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.     

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。     

Capturing ruminative exploration: Extending the four-dimensional model of identity formation in late adolescence

Identity exploration has been associated with openness and curiosity but also with anxiety and depression. To explain these mixed findings, the four-dimensional identity formation model [Luyckx, K., Goossens, L., Soenens, B., & Beyers, W. (2006b). Unpacking commitment and exploration: Validation of an integrative model of adolescent identity formation. Journal of Adolescence, 29, 361–378.] was extended using data from two late adolescent samples (total N = 703). A fifth dimension, labeled ruminative (or maladaptive) exploration, was added as a complement to two forms of reflective (or adaptive) exploration already included in the model (i.e., exploration in breadth and exploration in depth). Results indicated that ruminative exploration was positively related to distress and to self-rumination. The two forms of reflective exploration, by contrast, were unrelated to well-being and positively to self-reflection. Ruminative and reflective exploration also helped to distinguish between two types of less adaptive identities (i.e., Ruminative Moratorium and Diffused Diffusion) in a six-cluster solution that also contained adaptive types of identity. Implications for current research on identity formation are discussed.     

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.     

An improved energy efficient cluster head selection protocol using the double cluster heads and data fusion methods for IoT applications

The more energy consumption is the major issue for wireless sensor network. In wireless sensor network (WSN), sensor nodes are fixed in various routing algorithms. In the same networks, mobile sensor and fixed sensor nodes are combine and its used in few applications. The function is corruption while mobility was achieved, since these nodes have minimum battery power, lower range of communication and a lessor amount of memory. To overcome this issue, Improved Energy Efficient Cluster Head Selection protocol (IEECHS-WSN) is proposed, in these technique is used to transfer the received information by using energy efficient routing protocol. In the CH election method, two cluster heads are selected in a separated cluster and its work in various functions, this can be prolong the network lifetime and decrease the energy consumption of IoT applications. Proposed technique is described on clustering of dual CHs in the method of data fusion for data entropy. This information entropy is used for fusion and classification, the result of fusion and classification are accurate and efficient for data transmission. Our proposed IEECHS protocol has better throughput, lifetime of network and energy consumption compared than the existing technique.     

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.