Limit properties of Luce's choice theory

Luce's Axiom is interpreted in terms of a sequence of measures on the unit interval, and their limit properties are discussed. In particular, all limit laws are found to be either absolutely continuous with density x^α for α ∈ (?1, ∞) or else degenerate laws consisting of a point mass at 0 or 1. A close connection between Luce's choice theory and Karamata's theory of regularly varying functions is established and systematically used.     

The Role of Family Processes and Coping Strategies in the Relationship Between Parental Chronic Illness and Childhood Internalizing Problems

Sixty-nine families (father, mother, and one child) in which the father had hemophilia, approximately half of whom were HIV positive, were assessed in an examination of the relationship between parental chronic illness, family functioning, child coping strategies, and child adjustment. Latent variable path analyses with partial least-squares estimation procedures (PLS) were used to test a model of the relationship between parental chronic illness, family process variables, child coping strategies, and child internalizing behavior problems. The severity of the father's illness predicted family process variables, which predicted the coping style of the child. The use of more avoidant coping strategies was associated with more internalizing problems.     

Stimulus Equivalence and The Blocking Effect

The Psychological Record - The purpose of this experiment was to examine the blocking effect within the context of a stimulus equivalence paradigm. Ten subjects were provided with a prior history...     

Nuclear waste, secrecy and the mass media

Invited media scholars and journalists examine the general issue of nuclear waste, risk and the sicentific promises that were made, but not kept, about safe disposal. The mass media uncovered and reported on nuclear waste problems at Rocky Flats in Colorado and Hanford in Washington. Two environmental journalists review efforts to expose problems at these sites, how secrecy hampered reporting, and the effects of media coverage on nearby residents. An environmental communications scholar evaluates media coverage, the role of the U.S. Department of Energy, and the impact of secrecy on public risk perceptions and attitudes toward government nuclear waste policies.     

Distinguishing indeterminate belief from “risk-averse” preferences

I focus my discussion on the well-known Ellsberg paradox. I find good normative reasons for incorporating non-precise belief, as represented by sets of probabilities, in an Ellsberg decision model. This amounts to forgoing the completeness axiom of expected utility theory. Provided that probability sets are interpreted as genuinely indeterminate belief (as opposed to “imprecise” belief), such a model can moreover make the “Ellsberg choices” rationally permissible. Without some further element to the story, however, the model does not explain how an agent may come to have unique preferences for each of the Ellsberg options. Levi (1986, Hard choices: Decision making under unresolved conflict. Cambridge, New York: Cambridge University Press) holds that the extra element amounts to innocuous secondary “risk” or security considerations that are used to break ties when more than one option is rationally permissible. While I think a lexical choice rule of this kind is very plausible, I argue that it involves a greater break with xpected utility theory than mere violation of the ordering axiom.     

The interaction of perfectionism, perceived weight status, and self-esteem to predict bulimic symptoms: the role of 'benign' perfectionism

The present study sought to replicate an interactive model of global perfectionism, perceived weight status, and self-esteem in predicting bulimic symptom development in a sample of young women [Bardone-Cone, et al. (2006). Predicting bulimic symptoms: An interactive model of self-efficacy, perfectionism, and perceived weight status. Behaviour Research and Therapy, 44, 27-42; Vohs, K. D., et al. (1999). Perfectionism, perceived weight status, and self-esteem interact to predict bulimic symptoms: A model of bulimic symptom development. Journal of Abnormal Psychology, 108, 695-700; Vohs, K. D., et al. (2001). Perfectionism, body dissatisfaction, and self-esteem: An interactive model of bulimic symptom development. Journal of Social and Clinical Psychology, 20, 476-497]. The aim was to investigate the role of 'problematic' and 'benign' perfectionism within this model, using data from 95 female university students over a 3-month period. Contrary to hypotheses, multivariate analyses revealed a significant three-way interaction only between 'benign' perfectionism, perceived weight status and self-esteem in predicting change in bulimic symptoms over a 3-month period. The predictive effect of the interaction between 'benign' perfectionism and perceived weight status on bulimic symptoms was strongest for women with high self-esteem, for whom feeling overweight and having perfectionistic attitudes preceded increased bulimic symptoms. These findings suggest that high self-esteem is insufficient to protect against the development of bulimic symptoms when both the perception of oneself as being overweight, and high levels of perfectionistic standards, are present. It would appear that the role of perfectionism within the context of disordered eating is complex.     

Situational disengagement and persistence in the face of adversity

Research suggests that the experience of belonging to a group whose academic abilities are negatively stereotyped fosters disidentification over time, that is, the psychological insulation of the self from academic evaluations and outcomes (Crocker, Major, & Steele, 1998). This research tests whether the process of disidentification can ironically improve motivation when mobilized in response to specific situations. Black and White participants were given negative feedback on an ability-diagnostic or non-diagnostic task. Subsequently, all participants were given the opportunity to persist on the task and their level of disengagement was assessed. As hypothesized, Black participants in the diagnostic condition displayed the most persistence as well as the most disengagement and this persistence response was mediated by their disengagement. The results suggest that, in contrast to chronic disengagement, situational disengagement may help facilitate motivation and persistence.     

African Americans and High Blood Pressure: The Role of Stereotype Threat

We examined the effect of stereotype threat on blood pressure reactivity. Compared with European Americans, and African Americans under little or no stereotype threat, African Americans under stereotype threat exhibited larger increases in mean arterial blood pressure during an academic test, and performed more poorly on difficult test items. We discuss the significance of these findings for understanding the incidence of hypertension among African Americans.