The present study examined genetic and shared environment contributions to quantitatively-measured autism symptoms and categorically-defined autism spectrum disorders (ASD). Participants included 568 twins from the Interactive Autism Network. Autism symptoms were obtained using the Social Communication Questionnaire and Social Responsiveness…

While there is a strong sex bias in the presentation of autism, it is unknown whether this bias is also present in subclinical manifestations of autism among relatives, or the broad autism phenotype. This study examined this question and investigated patterns of co-occurrence of broad autism phenotype traits within families of individuals with…

Background: Internalizing and externalizing problem behavior at school can have major consequences for a child and is predictive for disorders later in life. Teacher ratings are important to assess internalizing and externalizing problems at school. Genetic epidemiological studies on teacher-rated problem behavior are relatively scarce and the…

Two studies of twin, sibling, and cousin pairs among children attempted to extend a model, called DF analysis, which separates hereditary and shared environmental influences. First study supported the validity of DF analysis applied to kinship height and weight data. The second study showed that spanking, reading, and quality of home environment…

This report was prepared to provide recommendations for testing adult dyslexics for employment purposes. Since the literature on dyslexia does not deal directly with this topic, the recommendations are based primarily on inferences from what is known about the diagnosis, etiology and treatment of dyslexia in children. A summary of the major…

The second of two volumes, this book contains 21 studies of children and families. Selections, grouped into three sections, are intended to provide a representative sample of current research, including case studies and less formal reports. The first section reports on families in distress. Articles focus on adults who were antisocial children,…