Aktuelle Publikationen

We study the changes in emotional states induced by reading and participating in online discussions, empirically testing a computational model of online emotional interaction. Using principles of dynamical systems, we quantify changes in valence and arousal through subjective reports, as recorded in three independent studies including 207 participants (110 female). In the context of online discussions, the dynamics of valence and arousal are composed of two forces: an internal relaxation towards baseline values independent of the emotional charge of the discussion, and a driving force of emotional states that depends on the content of the discussion. The dynamics of valence show the existence of positive and negative tendencies, while arousal increases when reading emotional content regardless of its polarity. The tendency of participants to take part in the discussion increases with positive arousal. When participating in an online discussion, the content of participants' expression depends on their valence, and their arousal significantly decreases afterwards as a regulation mechanism. We illustrate how these results allow the design of agent-based models to reproduce and analyze emotions in online communities. Our work empirically validates the microdynamics of a model of online collective emotions, bridging online data analysis with research in the laboratory.

Contributing to the writing of history has never been as easy as it is today thanks to Wikipedia, a community-created encyclopedia that aims to document the world’s knowledge from a neutral point of view. Though everyone can participate it is well known that the editor community has a narrow diversity, with a majority of white male editors. While this participatory gender gap has been studied extensively in the literature, this work sets out to assess potential gender inequalities in Wikipedia articles along different dimensions: notability, topical focus, linguistic bias, structural properties, and meta-data presentation.

We find that (i) women in Wikipedia are more notable than men, which we interpret as the outcome of a subtle glass ceiling effect; (ii) family-, gender-, and relationship-related topics are more present in biographies about women; (iii) linguistic bias manifests in Wikipedia since abstract terms tend to be used to describe positive aspects in the biographies of men and negative aspects in the biographies of women; and (iv) there are structural differences in terms of meta-data and hyperlinks, which have consequences for information-seeking activities. While some differences are expected, due to historical and social contexts, other differences are attributable to Wikipedia editors. The implications of such differences are discussed having Wikipedia contribution policies in mind. We hope that the present work will contribute to increased awareness about, first, gender issues in the content of Wikipedia, and second, the different levels on which gender biases can manifest on the Web.

The Internet and social media have become increasingly important for children today, as they seek information, friends, and social support online. Social media is also home for communities that may advocate unhealthy behavior. Proanorexia (proana) and probulimia sites and online communities are publicly available; they are interactive and promote “thinspiration” (“inspirational” pictures of extremely thin bodies).1 Such material is easy to access, and some children might find it by accident. According to a 25-country EU Kids Online survey, for example, 10% of children aged 9 to 16 had seen eating disorder sites online, with girls being more commonly exposed to such material than boys.2 With the rapid expansion of social media, proana and other harmful online communities have a global audience. Proana communities are active on different social media sites, including Facebook, YouTube, Twitter, Instagram, Pinterest, Flickr, and Snapchat.

Die Automotive-Branche steht unter Innovationsdruck. Führungskräfte spielen eine entscheidende Rolle, wenn es darum geht, Mitarbeiter im Umfeld von radikalem Wandel zu motivieren und zu begleiten. Mitarbeiterbefragungen und Führungskräfte-Workshops können hierfür Grundlagen legen. Ein Praxisbeispiel.

The contribution of this paper is to describe how we can program neuroimaging workflow using Make, a software development tool designed for describing how to build executables from source files. A makefile (or a file of instructions for Make) consists of a set of rules that create or update target files if they have not been modified since their dependencies were last modified. These rules are processed to create a directed acyclic dependency graph that allows multiple entry points from which to execute the workflow. We show that using Make we can achieve many of the features of more sophisticated neuroimaging pipeline systems, including reproducibility, parallelization, fault tolerance, and quality assurance reports. We suggest that Make permits a large step toward these features with only a modest increase in programming demands over shell scripts. This approach reduces the technical skill and time required to write, debug, and maintain neuroimaging workflows in a dynamic environment, where pipelines are often modified to accommodate new best practices or to study the effect of alternative preprocessing steps, and where the underlying packages change frequently. This paper has a comprehensive accompanying manual with lab practicals and examples (see Supplemental Materials) and all data, scripts, and makefiles necessary to run the practicals and examples are available in the "makepipelines" project at NITRC.

Already on its introduction into the international business literature, the concept of ‘psychic distance’ implied asymmetry in the distance perceptions between country pairs, a characteristic corroborated in subsequent empirical studies. However, predominant empirical operationalizations and their theoretical underpinnings assume psychic distances to be symmetric. Building on insights from psychology and sociology, this paper demonstrates how national factors and cognitive processes interact in the formation of asymmetric distance perceptions. The results suggest that exposure to other countries through emigrants and imports of cultural goods and services have asymmetric effects on psychic distance perceptions. The size of these effects appears to vary with the size of the home country – smaller countries tend, on average, to perceive psychic distances to the rest of the world as smaller than do bigger ones. The reputational status of target countries relative to that of the home country is found to have a non-linear, asymmetric effect on distance perceptions.

Deciding on arms exports is a delicate matter in western democracies. Potential economic and security gains have to be weighed against normative and security concerns. This article explores how this tension is solved in Germany, a country that holds strong moral aspirations but at the same time lists among the top arms exporting nations worldwide. Using a newly compiled dataset, we quantitatively analyse German exports of major conventional weapons (MCWs) from 1992 to 2013. Our statistical findings do not support the claim that the human rights situation in recipient countries plays an important role for German arms export decisions. Our two-stage model therefore supports a trading state rather than civilian power reading of Germany, at least when it comes to arms export practices.

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dc.contributor.author: Bergmann, Henning; Bailer, Stefanie; Ohmura, Tamaki; Saalfeld, Thomas

The impact of natural resources on intrastate violence has been increasingly analyzed in the peace and conflict literature. Surprisingly, little quantitative evidence has been gathered on the effects of the resource-ownership structure on internal violence. This paper uses a novel dataset on oil and natural gas property rights covering 40 countries during the period 1989–2010. The results of regression analyses employing logit models reveal that the curvilinear effect between hydrocarbon production and civil conflict onset—often found in previous studies—only applies to countries in which oil and gas is extracted by state-owned companies. The findings suggest that only state-controlled hydrocarbon production might entail peace-buying mechanisms such as specific clientelistic practices, patronage networks, welfare policies, and/or coercion. At the same time, it seems that greed and grievance are more pronounced whenever resources lie in the hands of the state. Exploring the within-country variation, further analyses reveal that divergent welfare spending patterns are likely to be one causal channel driving the relationship between resource ownership and internal violence.