Nurture
The Social Division of Care Work Time Over Half a Century
Pilar Gonalons-Pons & Zohra Ansari-Thomas
Demography, forthcoming
Abstract:
This study introduces a demographic framework to analyze the social division of care work time, defined as the sum of paid and unpaid care work time provided to children and adults in a population. Combining data from the American Heritage Time Use Survey (AHTUS) and the Current Population Survey Annual Social and Economic Supplement (CPS-ASEC), we focus on routine interactive care and analyze how the volume and social division of this care work has evolved in the United States over a half century (1965-2018). Results reveal relative stability in the division of care work across domains (paid vs. unpaid and child vs. adult) but substantial change across social groups (by gender and race). The share of total care work provided by paid caregivers remained stable, challenging expectations about defamilialization, whereas the share of total care work going to adults increased over time. Gender and race inequality in total care work time experienced notable declines. Analyses show that these changes are driven by men's increased involvement in unpaid childcare and non-White women's declined involvement in some paid care jobs, respectively. Our framework provides new tools to examine how demographic, social, and economic changes impact the social organization of care work time.
Sterilization, Infecundity, and Reproductive Autonomy in Rural, Suburban, and Urban America: Results From a National Survey
Shelley Clark & Zoe Levy
Perspectives on Sexual and Reproductive Health, March 2025, Pages 72-84
Methods: Data from 10,081 sexually active women aged 15 to 49, who participated in the National Survey of Family Growth (2015-2019), were analyzed using binary and multinomial logistic regression analyses. Unadjusted and adjusted predicted probabilities were calculated to estimate the prevalence of (1) female sterilization, (2) desire for sterilization reversal or wanting a(nother) child if sterilized, and (3) unwanted infecundity among rural, suburban, and urban women.
Results: Rural women (24.2%) are substantially more likely than suburban (15.3%) or urban (13.9%) women to receive tubal ligation. These disparities are not explained by women's demographic, reproductive, religious, and socioeconomic characteristics. Rural women who are sterilized are not more likely than suburban or urban women to desire sterilization reversal or to want to have (more) children. However, because more rural women rely on tubal ligation, a significantly higher fraction of rural women (34.8%) than urban women (23.8%) who want to have a(nother) child are infecund. Roughly, 40% of infecund rural women who wish to conceive had tubal ligation.
Nurture and nonshared environment in cognitive development
Robert Plomin & Kaito Kawakami
Psychological Review, forthcoming
Abstract:
Behavioral genetic research has demonstrated that shared genetics, not shared environment, makes adults who grew up in the same family similar in personality and psychopathology. The same research affirms the importance of the environment but shows that salient environmental influences in adulthood are not shared by family members; they are unique to the individual. Cognitive traits such as cognitive abilities and educational achievement are thought to be an exception, with half of the environmental variance attributed to shared environmental influences. However, most of this cognitive research has involved children. Here, we show that shared environmental influence on cognitive abilities and educational achievement declines from accounting for 20%-30% of the variance in childhood to 10%-20% in adolescence and to near 0% by early adulthood. Educational attainment (years of schooling) shows lasting shared environmental influence (30%) carried over from decisions made in adolescence to go to university, which shows the greatest shared environmental influence (47%). We conclude that specific cognitive abilities as well as general cognitive ability show moderate shared environmental influence in childhood when children live at home, but this influence disappears as young people make their own way in the world. We propose that random endogenous processes are responsible for nonshared environmental influences on adult cognitive abilities. We discuss the far-reaching implications for understanding the environmental causes of individual differences in cognitive abilities in adulthood.
Family income and polygenic scores are independently but not interactively associated with cognitive performance among youth genetically similar to European reference populations
Sarah Paul et al.
Development and Psychopathology, forthcoming
Abstract:
Cognitive abilities are heritable and influenced by socioeconomic status (SES). It is critical to understand the association between SES and cognition beyond genetic propensity to inform potential benefits of SES-based interventions and to determine if such associations vary across (i) cognitive domains, (ii) facets of SES, and/or (iii) genetic propensity for different aspects of cognition. We examined the contributions of neighborhood socioeconomic advantage, family income, and polygenic scores (PGS) for domains of cognition (i.e., general cognitive ability, executive function, learning and memory, fluid reasoning) in a sample of children (ages 9-10; n = 5549) most genetically similar to reference populations from Europe. With some variability across cognitive outcomes, family income and PGS were independently significantly associated with cognitive performance. Within-sibling analyses revealed that cognitive PGS associations were predominantly driven by between-family effects suggestive of non-direct genetic mechanisms. These findings provide evidence that SES and genetic propensity to cognition have unique associations with cognitive performance in middle childhood. These results underscore the importance of environmental factors and genetic influences in the development of cognitive abilities and caution against overinterpreting associations with PGS of cognitive and educational outcomes as predominantly direct genetic effects.
Maternal education and prenatal smoking associations with adolescent executive function are substantially confounded by genetics
Lucas Perry, Nicolas Chevalier & Michelle Luciano
Developmental Psychology, forthcoming
Abstract:
Twin studies have suggested extremely high estimates of heritability for adolescent executive function, with no substantial contributions from shared environment. However, developmental psychology research has found significant correlations between executive function outcomes and elements of the environment that would be shared in twins. It is unclear whether these seemingly contradictory findings are best explained by genetic confounding in developmental studies or limitations in twin studies, which can potentially underestimate shared environment. In this study, we use genetic and phenotypic data from 5,939 participants, 4,827 participant mothers, and 2,903 participant fathers in the Millennium cohort to examine the role of genetics in explaining common environmental associations with executive function, assessed by the spatial working memory (SWM) task and Cambridge Gambling task. Bivariate genome-wide complex trait analysis (GCTA) revealed that single-nucleotide polymorphism effects were the sole significant predictor of the association between SWM and both maternal education and prenatal smoking. maternal GCTA and trioGCTA also found no significant evidence of indirect genetic effects on SWM, indicating that genetic nurture is unlikely to explain the bivariate GCTA results. The Cambridge Gambling task showed no significant single-nucleotide polymorphism heritability, suggesting that genetic influences on hot executive function may differ significantly from those on cool executive function. This study supports the twin study claim that the working memory component of executive function is primarily a genetic trait with minimal influence from shared environment, emphasizing the importance of using genetically sensitive designs to ensure that genetic confounding does not falsely inflate estimates of environmental influences on traits.