Asymmetric payoffs in simultaneous and sequential prisoner’s dilemma games

We investigate the role of payoff asymmetry in laboratory prisoner’s dilemma games. Symmetric and asymmetric games are examined in simultaneous and sequential settings. In the asymmetric sequential games, we study the impact of having payoff advantaged players moving either first or second. Asymmetry reduces the rates of cooperation in simultaneous games. In sequential games, asymmetry interacts with order of play such that the rate of cooperation is highest when payoff disadvantaged players move first.     

Models of school-age child care: A review of current research on implications for women and their children

This article discusses various models of children's out-of-school care arrangements, mainly in the United States of America. Forms of care include programs or centers, family day care homes, and self-care. The implications of each of these different systems of care and outcomes for both children and their parents are reviewed through the lens of existing research. While there is no consensus in the research literature, so-called “latch-key” children appear to experience more negative effects than supervised peers, although these negative effects may be mitigated by variables, such as the amount of time spent alone and the parent-child relationship. A small group of studies finds positive outcomes for children who participate in recreational after-school programs, although age-inappropriate care arrangements and age of participating child may be associated with negative outcomes. No research has been conducted across program types. Many mothers of school-age children without regular after-school care or alternative care on school holidays, appear to accomodate their career and work choices to their children's schedules, possibly in order to avoid the “latch-key” alternative.     

Heterogenous demand for public goods: Behavior in the voluntary contributions mechanism

Numerous laboratory experiments have investigated the performance of several processes for providing public goods through voluntary contributions. This research has been able to identify features of the institution or environment which are reliably likely to produce outcomes “close” to the free riding outcome or “substantially” greater than the pessimistic prediction of standard models. One such feature is the “marginal per-capita return” (MPCR) from the public good. Various authors have altered MPCR between groups or for an entire group at the same time. The experiments reported here address a different question, “What would happen if, within a group, some persons faced a ‘high’ MPCR while others faced a ‘low’ MPCR?”     

The effects of delayed menarche in different contexts: Dance and nondance students

The premise that effects of maturational timing are mediated by social context is explored by comparing adolescent girls in dance and nondance schools. Because the dance student must maintain a relatively low body weight, being a late maturer (who is often leaner than an on-time maturer) is expected to be more advantageous to the dancer than to the student not required to meet a weight standard. Girls aged 14 to 18 were seen; 276 attended private schools and 69 attended national ballet company schools. AllSs were weighed and measured and asked questions about their secondary sexual development, weight-related concerns, eating concerns, adult sex-role expectancies, body image, emotional functioning, and family relationships. Menarcheal age was used to classify girls as early (before 11.5 years of age), on time (between 11.5 and 14 years), and late maturers (after 14 years). More dance than non-dance school students were late maturers (55% versus 29%). The dance students weighed less and were leaner, had higher eating scores, and had lower family relationship and impulse control scores than the comparison sample. Across groups, late maturing students weighed less, were leaner, and had lower diet and higher oral control scores than on-time maturers, with the differences more pronounced in the dance than nondance students. In addition, the on-time dancers had higher psychopathology, perfection, and bulimia scores and lower body image scores than the late maturing dancers. The findings are discussed in terms of a goodness of fit between the requirements of a social context and a person's physical and behavioral characteristics.This paper was prepared with the support of grants from the W. T. Grant Foundation and the National Institutes of Health.Ph.D. from the University of Pennsylvania. Research Interests: Girls' psychological adaptation to pubertal change, biosocial aspects of female reproductive events, development in at-risk children and adolescents.     

The social context of adolescent self-esteem

The global self-esteem of adolescents was examined in relation to two aspects of their daily lives: (a) the perceived quality of their relationships with parents and peers; and (b) their self-evaluation in the areas of school, popularity, and athletics. The quality of relationships with parents made significant contributions to the explained variance in self-esteem of both boys and girls. The quality of peer relationships made a significant additional contribution for girls but not boys. The importance of parent and peer relationships to self-esteem did not vary as a function of age for either sex. Self-evaluation of popularity was related to girls' global self-esteem, while evaluation of school performance was more important for boys.Received her Ph.D. from George Peabody College. Research interests include adolescent stress and coping, and parent-child relationships.Received his M.D. from Medical College of Georgia. Research interests include stress, eating disorders, and pregnancy in adolescents.