Reflections on Ethics and Game Theory

Applications of game theory to moral philosophy are impededby foundational issues and troublesome examples. In the first part of this paper,questions are raised about the appropriate game-theoretical frameworks for applications to moralphilosophy and about the proper interpretations of the theoretical devices employed inthese frameworks. In the second part, five examples that should be of particular interest to thoseinterested in the connections between ethics and game theory are delineated and discussed. Thefirst example comprises games in which there is an outcome unanimously preferred to the``solution' of the game, appropriately defined. The second comprises games whose solution callsfor different players to employ different strategies. The third comprises games whosesolution calls for players to adopt mixed strategies. The fourth comprises games whose solutionrequires players to cycle among a variety of strategies. The fifth comprises games whose solutionrequires players to discriminate in morally inappropriate ways.     

Studies of the vicarious traumatization of college students by the September 11th attacks: effects of proximity, exposure and connectedness

From mid-October 2001 through the end of November 2001, we collected fairly large sets of questionnaires from undergraduates at three public universities (Albany, NY, n = 507, Augusta, GA, n = 336, Fargo, ND, n = 526 ) to assess rate of acute stress disorder (ASD) and level of ASD symptoms following the September 11th attacks, rate of current posttraumatic stress disorder (PTSD) and level of PTSD symptoms, and current level of depressive symptoms resulting from the September 11th attacks. We also gathered information on exposure to media coverage of the attacks, connectedness to the World Trade Center (WTC) and personnel there, and degree of engagement in reparative acts such as giving blood, attending vigils. We found higher levels of ASD, ASD symptoms, PTSD and PTSD symptoms as a function of geographical proximity to New York City (and within the Albany site, proximity of students' homes) and gender. Exposure (hours of TV watched) was a predictor in some instances as was connectedness to WTC victims. ASD symptoms were the strongest predictor of subsequent PTSD symptoms. Path models accounted for over 60% of the variance in PTSD symptoms.     

The intervention selection bias: an underrecognized confound in intervention research

Selection bias can be the most important threat to internal validity in intervention research, but is often insufficiently recognized and controlled. The bias is illustrated in research on parental interventions (punishment, homework assistance); medical interventions (hospitalization); and psychological interventions for suicide risk, sex offending, and juvenile delinquency. The intervention selection bias is most adequately controlled in randomized studies or strong quasi-experimental designs, although recent statistical innovations can enhance weaker designs. The most important points are to increase awareness of the intervention selection bias and to systematically evaluate plausible alternative explanations of data before making causal conclusions.     

Implicit learning of nonlocal musical rules: implicitly learning more than chunks

Dominant theories of implicit learning assume that implicit learning merely involves the learning of chunks of adjacent elements in a sequence. In the experiments presented here, participants implicitly learned a nonlocal rule, thus suggesting that implicit learning can go beyond the learning of chunks. Participants were exposed to a set of musical tunes that were all generated using a diatonic inversion. In the subsequent test phase, participants either classified test tunes as obeying a rule (direct test) or rated their liking for the tunes (indirect test). Both the direct and indirect tests were sensitive to knowledge of chunks. However, only the indirect test was sensitive to knowledge of the inversion rule. Furthermore, the indirect test was overall significantly more sensitive than the direct test, thus suggesting that knowledge of the inversion rule was below an objective threshold of awareness.     

Posttraumatic stress and depressive symptoms in a college population one year after the September 11 attacks: the effect of proximity

As a follow-up to our earlier report [Behav. Res. Ther., in press] on the level of posttraumatic stress symptoms (PTSS), depressive symptoms, and frequency of diagnoses of probable posttraumatic stress disorder (PTSD) among college students at three public universities (Albany, NY, Augusta, GA, and Fargo, ND) resulting from the September 11, 2001. Terrorist attacks, we surveyed comparable groups of students (total, n = 1313) from these three institutions in the weeks following the first anniversary (2002) of the attacks. We found proximity effects (Albany higher than Augusta which was higher than Fargo) for PTSS and depressive symptoms but not for frequency of diagnoses of probable PTSD. Within the Albany site data, proximity of county of residence to New York City (NYC) also showed a proximity effect on PTSS. Although depressive symptoms were significantly different in 2002 versus 2001, the arithmetic differences in PTSS or in frequency of diagnoses of probable PTSD were not significant. The September 11 attacks continued to exert a psychic toll on college students even a year later.     

Assessing stress in cancer patients: a second-order factor analysis model for the Perceived Stress Scale

Using the Perceived Stress Scale (PSS), perceptions of global stress were assessed in 111 women following breast cancer surgery and at 12 and 24 months later This is the first study to factor analyze the PSS. The PSS data were factor analyzed each time using exploratory factor analysis with oblique direct quartimin rotation. Goodness-of-fit indices (root mean square error of approximation [RMSEA]), magnitude and pattern of factor loadings, and confidence interval data revealed a two-factor solution of positive versus negative stress items. The findings, replicated across time, also indicate factor stability. Hierarchical factor analyses supported a second-order factor of "perceived stress." This alternative factor model of the PSS is presented along with observations regarding the measure's use in cancer research.     

Pyramidal training for families of children with problem behavior

The pyramidal training model was extended to multiple family members of children with behavior disorders. Three primary caregivers were taught to implement individualized treatments for problem behavior. They were then taught how to use various instructional strategies (e.g., prompting, feedback) to teach 2 other family members to implement the treatment. Results showed that pyramidal training was effective in increasing caregiver implementation of treatments across three families.     

Applying Cluster Analysis to Test a Typology of Homelessness by Pattern of Shelter Utilization: Results from the Analysis of Administrative Data

This study tests a typology of homelessness using administrative data on public shelter use in New York City (1988–1995) and Philadelphia (1991–1995). Cluster analysis is used to produce three groups (transitionally, episodically, and chronically homeless) by number of shelter days and number of shelter episodes. Results show that the transitionally homeless, who constitute approximately 80% of shelter users in both cities, are younger, less likely to have mental health, substance abuse, or medical problems, and to overrepresent Whites relative to the other clusters. The episodically homeless, who constitute 10% of shelter users, are also comparatively young, but are more likely to be non-White, and to have mental health, substance abuse, and medical problems. The chronically homeless, who account for 10% of shelter users, tend to be older, non-White, and to have higher levels of mental health, substance abuse, and medical problems. Differences in health status between the episodically and chronically homeless are smaller, and in some cases the chronically homeless have lower rates (substance abuse in New York; serious mental illness in Philadelphia). Despite their relatively small number, the chronically homeless consume half of the total shelter days. Results suggest that program planning would benefit from application of this typology, possibly targeting the transitionally homeless with preventive and resettlement assistance, the episodically homeless with transitional housing and residential treatment, and the chronically homeless with supported housing and long-term care programs.     

Predictors of Accurate and Inaccurate Memories of Traumatic Events Experienced in Childhood

How likely is it that traumatic childhood events are misremembered or forgotten? Research on children′s recollections of painful or frightening medical procedures may help answer this question by identifying predictors of accurate versus inaccurate memory. In the present study, 46 3- to 10-year-old children were interviewed after undergoing a stressful medical procedure involving urethral catheterization. Age differences in memory emerged, especially when comparing 3- to 4-year-olds with older children. Children′s understanding of the event, parental communication and emotional support, and children′s own emotional reactions also predicted accuracy. Memory did not reliably vary for children who endured the medical procedure once versus multiple times. Results are discussed in relation to possible precursors of accurate and false memories, and forgetting, of traumatic events experienced in childhood.