Sally J. Wadsworth, PhD.

Publications

Articles and Book Chapters:

Wadsworth, S.J., Gillis, J.J., DeFries, J.C. & Fulker, D.W. (1989).  Differential genetic aetiology of reading disability as a function of age. The Irish Journal of Psychology, 10, 509-520.

DeFries, J.C., Wadsworth, S.J. & Gillis, J.J. (1990). Gender differences in cognitive abilities of reading-disabled twins. Annals of Dyslexia, 40, 216-228.

DeFries, J.C., Stevenson, J., Gillis, J.J. & Wadsworth, S.J. (1991). Genetic etiology of spelling deficits in the Colorado and London twin studies of reading disability. Reading and Writing: An Interdisciplinary Journal, 3, 271-283.

Wadsworth, S.J., DeFries, J.C., Stevenson, J., Gilger, J.W. & Pennington, B.F. (1992). Gender ratios among reading-disabled children and their siblings as a function of parental impairment. Journal of Child Psychology and Psychiatry, 33, 1229-1239.

DeFries, J.C., Gillis, J.J. & Wadsworth, S.J. (1993). Genes and genders: A twin study of reading disability. In A. M. Galaburda (ed.) Dyslexia and Development: Neurobiologic aspects of extra-ordinary brains. Cambridge, MA: Harvard University Press.

Wadsworth, S.J., DeFries, J.C. & Fulker, D.W. (1993). Cognitive abilities of children at 7 and 12 years of age in the Colorado Adoption Project. Journal of Learning Disabilities, 26, 611-115.

Wadsworth, S.J. (1994). School achievement. In J.C. DeFries, R. Plomin &  D.W. Fulker (eds.)  Nature and nurture during middle childhood. Oxford: Blackwell.

Wadsworth, S.J., DeFries, J.C., Fulker, D.W. &  Plomin, R. (1995). Covariation among measures of cognitive ability and academic achievement in the Colorado Adoption Project: Sibling analysis.  Personality and Individual Differences, 18, 63-73.

Wadsworth, S.J., DeFries, J.C., Fulker, D.W. & Plomin, R. (1995). Cognitive ability and academic achievement in the Colorado Adoption Project: A multivariate analysis of parent-offspring and sibling data. Behavior Genetics, 25, 1-15.

Wadsworth, S.J., DeFries, J.C., Pennington, B.F. & Olson, R.K. (1995). Reading performance and verbal short-term memory: A twin study of reciprocal causation. Intelligence, 20, 145-167.

Wadsworth, S.J., Corley, R.P., DeFries, J.C., Fulker, D.W., Carey, G. & Plomin, R. (1997).  Substance experimentation in the Colorado Adoption Project. Personality and Individual Differences, 23, 463-471.

DeFries, J.C., Knopik, V.S. & Wadsworth, S.J. (1999).  Colorado twin study of reading disability. In D.D. Duane (ed.) Reading and attention disorders: neurobiological correlates. Baltimore, MD, York Press Inc.

Wadsworth, S.J., Fulker, D.W. & DeFries, J.C. (1999).  Stability of genetic and environmental influences on reading performance at 7 and 12 years of age in the Colorado Adoption Project. International Journal of Behavioral Development, 23, 319-332.

Davis, C.J., Knopik, V.S., Wadsworth, S.J., & DeFries, J.C. (2000).  Self-reported reading problems in parents of twins with reading difficulties.  Twin Research,3, 88-91

Wadsworth, S.J., Knopik, V.S. & DeFries, J.C. (2000).  Reading disability in boys and girls: No evidence for a differential genetic etiology. Reading and Writing: An Interdisciplinary Journal, 13, 133-145.

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.

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, 231-247.

Wadsworth, S.J., Corley, R., Hewitt, J.K. & DeFries, J.C. (2001).  Stability of genetic and environmental influences on reading performance at 7, 12 and 16 years of age in the Colorado Adoption Project.  Behavior Genetics, 31, 353-359.

Byrne, B., Delaland, C., Fielding-Barnsley, R., Quain, P., Samuelsson, S., Høien, 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, 49-73.

Wadsworth, S.J., Corley, R.P., Hewitt, J.K., Plomin, R. & DeFries, J.C. (2002).  Reading performance at 7, 12 and 16 years of age in the Colorado Adoption Project: Parent-offspring analyses.  Journal of Child Psychology and Psychiatry, 43, 769-774.

Wadsworth, S.J., Davis, C.J., Knopik, V.S., Willcutt, E.G. & DeFries, J.C. (2002).  Genetics of reading disabilities.  In I. Arcolini & G. Zardini (Eds.), I disturbi di apprendimento della lettura e della scrittura (pp. 23-35).  Milano:  Franco Angeli.

Wadsworth, S.J. & DeFries, J.C. (2003).  Etiology of the stability of reading performance from 7 to 12 years of age and its possible mediation by IQ.  In S.A. Petrill, J.K. Hewitt, R. Plomin & J.C. DeFries (eds.)  Nature, nurture and the transition to early adolescence. New York: Oxford University Press.

Hulslander, J., Talcott, J., Witton, C. DeFries, J., Pennington, B., Wadsworth, S., Willcutt, E. & Olson, R. (2004). Sensory processing, reading, IQ, and attention.  Journal of Experimental Child Psychology, 88, 274-295.

Tiu, R.D., Jr., Wadsworth, S.J., DeFries, J.C. & Olson, R.K. (2004).  Causal models of reading disability: A twin study.  Twin Research, 7, 275-283.   

Byrne, B., Wadsworth, S., Corley, R., Samuelsson, S., Quain, P., DeFries, J.C., Willcutt, E. & Olson, R.K. (2005).  Longitudinal twin study of early literacy development: Preschool and kindergarten phases.  Scientific Studies of Reading, 9, 219-235.

Samuelsson, S., Byrne, B., Quain, P., Wadsworth, S., Corley, R., DeFries, J., Willcutt, E., & Olson, R. (2005). Environmental and Genetic Influences on Prereading Skills in Australia, Scandinavia, and the United States. Journal of Educational Psychology, 97, 705-722.

Wadsworth, S.J. & DeFries, J.C. (2005).  Genetic etiology of reading difficulties in boys and girls. Twin Research and Human Genetics, 8, 594-601.

Bricker, J.B., Stallings, M.C., Corley, R.P., Wadsworth, S.J., Bryan, A., Timberlake, D., Hewitt, J.K., Caspi, A., Hofer, S.M., Rhea, S.A., & DeFries, J.C. (2006).  Genetic and environmental influences on age at sexual initiation in the Colorado Adoption Project. Behavior Genetics, 36, 820-832.

Byrne, B., Olson, R. K., Samuelsson, S., Wadsworth, S., Corley, R., DeFries, J.C., & Willcutt, E. (2006). Genetic and environmental influences on early literacy. Journal of Research in Reading, 29, 33-49.

Hawke, J.L., Wadsworth, S.J., & DeFries, J.C. (2006).  Genetic influences on reading difficulties in boys and girls: The Colorado Twin Study.  Dyslexia: An international journal of research and  practice,12, 21-29.

Keenan, J.M., Betjemann, R., Wadsworth, S.J., DeFries, J.C. & Olson, R.K. (2006). Genetic and Environmental Influences on Reading and Listening Comprehension.  Journal of Research inReading, 29, 75-91.

Wadsworth, S.J., Corley, R.P., Plomin, R., Hewitt, J.K. & DeFries, J.C. (2006).  Genetic andenvironmental influences on continuity and change in reading achievement in the Colorado Adoption Project.  In A. Huston & M. Ripke (Eds.) Developmental contexts of middle childhood:Bridges to adolescence and adulthood (pp. 87-106).  New York: Cambridge University Press.

Astrom, R. L., Wadsworth, S.J. & DeFries, J.C. (2007). Etiology of the stability of reading difficulties: The Longitudinal Twin Study of Reading Disabilities. Twin Research and Human Genetics, 10, 434-439.

Byrne, B., Samuelsson, S., Wadsworth, S., Hulslander, J., Corley, R., DeFries, J.C., Quain, P., Willcutt, E.G., and Olson, R.K. (2007).  Longitudinal twin study of early literacy development: Preschool through Grade 1. Reading and Writing: An Interdisciplinary Journal, 20, 77-102.

Friend, A., DeFries, J.C., Wadsworth, S.J. & Olson, R.K. (2007) . Genetic and Environmental Influences on Word  Recognition and Spelling Deficits as a Function of Age.  Behavior Genetics, 37, 477-486.

Hawke, J.L., Wadsworth, S.J., Olson, R.K. & DeFries, J.C. (2007). Etiology of reading difficulties as function of gender and severity. Reading and Writing: An Interdisciplinary Journal, 20, 13-25.

Samuelsson, S., Byrne, B., Quain, P., Wadsworth, S., Corley, R., DeFries, J., Willcutt, E., Hulslander, J., & Olson, R. (2007). Genetic and environmental influences on pre-reading skills and early reading and spelling development in the the United States, Australia, and Scandinavia. Reading and Writing: An Interdisciplinary Journal, 20, 51-75.

Wadsworth, S.J., DeFries, J.C., Olson, R.K., & Willcutt, E.G. (2007). Colorado Longitudinal Twin Study of Reading Disabilities. Annals of Dyslexia. 57, 139-160.

Willcutt, E.G., Betjemann, R.S., Wadsworth, S.J., Samuelsson, S.,  Corley, R., DeFries, J.C., Byrne, B., Pennington, B.F., & Olson, R.K. (2007).  Preschool twin study of the relation between attention-deficit/hyperactivity disorder and prereading skills. Reading and Writing: An Interdisciplinary Journal, 20, 103-125.

Willcutt, E.G., Betjemann, R.S., Pennington, B.F., Olson, R.K., DeFries, J.C. & Wadsworth, S.J. (2007). Longitudinal study of reading disability and attention-deficit/hyperactivity disorder: Implications for education. Mind, Brain and Education, 1, 181-192.

Betjemann, R.S., Willcutt, E.G., Olson, R.K., Keenan, J.M., DeFries, J.C., & Wadsworth, S.J. (2008). Etiology of the stability of reading comprehension and its relation with word reading.  Reading and Writing: An Interdisciplinary Journal. Online First.

http://www.springerlink.com/content/h76750x1t347m6x8/?p=3f1e068aa0e04748bd819f0105ecd2f9&pi=6.

Hawke, J., Stallings, M.C., Wadsworth,  S.J. & DeFries, J.C. (in press).  DeFries-Fulker and Pearson-Aitkin model-fitting analyses of reading performance data from selected and unselected twin pairs. Behavior Genetics.

Earlier publications:

Kresovich, S., McGee, R.E., Wadsworth, S.J., Panella, . L.W., Reilley, A.A. & Miller, F.R.  (1988). Application of cell and tissue culture techniques for the genetic improvement of Sorghum bicolor (L.) Moench: progress and potential.  Advances in Agronomy, 41, 147-170.

Kresovich, S., McGee, R.E., & Wadsworth, S.J. (1987). In vitro genotypic responses of sweet sorghum to the synthetic auxins, 2,4-D and picloram. Sorghum Newsletter 29, 94-96.

Kresovich, S., Wadsworth, S.J., Molina, J.J. & McGee, R.E. (1986).  Salinity tolerance of interspecific hybrids of Saccharum spp.: Ranges and mechanisms of adaptation exhibited in cellular suspensions of commercial cultivars. International Society of Sugar Cane Technologists,19, 245-251.

Kresovich, S., McGee, R.E. & Wadsworth, S.J. (1985).  Comparisons of in vitro responsiveness of callus cultures derived from immature inflorescence and leaf base tissues of two interspecific hybrids of sugar cane (Saccarum spp.). Sugar Cane: International Journal of Cane Agriculture, 4, 5-8.

Abstracts:

Wadsworth, S. J. & Cain, R. E. (1980). The use of EMG biofeedback in the treatment of heterotropia: A case study (Abstract). Biofeedback and Self-Regulation, 5, 370.

Wadsworth, S. J. & Cain, R. E. (1981). EMG feedback for heterotropia: two case studies (Abstract). Biofeedback and Self-Regulation, 6, 426-427.

Kresovich. S., McGee R.E. & Wadsworth, S.J. (1985). In vitro genotypic responses of sweet sorghum to 2,4-dichlorophenoxyacetic acid and 4-amino-3,5,6-trichloropicolinic acid (Abstract).  In Vitro Cellular & Developmental Biology, 21, A35.

Wadsworth, S.J., Gillis, J.J., DeFries, J.C. & Fulker, D.W. (1990). Genetic aetiology of reading disability as a function of age (Abstract). Behavior Genetics, 20, 752.

Wadsworth, S.J. &  DeFries, J.C. (1991). Genetic and environmental correlations between reading and verbal memory (Abstract). Behavior Genetics, 21, 594.

Wadsworth, S.J., DeFries, J.C., Pennington, B.F. & Olson, R.K. (1992). Reading performance and verbal short-term memory: A twin study of reciprocal causation (Abstract). Behavior Genetics, 22, 760

Wadsworth, S.J. & DeFries, J.C. (1993). Etiology of covariation among measures of IQ and academic achievement (Abstract). Behavior Genetics, 23, 568.

Harris, K.N., Wadsworth, S.J. & Corley, R.P. (1995).  Early academic achievement and adolescent substance abuse.  Poster presented to the NIMH Career Opportunities in Research Education and Training annual meeting, November 2-6, San Juan, Puerto Rico.

Norflin, E.L., Corley, R.P. & Wadsworth, S.J. (1995).  Family and peer influences on substance experimentation.  Poster presented to the NIMH Career Opportunities in Research Education and Training annual meeting, November 2-6, San Juan, Puerto Rico.

Corley, R.P. & Wadsworth, S.J. (1995). Preliminary investigation of parental influences on age at first experimentation with illicit substances in the Colorado Adoption Project (Abstract). Behavioral Genetics, 25, 260.

Wadsworth, S.J. & Corley, R.P. (1995). Substance use in the Colorado Adoption Project (Abstract). Behavioral Genetics, 25, 293.

Wadsworth, S.J., Olson, R.K., Pennington, B.F. & DeFries, J.C. (1998).  Differential genetic etiology of reading disability as a function of IQ (Abstract). Behavior Genetics, 28, 483-484.

Davis, C.J., Knopik, V.S., Wadsworth, S.J., & DeFries, J.C. (1999). Etiology of the relationship between reading performance and rapid automatic naming: A twin study (Abstract).  Behavior Genetics, 29, 353.

Wadsworth, S.J., Plomin, R. & DeFries, J.C. (1999). Etiology of the stability of reading performance from 7 to 12 years of age in the Colorado Adoption Project (Abstract). Behavior Genetics, 29, 373.

Wadsworth, S.J., Corley, R., Hewitt, J.K. & DeFries, J.C. (2000).  Stability of Genetic and environmental influences on reading performance from 7 to 16 years of age in the Colorado Adoption Project (Abstract).  Behavior Genetics, 30, 421.

Corley, R.P. & Wadsworth, S. (2000).  Longitudinal and developmental analysis of general cognitive ability and school performance:  A sibling study (Abstract).  Behavior Genetics, 30, 400-401.

Wadsworth, S.J., Corley, R.P., Hewitt, J.K., Plomin, R. & DeFries, J.C. (2001).  Reading performance at 7, 12 and 16 years of age in the Colorado Adoption Project: Parent-offspring analyses (Abstract).  Behavior Genetics, 31, 473.

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 (Abstract).  Behavior Genetics, 32, 462.

DeFries, J.C. & Wadsworth, S.J. (2004).  Colorado Twin Study of Reading Disabilities (Abst.). Behavior Genetics,34, 635-636.

Wadsworth, S. J. & DeFries, J.C. (2004).  Genetic influences on reading disability as a function of gender (Abst.). Behavior Genetics,34, 664.

Hawke, J.L., Wadsworth, S.J., & DeFries, J.C. (2005).  Genetic influences on reading difficulties in boys and girls (Abst.), Behavior Genetics, 35, 804-805.

Astrom, R. L., Wadsworth, S.J. & DeFries, J.C. (2006). Etiology of the stability of reading difficulties: Preliminary analysis of follow-up data from participants in the Colorado Learning Disabilities Research Center (Abst.).  Behavior Genetics, 36,  954.

Betjemann, R.S., Willcutt, E.G., Olson, R.K., Keenan, J.M., DeFries, J.C., & Wadsworth, S.J. (2006). A preliminary investigation of the genetic etiology of reading comprehension over time (Abst.).  Behavior Genetics, 36, 956.

Friend, A., DeFries, J.C., Wadsworth, S.J., & Olson, R.K. (2006). Developmental differences in the genetic etiology of reading and spelling disabilities (Abst.). Behavior Genetics, 36, 964.

Stallings, M.C., Wadsworth, S.J., Corley, R.P., Button, T.M.M., Rhea, S.A., Hewitt, J.K., Plomin, R., DeFries, J.C. (2007).  Findings from the Colorado Adoption Project (Abst.). Behavior Genetics, 37, 796.

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