John C DeFries

Abstracts

DeFries, J.C., Touchberry, R.W., & Hays, R.L. (1958). Heritability of gestation length in dairy cattle. Journal of Dairy Science, 41, 745. (Abstract)

DeFries, J.C., & Touchberry, R.W. (1962). Genetic effects of radiation on egg production of Drosophila melanogaster. Genetics, 47, 950. (Abstract)

DeFries, J.C., & Touchberry, R.W. (1963). Genetic effects of ?-irradiation on the percent adult emergence of Drosophila melanogaster. Proceedings of the XI International Congress of Genetics, 1, 77. (Abstract)

DeFries, J.C. (1964). Effects of prenatal maternal stress on behavior in mice: A genotype-environment interaction. Genetics, 50, 244. (Abstract)

Hegmann, J.P., & DeFries, J.C. (1967). Open-field behavior in mice: A quantitative genetic analysis. Genetics, 56, 563-564. (Abstract)

DeFries, J.C., & Hegmann, J.P. (1968). Open-field behavior in mice: The response to selection. Proceedings of the XII International Congress of Genetics, Tokyo, August, 1968, 1, 288. (Abstract)

Hegmann, J.P., & DeFries, J.C. (1968). Genetic analysis of principal component scores derived from genetic, phenotypic, and environmental variance-covariance matrices. Genetics, 60, 188. (Abstract)

Klein, T.W., & DeFries, J.C. (1968). Taste sensitivity to phenylthiourea (PTC) in inbred strains of mice. Genetics, 60, 193. (Abstract)

Klein, T.W., & DeFries, J.C. (1969). Genetic analysis of taste sensitivity to phenylthiourea (PTC) in inbred strains of mice. Genetics, 61, S33-3. (Abstract)

DeFries, J.C. (1973). The heritable nature of group differences as a function of the within-group heritability. Behavior Genetics, 3, 199-200. (Abstract)

Foch, T., DeFries, J.C., & Singer, S.M. (1975). Specific reading disability: A family study. Behavior Genetics, 5, 96. (Abstract)

Lewitter, F., DeFries, J.C., & Singer, S.M. (1975). Family resemblance in reading ability: Path analysis. American Journal of Physical Anthropology, 42, 314. (Abstract)

Foch, T.T., & DeFries, J.C. (1976). Specific reading disability: Discrimination among affected and control index cases and their relatives. Behavior Genetics, 6, 106. (Abstract)

Lewitter, F., & DeFries, J.C. (1976). Parent-offspring resemblance in reading ability. Behavior Genetics, 6, 111-112. (Abstract)

Wilson, J.R., DeFries, J.C., & Johnson, R.C. (1976). Familial resemblances for specific cognitive abilities in three ethnic groups. Excerpta Medica, International Congress Series, No. 397, 196-197. (Abstract)

Kuse, A.R., & DeFries, J.C. (1977). Familial resemblance for the WAIS and for cognitive factor scores in Hawaii. Behavior Genetics, 7, 72. (Abstract)

Lewitter, F.I., & DeFries, J.C. (1977). Genetics of reading disability: Segregation analysis. Behavior Genetics, 7, 74. (Abstract)

Lewitter, F.I., DeFries, J.C., & Singer, S.M. (1977). Path analysis of reading ability in families of reading disabled and control children. American Journal of Physical Anthropology, 47, 145-146. (Abstract)

DeFries, J.C., & Kuse, A.R. (1978). Sex linkage: An alternative test. Behavior Genetics, 8, 543-544. (Abstract)

Johnson, R.C., DeFries, J.C., Ahern, F.M., & Mi, M.P. (1978). Resemblance of collateral relatives in cognitive abilities. Behavior Genetics, 8, 102. (Abstract)

Plomin, R., DeFries, J.C., Rowe, D.C., & Rosenman, R. (1978). Genetic and environmental influences on human behavior: Multivariate analysis. Behavior Genetics, 8, 110-111. (Abstract)

Corley, R.P., & DeFries, J.C. (1979). Parent-offspring resemblance for the Identical Blocks test of spatial ability: No evidence for X-linkage. Behavior Genetics, 9, 444-445. (Abstract)

Corley, R.P., Kuse, A.R., & DeFries, J.C. (1980). Familial resemblance for specific cognitive abilities in a sample of Americans of Chinese ancestry. Behavior Genetics, 10, 473-474. (Abstract)
Kuse, A.R., & DeFries, J.C. (1980). Multivariate assortative mating: A cross-correlational analysis. Behavior Genetics, 10, 484-485. (Abstract)

Corley, R., DeFries, J.C., Fulker, D.W., Plomin, R., & Baker, L. (1981). Maximum likelihood estimation of genetic and environmental parameters in the Colorado Adoption Project. Behavior Genetics, 11, 597. (Abstract)

Baker, L.A., DeFries, J.C., Plomin, R., & Fulker, D.W. (1982). Genetic and environmental contributions to longitudinal stability in the Colorado Adoption Project (CAP). Behavior Genetics, 12, 577-578. (Abstract)

Plomin, R., & DeFries, J.C. (1982). Genetic and environmental clusters of Bayley items at one year of age. Infant Behavior and Development, 5, 182. (Abstract)

Vogler, G.P., & DeFries, J.C. (1983). A three-generational bivariate analysis of educational attainment and general intelligence. Behavior Genetics, 13, 556. (Abstract)

LaBuda, M.C., & DeFries, J.C. (1984). Longitudinal stability of reading performance and symbol-processing speed in the Colorado Family Reading Study. Behavior Genetics, 14, 606. (Abstract)

Vogler, G.P., & DeFries, J.C. (1984). Application of multivariate path analysis to data from the Colorado Family Reading Study. Behavior Genetics, 14, 618. (Abstract)

LaBuda, M.C., & DeFries, J.C. (1985). Genetic and environmental contributions to the longitudinal stability of general cognitive ability. Behavior Genetics, 15, 598. (Abstract)

Vogler, G.P., DeFries, J.C., & LaBuda, M.C. (1985). Multivariate path analysis of three measures of reading ability in nuclear families, monozygotic (MZ) twins, and dizygotic (DZ) twins. Behavior Genetics, 15, 612. (Abstract)

LaBuda, M.C., & DeFries, J.C. (1986). Multiple regression analysis of data from reading-disabled and control twins. Behavior Genetics, 16, 624. (Abstract)

Rice, T., DeFries, J.C., & Carey, G. (1986). Multivariate path analysis of specific cognitive abilities in the Colorado Adoption Project: A comparison of alternative models of assortative mating. Behavior Genetics, 16, 634. (Abstract)

Phillips, K., Plomin, R., Fulker, D.W., & DeFries, J.C. (1987). General cognitive ability of 7-year-old children in the Colorado Adoption Project (CAP): Path analysis of genetic and environmental transmission. Behavior Genetics, 17, 635. (Abstract)

Rice, T., & DeFries, J.C. (1987). Multivariate path analysis of parent- offspring resemblance and measures of the home environment in the Colorado Adoption Project. Behavior Genetics, 17, 636. (Abstract)

DeFries, J.C., Wilson, J.R., Erwin, V.G., & Petersen, D.R. (1988). Derivation of the LSXSS recombinant inbred strains of mice. Behavior Genetics, 18, 713. (Abstract)

LaBuda, M.C., & DeFries, J.C. (1988). A twin study of reading disability: Evidence for genetic and environmental etiologies. Behavior Genetics, 18, 722-723. (Abstract)

Gillis, J.J., & DeFries, J.C. (1989). Multiple regression analysis of reading performance data from reading-disabled twins. Behavior Genetics, 19, 758. (Abstract)

Braungart, J.M., Plomin, R., DeFries, J.C., & Fulker, D.W. (1990). Genetics of the environment during infancy: A sibling adoption study of the HOME. Behavior Genetics, 20, 706. (Abstract)

Gillis, J.J., DeFries, J.C., Olson, R.K., & Rack, J.P. (1990). Confirmatory factor analysis of reading performance and process measures in the Colorado Reading Project. Behavior Genetics, 20, 721-722. (Abstract)

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

Gilger, J.W., Pennington, B.F., Pauls, D., & DeFries, J.C. (1991). Evidence for major gene transmission of developmental dyslexia. Behavior Genetics, 21, 572-573. (Abstract)

Gillis, J.J., & DeFries, J.C. (1991). Confirmatory factor analysis of reading and mathematics performance measures in the Colorado Reading Project. Behavior Genetics, 21, 572-573. (Abstract)

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

Braungart, J.M., Plomin, R., Emde, R.N., Campos, J., Corley, R., Fulker, D.W., Kagan, J., Reznick, J.S., Robinson, J., Zahn-Waxler, C., & DeFries, J.C. (1992). Genetic change and continuity from 14 to 20 months: The MacArthur Longitudinal Twin Study. Behavior Genetics, 22, 711. (Abstract)

Cardon, L.R., Fulker, D.W., & DeFries, J.C. (1992). Adiposity rebound in the Colorado Adoption Project: Genetic analysis of an objective measure. Proceedings of the 13th Annual Meeting of the Society of Behavioral Medicine, 65. (Abstract)

DeFries, J.C. (1992). A twin study of dyslexia. Abstracts of the Seventh International Congress on Twin Studies, 88. (Abstract)

Gilger, J.W., Pennington, B.F., Borecki, I., & DeFries, J.C. (1992). Commingling and segregation analysis of complex psychological traits: Are extremes of normal variance etiologically distinct? Behavior Genetics, 22, 722. (Abstract)

Gilger, J., Pennington, B., & DeFries, J. (1992). Is dyslexia a distinct deviation from normal variance in reading skills? Journal of Clinical and Experimental Neuropsychology, 14, 69. (Abstract)

Gillis, J.J., DeFries, J.C., Pennington, B.F., & Gilger, J.W. (1992). Genetic etiology of comorbid reading disabiilty and attention-deficit hyperactivity disorder. Behavior Genetics, 22, 723. (Abstract)

Johnson, T.E., DeFries, J.C., Jensen, A.K., & Markel, P.D. (1992). Mapping quantitative trait loci for behavioral traits in the mouse. Behavior Genetics, 22, 728. (Abstract)

Julian, A.J., Plomin, R., Braungart, J.M., Fulker, D.W., & DeFries, J.C. (1992). Genetic influence on communication development: A sibling adoption study of two- and three-year olds. Behavior Genetics, 22, 728-729. (Abstract)

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. Behavior Genetics, 22, 760. (Abstract)

Wadsworth, J.J., & DeFries, J.C. (1993). Etiology of covariation among measures of IQ and academic achievement. Behavior Genetics, 33, 568. (Abstract)

Alarcón, M., DeFries, J.C., & Fulker, D.W. (1994). Etiology of individual differences in reading performance: Evidence for sex-limitation. Behavior Genetics, 24, 505. (Abstract)

Fulker, D.W., Markel, P.D., DeFries, J.C., Corley, R.P., & Johnson, T.E. (1994). Use of interval mapping to localize quantitative trait loci in recombinant inbred strains. Alcoholism: Clinical and Experimental Research, 18, 452. (Abstract)

Johnson, T.E., Markel, P.D., Fulker, D.W., DeFries, J.C., & Melov, S. (1994). Mapping QTLs for ethanol-induced anesthesia in LSXSS recombinant inbred and F2 mice. Alcoholism: Clinical and Experimental Research, 18, 6A. (Abstract)

Light, J.G., & DeFries, J.C. (1994). Comorbid reading and mathematics deficits: Genetic and environmental etiologies. Behavior Genetics, 24, 520. (Abstract)

Markel, P.D., Beeson, M.A., Gordon, L., DeFries, J.C., Melov, S., & Johnson, T.E. (1994). Mapping QTLs influencing ethanol-induced anesthesia in LS and SS mice. Alcoholism: Clinical and Experimental Research, 18, 452. (Abstract)

Smith, S.D., Pennington, B.F., Fulker, D.W., Cardon, L., Brower, A.M., Kimberling, W.J., & DeFries, J.C. (1994). Evidence for a gene influencing reading disability on chromosome 6p in two populations. American Journal of Human Genetics, 55, A203. (Abstract).

Alarcón, M., & DeFries, J.C. (1995). Quantitative trait locus for reading disability: An alternative test. Behavior Genetics, 25, 253. (Abstract)

Cherny, S.S., Corley, R.P., Fulker, D.W., DeFries, J.C., Goodman, D.W., Markel, P.D., & Johnson, T.E. (1995). Regression approaches to QTL analyses in selected F2 samples. Alcoholism: Clinical and Experimental Research, 19, 48A. (Abstract)

Corley, R.P., Cherny, S.S., Fulker, D.W., DeFries, J.C., Goodman, D.W., Flint, J., & Collins, A.C. (1995). Comparison of regression and maximum-likelihood approaches to quantitative trait locus interval mapping in F2 experiments involving selected samples. Behavior Genetics, 25, 260. (Abstract)

Gayán, J., Olson, R.K., Cardon, L.R., Smith, S.D., Fulker, D.W., Kimberling, W.J., Pennington, B.F., & DeFries, J.C. (1995). Quantitative trait locus for different measures of reading disability. Behavior Genetics, 25, 266. (Abstract)

Filipek, P.A., Pennington, B.F., Holmes, J.L., Lefly, D., Kennedy, D.N., Meyer, J.W., Lang, J.E., Gayán, J., Galaburda, A.M., Simon, J.M., Filley, C.M., Caviness, V.S., & DeFries, J.C. (1995). Developmental dyslexia: Cortical and subcortical anomalies by MRI-based morphometry. Annals of Neurology, 38, 509. (Abstract)

Alarcón, M., & DeFries, J.C. (1996). Etiology of mathematics disability: A twin study. Behavior Genetics, 26, 581. (Abstract)

Cherny, S.S., Corley, R.P., Fulker, D.W., Plomin, R., & DeFries, J.C. (1996). Parent-offspring resemblance for adult general cognitive ability in the Colorado Adoption Project. Behavior Genetics, 26, 583. (Abstract)

Knopik, V.S., DeFries, J.C., & Alarcón, M. (1996). Comorbidity of mathematics and reading deficits in a twin study of mathematics disability. Behavior Genetic, 26, 589. (Abstract)

Alarcón, M., & DeFries, J.C. (1997). A twin study of reading performance and general cognitive ability. Behavior Genetics, 27, 586. (Abstract)

Knopik, V.S., Olson, R.K., Alarcón, M., Cherny, S.S., & DeFries, J.C. (1997). Etiology of covariation between measures of speeded and perceptual processes and reading performance: A twin study. Behavior Genetics, 27, 586. (Abstract)

Gayán, J., Smith, S.D., Cherny, S.S., Cardon, L.R., Fulker, D.W., Kimberling, W.J., Olson, R.K., Pennington, B.F., & DeFries, J.C. (1998). Quantitative trait locus for specific language and reading deficits on chromosome 6p. Behavior Genetics, 28, 469. (Abstract)

Henderson, N.D., Tritto, T., Fulker, D.W., & DeFries, J.C. (1998). Home cage activity in mice selected for high- and low open-field ambulation. Behavior Genetics, 28, 471-472. (Abstract)

Knopik, V.S., & DeFries, J.C. (1998). Common genetic influences on general cognitive ability in males and females: A twin study. Behavior Genetics, 28, 474. (Abstract)

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

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. Behavior Genetics, 29, 353. (Abstract)

Henderson, N.D., Bohl, M., Cykowski, C., & DeFries, J.C. (1999). Albino gene effects on fear-related behaviors of male and female mice. Behavior Genetics, 29, 357. (Abstract)

Knopik, V.S., & DeFries, J.C. (1999). Reading and mathematics performance in twin pairs with and without reading difficulties. Behavior Genetics, 29, 360-361. (Abstract)

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. Behavior Genetics, 29, 373. (Abstract)

Brower, A.M., Deffenbacher, K.E., Olson, R.K., DeFries, J.C., Smith, S.D. (2000). Resolution of marker order and distance to refine linkage in specific reading disability. American Journal of Human Genetics, 67, 322. (Abstract)

Davis, C.J., Knopik, V.S., Wadsworth, S.J., Olson, R.K., & DeFries, J.C. (2000). Differential genetic etiology of reading disability as a function of rapid automatized naming and phonological awareness. Behavior Genetics, 30, 401-402. (Abstract)

Kaplan, D.E., Won, T.W., Ahn, J., Pauls, D., Olson, R., DeFries, J., Wood, F., Page, G., Smith, S.D., Gruen, J.R. (2000). Linkage disequilibrium studies of reading disability on 6p22. American Journal of Human Genetics, 67, 46. (Abstract)

Smith, S.D., Pennington, B.F., Willcutt, E., Deffenbacher, K., Hoover, D., Smolen, A., Moyzis, R., Olson, R.K., DeFries, J.C. (2000). Linkage of an ADHD phenotype to 6p21.3 in a population with reading disability. American Journal of Human Genetics, 67, 350. (Abstract)

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. Behavior Genetics, 30, 421. (Abstract)

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

Davis, C.J., Gayan, J., Knopik, 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. Behavior Genetics, 31, 451. (Abstract)

Deffenbacher, K.E., Hoover, D.M., Kenyon, J.B., Olson, R.K., DeFries, J.C., & Smith, S.D. (2001). Mutation screening of the SynGAP gene in patients with dyslexia. American Journal of Human Genetics, 69, 538. (Abstract)

Wadsworth, S.J., Corley, R., 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. Behavior Genetics, 31, 473. (Abstract)

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. Behavior Genetics, 32, 462. (Abstract)

Davis, C.J., Fisher, S.E., Francks, C., MacPhie, I.L., Gayán, 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. Behavior Genetics, 32, 462. (Abstract)

Fisher, S.E., Francks, C., Marlow, A.J., MacPhie, I.L., Newbury, D.F., Cardon, L.R., Ishikawa-Brush, Y., Richardson, A.J., Talcott, J.B., Gayán, 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 dyslexic sib-pairs from the UK and US. Behavior Genetics, 32, 464. (Abstract)

Gayán, J., 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. Behavior Genetics, 32, 465-466. (Abstract)

Henderson, N.D., Turri, M.G., DeFries, J.C., & Flint, J. (2002). Sex differences in QTLs operating on multiple behavioral assessments of anxiety in laboratory mice. Behavior Genetics, 32, 469. (Abstract)

Turri, M.G., DeFries, J.C., Henderson, N.D., & Flint, J. (2002). Multivariate and epistatic interaction analysis of multiple behavioral dimensions in ethological tests of anxiety in laboratory mice. Behavior Genetics, 32, 486. (Abstract)

Deffenbacher, K.E., Kenyon, J.B., Hoover, D.M., Olson, R.K., Pennington, B.F., DeFries, J.C., Smith, S.D. (2003). Influencing dyslexia through linkage and association analysis. The American Journal of Human Genetics, 73, 497. (Abstract)

DeFries, J.C., & Wadsworth, S.J. (2004). Twin study of reading disabilities. Behavior Genetics, 34, 635-636. (Abstract)

Fagerheim, T., McAuley, E., Tonnessen, F.-E., Smith, S.D., Olson, R.K., Pennington, B.F., DeFries, J.C., Monaco, A.P. (2004).Association and linkage analysis of the dyslexia susceptibility locus (DYX3) on chr 2p15-p16. The American Society of Human Genetics, 54th Annual Meeting (pp. 370). Bethesda MD: The American Society of Human Genetics. (Abstract)

Francks, C., Paracchini, S., Smith, S.D., Richarson, A.J., Scerri, T.S., Cardon, L.R., Marlow, A.J., MacPhie, L., Walter, J., Pennington., B.F., Fisher, S.E., Olson, R.K., DeFries, J.C., Stein, J.F., & Monaco, A.P. (2004). Association mapping of the 6p23-21.3 QTL for reading disability. Behavior Genetics, 34, 639. (Abstract)

Gayán, J., Willlcutt, E.G., Fisher, S.E., Francks, C., Cardon, L.R., Olson, R.K., Pennington, B.F., Smith S.D., Monaco, A.P., & DeFries, J.C. (2004). Bivariate linkage scan for reading disability and attention-deficit/hyperactivity disorder. Behavior Genetics, 34, 640. (Abstract)

Meng, H., Smith, S.D., Kenyon, J., Hager, K., Held, M., DeFries, J.C., Olson, R.K., Pennington, B.F., Gelernter, G.P., Page, & Gruen, J.R. (2004). Expression profiles for 6p reading disability locus (DYX2) gene-candidates. The American Society of Human Genetics, 54th Annual Meeting (pp. 387). Bethesda MD: The American Society of Human Genetics. (Abstract)

Paracchini, S., Francks, C., Smith S.D., Richardson, A.J., Scerri, T.S., Cardon, L.R., Marlow, A.J., MacPhie, I.L., Walter, J., Pennington, B.F., Fisher, S.E., Olson, R.K., DeFries, J.C., Stein, J.F., Monaco, A.P. (2004). A QTL on 6p22 is showing significant association to dyslexia in two independent samples. The American Society of Human Genetics, 54th Annual Meeting (pp. 371). Bethesda MD: The American Society of Human Genetics. (Abstract)

Rhee, S.H., Willcutt, E.G., Hartman, C.A., Pennington, B.F., & DeFries, J.C. (2004). Test of alternative hypotheses explaining the comorbidity between attention-deficit/hyperactivity disorder and conduct disorder. Behavior Genetics, 34, 658. (Abstract)

Smith, S.D., Deffenbacher, K.E., Boada, R., Raitano, N., Tunick, R., Shirberg, L.D., Olson, R.K., Pennington, B.F., & DeFries, J.C. (2004). Linkage association and candidate-gene analyses for reading disability and speech sound disorder. Behavior Genetics, 34, 660. (Abstract)

Smith, S.D., Meng, H., Kenyon, J., Held, M., Hager, K., DeFries, J.C., Pennington, B.F., Olson, R.K., Page, G.P., & Gruen, J.R. (2004). Lack of linkage, association, or mutation with EKN1 and dyslexia in a Colorado twin cohort. The American Society of Human Genetics, 54th Annual Meeting (pp. 389). Bethesda MD: The American Society of Human Genetics. (Abstract)

Wadsworth, S.J., & DeFries, J.C., (2004). Genetic etiology of reading difficulties as a function of gender. Behavior Genetics, 34, 664. (Abstract)

Willcutt, E.G., Pennington, B.F., Olson, R.K., & DeFries, J.C. (2004). Understanding comorbidity: A twin study of reading disability and attention-deficit/hyperactivity disorder. Behavior Genetics, 34, 665. (Abstract)

Gaffney-Brown, R., Wilcutt, E.G., Pennington, B.B, & DeFries, J.C. (2005). Sex differences in bivariate heritability for relational aggression and delinquency in twin pairs. Behavior Genetics, 35, 800-801. (Abstract)

Godinez, D.A., Rhee, S.H., Friedman, N., Young, S.E, Corley, R., & DeFries, J.C. (2005). Genetic and environmental architecture and structure of the Wisconsin Card Sorting Task (WCST). Behavior Genetics, 35, 801-802. (Abstract)

Hawke, J.L., Wadsworth, S.J., Olson, R.K., & DeFries, J.C., (2005). Genetic etiology of reading difficulties as a function of gender and severity. Behavior Genetics, 35, 804-805. (Abstract)

Gaffney-Brown, R., Willcutt, E.G., Pennington, B.B, & DeFries, J.C. (2005). Sex differences in bivariate heritability for relational aggression and delinquency in twin pairs. Behavior Genetics, 35, 800-801. (Abstract)

Godinez, D.A., Rhee, S.H., Friedman, N., Young, S.E., Corley, R., DeFries, J.C., Miyake, A., & Hewitt, J.K. (2005). Genetic and environmental architecture and structure of the Wisconsin Card Sorting Task (WCST). Behavior Genetics, 35, 802-803. (Abstract)

Hawke, J.L., Wadsworth, S.J., Olson, R.K., & DeFries, J.C. (2005). Genetic etiology of reading difficulties as a function of gender and severity. Behavior Genetics, 35, 804-805. (Abstract)

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

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. Behavior Genetics, 36, 956. (Abstract)

Bricker, J.B., Stallings, M.C., Corley, R.P., Haberstick, B.C., Smolen, A., Stetler, G., Young, S.E., Hewitt, J.K., DeFries, J.C. (2006). Association between age of sexual initiation and dopamine-encoding genes in combined twin and adoption samples. Behavior Genetics, 36, 957. (Abstract)

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

Hawke, J.L., Stallings, M.C., Wadsworth, S.J., DeFries, J.C. (2006). Combined analysis of reading performance data from reading-disabled and control twin pairs using the Pearson-Aitken selection formula. Behavior Genetics, 36, 969-970. (Abstract)

Bricker, J.B., Stallings, M.C., Corley, R.P., Gelhorn, H., & DeFries, J.C. (2007). Association between age of sexual initiation and deviant behavior in combined twin and adoption samples. Behavior Genetics, 37, 741-742. (Abstract)

Friend, A., DeFries, J.C., & Olson, R.K. (2007). Parental education mediates heritability of word recognition deficits in twins selected for reading disability. Behavior Genetics, 37, 753-754. (Abstract)

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. Behavior Genetics, 37, 796. (Abstract)

Astrom, R., Wadsworth, S. J., & DeFries, J.C. (2008).   Etiology of the stability of reading deficits: An update.  Behavior Genetics, 38, 614.  (Abstract)

Coventry, W.L., Byrne, B., Olson, R.K., Samuelsson, S., Corley, R., Wadsworth S., & DeFries, J.C. (2008).  Do the genetic effects for literacy in early childhood differ across sex or across the disabled and normal range?  Behavior Genetics, 38, 619.  (Abstract)

Hawke, J., DeFries, J.C., Pennington, B.F., Wadsworth, S.J., & Willcutt, E.G.  (2008).  Genetic etiologies of parent- and teacher-rated ADHD symptom dimensions.  Behavior Genetics, 38, 630.  (Abstract)

Astrom, R.L., DeFries, J.C., Pennington, B.F., Wadsworth, S.J., & Willcutt, E.G. (2009).  Etiology of covariation between a parent-report screening measure and reading performance.  Behavior Genetics, 39, 634.  (Abstract)

Brant, A.M., Haberstick, B.C., Corley, R.P., Wadsworth, S.J., DeFries, J.C., & Hewitt, J.K. (2009).  The developmental etiology of high IQ.  Behavior Genetics, 39, 638.  (Abstract)

Friedman, N.P., Miyake, A., Young, S.E., Corley, R.P., Haberstick, B.C., Willcutt, E.G., DeFries, J.C., & Hewitt, J.K. (2009).  Unity and diversity of executive functions in the Longitudinal Twin Study. Behavior Genetics, 39, 652.  (Abstract)

Hewitt, J., Brant, A., Corley, R., Wadsworth, S., DeFries, J. (2010).  A closer look at the developmental etiology of high IQ.  Twin Research and Human Genetics, 13, 263.  (Abstract)

Brant, A.M., Boomsmsa, D.I., Corley, R.P., DeFries, J.C., Haworth, C.M.A., Hewitt, J.K., Martin, N.G., McGue, M., Petrill, S.A., Plomin, R., Wadsworth, S.J., Wright, M.J. (2010). Ability and heritability: investigating the continuous effect of IQ score on IQ etiology in multiple samples. Behavior Genetics, 40, 788. (Abstract)

Reynolds, C., Wadsworth, S.A., Corley, R.P., Stallings, M.C., and DeFries, J.C. (2012). Etiology of change in cognitive abilities from adolescence to early adulthood in the Colorado Adoption Project. Behavior Genetics, 42, 963. (Abstract)

Arnett AB, Pennington BF, Peterson RL, Willcutt EG, DeFries JC, Olson RK. Explaining the sex difference in dyslexia. J Child Psychol Psychiatry. 2017 Jun;58(6):719-727. doi: 10.1111/jcpp.12691. Epub 2017 Feb 8.