Twitter is a widely used online social media. One important characteristic of Twitter is its real-time nature. In this paper, we investigate whether the daily number of tweets that mention Standard & Poor 500 (S&P 500) stocks is correlated with S&P 500 stock indicators (stock price and traded volume) at three different levels, from the stock market to industry sector and individual company stoc...

Background: Autism is characterized by difficulties in social interaction, communication, and repetitive behaviors; with different degrees of severity in each of the core areas. Haploinsufficiency and point mutations of RAI1 are associated with Smith-Magenis syndrome (SMS), a genetic condition that scores within the autism spectrum range for social responsiveness and communication, and is chara...

Although research on social embeddedness and social capital con-firms the value of friendship networks, little has been written about how social relations form and are structured by social institutions. Using data from the Adolescent Health and Academic Achievement study and the National Longitudinal Study of Adolescent Health, the authors show that the odds of a new friendship nomination were ...

Data from self-report and observational studies make it clear that problematic social anxiety confers interpersonal constraint that may contribute to the interpersonal dysfunction reported by individuals with social anxiety disorder. Direct observation of interpersonal behavior in established relationships is rare and difficult to obtain for practical reasons. We tested a flexible iterated pris...

Although computational models of cognitive agents that incorporate a wide range of cognitive functionalities have been developed in cognitive science, most of the work in social simulation still assumes rudimentary cognition on the part of the agents. In contrast, in this work, the interaction of cognition and social structures/processes is explored, through simulating survival strategies of tr...

The paper investigates the dynamic relationship between social trust and economic governance using a principal-agent model with stochastic returns. To mitigate the inherent moral hazard problem both intrinsic and extrinsic incentives are useful. The cooperative tendency of an agent measures his intrinsic discipline against shirking, the distribution of which characterizes social trust in societ...

One of the challenges facing researchers in the domain of human immunodeficiency virus prevention is the assessment of condom use in an unbiased self-reported manner. The current study presents the development and preliminary validation of an indirect condom use test (I-CUTE), designed to assess condom use tendencies and to overcome self-report biases. Two samples were included using correlatio...

Concepts such as hypnosis and dissociation have attracted increasing interest within dietary disorder research, especially in the investigation of bulimia nervosa and bulimic tendencies. A number of studies have revealed that, compared with agematched controls, individuals expressing bulimic tendencies demonstrate elevated levels of hypnotizability (e.g., Pettinati, Horne & Staats, 1985; Groth-...

The aim of the present study was to examine the validity of Prosocial Tendency Measure (PTM) in Iranian students. This scale measures 6 types of prosocial tendencies including altruistic, anonymous, dire, emotional, compliant and public prosocial tendencies (Carlo and Randal, 2002). We used 182 undergraduate students in order to study the validity of the scale by confirmatory factor analysis me...