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FRIMED-Klinisk medisin og folkehelse

Genetic and environmental influences on reading development and reading disability: A longitudinal twin study

Tildelt: kr 2,1 mill.

Prosjektnummer:

170988

Søknadstype:

Prosjektperiode:

2006 - 2010

Geografi:

The proposed research will complete the first international longitudinal twin study of genetic and environmental influences on pre-reading and early reading and related skills from preschool (age 5) through the end of kindergarten, 1st, and 2nd grades, wh en children "learn to read", and at the end of 4th grade, when children "read to learn." The twin data will be used to explore the genetic and environmental etiology of critical prereading skills in preschoolers, as well as genetic and environmental links between preschool behavior and subsequent reading and related development in the early grades. Specifically, the project in Norway will: 1. Complete preschool ascertainment and testing of a total of 100 Norwegian five-year-old identical twin pairs. 2. C omplete follow-up testing of the twin pairs on reading and related cognitive skills at the end of kindergarten, first, and second grade, to provide a longitudinal perspective while children are "learning to read". 3. Extend the longitudinal design to the end of the 4th grade with increased emphasis on the twins? listening comprehension, reading comprehension, and print exposure, when the children are "reading to learn". 4. Collect ratings of DSM-IV attention/hyperactivity disorder (ADHD) from parents, te achers, and testers to assess the etiology of the relation between individual differences in early reading development, attentional functioning, and activity level. 5. Assess the phenotypic relations among results from enviornmental measures, cognitive me asures, preschool print knowledge, reading and spelling measures, and measures of attention at each test time and across test time. 6. Compare similarities within monozygotic and dizygotic twin pairs to assess the genetic, shared environmental, and non-sh ared environmental influences on individual differences in the various measures.

Budsjettformål:

FRIMED-Klinisk medisin og folkehelse