Little is known about their stability and the factors that influence their persistence or change over the life-course. To address this, we use data from 158 participants from the Special Needs and Autism Project cohort studied at three time-points from 12 to 23 years. We used latent growth models to study the role of child, family, and contextual…

Background: Twin studies using both clinical and population-based samples suggest that the frequent co-occurrence of attention deficit hyperactivity disorder (ADHD) and reading ability/disability (RD) is largely driven by shared genetic influences. While both disorders are associated with lower IQ, recent twin data suggest that the shared genetic…

We examined the double-deficit hypothesis in Finnish. One hundred five Finnish children with high familial risk for dyslexia and 90 children with low family risk were followed from the age of 3 1/2 years until Grade 3. Children's phonological awareness, rapid naming speed, text reading, and spelling were assessed. A deficit in rapid automatized…

Impulsivity and inattention are key constructs at the interface of temperament and domains of childhood behavioral problems, such as ADHD and ODD. A multi-method, multi-source assessment of impulsivity and inattention was conducted with 256 families of twins at a mean age of 8-9 years from an epidemiologically defined community sample. Analysis of…

Objective: The main aim of this study was to examine the age-dependent remission from ADHD in girls transitioning through childhood into adolescence and early adulthood. Method: We conducted a 5-year prospective follow-up study of 123 girls with ADHD and 106 non-ADHD control girls aged between 6 and 17 years at ascertainment. ADHD was considered…

This study examines the need for programs for the disadvantaged child in Newfoundland, and illustrates what directions such programs must take to be effective. A sample was taken of 120 children in grades 1, 3, and 5 of two schools. The family background variables examined were father's and mother's occupation and education, the number of children…

The confluence model of cognitive development was tested on 7,060 children. Family size, sibling order within family sizes, and hypothesized age-dependent effects were tested. Findings indicated an inverse relationship between family size and the cognitive measures; age-dependent effects and other confluence variables were found to be…

Wechsler Intelligence Scale for Children--Revised scoring patterns of 197 Native American children (ages 6-16, 90 girls and 107 boys) at a Northern Plains boarding school were explored to identify characteristic cognitive processing strengths. Findings indicated greater strength than among standardization population in relational, holistic, right…

Examination of the Intelligence Quotient of 46 Black children, half of whom had been adopted by White families and half by Black families, reveals that it is not just the ethnicity of the family of rearing that influences the development of the child's skills, but also the ethnic milieu that surrounds the family. (BJV)