Professor Richard K Olson

Castles, A., Datta, H., Gayan, J., & Olson, R.K. (1999). Varieties of developmental reading disorder: Genetic and environmental influences. Journal of Experimental Child Psychology, 72, 73-94.

Wise, B.W., Ring, J., & Olson, R.K. (1999). Training phonological awareness with and without attention to articulation. Journal of Experimental Child Psychology, 72, 271-304.

Wadsworth, S.J., Olson, R.K., Pennington, B.F., & DeFries, J.C. (2000). Differential genetic etiology of reading disability as a function of IQ. Journal of Learning Disabilities., 33, 192-199.

Wise, B.W., Ring, J., & Olson, R.K. (2000). Individual differences in gains from computer-assisted remedial reading with more emphasis on phonological analysis or accurate reading in context. Journal of Experimental Child Psychology, 77, 197-235.

Willcutt, E.G., Pennington, B.F., Olson, R.K., Boada, R., Ogline, J., Tunick, R., & Chhabildas, N. (2001). A comparison of the cognitive deficits in reading disability and attention-deficit/hyperactivity disorder. Journal of Abnormal Psychology, 110, 157-172.

Smith, S.D., Kelley, P.M., Askew, J.W., Hoover, D.M., Deffenbacher, K.E., Gayan, J., Brower, A., & Olson, R.K. (2001). Reading disability and chromosome 6p21.3: Evaluation of MOG as a candidate gene. Journal of Learning Disabilities, 34, 512-519.

Davis, C.J., Gayan, J., Knopik, V.S., Smith, S.D., Cardon, L.R., Pennington, B.F., Olson, R.K., & DeFries, J.C. (2001). Etiology of reading difficulties and rapid naming: The Colorado Twin Study of Reading Disability. Behavior Genetics, 31 (6), 625-635.

Gayan, J., & Olson, R.K. (2001). Genetic and environmental influences on orthographic and phonological skills in children with reading disabilities. Developmental Neuropsychology, 20 (2), 487-511.

Davis, C.J., Knopik, V.S., Olson, R.K., Wadsworth, S.J., & DeFries, J.C. (2001). Genetic and environmental influences on rapid naming and reading ability: A twin study. Annals of Dyslexia, 51, 241-258.

Cross, R.J., Gayan, J., DeFries, J.C., and Olson, R.K. (2001). Differential genetic etiology of reading disability as a function of processing speed. Behavioral Genetics, 31, 450 (Abstract)

Davis, C.J., Gayan, J., Knopic, V.S., Smith, S.D., Cardon, L.R., Pennington, B.F., Olson, R.K., DeFries, J.C. (2001). Reading difficulties and rapid naming: Bivariate twin and genetic linkage analyses. Behavioral Genetics, 31, 451 (Abstract)

Compton, D.L., DeFries, J.C., & Olson, R.K. (2001). Are RAN and phonological awareness deficits additive in children with reading disabilities? Dyslexia, 7, 125-149.

Olson, R.K. & Datta, H. (2002). Visual-temporal processing in reading-disabled and normal twins. Reading and Writing, 15, 127-149.

Willcutt, E.G., Pennington, B.F., Smith, S.D., Cardon, L.R., Gayan, J., Knopic, V.S., Olson, R.K., & DeFries, J.C. (2002). Quantitative trait locus for reading disability on chromosome 6p is pleiotropic for attention-deficit/hyperactivity disorder. American Journal of Medical Genetics (Neuropsychiatric Genetics), 114, 260-268.

Fisher, S.E., Francks, C., Marlow, A.J., MacPhie, L., Williams, D.F., Cardon, Lon R., Ishikawa-Brush, Y., Talcott, J.B., Richardson, A.J., Gayan, J., Olson, R.K., Pennington, B.F., Smith, S.D., DeFries, J.C., Stein, J.F., & Monaco, A.P. (2002). Genome-wide scans in independent samples reveal strong convergent evidence for a chromosome 18 quantitative-trait locus influencing developmental dyslexia. Nature Genetics, 30, 86-91.

Franks, C., Fisher, S.E., Olson, R.K., Pennington, B.F., Smith, S.D., DeFries, J.C., & Monaco, A.P. (2002). Fine mapping of the chromosome 2p12-16 dyslexia susceptibility locus: Quantitative association analysis and positional candidate genes SEMA4F and OTX1. Psychiatric Genetics, 12, 35-41.

Kaplan, D.E., Gayan, J., Ahn, J., Won, T.W., Pauls, D., Olson, R., DeFries, J.C., Wood, F., Pennington, B., Page, G., Smith, S.D., & Gruen, J.R. (2002). Evidence for linkage and association with reading disability on 6P21.3-22. American Journal of Human Genetics, 70, 1287-1298.

Knopik, V.S., Smith, S.D., Cardon, L., Pennington, B., Gayan, J., Olson, R.K., & DeFries, J.C. (2002). Differential genetic etiology of reading component processes as a function of IQ. Behavior Genetics, 32, 181-198.

Compton, D.L., Olson, R.K., & DeFries, J.C., and Pennington, B.F. (2002). Are all RAN created equal? Comparing the relationships among two different formats of alphanumeric RAN and various word reading skills in normally achieving and reading disabled individuals. Scientific Studies of Reading, 6 (4), 343-368.

Boada, R., Willcutt, E.G., Tunick, R.A., Chhabildas, N.A., Olson, R.K., DeFries, J.C., & Pennington, B.F. (2002). A twin study of the etiology of high reading ability. Reading and Writing: An Interdisciplinary Journal, 15, 683-707.

Byrne, B., Delaland, C., Fielding-Barnsley, R., Quain, P., Samuelsson, S., Hoien, T., Corley, R., DeFries, J.C., Wadsworth, S., Willcutt, E., & Olson, R.K. (2002). Longitudinal twin study of early reading development in three countries: Preliminary results. Annals of Dyslexia, 52, 49-74.

Olson, R.K. (2002). Dyslexia: Nature and nurture. Dyslexia, 8, 143-159.

Cross, R.J., Davis, C.J., Rhee, S., Wadsworth, S.J., DeFries, J.C. & Olson, R.K. (2002). The effect of subtype classification methods on estimates of differential heritability (Abst). Behavior Genetics, 32, 462.

Davis, C.J., Fisher, S.E., Franks, C., MacPhie, I.L., Gayan, J., Smith, S.D., Cardon, L.R., Pennington, B.F., Olson, R.K., Monaco, A.P. & DeFries, J.C. (2002). Bivariate linkage analyses for reading difficulties and rapid naming (Abst.). Behavior Genetics, 32, 462.

Fisher, S.E., Franks, C., Marlow, A.F., MacPhie, I.L., Newbury, D.F., Cardon, L.R., Ishikawa-Brush, Y., Richardson, A.J., Talcott, J.B., Gayan, J., Olson, R.K., Pennington, B.F., Smith, S.D., DeFries, J.C., Stein, J.F., & Monaco, A.P. (2002). Quantitative trait analysis of the entire genome in large samples of dyslexia sib-pairs from the UK and US (Abst). Behavior Genetics, 32, 464.

Gayan, J.D., Kaplan, D.E., Ahn, J., Won, T.W., Pauls, D., Olson, R.K., DeFries, J.C., Wood, F., Pennington, B.F., Page, G.P., Smith, S.D., & Gruen, J.R. (2002). Fine mapping linkage and association analyses of reading disability in the 6p21.3-22 region (Abst.). Behavior Genetics, 32, 465-466.

Olson, R.K. (2002). Genetic and environmental influences on reading and related cognitive skills. Dyslexi, 4, 10-16.

Gayan, J., & Olson, R.K. (in press). Genetic and environmental influences on individual differences in printed word recognition. Journal of Experimental Child Psychology.

Recent Chapters:

Olson, R.K., Forsberg, H., Gayan, J., & DeFries, J.C. (1999). A behavioral-genetic analysis of reading disabilities and component processes. In R.M. Klein & P.A. McMullen (Eds.), Converging methods for understanding reading and dyslexia (pp. 133-153). Cambridge Mass.: MIT Press.

Olson, R.K. (2000). Genes, environment, and learning disabilities. In R. S. Sternberg and L. Spear-Swerling (Eds.), Perspectives on learning disabilities. Westview/Harper Collins.

Olson, R.K., & Gayan, J. (2001). Brains, Genes, and Environment in Reading Development. In S. Newman & D. Dickinson (Eds.). Handbook of early literacy development (pp. 81-96). New York: Guilford Publications, Inc.

Lyon, G.R., Fletcher, J.M., Shaywitz, S.E., Shaywitz, B.A., Torgesen, J.K., Wood, F.B., Schulte, A., & Olson, R.K. (2001). Rethinking learning disabilities. In C.E. Finn, A.J. Rotherham, & C.R. Hokanson Jr. (Eds.), Rethinking special education for a new century (pp. 259-287). Progressive Policy Institute and the Thomas B. Fordham Foundation.

Compton, D.L., Davis, C.J., DeFries, J.C., Gayan, J., & Olson, R.K. (2001). Genetic and environmental influences on reading and RAN: An overview of results from the Colorado Twin Study. In M. Wolf (Ed.), Conference proceedings of the Dyslexia Research Foundation Conference in Extraordinary Brain Series: Time, fluency, and developmental dyslexia (pp. 277-303). Baltimore MD: York Press.

Olson, R.K. (2002). Phoneme awareness and reading, from the old to the new millenium. In E. Hjelmquist and C. von Euler (Eds.), Dyslexia and literacy: A tribute to Ingvar Lundberg (pp. 100-116). London: Whurr Publishers.

Willcutt, E.G., DeFries, J.C., Pennington, B.F., Smith, S.D., Cardon, L.R., & Olson, R.K. (2003). Genetic etiology of comorbid reading difficulties and ADHD. In R. Plomin, J.C. DeFries, I.W. Craig, & P. McGuffin (Eds.), Behavioral Genetics in the Postgenomic Era (227-246). Washington D.C.: American Psychological Association.

Fletcher, J.M., Lyon, R., Barnes, M., Stuebing, K.K., Francis, D.J., Olson, R.K., Shaywitz, S.E., & Shaywitz, B.A. (2002). Classification of learning disabilities: An evidence based evaluation. In R. Bradley, L. Danielson, and D.P. Hallahan (Eds.), Identification of learning disabilities - research to practice (pp. 185-250). Mahwah, NJ: Erlbaum.

Olson, R.K. (in press). Genetic?? and environmental influences on the development of reading and related cognitive skills. In R.M. Joshi & P.G. Aaron (Eds.), Handbook of Orthography and Literacy. Mahwah, NJ: Laurence Erlbaum Associates.