Detection of Deception in a Virtual World

This work explores the role of multimodal cues in detection of deception in a virtual world, an online community of World of Warcraft players. Case studies from a five-year ethnography are presented in three categories: small-scale deception in text, deception by avoidance, and large-scale deception in game-external modes. Each case study is analyzed in terms of how the affordances of the medium enabled or hampered deception as well as how the members of the community ultimately detected the deception. The ramifications of deception on the community are discussed, as well as the need for researchers to have a deep community knowledge when attempting to understand the role of deception in a complex society. Finally, recommendations are given for assessment of behavior in virtual worlds and the unique considerations that investigators must give to the rules and procedures of online communities.</jats:p

Growth Rates in Health Care Costs Are High and Stable

Highlights findings from a study of growth rates in health insurance premiums and healthcare spending in 1995-2006, factors behind the trends, and changes in the components of healthcare costs

Bayesian nonparametric multivariate convex regression

In many applications, such as economics, operations research and reinforcement learning, one often needs to estimate a multivariate regression function f subject to a convexity constraint. For example, in sequential decision processes the value of a state under optimal subsequent decisions may be known to be convex or concave. We propose a new Bayesian nonparametric multivariate approach based on characterizing the unknown regression function as the max of a random collection of unknown hyperplanes. This specification induces a prior with large support in a Kullback-Leibler sense on the space of convex functions, while also leading to strong posterior consistency. Although we assume that f is defined over R^p, we show that this model has a convergence rate of log(n)^{-1} n^{-1/(d+2)} under the empirical L2 norm when f actually maps a d dimensional linear subspace to R. We design an efficient reversible jump MCMC algorithm for posterior computation and demonstrate the methods through application to value function approximation

Spontaneous thought and vulnerability to mood disorders : the dark side of the wandering mind

There is increasing interest in spontaneous thought, namely task-unrelated or rest-related mental activity. Spontaneous thought is an umbrella term for processes like mind-wandering, involuntary autobiographical memory, and daydreaming, with evidence elucidating adaptive and maladaptive consequences. In this theoretical framework, we propose that, apart from its positive functions, spontaneous thought is a precursor for cognitive vulnerability in individuals who are at risk for mood disorders. It is important that spontaneous thought mostly focuses on unattained goals and evaluates the discrepancy between current and desired status. In individuals who stably (i.e., trait negative affectivity) or transitorily (i.e., stress) experience negative emotions in reaction to goal-discrepancy, spontaneous thought fosters major cognitive vulnerabilities (e.g., rumination, hopelessness, low self-esteem, and cognitive reactivity), which, in turn, enhance depression. Furthermore, we also highlight preliminary links between spontaneous thought and bipolar disorder. The evidence for this framework is reviewed, and we discuss theoretical and clinical implications of our proposal

SUBDUER

By reclaiming and translating the use of material in my work, I speak of oneness on a basic physical level. As the body in the images slips in and out of focus in abstraction of material, the objects patiently wait to be interjected into the composition of the space as a whole

Parental Bonding in Father-Son Relationships

The father-son relationship is an influential part of any boy’s development. It is hypothesized that there is a generational difference in this relationship between the older and younger generation. The Father Form of the Parental Bonding Instrument was used to assess this hypothesis. This questionnaire utilized 25 items, separated into the care and protection scales, to categorize parenting into four quadrants: affectionate constraint, optimal parenting, affectionless control and neglectful parenting. The results were compared between two groups, one of which consisted of males ages 25 to 45, representing the older generation, and the other consisted of males ages 18 to 22, representing the younger generation. According to the data, the older generation experienced more affectionless control relationships with their fathers compared to the younger generation who experienced more optimal relationships with their fathers. These findings support the hypothesis that there is a generational difference in the father-son relationships