Models of risk-taking as used in the social sciences may be improved by including concepts from life history theory, particularly environmental unpredictability and life expectancy. Community college students completed self-report questionnaires measuring these constructs along with several well-known correlates. The frequency of risk-taking was higher for those with higher future unpredictability beliefs and shorter lifespan estimates (as measured by the Future Lifespan Assessment developed for this study), and unpredictability beliefs remained significant after accounting for standard predictors, such as sex and (...) temperament. The results demonstrate the usefulness of applying concepts from life history theory to enhance our understanding of human behavior. (shrink)

Life history theory suggests that in risky and uncertain environments the optimal reproductive strategy is to reproduce early in order to maximize the probability of leaving any descendants at all. The fact that early menarche facilitates early reproduction provides an adaptationist rationale for our first two hypotheses: that women who experience more risky and uncertain environments early in life would have (1) earlier menarche and (2) earlier first births than women who experience less stress at an early age. Attachment theory (...) and research provide the rationale for our second two hypotheses: that the subjective early experience of risky and uncertain environments (insecurity) is (3) part of an evolved mechanism for entraining alternative reproductive strategies contingent on environmental risk and uncertainty and (4) reflected in expected lifespan. Evidence from our pilot study of 100 women attending antenatal clinics at a large metropolitan hospital is consistent with all four hypotheses: Women reporting more troubled family relations early in life had earlier menarche, earlier first birth, were more likely to identify with insecure adult attachment styles, and expected shorter lifespans. Multivariate analyses show that early stress directly affected age at menarche and first birth, affected adult attachment in interaction with expected lifespan, but had no effect on expected lifespan, where its original effect was taken over by interactions between age at menarche and adult attachment as well as age at first birth and adult attachment. We discuss our results in terms of the need to combine evolutionary and developmental perspectives and the relation between early stress in general and father absence in particular. (shrink)

What motivates grandparents to their altruism? We review answers from evolutionary theory, sociology, and economics. Sometimes in direct conflict with each other, these accounts of grandparental investment exist side-by-side, with little or no theoretical integration. They all account for some of the data, and none account for all of it. We call for a more comprehensive theoretical framework of grandparental investment that addresses its proximate and ultimate causes, and its variability due to lineage, values, norms, institutions (e.g., inheritance laws), and (...) social welfare regimes. This framework needs to take into account that the demographic shift to low fecundity and mortality in economically developed countries has profoundly altered basic parameters of grandparental investment. We then turn to the possible impact of grandparental acts of altruism, and examine whether benefits of grandparental care in industrialized societies may manifest in terms of less tangible dimensions, such as the grandchildren's cognitive and verbal ability, mental health, and well-being. Although grandparents in industrialized societies continue to invest substantial amounts of time and money in their grandchildren, we find a paucity of studies investigating the influence that this investment has on grandchildren in low-risk family contexts. Under circumstances of duress there is converging evidence that grandparents can provide support that helps to safeguard their children and grandchildren against adverse risks. We conclude by discussing the role that grandparents could play in what has been referred to as Europe's demographic suicide. (shrink)

This article examines changes in employed African American mothers' use of relatives for child care. Data from nationally representative pooled cross sections show that the proportion of Black mothers relying on extended kin for care of their preschool-age children declined significantly between 1977 and 1994. Multivariate analyses reveal that the decline characterized all subgroups of employed African American mothers but was less pronounced for young, single, mothers living outside the South. Thus, by 1994, employed Black mothers who most needed relatives' (...) child care support received it, while those who could manage without such help did so. This change suggests that African Americans' use of kin-provided support responds to shifts in broader social and economic conditions that affect the balance of resources and needs within extended families. (shrink)

In most social species, position in the male social hierarchy and reproductive success are positively correlated; in humans, however, this relationship is less clear, with studies of traditional societies yielding mixed results. In the most economically advanced human populations, the adaptiveness of status vanishes altogether; social status and fertility are uncorrelated. These findings have been interpreted to suggest that evolutionary principles may not be appropriate for the explanation of human behavior, especially in modern environments. The present study tests the adaptiveness (...) of social status with actual mating and reproductive data in a representative sample of males from an industrial society. Reproductive success, even when assessed by a more reliable measure ofactualmale fertility than the one commonly used, fails to correlate with social status. In striking contrast, however, status is found to be highly correlated withpotentialfertility, as estimated from copulation frequency. Status thus accounts for as much as 62% of the variance in thisproximatecomponent of fitness. This pattern is remarkably similar to what is found in many traditional societies and would result in a substantial positive relationship between cultural and reproductive success in industrial populations were it not for the novel conditions imposed by contraception and monogamy. Various underlying mechanisms are suggested for these findings, illustrating the value of current behavioral and reproductive data in the study of adaptation. It is concluded that evolutionary explanations of human behavior remain entirely relevant in modern societies. (shrink)

The mother–adult daughter relationship has been highlighted in both the social sciences and the public health literature as an important facet of social support networks, particularly as they pertain to maternal and child health. Evolutionary anthropologists also have shown positive associations between support from maternal grandmothers and various outcomes related to reproductive success; however, many of these studies rely on proximity as a surrogate measure of support. Here I present data from the Puerto Rican Maternal and Infant Health Survey (PRMIHS) (...) comparing geographic proximity of mother and daughter with a self-reported measure of mother-to-daughter support. These two measures were used to predict infant health outcomes as well as various measures of instrumental and emotional aid provided during pregnancy and after birth. Primary support was shown to have a positive effect across the analyses, whereas geographic proximity was associated with an increased risk of infant mortality and low birth weight as well as reduced odds of receiving support. This paradox was then examined using a combination variable that teased out the interactions of maternal support and proximity. Women who were geographically close to their mothers but who did not consider them a primary source of support had increased odds of infant death and low birth weight, and were less likely to receive either tangible or intangible forms of aid, while women whose mothers were both close and primary showed uniformly positive outcomes. These results place the role of propinquity within the larger context of social support and highlight the need for more detailed studies of social support within evolutionary anthropology. (shrink)

Guided by principles of life history strategy development, this study tested the hypothesis that sexual precocity and violence are influenced by sensitivities to local environmental conditions. Two models of strategy development were compared: The first is based on indirect perception of ecological cues through family disruption and the second is based on both direct and indirect perception of ecological stressors. Results showed a moderate correlation between rates of violence and sexual precocity (r = 0.59). Although a model incorporating direct and (...) indirect effects provided a better fit than one based on family mediation alone, significant improvements were made by linking some ecological factors directly to behavior independently of strategy development. The models support the contention that violence and teenage pregnancy are part of an ecologically determined pattern of strategy development and suggest that while the family unit is critical in affecting behavior, individuals’ direct experiences of the environment are also important. (shrink)

Life history theory predicts that greater extrinsic mortality will lead to earlier and higher fertility. To test this prediction, I examine the relationship between life expectancy at birth and several proxies for life history traits (ages at first sex and first marriage, total fertility rate, and ideal number of children), measured for both men and women. Data on sexual behaviors come from the Demographic and Health Surveys (DHS). Two separate samples are analyzed: a cross-sectional sample of 62 countries and a (...) panel sample that includes multiple cross-sectional panels from 48 countries. Multivariate regression analysis is used to control for potential confounding variables. The results provide only partial support for the predictions, with greater support among women than men. However, the prediction is not supported in sub-Saharan African countries, most likely owing to the nonequilibrium conditions observed in sub-Saharan Africa with respect to life expectancy. The applicability of the model to understanding HIV/AIDS risk behaviors is discussed. (shrink)

Coall & Hertwig (C&H) demonstrate the importance of grandparents to children, even in low fertility societies. We suggest policy-makers interested in reproductive timing in such contexts should be alerted to the practical applications of this cooperative breeding framework. The presence or absence of a supportive kin network could help explain why some women begin their reproductive careers or.

This response outlines more reasons why we need the integrative framework of grandparental investments and intergenerational transfers that we advocated in the target article. We discusses obstacles that stand in the way of such a framework and of a better understanding of the effects of grandparenting in the developed world. We highlight new research directions that have emerged from the commentaries, and we end by discussing some of the things in our target article about which we may have been wrong.

The target article emphasizes the need to identify psychological mechanisms underlying grandparental investment, particularly in low-risk family contexts. We extend this approach by addressing the changing demands of balancing work and family in low-risk families. Taking a lifespan psychological perspective, we identify additional motivators and potential benefits of grandparental investment for grandparents themselves and for subsequent generations.

This paper investigates hypotheses drawn from two sources: (1) Belsky, Steinberg, and Draper’s (1991) attachment theory model of the development of reproductive strategies, and (2) recent life history models and comparative data suggesting that environmental risk and uncertainty may be potent determinants of the optimal tradeoff between current and future reproduction. A retrospective, self-report study of 136 American university women aged 19–25 showed that current recollections of early stress (environmental risk and uncertainty) were related to individual differences in adult time (...) preference and adult sexual behavior, and that individual differences in time preference were related to adult attachment organization and sexual behavior. These results are consistent with the hypothesis that perceptions of early stress index environmental risk and uncertainty and mediate the attachment process and the development of reproductive strategies. On this view individual differences in time preference are considered to be part of the attachment theoretical construct of an internal working model, which itself is conceived as an evolved algorithm for the contingent development of alternative reproductive strategies. (shrink)

Since the seminal works of Draper and Harpending (1982) and Belsky et al. (1991) there has been considerable interest in the link between the family environment experienced as a child and consequent mating and reproductive strategy of females. In this paper, predictions from the hypothesis were tested using postal survey data from a cross-section of 415 women in Merseyside, UK. No relationships were found between father-absence, unrelated male-presence, parental divorce or parental death with age at first coitus, number of sexual (...) partners, mean length of sexual relationships or mean length of relationships prior to coitus occurring. (shrink)

In the United States, low-income or minority populations tend toward earlier births than the more advantaged. In disadvantaged populations, one factor that may exert pressure toward early births is “weathering,” or pervasive health uncertainty. Are subjective perceptions of health related to fertility timing? Drawing on a small sample of intensive interviews with teenage mothers-to-be, I suggest that low-income African American teenagers may expect uncertain health and short lifespans. Where family economies and caretaking systems are based on kin networks, such perceptions (...) may influence the decision to become a young mother. Heuristic typologies of ways socially situated knowledge may contribute to the reproduction of fertility timing practices contrast the experiences of poor African American interviewees, working class white interviewees, and middle-class teens who typically postpone childbearing. (shrink)

Effective public health nursing relies on the development of responsive and collaborative relationships with families. While nurse–family relationships are endorsed by home visitation programs, training nurses to follow visit‐to‐visit protocols may unintentionally undermine these relationships and may also obscure nurses’ clinical understanding and situated knowledge. With these issues in mind, we designed a home‐visiting intervention, titled Listening with Care, to cultivate nurses’ relationships with teen mothers and nurses’ clinical judgment and reasoning. Rather than using protocols, the training for the intervention (...) introduced nurses to narrative methods and therapeutic tools. This mixed‐method pilot study included a quasi‐experimental design to examine the effect of the intervention on teen mothers’ depressive symptoms, self‐silencing, repeat pregnancy, and educational progress compared to teens who received usual care. Qualitative data were collected from the nurses to evaluate the feasibility and acceptability of the intervention and therapeutic tools. The nurses endorsed the therapeutic tools and expected to continue using them in their practice. Despite the lack of statistically significant differences in outcomes between groups, findings suggest that further study of the intervention is warranted. Future studies may have implications for strengthening hidden aspects of nursing that make a difference in the lives of teen mothers. (shrink)

Although the positive outcomes achieved in home‐visiting interventions targeting young, disadvantaged mothers are partly credited to therapeutic relationships, researchers rarely offer philosophical or theoretical explanations for these relationships. This omission is a conspicuous oversight as nurse–family relationships have figured prominently in public health nursing practice since its inception. In this study, I suggest that the contribution of therapeutic relationships to positive outcomes will remain theoretically undeveloped as long as clinical trials and nursing practice models follow the logic of techne. After (...) describing how a scientific–clinical gaze misrepresents teen mothers and contributes to a rational–technical model of clinical practice, I draw on contemporary hermeneutics to describe how dialog and understanding are indispensable for clinical judgment and the judicious use of scientific knowledge. This hermeneutic corrective calls attention to the dialogical nature of truth and the relational skills that disclose meaning, preserve personhood, and support possibilities available in the life‐world. Dialogical understanding also disrupts the scientific–clinical gaze by disclosing the social disparities that are implicated in early childbearing and teen mothers’ long‐term prospects. The implications of this thought for legitimating and supporting the flexibility and clinical know‐how that ‘strays’ from protocol‐driven care is addressed. (shrink)

Taking debates about the roles of structure and agency in health as a lens, this essay asks how Critical Realist and Feminist Intersectional approaches might inform health interventions research. Despite recognition of multiple determinants of health, health problems are often thought of as individual and interventions, in turn, target risky individual behaviours. Such approaches are rooted in a liberal model of personhood. This paper critiques enduring individualist assumptions linked to Western liberal underpinnings embedded in health interventions. It posits the need (...) to include a robust conception of the social world in which change depends on shifting power relations, and individual agency is shaped by power as well as individual will. We propose preliminary steps for undertaking critical realist intersectional interventions research. (shrink)