Tomás Cabeza de Baca

Methodologically Sound: Evaluating the Psychometric Approach to the Assessment of Human Life History [Reply to Copping, Campbell, and Muncer, 2014]

Copping, Campbell, and Muncer (2014) have recently published an article critical of the psychometric approach to the assessment of life history (LH) strategy. Their purported goal was testing for the convergent validation and examining the psychometric structure of the High-K Strategy Scale (HKSS). As much of the literature on the psychometrics of human LH during the past decade or so has emanated from our research laboratory and those of close collaborators, we have prepared this detailed response. Our response is organized into four main sections: (1) A review of psychometric methods for the assessment of human LH strategy, expounding upon the essence of our approach; (2) our theoretical/conceptual concerns regarding the critique, addressing the broader issues raised by the critique regarding the latent and hierarchical structure of LH strategy; (3) our statistical/methodological concerns regarding the critique, examining the validity and persuasiveness of the empirical case made specifically against the HKSS; and (4) our recommendations for future research that we think might be helpful in closing the gap between the psychometric and biometric approaches to measurement in this area. Clearly stating our theoretical positions, describing our existing body of work, and acknowledging their limitations should assist future researchers in planning and implementing more informed and prudent empirical research that will synthesize the psychometric approach to the assessment of LH strategy with complementary methods.

An Evolutionary Analysis of Variation in Parental Effort: Determinants and Assessment

SYNOPSIS Utilizing an evolutionary framework can elucidate the causes of variation in parental effort and guide measurement of relevant parenting constructs. The current article presents an evolutionary analysis of the determinants of parental effort and suggests that evolutionarily informed measures are needed to test evolutionary hypotheses. Towards this end, we employ evolutionary theory to guide development of new Parental Effort Scales, which supplement and extend extant methods for assessing coparenting.

Shared Parenting, Parental Effort, and Life History Strategy A Cross-Cultural Comparison

Previous developmental research has found that children from households with high shared parenting, childrearing agreement, and equitable division of parental labor experience positive developmental and social outcomes; a major limitation of these studies is that shared parenting measures do not assess the amount of total parental effort the child receives, but instead partitioning the amount of effort between parents. Life History (LH) theory predicts that the total amount of parenting the child receives should produce a greater developmental impact on the future LH strategies of children than precisely how that parental effort was apportioned between mothers and fathers. This report presents a cross-cultural study using convenience samples of university students in Mexico, the United States, and Costa Rica, investigating the relationship of total as well as shared parental effort on family emotional climate and the LH strategy of the participants as young adults. The first study was performed exclusively in Mexico; results indicated that higher levels of shared parenting experienced as a child were associated with Family Emotional Climate also during childhood and with participant adult LH. The second study extended these findings; higher total parental effort predicted shared parenting effort, positive emotional climate, and slower offspring adult life history strategy in the three convenience samples of Mexico, the United States, and Costa Rica.

The Stagnancy of Family Studies in Modern Academia: Resistances Toward the Integration of Evolutionary Theory

The theory of natural selection has been vital in unifying the biological sciences and their research with a single testable metatheory. Despite a plethora of research supporting natural selection, teaching the theory of evolution remains controversial in high schools and higher education (Wilson et al. 2009; Scott 1997). In this article, we sample the attitudes toward evolution of 170 faculty and graduate and undergraduate students in family studies and human development programs from across the United States to determine whether resistances toward evolution remain and to describe the correlates of these resistances. Results reveal that an individual’s prosocial meliorist attitudes, religious ideation, and his or her reported interest in and knowledge of evolution all uniquely contribute to whether they report evolutionary theory as being applicable to their area of research interests. We discuss the relevance of including evolutionary theory within family studies and human development research programs and make suggestions for how to implement an evolutionary studies program (Wilson et al. 2009).

Strategic differentiation and integration of genomic-level heritabilities facilitate individual differences in preparedness and plasticity of human life history

Life history (LH) strategies refer to the pattern of allocations of bioenergetic and material resources into different domains of fitness. While LH is known to have moderate to high population-level heritability in humans, both at the level of the high-order factor (Super-K) and the lower-order factors (K, Covitality, and the General Factor of Personality), several important questions remain unexplored. Here, we apply the Continuous Parameter Estimation Model to measure individual genomic-level heritabilities (termed transmissibilities). These transmissibility values were computed for the latent hierarchical structure and developmental dynamics of LH strategy, and demonstrate; (1) moderate to high heritability of factor loadings of Super-K on its lower-order factors, evidencing biological preparedness, genetic accommodation, and the gene-culture coevolution of biased epigenetic rules of development; (2) moderate to high heritability of the magnitudes of the effect of the higher-order factors upon their loadings on their constituent factors, evidencing genetic constraints upon phenotypic plasticity; and (3) that heritability of the LH factors, their factor loadings, and the magnitudes of the correlations among factors, are weaker among individuals with slower LH speeds. The results were obtained from an American sample of 316 monozygotic (MZ) and 274 dizygotic (DZ) twin dyads and a Swedish sample of 863 MZ and 475 DZ twin dyads, and indicate that inter-individual variation in transmissibility is a function of individual socioecological selection pressures. Our novel technique, opens new avenues for analyzing complex interactions among heritable traits inaccessible to standard structural equation methods.

Contributions of Matrilineal and Patrilineal Kin Alloparental Effort to the Development of Life History Strategies and Patriarchal Values: A Cross-Cultural Life History Approach

Childrearing behaviors are often shaped by familial and cultural principles that function as guides for socialization goals and effective childrearing practices. For an increasing number of Latino families, the extended kin often acts as a source of childcare support. Due to a scarcity of research on the familial support configurations of Latin American families, the current study utilizes a cross-cultural retrospective approach to explore the associations between matrilineal/patrilineal kin and life history strategies in relation to childrearing. Applying a family system and life history framework, the present model tested 200 university students from Mexico and Costa Rica on measures of family emotional environment and traditional social values (e.g., familismo/simpatía and patriarchal values). Results found that childcare assistance from patrilineal and matrilineal kin was associated with positive family emotional environment, which weakly mediated the association between kin care and slow life history. Positive associations were also found between matrilineal kin childcare and traditional Latin social values. However, patriarchal values were only predicted by higher levels of patrilineal kin aid. The results are consistent with the general theoretical literature of life history theory and family systems theory, suggesting that high levels of childcare produce positively emotional family climates, which in turn perpetuate the development of prosocial individuals with slow life history strategies. Implications for further research are discussed.

A social biogeography of homicide: Multilevel and sequential canonical examinations of intragroup unlawful killings.

A considerable number of publications have examined the effect of various geographical, life history, social, economic and political factors on homicide. However, few studies were interested in examining the effect of these forces in an integrated social biogeography of homicide. This study collected data for 172 nation-states from various publications and databases. Standardized Studentized residuals were extracted from a multilevel model examining the effects of geographical adjacency upon homicide rates. A general linear model was used, with the residuals, to observe the effects of physical, community, social, cultural, and cognitive ecology upon homicide. Two sequential canonical analyses (SEQCA) were conducted to determine the mediating effects among the ecological indicators with respect to homicide. In the SEQCA, we hypothesized physical ecology would lead to communal ecology, in turn leading to social ecology, subsequently leading to cognitive ecology, and ultimately to homicide. A parsimony test concluded that economic growth and inequality fully mediated the relationship between cognitive ecology and homicide residuals. Similarly, the effects of life history upon homicide were fully mediated by social ecology. This study suggests several social ecology factors appear to directly affect homicide; however, other aspects of ecology indirectly affected homicide through influences on social ecology. The effect of indicators of social ecology such as income inequality and the operational sex ratio indicate competition for resources is a significant force generating differences in homicide rates across populations. In conclusion, a suite of evolutionary pressures seems to influence homicide rates, but mainly in a sequential nature rather than simultaneously.

Reply to Van Lange et al.: Proximate and ultimate distinctions must be made to the CLASH model

Transcending reviewed proximate theories, Van Lange et al.s CLASH model attempts to ultimately explain the poleward declension of aggression and violence. Seasonal cold is causal, but, we contend, principally as an ecologically relevant evolutionary pressure. We further argue that futurity and restraint are life history variables, and that Life History Theory evolutionarily explains the biogeography of aggression and violence as strategic adaptation.

Lack of partner impacts newborn health through maternal depression: A pilot study of low-income immigrant Latina women

INTRODUCTION Latina women have a high burden of depression and other mental health issues, particularly in the perinatal period. Suboptimal maternal mental health can have adverse developmental and physiological impacts on child growth. The present study examines the impact of unplanned pregnancy and pregnancy relationship status on prenatal maternal depression in a sample of low-income Latina women. We hypothesized that the association between these prenatal stressors and newborn health would be mediated through prenatal depression. METHOD The present study included a sample 201 Latina mothers and their children recruited from prenatal clinics during their second or third trimesters. Depression symptomology, relationship status were collected prenatally. At birth, several indices of newborn health were examined, including head circumference percentile and birthweight. Finally, planned pregnancy status was retrospectively collected when the child was between 1 and 2 years old. RESULTS Structural equation modelling revealed that single women, compared to partnered women, had higher levels of depression. Higher levels of depression, in turn, predicted poorer newborn health. Unplanned pregnancy was not significantly associated with newborn health. DISCUSSION These results suggest that relationship status may be an important screening question for medical examiners to ask to pregnant Latina women during prenatal visits. These results are consistent with past research investigating the effects of maternal mental health on adverse birth outcomes that propose that stressful early environments shape developmental trajectories.

Sexual intimacy in couples is associated with longer telomere length

High-quality relationships have been shown to be beneficial for physical and mental health. This study examined overall relationship satisfaction and perceived stress as well as daily reports of partner support, partner conflict, and physical intimacy obtained over the course of one week in a sample of 129 high and low stress mothers. Telomere length was examined in whole blood, as well as the two cell subpopulations: peripheral blood mononuclear cells (PBMCs) and granulocytes. Telomerase activity was measured in PBMCs. Analyses revealed no statistically significant associations of telomere length with current relationship satisfaction, daily support or conflict, or perceived stress. In contrast, women who reported any sexual intimacy during the course of the week had significantly longer telomeres measured in whole blood and PBMCs, but not in granulocytes. These relationships held covarying for age, body mass index, perceived stress, the relationship indices, and caregiver status. Sexual intimacy was not significantly related to PBMC telomerase activity. These data provide preliminary data that sexual intimacy is associated with longer telomere length. Future studies investigating these associations are warranted.