Purpose: Early language and speech acquisition can be delayed in twin children, a twinning effect that diminishes between 4 and 6 years of age in a population-based sample. The purposes of this study were to examine how twinning effects influence the identification of children with language impairments at 4 and 6 years of age, comparing children…

Personality variables are associated with educational attainment and socioeconomic outcomes. In this study we incorporated a polygenic score derived from the largest genome-wide association study (GWAS) of educational attainment to date (Lee et al., 2018) into the Interactionist Model of R. D. Conger, Martin, and Masarik (2021) that describes the…

Socialization is the process of learning to be a human being that is born with the potential to be human. In this process, the person learns the basic values and norms of the society in which he lives, as well as the skills necessary to sustain his life. This learning takes place through parents, siblings, relatives, neighbors, peers, teachers,…

Transhumanism promotes the application of emerging technologies and genetics in order to overcome the physical and cognitive limitations of the human species. In this article, the main question to be considered is the following: is Nietzsche's notion of educational self-overcoming compatible with the idea of biotechnological self-enhancement?…

Educational attainment is a key behavioural measure in studies of cognitive and physical health, and socioeconomic status. We measured DNA methylation at 410,746 CpGs (N = 4152) and identified 58 CpGs associated with educational attainment at loci characterized by pleiotropic functions shared with neuronal, immune and developmental processes.…

Genetic and environmental factors account for variability in a range of developmental outcomes, including socioeconomic status (SES). The challenge is to find ways to incorporate genetic information based on studies using biologically related family members (i.e., studies not involving twins). To address this issue, we computed polygenic scores…

This work describes the development and evaluation of a two-session laboratory class based on Tet-on technology and sex determination in the fruit fly "Drosophila melanogaster." The Tet-on system allows conditional control of gene expression, when doxycycline is applied. A laboratory exercise has been developed to illustrate how the…

Conoley, Powers, and Gutkin (2020) called for an increased emphasis on models of psychological service delivery that are primarily indirect, adult-focused, and geared toward systems-level change in the schools. They asserted that research in school psychology should not focus on the problems of individual children and youth but address the…

This study examined adult perceptions of dyslexia among US adults. Participants (n = 623) answered survey questions pertaining to characteristics, views, and possible causes of DYS. Exploratory factor analysis revealed five distinct factors: (1) psychosocial causes, (2) external causes, (3) biological causes, (4) consequences, and (5)…

With the ever-increasing push towards authentic learning within post-secondary institutions, many approaches are being explored. One such method with a particular focus on real-world applications has been the International Genetically Engineered Machines (iGEM) competition program. At the University of Calgary, the iGEM program sees teams of…

According to models of differential susceptibility, the same neurobiological and temperamental traits that determine increased sensitivity to stress and adversity also confer enhanced responsivity to the positive aspects of the environment. Differential susceptibility models have expanded to include complex developmental processes in which genetic…

In this article, Peter Molenaar responds to three commentaries (this issue) on his article, "An Interpretation of Part of Gilbert Gottlieb's Legacy: Developmental Systems Theory Contra Developmental Behavior Genetics." He addresses aspects of relational developmental systems (RDS) mentioned and questions raised in each of the…

The emerging field of molecular epigenetics studies relatively stable changes in genetic activity that are not due to changes in the DNA sequence. Initial research results indicate a functional role for epigenetic mechanisms in neuron development and neuronal cell function. However, concepts that integrate these findings in an overall theory of…

Psychobiological systems theory is a relational approach to development that challenges the longstanding views that (1) genetic and environmental influences on the phenotype can be meaningfully partitioned and that (2) genes are capable of directly specifying phenotypes. Gilbert Gottlieb's theoretical innovations including the notion of…

The concepts and paradigms "development", "evolution", and "developmental behavior genetics" target, in their statements, populations. The laws of genetics and evolution are supposed to apply to every single case in a population. It can be counted among the major contributions of Gottlieb (1992, 1995) to have pointed…