have examined emotion regulation capacity, focusing in particular on the most commonly studied emotion regulation strategy - reappraisal. Finally, we discuss emerging neuroimaging research examining state and trait regulatory tendencies. We conclude by integrating findings from neuroimaging research on emotion regulation capacity and tendency and suggest ways that this integrated model can inform basic and translational neuroscientific research on emotion regulation