Happiness and other emotions spread between people in direct contact, but it is unclear whether massive online social networks also contribute to this spread. Here, we elaborate a novel method for measuring the contagion of emotional expression. With data from millions of Facebook users, we show that rainfall directly influences the emotional content of… (More)
The modular organization of networks of individual neurons interwoven through synapses has not been fully explored due to the incredible complexity of the connectivity architecture. Here we use the modularity-based community detection method for directed, weighted networks to examine hierarchically organized modules in the complete wiring diagram… (More)
Dense cooperative networks are an essential element of social capital for a prosperous society. These networks enable individuals to overcome collective action dilemmas by enhancing trust (1-3). In many biological and social settings, network structures evolve endogenously as agents exit relationships and build new ones (4-6). However, the process by which… (More)
and the UCSD Behavioral International Relations workshop organizers, especially David Victor, for their thoughtful comments on previous versions of this paper.
Cognitive scientists, behavior geneticists, and political scientists have identified several ways in which emotions influence political attitudes, and psychologists have shown that emotion regulation can have an important causal effect on physiology, cognition, and subjective experience. However, no work to date explores the possibility that emotion… (More)
For decades, scholars of various disciplines have been fretted over strategic interactions, presenting theoretical insights and empirical observations. Despite the central role played by strategic interactions in creating values in the Internet environment, our ability to understand them scientifically and to manage them in practice has remained limited.… (More)