Family of origin environments in two clinical samples of survivors of intra-familial, extra-familial, and both types of sexual abuse

OBJECTIVE: It has been suggested that survivors of ongoing childhood sexual abuse (CSA) tend to have been reared in ineffective family environments that render them particularly vulnerable to maltreatment and which foster psychological difficulties beyond those accounted for solely by their abuse. If this conjecture is valid, one would expect that the family of origin environments of CSA survivors would be disturbed whether their abuser was intra-familial or extra-familial. To assess this hypothesis, two studies compared the childhood family of origin environments and supportive parenting characteristics of a clinical sample of women sexually abused by family members only (the intra-familial group), by non-family members only (the extra-familial group), and by both family and non-family members (the "both" group). METHOD: Study 1 compared the three groups (total N = 213) using the Family Environment Scale (FES). Study 2 compared groups (total N = 86) on the positive parenting scales of the Exposure to Abusive and Supportive Environments Parenting Inventory (EASE-PI). RESULTS: In Study 1, multivariate analyses indicated significant differences on the independence, cohesion, and conflict subscales of the FES. Pairwise comparisons revealed that the extra-familial group reported significantly higher levels of family independence and lower levels of conflict than the other two groups. In addition, the extra-familial group reported higher levels of cohesion than the intra-familial group. However, the effect sizes of these comparisons were extremely small. In Study 2, multivariate analyses revealed no group differences on the EASE-PI scales. CONCLUSIONS: Low effect sizes on the three significant FES scales, non-significance on the remaining seven FES scales, and non-significance on the EASE-PI scales suggest that there is considerable similarity in the family of origin environments of adult female CSA survivors seeking therapy regardless of whether their perpetrators were family members, non-family members, or both family and non-family members.     

Latent Variable Models of Genotype-Environment Covariance

This study was concerned with the identification of genotype-environment covariance (CovGE) on measures of work-related variables. Two approaches to the estimation of CovGE were used, 1 based on a univariate behavior genetic model and the other based on a bivariate behavior genetic model. The sample consisted of 136 pairs of identical twins reared together, 175 pairs of fraternal twins reared together, 83 pairs of identical twins reared apart, and 182 pairs of fraternal twins reared apart, obtained from the Swedish Adoption/Twin Study of Aging (SATSA). Most of the CovGEs examined were significant, suggesting that (a) failure to specify CovGE in behavior genetic models will lead to bias in the estimates of the other parameters, and (b) CovGE is an important influence on individual difference in the workplace.     

Sibling Delinquency and the Family Environment: Shared and Unshared Influences

Few family studies of delinquency have focused on siblings. We use a sibling research design to evaluate shared (i.e., family) and unshared environmental influences on delinquency. The 15-22-year-old adolescent siblings were nationally representative, and uniquely, in families of 2 to 4 siblings. No unshared family environmental influences were found for sisters and for mixed-sex siblings, but they may exist for brothers. The data suggested substantial shared environmental and/or shared genetic influences for siblings: the median sibling correlations, averaged over family sizes, were: brothers, r = .30; sisters, r = .28, and mixed sex, r = .21.     

A biometrical analysis of perceptions of family environment: a study of twin and singleton sibling kinships

Biometrical genetic analysis was applied to sibling and twin kinship data on 2 dimensions of perceived home environment. Correlations on 1 dimension, Restrictiveness-Permissiveness, were equal and significant for all kinships: MZ twins, DZ twins, same-sex siblings, and opposite-sex siblings significant for all 4 kinships: MZ twins, DZ twins, same-sex siblings, and opposite-sex siblings (r greater than .40). An E2-E1 biometrical model fitted Restrictiveness-Permissiveness, implying that treatments common to siblings create agreement about perceived environment. As intrapair differences were the same for all 4 kinships under this model, the equal environments assumption of the twin method was supported. In contrast, the Acceptance-Rejection dimension fitted a G-E1 model that makes the assumption that sibling similarity is the result of genetic factors and postulates an absence of shared environmental influences. This finding suggests that this aspect of home environment may depend as much on the child's inherited traits as on actual treatments and is in accord with the genetic analysis of individual traits in that developmentally effective environmental factors do not appear to be common to siblings.     

Adolescent, parent, and observer perceptions of parenting: genetic and environmental influences on shared and distinct perceptions

Agreement among reporters on features of family life, whether family members or outside observers, is considered to be low. This study, which involved a national sample of 720 families comprised of identical and fraternal twins, full siblings, half siblings, and biologically unrelated stepsiblings, examined the issue of low interrater agreement by decomposing the common and unique variance among parent, child, and observer reports of parenting behaviors (warmth and negativity) into genetic and environmental factors. Quantitative genetic analyses were employed to decompose the "Social" level of perception (common variance among parents, children, observers), the level of "Family" subculture (common variance only among parents and children), and the unique "Individual" level into genetic and environmental components. It was predicted that genetic factors would account for substantial portions of the variance at the Social and Family levels; nonshared environmental factors were expected to influence variance unique to child reports; and shared environmental factors were expected to influence variance unique to parent reports. A second and related aim of the study was to examine the subjective-objective dimension of genetic effects on measures of the environment. Results of model-fitting analyses generally supported the predictions for parental warmth and negativity at the Family and Individual levels. At the Social level, genetic factors were predominant for parental negativity and shared environmental factors for parental warmth. The findings are discussed in terms of genetically influenced child effects on parenting and methodological difficulties in constructing latent variables.     

Childhood physical abuse, early social support, and risk for maltreatment: current social support as a mediator of risk for child physical abuse

OBJECTIVE: The study investigated whether perceptions of social support in adulthood partially mediated the associations between childhood experiences (i.e., receipt of physical abuse and levels of early social support) and adult risk for child physical abuse. METHOD: Participants included 598 general population adults who completed self-report measures designed to assess childhood physical abuse, perceptions of early and current social support, and risk factors for child physical abuse. Structural equation modeling was used to test and cross validate a model that included the direct effects of child physical abuse and early social support on child physical abuse risk, as well as mediated effects through an influence on adult perceptions of social support. RESULTS: Childhood physical abuse and early social support covaried, such that receipt of physical abuse was associated with lower levels of perceived early social support. Early support, but not child physical abuse, had an indirect effect (i.e., through current support) on child physical abuse risk. More specifically, levels of early support were directly related to adult perceptions of support, and adult perceptions of support were inversely associated with child physical abuse risk. Childhood physical abuse was directly related to child physical abuse risk. CONCLUSIONS: Low levels of early support may impact risk for child physical abuse by affecting perceptions of others as supportive in adulthood. The receipt of physical abuse in childhood, however, does not appear to impact perceptions of support in adulthood. Research is needed to identify additional factors that may explain the association between receipt of physical abuse in childhood and increased risk of child physical abuse in adulthood.     

The nature (and nurture) of children's perceptions of family chaos

Chaos in the home is a key environment in cognitive and behavioral development. However, we show that children's experience of home chaos is partly genetically mediated. We assessed children's perceptions of household chaos at ages 9 and 12 in 2337 pairs of twins. Using child-specific reports allowed us to use structural equation modeling to explore the genetic and environmental etiology of children's perceptions of chaos. We found that these perceptions are significantly heritable (22%), with the remainder explained by environmental influences. Finding that genes influence children's experience of chaotic environments has far-reaching implications for how we conceptualize the family home and its impact on cognitive and behavioral development.     

Genetic Influences on Activity Level in Early Childhood: Do Situations Matter?

Although genetic influences on individual differences in activity level (AL) are well documented, few studies have considered the etiology of AL from a contextual perspective. In the present study, cross-situational and context-specific genetic effects on individual differences in AL at age 2 were examined. The AL of 312 twin pairs (144 monozygotic and 168 dzygotic) was mechanically assessed with actigraphs in the home and in laboratory test and play situations. AL displayed significant genetic variance in all 3 situations. Moreover, actigraph scores significantly correlated across situations. Multivariate genetic model-fitting analyses found that the observed cross-situational continuity in AL was due entirely to genetic factors. Situational differences in AL arise from genetic, shared environmental, and nonshared environmental influences.     

Neonatal Temperament in Monozygotic and Dizygotic Twin Pairs

To determine if neonatal temperament was influenced by genetic factors, temperament was assessed in 316 newborn twins from 47 pairs of monozygotic (MZ) twins, 39 pairs of same-sex dizygotic (DZ) twins, and 72 pairs of opposite-sex dizygotic twins. The neonatal assessment focused on irritability, resistance to soothing, activity level, reactivity, and reinforcement value. Examination of intraclass correlations for MZ and DZ twins and the results of model-fitting analyses indicated that heritability estimates for neonatal temperament were not significantly different from zero, and that there was substantial environmental influence on neonatal temperament. Specific perinatal indicators of risk were found to account for some of the intrapair differences observed for the behavioral variables. It was concluded that there is no clear pattern of genetic influence on temperament in the neonatal period.     

Sibling differentiation in adolescence: implications for behavioral genetic theory

The presence of sibling "differentiating processes"--defined as processes in which increased sibling similarity in environmental or genetic factors leads to differences in sibling outcomes-poses a challenge for standard behavioral genetic theory and research. The presence of differentiation processes may affect estimates of genetic and environmental parameters in ways that have not been fully recognized. Utilizing data from the Nonshared Environment and Adolescent Development project, this study examined whether differentiating processes existed for seven composite indices of positive and negative adolescent adjustment. The 720 sibling pairs in the study were broken down into groups by age difference (0-4 years) between siblings. The hypothesis that siblings close in age would demonstrate lower correlations on adjustment measures was generally supported at two time points, three years apart. However, siblings one year apart at Time 1 were more similar to each other than were siblings two years apart, suggesting that shared environmental influences counteract sibling differentiation processes for these siblings. The overall trend supporting sibling differentiation was found to be unrelated to measures of sibling positivity and negativity.     

Home environment and school performance: a ten-year follow-up and examination of three models of environmental action

The home environments of 42 10- and 11-year-old children were examined when they were infants and again during middle childhood. Significant correlations were observed between home environments measured at both 2 years and 10 years and the children's SRA achievement test scores and their classroom behavior. However, the home environment at 6 months was only related to a limited number of classroom behaviors. Partial correlations were used to test 3 models of environmental action: Model I (primacy of early experience), Model II (predominance of the contemporary environment), Model III (cumulative effects in stable environments). Strongest relations were noted for the contemporary environment, but all 3 models received some support. Correlations between HOME scores and children's competence in middle childhood revealed a complex portrait that was not explainable with reference to a single model of environmental action. The version of the HOME Inventory used with families of elementary school children is also introduced.     

不同家庭环境的大学生自我价值感的比较研究

目的:探讨不同家庭环境对大学生自我价值感形成、发展的影响,寻找提高自我价值感的方法。方法:运用家庭环境量表和青少年自我价值感量表对540名福州高校大学生的家庭环境与自我价值感进行测查,并进行比较分析。结果:不同家庭环境下成长的大学生自我价值感得分有显著性差异。结论:家庭环境的不同因子从不同层面上对大学生自我价值感产生影响。轻松、和谐、融洽和民主的家庭环境有助于大学生自我价值感的健康发展。     

Childhood Experience and the Onset of Menarche: A Test of a Sociobiological Model

We tested predictions about psychosocial factors in the onset of menarche using data from a longitudinal study of 16-year-old girls. Belsky, Steinberg, and Draper have proposed a model that seeks to explain individual differences in maturational timing in terms of stressful childhood experiences. Their model hypothesizes that (1) individuals who grow up under conditions of family stress (2) experience behavioral and psychological problems which (3) provoke earlier reproductive readiness. In this study, the effect of family stressors on menarche was mediated by neither behavior problems nor weight, contrary to the predictions. However, the most provocative proposition advanced by Belsky et al. received empirical support. Family conflict and father absence in childhood predicted an earlier age of menarche, and these factors in combination with weight showed some evidence of an additive influence on menarche. A genetic inheritance model may provide a more parsimonious account of these data than does a conditional adaptation model derived from sociobiology.     

A cross-cultural study of parents' perceptions of early childhood programs

Cross-cultural studies in early childhood education assist in expanding perspectives and gaining increased understanding and appreciation of programs in other countries. Because both Sweden and the United States are interested in parent involvement in early childhood programs, a survey was conducted to assess parent's perceptions of these programs. Following a review of family life and early childhood education in Sweden and the United States are the specific components of the cross-cultural study. A stratified random sample of parents whose children were involved in early childhood programs was done in St. Louis County, MN, United States, and Kronobergs Lan, Småland, Sweden. In the first section of the five-part survey, parents indicated the degree to which they agreed or disagreed with statements about such areas as governmental support of children and families. Parents in Sweden felt more support of the government, whereas parents in the United States used early childhood programs as a support mechanism to increase their confidence. In the other four sections of the survey, parents rated the importance of various types of parental involvement and the importance of various materials, activities, and caregiver actions in their children's programs. In general, parents in Sweden valued informal contact and inner-directed creative materials and activities. Parents in the United States valued more confining activities such as rote counting, community-based experiences, and compliance with adult expectations. The influence of the macro-society on parents' perceptions as well as microsystem interactions and environments is evident in this study. As early childhood educators learn about and adapt new ideas to their own programs, the potential of cross-cultural studies becomes realized in improved opportunities for young children and their families.     

Mathematical ability of 10-year-old boys and girls: genetic and environmental etiology of typical and low performance

The genetic and environmental etiologies of 3 aspects of low mathematical performance (math disability) and the full range of variability (math ability) were compared for boys and girls in a sample of 5,348 children age 10 years (members of 2,674 pairs of same-sex and opposite-sex twins) from the United Kingdom (UK). The measures, which we developed for Web-based testing, included problems from 3 domains of mathematics taught as part of the UK National Curriculum. Using quantitative genetic model-fitting analyses, similar results were found for math disabilities and abilities for all 3 measures: Moderate genetic influence and environmental influence were mainly due to nonshared environmental factors that were unique to the individual, with little influence from shared environment. No sex differences were found in the etiologies of math abilities and disabilities. We conclude that low mathematical performance is the quantitative extreme of the same genetic and environmental factors responsible for variation throughout the distribution.     

Reading skills in early readers: genetic and shared environmental influences

The present study combined parallel data from the Northeast-Northwest Collaborative Adoption Projects (N2CAP) and the Western Reserve Reading Project (WRRP) to examine sibling similarity and quantitative genetic model estimates for measures of reading skills in 272 school-age sibling pairs from three family types (monozygotic twins, dizygotic twins, and unrelated adoptive siblings). The study included measures of letter and word identification, phonological awareness, phonological decoding, rapid automatized naming, and general cognitive ability. Estimates of additive genetic effects and shared environmental effects were moderate and significant. Furthermore, shared environmental effects estimated in twins were generally similar in magnitude to adoptive sibling correlations, suggesting highly replicable estimates across different study designs.     

Ecological correlates of adolescents' aspirations: Gender-related differences

The study examined to what extent the educational and occupational aspirations of adolescents were related to their perceptions of different learning contexts after taking into account associations between the aspirations and earlier measures of individual characteristics and family environments. Data were collected from 516 Australian 16-year-olds (266 females, 250 males) to assess their perceptions of family, teacher, peer, and school support for learning. Five years earlier data had been collected of their social status, ability, family environments, academic achievement, and attitudes to school. Blockwise selection and the calculation of sheaf coefficients were used in path models to examine the influences on aspirations. For educational aspirations, most of the effects of the measures from the initial survey were mediated by an ecological construct that gauged the adolescents' perceptions of parent-teacher support for learning. Occupational aspirations of females were influenced only by ecological variables while for males they were related either directly or indirectly to all the ecological and individual measures in the analysis. The findings indicated the significance for aspiration formation of an ecological construct defined by adolescents' perceptions of the support and encouragement for learning by fathers, mothers, and teachers. Further aspiration research is suggested to explore the possible implications of this ecological Construct.     

Modeling IQ change: evidence from the Texas Adoption Project

An analysis of genetic and environmental contributions to intellectual change was carried out by means of a path model applied to IQ data from the Texas Adoption Project, an adoption study in which children were measured on 2 occasions approximately 10 years apart. Included in the model were assortative mating, selective placement, genotype-environment correlation, a measure of socioeconomic status, and alternative hypotheses about cross-generation environmental transmission and the persistence of a trait over time. Some form of environmental transmission across generations was necessary, but either of the 2 forms tested was sufficient. The data were best fit by considering persistence over time to occur at the level of the developed trait. The effect of both genes and family environment was significant at the time of the first measurement, but only the genes made an additional contribution between the first and the second, suggesting the necessity of revising some popular stereotypes about development.     

Parental Involvement in Prekindergarten At-Risk Programs: Multiple Perspectives

The purpose of this study was to examine the relationships among the attitudes and perceptions of parents, teachers, and family support staff toward parental involvement in prekindergarten programs for children identified as being at risk for later school failure. Focus group interview data identified, from multiple perspectives, factors that encourage or discourage parents from assuming an active role in their young children's education. Results are discussed in terms of future research and program development efforts aimed at helping family support professionals and early childhood educators better meet the needs of the diverse groups of children and families represented in prekindergarten programs.     

Genetic and environmental influences on rapid naming and reading ability: A twin study

The present study assesses the genetic and environmental etiologies of reading, rapid naming (RN), and their covariation by fitting multivariate structural equation models to data from 587 twin pairs in which at least one member of the pair exhibited reading difficulties (low-range) and from 360 control (normal-range) twin pairs who were tested in the Colorado Learning Disabilities Research Center. Results from a bivariate phenotypic analysis with two hypothesized latent factors, READ and RN, indicated that the correlation between reading and rapid naming performance for the low-range sample was significantly higher than that of the normal-range sample. When this model was partitioned to include estimates of genetic, shared environmental, and nonshared environmental influences, resulting heritability estimates did not differ significantly for the low-range and normal-range samples for either READ or RN. However, similar to the phenotypic correlation, the genetic correlation between the READ and RN latent factors could not be equated for the two groups. Thus, the etiology of the relationship between reading performance and rapid naming may differ for children with reading difficulties and normally-achieving readers. Moreover, these results support previous findings that the best predictors of reading skills may differ for samples of children with normal reading levels and those with reading difficulties.