Background: Educational attainment is connected to many important life outcomes, and the previous research has already focused on identifying its genetic and environmental components. However, most of these studies used twin data only and did not incorporate information from other family members. Twin studies typically decompose the phenotypic…

Purpose: Reading and speech difficulties are common in childhood, yet it is not fully understood how much of their etiology is shared. This partly derives from methodological issues related to overlooking the potential co-occurrence between the two sets of difficulties. This study investigated the effects of five bioenvironmental predictors in a…

Students who exhibit behaviors commonly associated with Attention Deficit Hyperactivity Disorder (ADHD) are at risk for academic struggles and impaired relationships, often needing targeted interventions to be successful. While research supports the need for using interventions to improve classroom performance for students impacted by ADHD, it…

The course of 187 individuals ages 3-21 years with Autistic Disorder was traced through a period of 20 years (enrollment: 1995-1998, follow up: 2014-2019). Specific genetic and environmental causes were identified in only a minority. Intellectual disability coexisted in 84%. Few became independent with 99% living at home with relatives, in…

The high prevalence of mental health and behaviour problems among autistic children and adults is an issue of concern to the autism community. Many studies have been undertaken to identify the factors that protect against/or increase the risk of such difficulties. However, this research is dominated by quantitative observational studies. In this…

Autism spectrum disorders (ASD) are common heterogeneous neurodevelopmental disorders, characterized by disruptions in social interactions, communication, and limitations in behavior. Early diagnosis is an important step to prevent progression of ASD. Recent developments in genetic technology provide useful tools to investigate the molecular…

A risk to develop a learning disability has been shown to run in families. Having a positive family history of learning disability seems to account for mean differences in achievement outcomes (reading, math) in that children with a positive family history score significantly lower compared to their peers with no such family history. However, the…

Studies have identified concurrent, longitudinal, and bidirectional associations between language difficulties and internalizing problems. This is commonly explained by social exclusion or withdrawal from peers, but underlying mechanisms are not well understood. This study uses sibling data to investigate if the comorbidity between language…

Conduct disorder (CD) is a pattern of repeated aggression toward others, disregard for the rights of others, and behaviors that violate major social norms at home, in school, and even in society at large (American Psychiatric Association [APA], 2013). Falling under the umbrella of "conduct problems" along with oppositional defiant…

According to the hybrid model (van Bergen, van der Leij, & de Jong, 2014), the significant association among executive functioning (EF), reading, and math may be partially explained by parent-reported EF's role as a common risk and/or protective factor in reading and math (dis)abilities. The current study used a sample of 434 twin pairs…

The etiology of intelligence and learning difficulties is interpreted and perceived in different ways within society. The present study aims to explore the perceptions of a sample of n=501 Brazilian teachers regarding genetic and environmental influences on intelligence and learning difficulties. Using numerical scales, it was observed that…

There is considerable variability in the extent to which young people with developmental language disorder (DLD) experience mental health difficulties. What drives these individual differences remains unclear. In the current article, data from the Twin Early Development Study were used to investigate the genetic and environmental influences on…

Background: Despite a large body of research that has explored the influence of genetic and environmental factors on educationally relevant traits, few studies have explored teachers' beliefs about, or knowledge of, developments in behavioural genetics related to education. Aims: This study aimed to describe the beliefs and knowledge of UK…

The study utilized African theories, literatures, framework and a qualitative method with 11 heterosexual Nigerian undergraduate university students to explore their perceptions and attitudes towards homosexuality and LGB persons. The data analysis identified six categories: (a) higher tolerance observed for lesbians than gay men among…

The aim of this study was to disentangle pervasive from situational antisocial behaviors using multiple informants, and to investigate their genetic and environmental etiologies in preadolescence and across time. Antisocial behaviors were assessed in 2,232 twins from the Environmental Risk (E-Risk) Longitudinal Twin Study at ages 5 and 12.…