Dynamical affinity in opinion dynamics modelling

We here propose a model to simulate the process of opinion formation, which accounts for the mutual affinity between interacting agents. Opinion and affinity evolve self-consistently, manifesting a highly non trivial interplay. A continuous transition is found between single and multiple opinion states. Fractal dimension and signature of critical behaviour are also reported. A rich phenomenology is presented and discussed with reference to corresponding psychological implications

The social basis of emotion: affective consequences of social comparisons with competitive and cooperative others

The present research explores the affective consequences of social comparisons made by cooperators and competitors. Participants (75 males, 90 females) were randomly assigned to either a cooperative or competitive condition in which they either performed better or worse than a partner. Participants were asked to imagine themselves in a particular situation and then report their emotional reaction to the scenario. Consistent with R. Lazarus\u27 cognitive appraisal theory of emotion, participants in the cooperative condition reported anger when their partner\u27s actions hindered goal attainment but reported joy when the partner promoted goal attainment. Consistent with T. Wills\u27 theory of downward social comparison, participants reported joy when they performed better than a competitor. In accordance with some aspects of L. Festinger\u27s theory of upward social comparison, participants reported anger when they performed worse than a competitor. Implications for reward distribution practices in organizational settings are discussed

Polarization of coalitions in an agent-based model of political discourse

Political discourse is the verbal interaction between political actors in a policy domain. This article explains the formation of polarized advocacy or discourse coalitions in this complex phenomenon by presenting a dynamic, stochastic, and discrete agent-based model based on graph theory and local optimization. In a series of thought experiments, actors compute their utility of contributing a specific statement to the discourse by following ideological criteria, preferential attachment, agenda-setting strategies, governmental coherence, or other mechanisms. The evolving macro-level discourse is represented as a dynamic network and evaluated against arguments from the literature on the policy process. A simple combination of four theoretical mechanisms is already able to produce artificial policy debates with theoretically plausible properties. Any sufficiently realistic configuration must entail innovative and path-dependent elements as well as a blend of exogenous preferences and endogenous opinion formation mechanisms

A feasibility trial to examine the social norms approach for the prevention and reduction of licit and illicit drug use in European University and college students.

Background: Incorrect perceptions of high rates of peer alcohol and tobacco use are predictive of increased personal use in student populations. Correcting misperceptions by providing feedback has been shown to be an effective intervention for reducing licit drug use. It is currently unknown if social norms interventions are effective in preventing and reducing illicit drug use in European students. The purpose of this paper is to describe the design of a multi-site cluster controlled trial of a web-based social norms intervention aimed at reducing licit and preventing illicit drug use in European university students. Methods/Design: An online questionnaire to assess rates of drug use will be developed and translated based on existing social norms surveys. Students from sixteen universities in seven participating European countries will be invited to complete the questionnaire. Both intervention and control sites will be chosen by convenience. In each country, the intervention site will be the university that the local principal investigator is affiliated with. We aim to recruit 1000 students per site (baseline assessment). All participants will complete the online questionnaire at baseline. Baseline data will be used to develop social norms messages that will be included in a web-based intervention. The intervention group will receive individualized social norms feedback. The website will remain online during the following 5 months. After five months, a second survey will be conducted and effects of the intervention on social norms and drug use will be measured in comparison to the control site. Discussion: This project is the first cross-national European collaboration to investigate the feasibility of a social norms intervention to reduce licit and prevent illicit drug use among European university students. Final trial registration number DRKS00004375 on the ‘German Clinical Trials Register’.This study is funded by the European Commission, Directorate General Justice, Freedom and Security (JLS/2009-2010/DPIP/AG

SOME APPROACHES TO THE EXPERIMENTAL METHOD IN THE SCIENTIFIC ECONOMIC RESEARCH

Used on a wide scale in the natural sciences, the experimental method was accepted and used in the research field of the economic sciences much later and with a lot of restraint. Although the application of the experiment in the field of the economic sciences implies a lot of real problems, the experimental method is, today, a proceeding used in the scientific economic investigations, having an important role both in verification and demonstration of the causal hypothesis and in the improvement and development of the field through the identification, detection of some new data regarding the examined phenomenon.economic science, economic investigations, research methods