Social identity describes the part of an individuals sense of self that is derived from their perceived association with a social group. A key mechanism for social identity driven choice stems from the normative prescriptions associated with the identity. While social identity models have given rise to a rich set of empirical work, up until this point the norms associated with different social ...

In this paper, we propose an unifying view of several recently proposed structured sparsityinducing norms. We consider the situation of a model simultaneously (a) penalized by a setfunction defined on the support of the unknown parameter vector which represents prior knowledge on supports, and (b) regularized in `p-norm. We show that the natural combinatorial optimization problems obtained may ...

In college level chemistry courses, reasoning using molecular and particulate descriptions of matter becomes central to understanding physical and chemical properties. In this study, we used a qualitative approach to analyzing classroom discourse derived from Toulmin’s model of argumentation in order to describe the ways in which students develop particulate-level justifications for claims abou...

In multi-agent systems norms are an important influence that can engender cooperation by constraining actions and binding groups together. A key question is how to establish a suitable set of norms in a decentralised population of self-interested agents, especially where individual agents might not adhere to the rules of the system. In this paper we investigate the problem of norm emergence, an...

This study investigates whether exposure to music videos predicts adolescents' sexual attitudes when controlled for relevant characteristics of individuals and their social environment. Sexual attitudes are related to their music video use (i.e. exposure to music videos, peer group talk about music videos, and perceived realism of these videos), personal factors and the sexual norms they percei...

Can the media reduce intergroup prejudice and conflict? Despite the high stakes of this question, understanding of the mass media’s role in shaping prejudiced beliefs, norms, and behavior is limited. A yearlong field experiment in Rwanda tested the impact of a radio soap opera featuring messages about reducing intergroup prejudice, violence, and trauma in 2 fictional Rwandan communities. Compar...

Can the media reduce intergroup prejudice and conflict? Despite the high stakes of this question, understanding of the mass media's role in shaping prejudiced beliefs, norms, and behavior is limited. A yearlong field experiment in Rwanda tested the impact of a radio soap opera featuring messages about reducing intergroup prejudice, violence, and trauma in 2 fictional Rwandan communities. Compar...

Although a number of studies demonstrate the impact of perceived norms on human behavior, we know little about how this relation works. Extant normsbased campaigns to reduce alcohol consumption among U.S. college students fail to distinguish between descriptive and injunctive norms. In this article, we make this distinction, and we develop a model of normative influences that also includes the ...

Online communities such as newsgroups and mailinglists are constructed around a common interest and a shared set of norms that regulates communication. These communicative norms can be studied either by observing the communicative practice of the participants or by analyzing what group members say about correct and appropriate behavior in that community (referred to as metacommunication). This ...

Our study examines two models of helping behavior in work groups. Our first model is a crosslevel model and predicts that group-level cohesion, cooperative norms, and task conflict are related to individual helping behavior (peer-rated). Results support our hypotheses and further demonstrate that of the three group characteristics, cooperative norms have the strongest relationship with individu...