Text Box: University of Colorado at Boulder
Department of Psychology
Text Box: Clinical Psychology
Text Box: Behavioral Genetics
Text Box: Neuroscience

The Developmental Psychopathology Laboratory

Arnett, A. B.*, Pennington, B. F., Friend, A., Willcutt, E. G., Byrne, B., Samuelsson, S., & Olson, R. K. (In press). The SWAN captures variance at both the negative and positive ends of the ADHD symptom spectrum. Journal of Attention Disorders.

Christopher, M. E.*, Miyake, A., Keenan, J. M., Pennington, B. F., DeFries, J. C., Wadsworth, S. J., Willcutt, E. G., & Olson, R. K. (In press). Predicting word reading and comprehension with executive function and speed measures: A latent variable analysis.

Willcutt, E. G. (in press). Using behavior genetic methods to understand the etiology of comorbidity.  In S. Rhee & A. Ronald (Eds.), Behavior genetics of psychopathology. Springer, New York.

Willcutt, E. G. (in press). Genetics of ADHD. In D. Barch (ed.), Cognitive and Affective Neuroscience of Psychopathology. Oxford University Press.

Astrom, R. L.*, Wadsworth, S. J., Olson, R. K., Willcutt, E. G., & DeFries, J. C. (2011). DeFries-Fulker analysis of longitudinal reading performance data from twin pairs ascertained for reading difficulties and from their nontwin siblings. Behavior Genetics, 41, 660-667.

Bidwell, L. C.*, Willcutt, E. G., McQueen, M. B., DeFries, J. C., Olson, R. K., Smith, S. D., & Pennington, B. F. (2011). A Family Based Association Study of DRD4, DAT1, and 5HTT and Continuous Traits of Attention-Deficit Hyperactivity Disorder. Behavior Genetics, 41, 165-174.

McGrath, L. M.*, Shanahan, M. A., Santerre-Lemmon, L. E.*, Barnard, H. D.*, Willcutt, E. G., Olson, R. K., DeFries, J. C., & Pennington, B. F. (2011). A multiple deficit model of Reading Disability and Attention-Deficit/Hyperactivity Disorder: searching for a shared cognitive deficits. Journal of Child Psychology and Psychiatry. 52, 547-557.

Olson, R. K., Hulslander, J., Christopher, M.*, Keenan, J. M., Wadsworth, S. J., Willcutt, E. G., Pennington, B. F., & DeFries, J. C. (2011). Genetic and environmental influences on writing and their relations to language and reading. Annals of Dyslexia, 61, 1-19.

Olson, R., Keenan, J., Byrne, B., Samuelsson, S., Coventry, W., Corley, R., Wadsworth, S., Willcutt, E., DeFries, J., Pennington, B. F., & Hulslander, J. (2011). Genetic and environmental influences on vocabulary and reading development from pre-kindergarten through grade 4. Scientific Studies of Reading, 15, 26-46.

Pennington, B. F., Santerre-Lemmon, L., Rosenberg, J., MacDonald, B., Boada, R., Friend, A., Willcutt, E. G., Olson, R. K. (2011). Individual prediction of dyslexia by single versus multiple deficit models. Journal of Abnormal Psychology. Online first.

Rosenberg, J., Pennington, B. F., Willcutt, E. G., Olson, R. K. (2011). Opposite gene by environment interactions in reading disability (RD) and attention deficit/hyperactivity disorder (ADHD). Journal of Child Psychology and Psychiatry. Online first.

Sergeant, J., Willcutt, E. G., & Nigg, J. T. (2011). How clinically functional are executive function measures of ADHD? In D. Shaffer, E. Leibenluft, L.A. Rohde, P. Sirovatka & D.A. Regier (Eds.), Externalizing disorders of childhood: Refining the research agenda for DSM-V. Arlington, VA: American Psychiatric Association.

Willcutt, E. G., & Bidwell, L. C. (2011). Etiology of ADHD: Implications for assessment and treatment. In B. Hoza and S. W. Evans (eds.), Treating Attention Deficit Hyperactivity Disorder. Civic Research Institute, Kingston, NJ.

Willcutt, E. G., Boada, R., Riddle, M. W., Chhabildas, N. A., & Pennington, B. F. (2011). A parent-report screening questionnaire for learning difficulties in children. Psychological Assessment, 778 - 791.

Willcutt, E. G., & McQueen, M. (2011). Genetic and environmental risk factors for bipolar spectrum disorders. In The Developmental Psychopathology of Bipolar Disorder, D. Miklowitz and D. Cicchetti, eds., pp. 225 - 258.

Willcutt, E. G., Nigg, J. T., Pennington, B. F., Carlson, C. L., McBurnett, K., Rohde, L. A., Solanto, M. V., Tannock, R., & Lahey, B. B. (2011). Validity of DSM-IV attention-deficit/hyperactivity disorder symptom dimensions and subtypes. Journal of Abnormal Psychology.

Betjemann, R. S., Johnson, E. P., Barnard, H.*, Boada, R., Filley, C. M., Filipek, P. A., Willcutt, E. G., DeFries, J. C. & Pennington, B. F. (2010). Genetic covariation between between brain volumes and IQ, reading performance, and processing speed. Behavior Genetics, 40, 135 - 145.

Burgess, G. C., Depue, B. E., Ruzic, L., Willcutt, E. G., Du, Y. P. P., & Banich, M. T. (2010). Attentional Control Activation Relates to Working Memory in Attention-Deficit/Hyperactivity Disorder. Biological Psychiatry, 67, 632-640.

Byrne, B., Coventry, W. L., Olson, R. K., Wadsworth, S. J., Samuelsson, S., Petrill, S. A. et al. (2010). "Teacher Effects" in Early Literacy Development: Evidence From a Study of Twins. Journal of Educational Psychology, 102, 32-42.

Depue, B. E., Burgess, G. C., Bidwell, L. C., Willcutt, E. G., & Banich, M. T. (2010). Behavioral performance predicts grey matter reductions in the right inferior frontal gyrus in young adults with combined type ADHD. Psychiatry Research-Neuroimaging, 182, 231 - 237.

Depue, B. E., Burgess, G. C., Willcutt, E. G., Ruzic, L., & Banich, M. T. (2010). Inhibitory control of memory retrieval and motor processing associated with the right lateral prefrontal cortex: evidence from deficits in individuals with ADHD. Neuropsychologia, 48, 3909 - 3917.

Depue, B. E., Burgess, G. C., Willcutt, E. G., Bidwell, L. C., Ruzic, L., & Banich, M. T. (2010). Symptom-correlated brain regions in young adults with combined-type ADHD: Their organization, variability, and relation to behavioral performance. Psychiatry Research: Neuroimaging, 182, 96 - 102.

Ebejer, J. L., Coventry, W. L., Byrne, B., Willcutt, E. G., Olson, R. K., Corley, R., & Samuelsson, S. (2010). Genetic and environmental influences on inattention, hyperactivity-impulsivity, and reading: Kindergarten to grade 2. Scientific Studies of Reading, 14, 293 - 316.

Hart, S. A., Petrill, S. A., Willcutt, E. G., Thompson, L. A., Schatschneider, C., Deater-Deckard, K., & Cutting, L. E. (2010). Exploring how ADHD symptoms are related to reading and mathematics performance: General genes, general environments. Psychological Science, 21, 1708 - 1715.

Hulslander, J., Olson, R. K., Wadsworth, S. J., & Willcutt, E. G. (2010). Longitudinal stability of reading-related skills and their prediction of reading growth across the later grades. Scientific Studies of Reading, 14, 111 - 136.

Lahey, B. B., & Willcutt, E. G. (2010). Predictive Validity of an Alternative to Nominal Subtypes of Attention-Deficit Hyperactivity Disorder for DSM-V. Journal of Child and Adolescent Clinical Psychology, 39, 761-775.

Smith, S. D., Grigorenko, E., Willcutt, E. G., Pennington, B. F., Olson, R. K. (2010). Etiologies and molecular mechanisms of communication disorders. Journal of Developmental and Behavioral Pediatrics, 31, 555 - 563.

Willcutt, E.G., Betjemann, R., McGrath, L., Chhabildas, N. A., Olson, R. K., DeFries, J. C., & Pennington, B. F. (2010). Etiology and neuropsychology of comorbidity between RD and ADHD: The case for multiple-deficit models. Cortex, 46, 1345 - 1361.

Willcutt, E. G., Pennington, B. F., Duncan, L., Smith, S. D., Keenan, J. M., Wadsworth, S. J., DeFries, J. C., & Olson, R. K. (2010). Understanding the complex etiologies of developmental disorders: behavioral and molecular genetic approaches. Journal of Developmental and Behavioral Pediatrics, 31, 533 - 544.

Banich, M. T., Burgess, G. C.*, Depue, B. E.*, Ruzic, L.*, Bidwell, L. C.*, *Hitt-Laustsen, S.*, & Willcutt, E. G. (2009). The neural basis of sustained and transient attentional control in young adults with ADHD. Neuropsychologia, 47, 3095 - 3104.

Byrne, B., Coventry, W. L., Olson, R. K., Samuellson, S., Wadsworth, S., Corley, R., Willcutt, E. G., Wadsworth, S. J., & DeFries, J. C. (2009). Genetic and Environmental Influences on Aspects of Literacy and Language in Early Childhood:  Continuity and Change from Preschool to Grade 2. Journal of Neurolinguistics, 22, 219 - 236.

Coventry, W. L., Byrne, B., Coleman, M., Olson, R. K., Corley, R., Willcutt, E., & Samuelsson, S. (2009). Does classroom separation affect twins' reading ability in the early years of school? Twin Research and Human Genetics, 12, 455-461.

Doyle, A. E., Ferreira, M. A., Sklar, P. B., Lasky-Su, J., Petty, C., Fusillo, S. J., Seidman, L. J., Willcutt, E. G., Smoller, J. W., Purcell, S., Biederman, J., & Faraone, S. V. (2009). Multivariate genomewide linkage scan of neurocognitive traits and ADHD symptoms: suggestive linkage to 3q13. American Journal of Medical Genetics (Neuropsychiatric Genetics), 147B, 1399-1411.

Friend, A., DeFries, J.C., Olson, R.K., Pennington, B., Harlaar, N., Byrne, B., Samuelsson, S., Willcutt, E.G., Wadsworth, S.J., Corley, R., & Keenan, J. M. (2009). Heritability of high reading ability and its interaction with parental education. Behavior Genetics, 39, 427 - 436.

Hawke, J. L.*, Olson, R. K., Willcutt, E. G., Wadsworth, S. W., & DeFries, J. C. (2009). Gender ratios for reading difficulties. Dyslexia, 15, 239 - 242.

Pennington, B. F., McGrath, L.*, Barnard, H.*, Rosenberg, J.*, Smith, S. D., Willcutt, E. G., Friend, A.*, DeFries, J. C., & Olson, R. K. (2009). Gene X Environment interactions across the phenotypic distribution: Evidence from reading disability and attention-deficit/hyperactivity disorder. Development and Psychopathology, 45, 77 - 89.

Willcutt, E. G. (2009). ADHD. In K. O. Yeats, D. Ris, G. Taylor, & B. F. Pennington (Eds.), Pediatric Neuropsychology: Research, Theory, and Practice. (pp. 393 - 417). Guilford Press: New York.

Young, S. E., Friedman, N. P., Miyake, A., Willcutt, E. G., Corley, R. P., Haberstick, B., DeFries, J. C., & Hewitt, J. K. (2009). Behavioral disinhibition: liability for externalizing spectrum disorders and its genetic and environmental relation to response inhibition across adolescence. Journal of Abnormal Psychology, 118, 117 - 130.

Betjemann, R. S.*, Willcutt, E. G., Olson, R. K., Keenan, J. M., DeFries, J. C., & Wadsworth, S. J. (2008). Word reading and reading comprehension: Stability, overlap, and independence. Reading and Writing, 21, 539 - 558.

Byrne, B., Olson, R. K., Hulslander, J., Samuelsson, S., Wadsworth, S., DeFries, J.C., Corley, R., Coventry, W. L., & Willcutt, E. G. (2008). A behavior-genetic analysis of orthographic learning, spelling, and decoding. Journal of Research in Reading, 31, 8 - 21.

Rhee, S. H., Willcutt, E. G., Hartman, C. A., Pennington, B. F., & DeFries, J. C. (2008). Test of alternative hypotheses explaining the comorbidity between attention-deficit/hyperactivity disorder and conduct disorder. Journal of Abnormal Child Psychology, 36, 29 - 40.

Shanahan, M.*, Willcutt, E. G., & Pennington, B. F. (2008). Do motivational incentives reduce the inhibition deficit in ADHD? Developmental Neuropsychology, 33, 137-159.

Sonuga-Barke, E. J. S., Sergeant, J., Nigg, J., & Willcutt, E. (2008). Executive dysfunction and delay aversion in ADHD: Nosological and diagnostic implications. Child and Adolescent Psychiatric Clinics of North America, 17, 367 - 384.

Samuellson, S., Byrne, B., Wadsworth, S., Corley, R., DeFries, J. C., Willcutt, E. G., Hulslander, J., & Olson, R. K. (2008). Response to early literacy instruction in the United States, Australia, and Scandinavia: A behavioral-genetic analysis. Learning and Individual Differences, 18, 289 - 295.

Willcutt, E. G., Sonuga-Barke, E. J. S., Nigg, J. T., & Sergeant, J. A. (2008). Recent developments in neuropsychological models of childhood psychiatric disorders. Advances in Biological Psychiatry, 24, 195-226.

Bidwell, L. C.*, Willcutt E. G., Pennington B. F. (2007). Testing for neuropsychological endophenotypes in siblings discordant for ADHD. Biological Psychiatry, 62, 991-998.

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

Frank, M., Santamaria, A.*, O’Reilly, R. & Willcutt, E. G.  (2007). Testing Computational Models of Dopamine and Noradrenaline Dysfunction in Attention Deficit/Hyperactivity Disorder. Neuropsychopharmacology, 32, 1583 - 1599.

Friedman, N., P., Haberstick, B. C., Willcutt, E. G., Miyake, A., Young, S. E., Corley, R. P., & Hewitt, J. K. (2007). Greater attention problems during childhood predict poorer executive functioning in late adolescence. Psychological Science, 18, 893 - 900.

Hartman, C.*, Rhee, S. H., Willcutt, E. G., & Pennington, B. F. Modeling rater disagreement for ADHD: Are parents or teachers biased? (2007). Journal of Abnormal Child Psychology, 35, 536 - 542.

McGrath, L. M.*, Pennington, B. F., Willcutt, E. G., Boada, R., Shriberg, L. D., & Smith, S. D. (2007). Gene x Environment interactions in speech sound disorder predict language and preliteracy outcomes. Development and Psychopathology, 19, 1047-1072.

Samuelsson, S., Byrne, B., Wadsworth, S., Corley, R., DeFries, J. C., Willcutt, E., Hulslander, J., & Olson, R. K. (2007). Genetic and environmental influences on prereading skills and early reading and spelling development: A comparison among the United States, Australia, and Scandinavia. Reading and Writing, 20, 51 - 75.

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

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, 4, 181-192.

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, 20, 103 - 125.

Willcutt, E. G., Pennington, B. F., Olson, R. K., & DeFries, J. C. (2007). Understanding comorbidity: A twin study of reading disability and attention-deficit/hyperactivity disorder. American Journal of Medical Genetics (Neuropsychiatric Genetics), 8, 709 - 714.

Shanahan, M.*, Yerys, B.*, Scott, A.*, Willcutt, E. G., & Pennington, B. F. (2006). Processing speed deficits in attention-deficit/hyperactivity disorder and reading disability. Journal of Abnormal Child Psychology, 34, 585 - 602.

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.

Banaschewski, T., Hollis, C., Oosterlaan, J., Roeyers, H., Rubia, K., Willcutt, E., & Taylor, E. (2005). Towards an understanding of unique and shared pathways in the psychopathology of ADHD. Developmental Science, 8, 132-140.

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.

Doyle, A. E., Faraone, S. V., Seidman, L. J., Willcutt, E. G., Nigg, J. T., Waldman, I., Pennington, B. F., Peart, J., & Biederman, J. (2005). Are endophenotypes based on measures of executive functions useful for molecular genetic studies of ADHD? Journal of Child Psychology and Psychiatry, 46, 774-803.

Doyle, A. E., Willcutt, E. G., Seidman, L. J., Chouinard, V., Silva, J., & Faraone, S. V. (2005). ADHD endophenotypes. Biological Psychiatry, 57, 1324-1335.

Gayán, J., Willcutt, E. G., Olson, R. K., Fisher, S., Francks, C., Smith, S. D., Pennington, B. F., Olson, R. K., Monaco, A. P., & DeFries, J. C. (2005). Bivariate linkage genome scan for reading disability and attention-deficit hyperactivity disorder: pleiotropic loci at 13q32 and 14q32. Journal of Child Psychology and Psychiatry, 46, 1045-1056.

Lahey, B. B., Pelham, W. E., Loney, J., Lee, S. S., & Willcutt, E. G. (2005). Instability of the DSM-IV subtypes of ADHD from preschool through elementary school. Archives of General Psychiatry, 62, 896-902.

Nigg, J. T., Willcutt, E. G., Doyle, A. E., & Sonuga-Barke, E. J. S. (2005). Heterogenous Causality in ADHD: The Need for a Neuropsychologically Impaired Subtype. Biological Psychiatry, 57, 1231 - 1238.

Pennington, B. F., Willcutt, E. G., & Rhee, S. H. (2005). Analyzing Comorbidity. In Robert V. Kail (Ed.), Advances in Child Development and Behavior, vol. 33. Oxford: Elsevier Ltd.

Rhee, S. H., Corley, R., Stallings, M. C., Willcutt, E. G., & Hewitt, J. K. (2005). Testing hypotheses regarding causes of comorbidity:  Examining the underlying deficits of comorbidity disorders. Journal of Abnormal Psychology, 114, 346-362.

Samuelsson, S., Byrne, B., Quain, P., Wadsworth, S., Corley, R., DeFries, J. C., Willcutt, E., & Olson, R. K. (2005). Environmental and genetic influences on pre-reading skills in Australia, Scandinavia, and the United States. Journal of Educational Psychology, 97, 705-722.

Stevenson, J., Asherson, P., Hay, D., Levy, F., Swanson, J., Thapar, A., & Willcutt, E. (2005). Characterising the ADHD phenotype for genetic studies. Developmental Science, 8, 115-121.

Todd, R. D., Huang, H., Smalley, S. L., Nelson, S. F., Willcutt, E. G., Pennington, B. F., Smith, S. D., Faraone, S. V., & Neuman, R. J. (2005). Collaborative analysis of DRD4 and DAT genotypes in population-defined ADHD subtypes. Journal of Child Psychology and Psychiatry, 46, 1067-1073.

Willcutt, E. G., & Carlson, C. L. (2005). Diagnostic validity of attention-deficit/hyperactivity disorder. Clinical Neuroscience Review, 5, 219-232.

Willcutt, E. G., Pennington, B. F., *Chhabildas, N. A., Olson, R. K., & Hulslander, J. L. (2005). Neuropsychological analyses of comorbidity between RD and ADHD: in search of the common deficit. Developmental Neuropsychology, 27, 35-78.

Willcutt, E. G., *Brodsky, K., *Chhabildas, N., *Shanahan, M., *Yerys, B., *Scott, A., & Pennington, B. F. (2005). The neuropsychology of ADHD: validity of the executive function hypothesis. In D. Gozal and D. L. Molfese (eds.), Attention deficit hyperactivity disorder: from genes to patients, pp. 185-213. Humana Press: Totowa, NJ.

Willcutt, E. G., Doyle, A. E., Nigg, J. T., Faraone, S. V., & Pennington, B. F. (2005). A meta-analytic review of the executive function theory of ADHD. Biological Psychiatry, 57, 1336-1346.

*Hartman, C. A., Willcutt, E. G., Rhee, S. H., & Pennington, B. F. (2004). The relation between sluggish cognitive tempo and DSM-IV ADHD. Journal of Abnormal Child Psychology, 32, 491-503.

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.

Lahey, B. B., Pelham, W. E., Loney, J., Kipp, H., Ehrhardt, A., Lee, S., Willcutt, E., Hartung, C., Chronis, A., & Massetti, G. (2004). Three-year predictive validity of DSM-IV Attention-deficit/Hyperactivity Disorder in children diagnosed at 4-6 Years of Age. American Journal of Psychiatry, 161, 2014-2020.

Willcutt, E. G. (2004). Behavior Genetics. In W. E. Craighead & C. Nemeroff (eds.), Corsini Concise Encyclopedia of Psychology and Behavioral Sciences. Wiley & Sons: New York, pp. 105-107.

Willcutt, E. G., & *Gaffney-Brown, R. (2004). Etiology of dyslexia, ADHD, and related difficulties: Using genetic methods to understand comorbidity. Perspectives of the International Dyslexia Association, 30, 12-15.

*Friedman, M., *Chhabildas, N., Budhiraja, N., Willcutt, E. G., & Pennington, B. F. (2003). Etiology of comorbidity between ADHD and reading disability: Exploration of the assortative mating hypothesis. American Journal of Medical Genetics (Neuropsychiatric Genetics), 120B, 109-115.

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

Barkley, R. A., Cook, E. H., Diamond, A., Zametkin, A., Thapar, A., Teeter, A., Anastopoulos, A. D., Sadeh, A., Leventhal, B. L., Hoza, B., Corbett, B., Molina, B., Pennington, B., Paternite, C. E., Whalen, C., Carlson, C., Johnston, C., Gillberg, C., Hartung, C., Waschbusch, D. A., Connor, D. F., Anderson, D. L., Lynam, D. R., Mash, E. J., Taylor, E., Willcutt, E., Levy, F., Carlson, G., DuPaul, G. J., Koplewicz, H. S., Bird, H. R., Quay, H., Abikoff, H., Hodgens, J. B., McGough, J. J., Loney, J., Halperin, J., Piacentini, J., Werry, J. S., Bauermeister, J. J., Biederman, J., Sergeant, J., McBurnett, K., Winters, K. C., Murphy, K. R., Greenhill, L., Lewandowski, L., Hechtman, L., Pfiffner, L., Weyandt, L. L., Atkins, M., Prior, M., Stein, M. A., Rapport, M. D., Fischer, M., Fristad, M. A., Solanto-Gardner, M., Aman, M., Gordon, M., DeKlyen, M., Dulcan, M., Bukstein, O., Tolan, P. H., Firestone, P., Milich, R., McGee, R., Brown, R.T., Tannock, R., Schachar, R., Mannuzza, S., Loo, S.K., Eyberg, S., Houghton, S., Hinshaw, S. P., Shapiro, S., Faraone, S. V., Pliszka, S. R., Evans, S. W., Campbell, S., Sagvolden, T., Shelton, T. L., Brown, T. E., Joiner, T., Lock, T. M., Spencer, T., Pelham, W. E. (2002). International consensus statement on ADHD. Clinical Child and Family Psychology Review, 5, 89-111. 

*Boada, R., Willcutt, E. G., *Tunick, R. A., *Chhabildas, N. A., *Ogline, J., Olson, R. K., DeFries, J. C., & Pennington, B. F. (2002). A twin study of the etiology of high reading ability. Reading and Writing, 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 - 73.

Hartung, C.M., Willcutt, E. G., Lahey, B. B., Pelham, W. E., Keenan, K., Loney, J., & Steiner, R. (2002). Sex differences in young children who meet criteria for attention-deficit / hyperactivity disorder. Journal of Clinical Child and Adolescent Psychology, 31, 453-464.

Lahey, B. B., & Willcutt, E. (2002). Validity of the diagnosis and dimensions of attention deficit hyperactivity disorder. In P. S. Jensen & J. R. Cooper (Eds.), Attention Deficit Hyperactivity Disorder: State of the Science (pp. 1-1 – 1-23). New York: Civic Research Institute.

Nigg, J. T., John, O. P., Blaskey, L., Huang-Pollock, C., Willcutt, E. G., Hinshaw, S. P., & Pennington, B. F. (2002). Big Five dimensions and ADHD symptoms:  Links between personality traits and clinical symptoms. Journal of Personality and Social Psychology, 83, 451-469.

Wadsworth, S. J., *Davis, C. J., *Knopik, V. S., Willcutt, E. G., & DeFries, J. C. (2002). Genetics of reading disabilities.  In Proceedings of the 12th Postgraduate Course in Pediatric Neurology:  Learning Disabilities in Reading and Writing (pp. 23-36), FrancoAngeli: Milan.

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

Chhabildas, N. A., Pennington, B. F., & Willcutt, E. G. (2001).  A comparison of the cognitive deficits in the DSM-IV subtypes of ADHD.  Journal of Abnormal Child Psychology, 29, 529-540.

Willcutt, E. G., Chhabildas, N., & Pennington, B. F. (2001).  Validity of the DSM-IV subtypes of ADHD.  The ADHD Report, 9, 2-5.

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

Willcutt, E. G., & Pennington, B. F. (2000). Comorbidity of reading disability and attention-deficit/ hyperactivity disorder: Differences by gender and subtype. Journal of Learning Disabilities, 33, 179-191.

Willcutt, E. G., & Pennington, B. F. (2000).  Psychiatric comorbidity in children and adolescents with reading disability.  Journal of Child Psychology and Psychiatry, 41, 1039-1048.

Willcutt, E. G., Pennington, B. F., & DeFries, J. C. (2000).  Etiology of inattention and hyperactivity/impulsivity in a community sample of twins with learning difficulties.  Journal of Abnormal Child Psychology, 28, 149-159.

Willcutt, E. G., Pennington, B. F., & DeFries, J. C. (2000).  A twin study of the etiology of comorbidity between reading disability and attention-deficit/hyperactivity disorder.  American Journal of Medical Genetics (Neuropsychiatric Genetics), 96, 293-301.

McBurnett, K., Pfiffner, L. J., Willcutt, E., Tamm, L., Lerner, M., Ottolini, Y. L., & Furman, M. B. (1999).  Experimental cross-validation of DSM-IV types of Attention-Deficit Hyperactivity Disorder.   Journal of the American Academy of Child and Adolescent Psychiatry, 38, 17-24.

Willcutt, E. G., Hartung, C. M., Lahey, B. B., Pelham, W. E., & Loney, J. (1999). Utility of behavior ratings made by examiners during assessments of children with attention-deficit/hyperactivity disorder.  Journal of Abnormal Child Psychology, 27, 463-472. 

Willcutt, E. G., Pennington, B. F., Chhabildas, N. A., Friedman, M. C., & Alexander, J. (1999). Psychiatric comorbidity associated with DSM-IV ADHD in a nonreferred sample of twins.  Journal of the American Academy of Child and Adolescent Psychiatry, 38, 1355-1362.

Lahey, B. B., Pelham, W. E., Stein, M., Loney, J., Trapani, C., Nugent, K., Kipp, H., Schmidt, E. G., Lee, S., Cale, M., Gold, E. G., Hartung, C., Willcutt, E. G., & Baumann, B. (1998).  Validity of DSM-IV Attention-deficit/Hyperactivity Disorder for young children. Journal of the American Academy of Child and Adolescent Psychiatry, 37, 695-702.

Willcutt, E. G., & Pennington, B. F. (1998).  Assessment of DSM-IV reading disorder.  Clinical Child Psychology Newsletter, 13, 6-11.

Swanson, J. M., McBurnett, K., Wigal, T., Pfiffner, L., Lerner, M., Williams, L., Willcutt, E., Christian, D., Tamm, L., Crowley, K., Clevenger, W., Khouzam, N., Woo, C., & Crinella, F. (1993).  Effect of stimulant medication on children with Attention Deficit Disorder:  A "review of reviews".  Exceptional Children, 60, 154-162.

Swanson, J. M., Willcutt, E., McBurnett, R. K., Cantwell, D., Lerner, M., Pfiffner, L. J., Wigal, T., Kotkin, R., & Tamm, L. (1992). Treatment of ADHD: Beyond medication. Beyond Behavior, 4, 12-22.

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