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Showing all 6 results
Direct linkOlson, 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
Peer reviewedPennington, Bruce F. – Annals of Dyslexia, 2003
This speech by a researcher into the genetic bases of dyslexia, attention deficit hyperactivity disorder (ADHD), and their etiological overlap, first honors four pioneers in the field (Samuel Orton, Bertil Hallgren, Isabelle Liberman, and Norman Geschwind); then updates knowledge about the genetics of dyslexia and comorbidity with ADHD and certain…
Descriptors: Attention Deficit Disorders, Dyslexia, Elementary Secondary Education, Etiology
Peer reviewedTunick, Rachel A.; Pennington, Bruce F. – Annals of Dyslexia, 2002
A twin study involving 808 children with reading disability (RD) and 455 children with phonological disorder (PD) found each were heritable on their own. Further, even when correcting for RD, the two disorders were found to be co-heritable, indicating co-familiarity is at least partially driven by genetic influences. (Contains references.)…
Descriptors: Biological Influences, Cognitive Processes, Dyslexia, Elementary Secondary Education
Peer reviewedPennington, Bruce F.; And Others – Annals of Dyslexia, 1987
Two studies involving 215 subjects tested the hypothesis that orthographic coding bypasses phonological coding after the early stages of reading or spelling. It was found that nondyslexics continue to develop phonological coding skill until adulthood and rely on it for reading and spelling to a significantly greater extent than do dyslexics.…
Descriptors: Beginning Reading, Child Development, Decoding (Reading), Dyslexia
Peer reviewedLefly, Dianne L.; Pennington, Bruce F. – Annals of Dyslexia, 1991
Two studies compared intelligence quotient, reading achievement test results, and spelling errors in 57 adult dyslexics, 56 adult nondyslexics, and 25 adult compensated dyslexics. Results suggest that compensated dyslexics appear very similar to nondyslexics in their reading and spelling skills; however, there is a difference in the automaticity…
Descriptors: Adults, Comparative Analysis, Dyslexia, Individual Characteristics
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
