Admixture in Latin America: Geographic Structure, Phenotypic Diversity and Self-Perception of Ancestry Based on 7,342 Individuals

The current genetic makeup of Latin America has been shaped by a history of extensive admixture between Africans, Europeans and Native Americans, a process taking place within the context of extensive geographic and social stratification. We estimated individual ancestry proportions in a sample of 7,342 subjects ascertained in five countries (Brazil, Chile, Colombia, México and Perú). These individuals were also characterized for a range of physical appearance traits and for self-perception of ancestry. The geographic distribution of admixture proportions in this sample reveals extensive population structure, illustrating the continuing impact of demographic history on the genetic diversity of Latin America. Significant ancestry effects were detected for most phenotypes studied. However, ancestry generally explains only a modest proportion of total phenotypic variation. Genetically estimated and self-perceived ancestry correlate significantly, but certain physical attributes have a strong impact on self-perception and bias self-perception of ancestry relative to genetically estimated ancestry

Under the bridge: An in-depth examination of online trolling in the gaming context

Trolling is a subject of apparent academic confusion; the few studies conducted thus far yielded a variety of conflicting definitions regarding what constitutes trolling behaviour and little information regarding trolling motivations. In order to shed further light on this phenomenon, the present study aimed to (1) determine which behaviours actual trolls consider as trolling, (2) explore the motivations behind trolling, and (3) examine the online community’s response to trolling as perceived by the troll. After performing semi-structured interviews with 22 self-confessed trolls, we found that there is a variety of behaviours trolls consider trolling which can now be put in clear categories based on target and method. Three key motivations to troll emerged: personal enjoyment, revenge, and thrill-seeking. Trolling also appears to be a cyclical, self-perpetuating phenomenon enabled by the online community at large. Theoretical implications for future trolling research are also discussed