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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
Olson, Richard K.; Hulslander, Jacqueline; Christopher, Micaela; Keenan, Janice M.; Wadsworth, Sally J.; Willcutt, Erik G.; Pennington, Bruce F.; DeFries, John C. – Annals of Dyslexia, 2013
Identical and fraternal twins (N = 540, age 8 to 18 years) were tested on three different measures of writing (Woodcock-Johnson III Tests of Achievement--Writing Samples and Writing Fluency; Handwriting Copy from the Group Diagnostic Reading and Aptitude Achievement Tests), three different language skills (phonological awareness, rapid naming, and…
Descriptors: Measurement, Achievement Tests, Genetics, Word Recognition
Olson, Richard K.; Keenan, Janice M.; Byrne, Brian; Samuelsson, Stefan; Coventry, William L.; Corley, Robin; Wadsworth, Sally J.; Willcutt, Erik G.; DeFries, John C.; Pennington, Bruce F.; Hulslander, Jacqueline – Scientific Studies of Reading, 2011
Genetic and environmental relations between vocabulary and reading skills were explored longitudinally from preschool through Grades 2 and 4. At preschool there were strong shared-environment and weak genetic influences on both vocabulary and print knowledge but substantial differences in their source. Separation of etiology for vocabulary and…
Descriptors: Reading Comprehension, Genetics, Word Recognition, Etiology
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
Johnson, Erin Phinney; Pennington, Bruce F.; Lowenstein, Joanna H.; Nittrouer, Susan – Journal of Communication Disorders, 2011
Research Design;Intervention;Biology;Biotechnology;Teaching Methods;Hands on Science;Professional Development;Comparative Analysis;Genetics;Evaluation;Pretests Posttests;Control Groups;Science Education;Science Instruction;Pedagogical Content Knowledge;
Descriptors: Sentences, Cues, Written Language, Economically Disadvantaged
Arnett, Anne B.; Pennington, Bruce F.; Friend, Angela; Willcutt, Erik G.; Byrne, Brian; Samuelsson, Stefan; Olson, Richard K. – Journal of Attention Disorders, 2013
Objective: The Strengths and Weaknesses of ADHD Symptoms and Normal Behavior (SWAN) Rating Scale differs from previous parent reports of ADHD in that it was designed to also measure variability at the positive end of the symptom spectrum. Method: The psychometric properties of the SWAN were tested and compared with an established measure of ADHD,…
Descriptors: Attention Deficit Hyperactivity Disorder, Symptoms (Individual Disorders), Behavior Rating Scales, Psychometrics
Boada, Richard; Willcutt, Erik G.; Pennington, Bruce F. – Topics in Language Disorders, 2012
Dyslexia and attention-deficit/hyperactivity disorder (ADHD) are 2 of the most prevalent complex neurodevelopmental disorders of childhood, each affecting approximately 5% of the population in the United States. These disorders are also each comorbid with speech sound disorder and language impairment. Understanding the nature of the comorbidity…
Descriptors: Attention Deficit Hyperactivity Disorder, Dyslexia, Children, Comorbidity
Smith, Shelley D.; Pennington, Bruce F. – Learning Disabilities: An Interdisciplinary Journal, 1983
A discussion of basic genetic principles is followed by a review of selected genetic syndromes involving learning disabilites (such as Noonan Syndrome, Neurofibromatosis, Pheuylketonuria, and cleft lip and palate). Guidelines for securing a genetic evaluation are given. (CL)
Descriptors: Clinical Diagnosis, Elementary Secondary Education, Genetics, Learning Disabilities
Willcutt, Erik G.; Betjemann, Rebecca S.; Wadsworth, Sally J.; Samuelsson, Stefan; Corley, Robin; DeFries, John C.; Byrne, Brian; Pennington, Bruce F.; Olson, Richard K. – Reading and Writing: An Interdisciplinary Journal, 2007
Numerous studies have examined the etiology of the association between reading difficulties and attention-deficit hyperactivity disorder (ADHD) in school-age children, but little is known about the relation between prereading skills and ADHD behaviors prior to the beginning of formal reading instruction. A population-based sample of 809 pairs of…
Descriptors: Reading Difficulties, Reading Instruction, Etiology, Twins
Peer reviewedPennington, Bruce F.; Smith, Shelley D. – Journal of Consulting and Clinical Psychology, 1988
Reviews genetic influences on learning disabilities, discussing recent advances in molecular genetics that have made linkage analysis a more powerful tool for studying the genetics of behavioral phenotypes. Also examines what is known about genetic influences in two familial disorders, developmental dyslexia and Tourette syndrome. (Author/NB)
Descriptors: Children, Cognitive Development, Dyslexia, Elementary Secondary Education
Smith, Shelley D.; Pennington, Bruce F. – Learning Disabilities: An Interdisciplinary Journal, 1983
Research in the genetics of behavioral traits, undertaken by family studies, twin studies, and adoption studies, has revealed information on normal variation in cognitive abilities as well as specific learning disabilities (primarily dyslexia). Genetic evaluation of learning disabled students have implications for counseling and recurrence risk…
Descriptors: Behavior Patterns, Clinical Diagnosis, Evaluation Methods, Genetics
Peer reviewedPennington, Bruce F. – Annals of Dyslexia, 1989
Genetic research has shown that dyslexia is familial, substantially heritable, and heterogeneous in its genetic mechanisms. Evidence also supports the view that the primary symptom in dyslexia is a deficit in the phonological coding of written language, a symptom that appears to be heritable. (Author/JDD)
Descriptors: Dyslexia, Genetics, Heredity, Nature Nurture Controversy
Pennington, Bruce F.; Snyder, Kelly A.; Roberts, Ralph J., Jr. – Developmental Review, 2007
This commentary explains how the field of developmental cognitive neuroscience (DCN) holds the promise of a much wider interdisciplinary integration across sciences concerned with development: psychology, molecular genetics, neurobiology, and evolutionary developmental biology. First we present a brief history of DCN, including the key theoretical…
Descriptors: Genetics, Developmental Psychology, Molecular Biology, Interdisciplinary Approach
Doyle, Alysa E.; Faraone, Stephen V.; Seidman, Larry J.; Willcutt, Erik G.; Nigg, Joel T.; Waldman, Irwin D.; Pennington, Bruce F.; Peart, Joanne; Biederman, Joseph – Journal of Child Psychology and Psychiatry, 2005
Background: Behavioral genetic studies provide strong evidence that attention-deficit/hyperactivity disorder (ADHD) has a substantial genetic component. Yet, due to the complexity of the ADHD phenotype, questions remain as to the specific genes that contribute to this condition as well as the pathways from genes to behavior. Endophenotypes, or…
Descriptors: Attention Deficit Hyperactivity Disorder, Genetics, Cognitive Processes, Neurological Impairments
Peer reviewedPennington, Bruce F.; And Others – Journal of Learning Disabilities, 1992
This study of 640 twins with reading disability and 436 controls (mean age 12) examined external validity of the distinction between specific reading retardation and reading backwardness, in 3 domains: genetic etiology, sex ratio and clinical correlates, and neuropsychological profiles. There was no evidence of differential genetic etiology of the…
Descriptors: Age Differences, Definitions, Educational Diagnosis, Elementary Secondary Education
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