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Direct linkWillcutt, Erik G.; McGrath, Lauren M.; Pennington, Bruce F.; Keenan, Janice M.; DeFries, John C.; Olson, Richard K.; Wadsworth, Sally J. – New Directions for Child and Adolescent Development, 2019
Current definitions of specific learning disability (SLD) identify a heterogeneous population that includes individuals with weaknesses in reading, math, or writing, and these academic difficulties often co-occur in many of the same individuals. The Colorado Learning Disabilities Research Center (CLDRC) is an interdisciplinary, multisite research…
Descriptors: Comorbidity, Learning Disabilities, Twins, Reading Difficulties
Rosenberg, Jenni; Pennington, Bruce F.; Willcutt, Erik G.; Olson, Richard K. – Journal of Child Psychology and Psychiatry, 2012
Background: Reading disability (RD) and attention deficit/hyperactivity disorder (ADHD) are comorbid and genetically correlated, especially the inattentive dimension of ADHD (ADHD-I). However, previous research indicates that RD and ADHD enter into opposite gene by environment (G x E) interactions. Methods: This study used behavioral genetic…
Descriptors: Attention Deficit Hyperactivity Disorder, Twins, Learning Disabilities, Genetics
Olson, Richard K. – Annals of Dyslexia, 2006
This article presents an overview of some methods and results from our continuing studies of genetic and environmental influences on dyslexia, and on individual differences across the normal range that have been conducted over the past 25 years in the Colorado Learning Disabilities Research Center (CLDRC) and in related projects. CLDRC…
Descriptors: Early Reading, Environmental Influences, Family Environment, Learning Disabilities
Peer reviewedDeFries, J. C.; And Others – Learning Disabilities: A Multidisciplinary Journal, 1997
Results obtained from the center's six research projects are reviewed, including research on psychometric assessment of twins with reading disabilities, reading and language processes, attention deficit-hyperactivity disorder and executive functions, linkage analysis and physical mapping, computer-based remediation of reading disabilities, and…
Descriptors: Attention Deficit Disorders, Children, Computer Uses in Education, Exceptional Child Research
