A case of behavioral heterosis in mice: quantitative and qualitative aspects of performance in a water-escape task.

Fourteen hundred and four mice from two inbred strains (Balb/c and C57BL/6), F1, F2, and backcrosses were subjected to four trials in a water-escape task and to a swimming test. Detailed analysis of mice behavior in these situations showed that the "F1 hybrid vigor" affected behavioral characters not directly related to physical vigor but of potential adaptive value. Their superiority was mainly due to more frequent adoption of an efficient behavioral tactic (direct or edge escape paths toward the exit) and more rapid progress with experience in this respect than other generations exhibited. These results clearly show that heterosis is not limited to physical vigor but may extend to behavioral and even psychological characters.     

THE POST-METROPOLIS IS GOD: Notes for a Phenomenology of the Urban Spirit

Topoi - More akin to the Roman Empire’s concept of civitas mobilis augescens, the distinction between the twentieth-century metropolis and the Roman model of a city must be sought in the...     

Self-harming behaviours of asylum seekers and refugees in Europe: A systematic review

The increasing number of asylum seekers and refugees in Europe calls for even more professionals to take care of refugees' mental health. Although different studies claim that migration could be a potential risk factor for self-harming behaviours, an in-depth exploration of the presence and characteristics of self-harm in the context of asylum is needed. In accordance with PRISMA guidelines, a systematic review was conducted across the databases Scopus, PubMed, Web of Knowledge and PsycArticles, regarding the main features of self-harming behaviour among refugees in Europe. Twelve articles and 3 main trajectories were identified: (1) A context at-risk: self-harm and detention centres; (2) A target at-risk: self-harm and unaccompanied minors; (3) A comparison between the mental health of asylum seekers and natives. Research on this topic in Europe is still underdeveloped and disorganised. Studies have mainly carried out wider quantitative investigations on mental health, usually overlapping self-harm with suicide. Detention centres emerged as the most widely investigated context and the one with the highest risk for self-harming behaviours. Instead, unaccompanied minors emerged as a particularly vulnerable category. Research in this field should be improved, combining quantitative and qualitative methods for a deeper understanding of the meanings of self-harm across cultures.     

Linking servant leadership to positive deviant behavior: The mediating role of self-determination theory

How can servant leadership focused primarily on developing employees help them to become more ethical and prosocial, and to achieve positive results reaching beyond mere compliance with their tasks? More specifically, we propose that servant leadership may influence employees to engage in positive deviant behavior (PDB), meaning non-conforming behavior that is positive and ethical. Using self-determination theory (SDT), our research examines the effect of perceived servant leadership on the adoption of PDB by employees, mediated by basic psychological needs satisfaction and intrinsic motivation. To this end, we conducted a quantitative study of 344 French employees’ answers to an online survey. Structural equation modeling results indicated that the relationship between perceived servant leadership and innovative PDB is strongly predicted by SDT. Intrinsic motivation mediates the relationship between perceived servant leadership, satisfaction of basic psychological needs, and innovative PDB. Several limitations and implications will be discussed.     

Making the planet green again: The interplay of attitudes and group norms in the conversion to organic farming

Attitudes and social norms are key social psychological concepts that have often been considered as independent determinants of human behavior. However, questions about the interplay between the two are somewhat of a blind spot in social psychology. In the present research, we test the hypothesis that when an important change in norms is involved, behavioral intentions will be shaped by a discrepancy between personal attitudes and the perceived group norm, that is the perception of other group members’ attitudes. This proposition is tested and supported across three studies in a context of the conversion to organic farming, a behavior indicative of a significant societal and behavioral change. Farmers who did convert to organic farming were those who perceive other farmers to hold less positive attitudes toward this environmentally-friendly practice compared to their own (Study 1a & 1b, N = 1,023). Among conventional farmers, the intention to convert to organic farming is also predicted by a discrepancy between personal attitudes and the perceived group norm (Study 1b). Finally, among agricultural colleges’ students (Study 2, N = 280), the intention to become an organic farmer was influenced by an interaction between attitudes and perceived group norm and not only by independent effects of these two variables. The theoretical and practical implications of these findings for a better understanding of behavioral adaptation in times of social change are discussed.     

Mediators of Neighborhood Influences on Externalizing Behavior in Preadolescent Children

This study tested a mediation model of neighborhood influences on children’s externalizing behavior. In the proposed model, neighborhood disadvantage, ethnic heterogeneity, and low residential stability affect children’s behavior indirectly through their impact on neighborhood social processes, which in turn influence parenting and deviant peer affiliations. A community sample of 704 preadolescents (76% African American, 22% Caucasian) and their parents and teachers provided information for the study. Neighborhood concentrated poverty, derived from the 2000 U.S. Census, was positively associated with children’s externalizing behavior. This effect was fully mediated by neighborhood social processes and parenting quality, while deviant peer affiliations made independent contributions to problem behavior. The final mediation model explained children’s externalizing behavior equally well across gender and ethnicity, suggesting the presence of universal processes.