Beyond Heritability: Twin Studies in Behavioral Research

ABSTRACT— The heritability of human behavioral traits is now well established, due in large measure to classical twin studies. We see little need for further studies of the heritability of individual traits in behavioral science, but the twin study is far from having outlived its usefulness. The existence of pervasive familial influences on behavior means that selection bias is always a concern in any study of the causal effects of environmental circumstances. Twin samples continue to provide new opportunities to identify causal effects with appropriate genetic and shared environmental controls. We discuss environmental studies of discordant twin pairs and twin studies of genetic and environmental transactions in this context.     

Effects of Prenatal Social Stress on Offspring Development: Pathology or Adaptation?

ABSTRACT— In nonhuman mammals, the social environment in which pregnant females live is critical for their offsprings' brain development, endocrine state, and social and sexual behavior later in life. Social instability during pregnancy generally brings about a behavioral and neuroendocrine masculinization in daughters and a less pronounced expression of male-typical traits in sons. We favor the hypothesis that such behavioral effects of prenatal social stress are not necessarily "pathological" (nonadaptive) consequences of adverse social conditions. Rather, pregnant mothers could be adjusting their offspring to their environment in an adaptive way.     

Social regulation of human gene expression

ABSTRACT— The relationship between genes and social behavior has historically been construed as a one-way street, with genes in control. Recent analyses have challenged this view, by discovering broad alterations in the expression of human genes as a function of differing socio-environmental conditions. The emerging field of social genomics has begun to identity the types of genes subject to social regulation, the biological signaling pathways mediating those effects, and the genetic polymorphisms that moderate socioenvironmental influences on human gene expression.     

Why Euclid’s geometry brooked no doubt: J. H. Lambert on certainty and the existence of models

J. H. Lambert proved important results of what we now think of as non-Euclidean geometries, and gave examples of surfaces satisfying their theorems. I use his philosophical views to explain why he did not think the certainty of Euclidean geometry was threatened by the development of what we regard as alternatives to it. Lambert holds that theories other than Euclid’s fall prey to skeptical doubt. So despite their satisfiability, for him these theories are not equal to Euclid’s in justification. Contrary to recent interpretations, then, Lambert does not conceive of mathematical justification as semantic. According to Lambert, Euclid overcomes doubt by means of postulates. Euclid’s theory thus owes its justification not to the existence of the surfaces that satisfy it, but to the postulates according to which these “models” are constructed. To understand Lambert’s view of postulates and the doubt they answer, I examine his criticism of Christian Wolff’s views. I argue that Lambert’s view reflects insight into traditional mathematical practice and has value as a foil for contemporary, model-theoretic, views of justification.     

史易之间：三种易学的遐想

本文将几何学、历史学与天地之道分别与《乾凿度》之三易说相联系,对三门知识与《易》之关系进行了探讨,指出,要全面、正确地理解《易》,三种知识路径缺一不可。因此,《易》之“易也”、“变易也”、“不易也”也构成了《易》之三个不可或缺的内涵.     

家庭文化背景在儿童阅读发展中的作用

通过问卷调查和测验方法探讨了家庭文化背景与儿童阅读发展的关系。回归模型表明家庭文化背景对一、四年级儿童的阅读成就都有显著影响。路径分析进一步表明：仅父母与孩子问的文化活动对一年级儿童的阅读成就有直接影响,而家庭文化背景的四个方面相对独立地对四年级儿童的阅读发展产生影响。     

Home Environment and Classroom Climate: An Investigation of their Relation to Students’ Academic Self-Concept in a Streamed Setting

Many studies concur that students’ perceptions of their home and school environments, such as relationships with parents and teachers, are related to their academic self-concept (for example, Chang et al., Int J of Behav Dev 27(2):182–189, 2003; Ireson and Hallam, Br J Educ Psychol 75:297–311, 2005; Jang, J Kor Home Econ, 39:101–114, 2001; Lau and Leung, Br J Educ Psychol, 62:193–202, 1992; Lau and Pun, Social Behav Pers, 27(6):639–650, 1999; Masche and Barber, “Connectedness and separation in parent-adolescent relationships: Indicators of a successful identity development.” Paper presented at the SRCD Biennial Meeting, Minneapolis, MN, April 19–22, 2001; Sanders, “School–family–community partnerships and the academic achievement of African American, urban adolescents.” Report No. 7. EDRS. ED 402404, 1996). Nonetheless, little is known about whether the strength of the relationships is comparable for students of different ability streams, or if the predictors of variance of their academic self-concept are similar. To fill the empirical gap, a 3-year longitudinal study was conducted with Secondary One students (approximate age 13) from three government schools in Singapore. Pearson product–moment correlation and Fisher’s z _r transformation showed that there were significant differences in the strength of the relationships between higher- and lower-ability stream students’ academic self-concept and their perceived home environment and classroom climate. In addition, stepwise multiple linear regressions established that lower-ability stream students’ perceived teachers’ expectations had more consistent and substantial impact on their confidence level than that of their higher-ability stream counterparts. In comparison, higher-ability stream students’ perceived parental academic support had more consistent impact on their academic self-concept than that of their lower-ability stream peers.     

Environmental control and psychosis-relevant traits modulate the prospective sense of agency in non-clinical individuals

The sense of agency concerns the experience of being the source of one’s own actions and their consequences. An altered sense of agency can occur due to task automation and in psychosis. We tested in a non-clinical sample the hypothesis that reducing voluntary task control diminishes intentional binding as an implicit indicator of the sense of agency, possibly interacting with psychosis-relevant personality traits. Agent-device interactions were manipulated obtaining positive-control (voluntary interaction), no-control (automation), and negative-control (device-commanded interaction) groups. The main results showed reduced prospective intentional binding (predictive coding of action consequences) in the no-control and negative-control groups, compared to the positive-control group. Psychosis-like experiences covaried positively with intentional binding in the no-control group, but negatively in the negative-control group. Moreover, positive-social traits were associated with increased intentional binding in the positive-control group. These findings demonstrate the interplay between environmental and individual differences variables in establishing the implicit sense of agency.     

Religious Leaders and the Environmental Crisis

Despite the presence of forward‐looking religious leaders at higher levels, there is little recognition and understanding among local‐level leaders about climate change and the irreversible impacts of global warming. This article illustrates this lack of insight among religious leaders and provides suggestions to increase their awareness of the environmental crisis and its solutions. It uses as examples Islamic teachings that Muslim muftis can use to protect the environment, and emphasizes religious leaders’ influence, roles, and responsibility in establishing justice for the earth, for the next generations, and for all creation. Although most of the facts and examples in this article are from a Middle East and North Africa Region and Islamic perspective, its arguments can be applied generally.