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Erik G Willcutt

TitleProfessor
InstitutionUniversity of Colorado Boulder
DepartmentPsych-Psychology
Phone303/492-3304

    Collapse Research 
    Collapse research activities and funding
    R01HD068728     (WILLCUTT, ERIK G)Apr 15, 2011 - Jan 31, 2017
    NIH
    Etiology and Neuropsychology of Math, Reading, ADHD, and their Covariation
    Role: Principal Investigator
    R01HD047264     (WILLCUTT, ERIK G)Jul 15, 2005 - May 31, 2012
    NIH
    Etiology of Reading Disabilities and Comorbid ADHD
    Role: Principal Investigator
    R01MH063941     (WILLCUTT, ERIK G)Sep 10, 2001 - Jun 30, 2007
    NIH
    Validity of DSM-IV ADHD Subtypes in a Community Sample
    Role: Principal Investigator
    R01MH062120     (WILLCUTT, ERIK G)Aug 15, 2000 - Jul 31, 2006
    NIH
    DSM-IV ADHD IN AN ETHNICALLY DIVERSE COMMUNITY SAMPLE
    Role: Principal Investigator
    F32MH012100     (WILLCUTT, ERIK G)Feb 20, 1999
    NIH
    BEHAVIORAL AND MOLECULAR GENETIC STUDY OF ADHD
    Role: Principal Investigator
    P50HD027802     (WILLCUTT, ERIK G)Sep 30, 1990 - Jul 31, 2028
    NIH
    Differential Diagnosis in Learning Disabilities
    Role: Principal Investigator

    Collapse Bibliographic 
    Collapse selected publications
    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Faculty can login to make corrections and additions.
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    1. Petrill SA, Klamer BG, Buyske S, Willcutt EG, Gruen JR, Francis DJ, Flax JF, Brzustowicz LM, Bartlett CW. The Rosetta Phenotype Harmonization Method Facilitates Finding a Relationship Quantitative Trait Locus for a Complex Cognitive Trait. Genes (Basel). 2023 Aug 31; 14(9). PMID: 37761888.
      View in: PubMed
    2. Kramer E, Willcutt EG, Peterson RL, Pennington BF, McGrath LM. Processing Speed is Related to the General Psychopathology Factor in Youth. Res Child Adolesc Psychopathol. 2023 08; 51(8):1179-1193. PMID: 37086335.
      View in: PubMed
    3. Serrano JW, Abu-Ramadan TM, Vasko JM, Leopold DR, Canu WH, Willcutt EG, Hartung CM. ADHD and Psychological Need Fulfillment in College Students. J Atten Disord. 2023 06; 27(8):912-924. PMID: 36924424.
      View in: PubMed
    4. Doust C, Fontanillas P, Eising E, Gordon SD, Wang Z, Alag?z G, Molz B, Pourcain BS, Francks C, Marioni RE, Zhao J, Paracchini S, Talcott JB, Monaco AP, Stein JF, Gruen JR, Olson RK, Willcutt EG, DeFries JC, Pennington BF, Smith SD, Wright MJ, Martin NG, Auton A, Bates TC, Fisher SE, Luciano M. Author Correction: Discovery of 42 genome-wide significant loci associated with dyslexia. Nat Genet. 2023 Mar; 55(3):520. PMID: 36823321.
      View in: PubMed
    5. Trane FE, Willcutt EG. Attention-Deficit/Hyperactivity Disorder and Academic Functioning: Reading, Writing, and Math Abilities in a Community Sample of Youth with and without ADHD. Res Child Adolesc Psychopathol. 2023 04; 51(4):583-596. PMID: 36480079.
      View in: PubMed
    6. Kim H, Wang K, Cutting LE, Willcutt EG, Petrill SA, Leopold DR, Reineberg AE, Thompson LA, Banich MT. The Angular Gyrus as a Hub for Modulation of Language-related Cortex by Distinct Prefrontal Executive Control Regions. J Cogn Neurosci. 2022 11 01; 34(12):2275-2296. PMID: 36122356.
      View in: PubMed
    7. Doust C, Fontanillas P, Eising E, Gordon SD, Wang Z, Alag?z G, Molz B, Pourcain BS, Francks C, Marioni RE, Zhao J, Paracchini S, Talcott JB, Monaco AP, Stein JF, Gruen JR, Olson RK, Willcutt EG, DeFries JC, Pennington BF, Smith SD, Wright MJ, Martin NG, Auton A, Bates TC, Fisher SE, Luciano M. Discovery of 42 genome-wide significant loci associated with dyslexia. Nat Genet. 2022 11; 54(11):1621-1629. PMID: 36266505.
      View in: PubMed
    8. Eising E, Mirza-Schreiber N, de Zeeuw EL, Wang CA, Truong DT, Allegrini AG, Shapland CY, Zhu G, Wigg KG, Gerritse ML, Molz B, Alag?z G, Gialluisi A, Abbondanza F, Rimfeld K, van Donkelaar M, Liao Z, Jansen PR, Andlauer TFM, Bates TC, Bernard M, Blokland K, Bonte M, B?rglum AD, Bourgeron T, Brandeis D, Ceroni F, Cs?pe V, Dale PS, de Jong PF, DeFries JC, D?monet JF, Demontis D, Feng Y, Gordon SD, Guger SL, Hayiou-Thomas ME, Hern?ndez-Cabrera JA, Hottenga JJ, Hulme C, Kere J, Kerr EN, Koomar T, Landerl K, Leonard GT, Lovett MW, Lyytinen H, Martin NG, Martinelli A, Maurer U, Michaelson JJ, Moll K, Monaco AP, Morgan AT, N?then MM, Pausova Z, Pennell CE, Pennington BF, Price KM, Rajagopal VM, Ramus F, Richer L, Simpson NH, Smith SD, Snowling MJ, Stein J, Strug LJ, Talcott JB, Tiemeier H, van der Schroeff MP, Verhoef E, Watkins KE, Wilkinson M, Wright MJ, Barr CL, Boomsma DI, Carreiras M, Franken MJ, Gruen JR, Luciano M, M?ller-Myhsok B, Newbury DF, Olson RK, Paracchini S, Paus T, Plomin R, Reilly S, Schulte-K?rne G, Tomblin JB, van Bergen E, Whitehouse AJO, Willcutt EG, St Pourcain B, Francks C, Fisher SE. Genome-wide analyses of individual differences in quantitatively assessed reading- and language-related skills in up to 34,000 people. Proc Natl Acad Sci U S A. 2022 08 30; 119(35):e2202764119. PMID: 35998220.
      View in: PubMed
    9. Becker SP, Willcutt EG, Leopold DR, Fredrick JW, Smith ZR, Jacobson LA, Burns GL, Mayes SD, Waschbusch DA, Froehlich TE, McBurnett K, Servera M, Barkley RA. Report of a Work Group on Sluggish Cognitive Tempo: Key Research Directions and a Consensus Change in Terminology to Cognitive Disengagement Syndrome. J Am Acad Child Adolesc Psychiatry. 2023 06; 62(6):629-645. PMID: 36007816.
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    10. Anderson NJ, Rozenman M, Pennington BF, Willcutt EG, McGrath LM. Compounding Effects of Domain-General Cognitive Weaknesses and Word Reading Difficulties on Anxiety Symptoms in Youth. J Learn Disabil. 2023 Sep-Oct; 56(5):343-358. PMID: 35658570.
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    11. Wakeman HN, Wadsworth SJ, Olson RK, DeFries JC, Pennington BF, Willcutt EG. Mathematics Difficulties and Psychopathology in School-Age Children. J Learn Disabil. 2023 Mar-Apr; 56(2):116-131. PMID: 35466804.
      View in: PubMed
    12. Arnett AB, McGrath LM, Flaherty BP, Pennington BF, Willcutt EG. Heritability and Clinical Characteristics of Neuropsychological Profiles in Youth With and Without Elevated ADHD Symptoms. J Atten Disord. 2022 09; 26(11):1422-1436. PMID: 35102766.
      View in: PubMed
    13. Wakeman HN, Leopold DR, Olson RK, Willcutt EG. Modeling the Speeded Determinants of Adolescents' Academic and Attentional Functioning. Dev Neuropsychol. 2022 Mar-Apr; 47(2):61-77. PMID: 34894917.
      View in: PubMed
    14. Shero JA, Logan JAR, Petrill SA, Willcutt E, Hart SA. The Differential Relations Between ADHD and Reading Comprehension: A Quantile Regression and Quantile Genetic Approach. Behav Genet. 2021 11; 51(6):631-653. PMID: 34302587.
      View in: PubMed
    15. Lefler EK, Flory K, Canu WH, Willcutt EG, Hartung CM. Unique considerations in the assessment of ADHD in college students. J Clin Exp Neuropsychol. 2021 05; 43(4):352-369. PMID: 34078248.
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    16. Creque CA, Willcutt EG. Sluggish Cognitive Tempo and Neuropsychological Functioning. Res Child Adolesc Psychopathol. 2021 08; 49(8):1001-1013. PMID: 33755869.
      View in: PubMed
    17. Peterson RL, McGrath LM, Willcutt EG, Keenan JM, Olson RK, Pennington BF. How Specific Are Learning Disabilities? J Learn Disabil. 2021 11; 54(6):466-483. PMID: 33446025.
      View in: PubMed
    18. Canu WH, Stevens AE, Ranson L, Lefler EK, LaCount P, Serrano JW, Willcutt E, Hartung CM. College Readiness: Differences Between First-Year Undergraduates With and Without ADHD. J Learn Disabil. 2021 11; 54(6):403-411. PMID: 33238816.
      View in: PubMed
    19. Gialluisi A, Andlauer TFM, Mirza-Schreiber N, Moll K, Becker J, Hoffmann P, Ludwig KU, Czamara D, Pourcain BS, Honbolyg? F, T?th D, Cs?pe V, Huguet G, Chaix Y, Iannuzzi S, Demonet JF, Morris AP, Hulslander J, Willcutt EG, DeFries JC, Olson RK, Smith SD, Pennington BF, Vaessen A, Maurer U, Lyytinen H, Peyrard-Janvid M, Lepp?nen PHT, Brandeis D, Bonte M, Stein JF, Talcott JB, Fauchereau F, Wilcke A, Kirsten H, M?ller B, Francks C, Bourgeron T, Monaco AP, Ramus F, Landerl K, Kere J, Scerri TS, Paracchini S, Fisher SE, Schumacher J, N?then MM, M?ller-Myhsok B, Schulte-K?rne G. Genome-wide association study reveals new insights into the heritability and genetic correlates of developmental dyslexia. Mol Psychiatry. 2021 07; 26(7):3004-3017. PMID: 33057169.
      View in: PubMed
    20. Slomowitz RF, Narayan AJ, Pennington BF, Olson RK, DeFries JC, Willcutt EG, McGrath LM. In Search of Cognitive Promotive and Protective Factors for Word Reading. Sci Stud Read. 2021; 25(5):397-416. PMID: 34650325.
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    21. Wang K, Banich MT, Reineberg AE, Leopold DR, Willcutt EG, Cutting LE, Del Tufo SN, Thompson LA, Opfer J, Kanayet FJ, Lu ZL, Petrill SA. Left posterior prefrontal regions support domain-general executive processes needed for both reading and math. J Neuropsychol. 2020 09; 14(3):467-495. PMID: 32034941.
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    22. MacDonald B, Pennington BF, Willcutt EG, Dmitrieva J, Samuelsson S, Byrne B, Olson RK. Cross-Country Differences in Parental Reporting of Symptoms of ADHD. J Cross Cult Psychol. 2019 Jul; 50(6):806-824. PMID: 31303678.
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    23. Willcutt EG. Behavior and Molecular Genetic Approaches to Comorbidity. Curr Dev Disord Rep. 2019 Jun; 6(2):31-36. PMID: 32042548.
      View in: PubMed
    24. Grigorenko EL, Compton DL, Fuchs LS, Wagner RK, Willcutt EG, Fletcher JM. Understanding, educating, and supporting children with specific learning disabilities: 50 years of science and practice. Am Psychol. 2020 01; 75(1):37-51. PMID: 31081650.
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    25. Willcutt EG, McGrath LM, Pennington BF, Keenan JM, DeFries JC, Olson RK, Wadsworth SJ. Understanding Comorbidity Between Specific Learning Disabilities. New Dir Child Adolesc Dev. 2019 May; 2019(165):91-109. PMID: 31070302.
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    26. Wang K, Leopold DR, Banich MT, Reineberg AE, Willcutt EG, Cutting LE, Del Tufo SN, Thompson LA, Opfer J, Kanayet FJ, Lu ZL, Petrill SA. Characterizing and decomposing the neural correlates of individual differences in reading ability among adolescents with task-based fMRI. Dev Cogn Neurosci. 2019 06; 37:100647. PMID: 31059925.
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    27. Truong DT, Adams AK, Paniagua S, Frijters JC, Boada R, Hill DE, Lovett MW, Mahone EM, Willcutt EG, Wolf M, Defries JC, Gialluisi A, Francks C, Fisher SE, Olson RK, Pennington BF, Smith SD, Bosson-Heenan J, Gruen JR. Multivariate genome-wide association study of rapid automatised naming and rapid alternating stimulus in Hispanic American and African-American youth. J Med Genet. 2019 08; 56(8):557-566. PMID: 30995994.
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    28. Burns GL, Becker SP, Geiser C, Leopold DR, Willcutt EG. Are Sluggish Cognitive Tempo, ADHD, and Oppositional Defiant Disorder Trait- or State-Like Constructs from Prekindergarten to Fourth Grade? J Clin Child Adolesc Psychol. 2020 Jul-Aug; 49(4):460-468. PMID: 30985190.
      View in: PubMed
    29. Vu A, Thompson L, Willcutt E, Petrill S. Sluggish cognitive tempo: longitudinal stability and validity. Atten Defic Hyperact Disord. 2019 Dec; 11(4):463-471. PMID: 30788768.
      View in: PubMed
    30. Gialluisi A, Andlauer TFM, Mirza-Schreiber N, Moll K, Becker J, Hoffmann P, Ludwig KU, Czamara D, St Pourcain B, Brandler W, Honbolyg? F, T?th D, Cs?pe V, Huguet G, Morris AP, Hulslander J, Willcutt EG, DeFries JC, Olson RK, Smith SD, Pennington BF, Vaessen A, Maurer U, Lyytinen H, Peyrard-Janvid M, Lepp?nen PHT, Brandeis D, Bonte M, Stein JF, Talcott JB, Fauchereau F, Wilcke A, Francks C, Bourgeron T, Monaco AP, Ramus F, Landerl K, Kere J, Scerri TS, Paracchini S, Fisher SE, Schumacher J, N?then MM, M?ller-Myhsok B, Schulte-K?rne G. Genome-wide association scan identifies new variants associated with a cognitive predictor of dyslexia. Transl Psychiatry. 2019 02 11; 9(1):77. PMID: 30741946.
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    31. Leopold DR, Christopher ME, Olson RK, Petrill SA, Willcutt EG. Invariance of ADHD Symptoms Across Sex and Age: a Latent Analysis of ADHD and Impairment Ratings from Early Childhood into Adolescence. J Abnorm Child Psychol. 2019 01; 47(1):21-34. PMID: 29691720.
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    32. Tsujimoto KC, Boada R, Gottwald S, Hill D, Jacobson LA, Lovett M, Mahone EM, Willcutt E, Wolf M, Bosson-Heenan J, Gruen JR, Frijters JC. Causal Attribution Profiles as a Function of Reading Skills, Hyperactivity, and Inattention. Sci Stud Read. 2019; 23(3):254-272. PMID: 32523329.
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    33. Becker SP, Burns GL, Leopold DR, Olson RK, Willcutt EG. Differential impact of trait sluggish cognitive tempo and ADHD inattention in early childhood on adolescent functioning. J Child Psychol Psychiatry. 2018 10; 59(10):1094-1104. PMID: 29957822.
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    34. Child AE, Cirino PT, Fletcher JM, Willcutt EG, Fuchs LS. A Cognitive Dimensional Approach to Understanding Shared and Unique Contributions to Reading, Math, and Attention Skills. J Learn Disabil. 2019 Jan/Feb; 52(1):15-30. PMID: 29779434.
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    35. Tsujimoto KC, Frijters JC, Boada R, Gottwald S, Hill D, Jacobson LA, Lovett MW, Mahone EM, Willcutt EG, Wolf M, Bosson-Heenan J, Gruen JR. Achievement attributions are associated with specific rather than general learning delays. Learn Individ Differ. 2018 May; 64:8-21. PMID: 32523322.
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    36. Becker SP, Willcutt EG. Advancing the study of sluggish cognitive tempo via DSM, RDoC, and hierarchical models of psychopathology. Eur Child Adolesc Psychiatry. 2019 May; 28(5):603-613. PMID: 29524018.
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    37. Lukowski SL, Rosenberg-Lee M, Thompson LA, Hart SA, Willcutt EG, Olson RK, Petrill SA, Pennington BF. Approximate Number Sense Shares Etiological Overlap with Mathematics and General Cognitive Ability. Intelligence. 2017 Nov; 65:67-74. PMID: 29867283.
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    38. Adams AK, Smith SD, Truong DT, Willcutt EG, Olson RK, DeFries JC, Pennington BF, Gruen JR. Enrichment of putatively damaging rare variants in the DYX2 locus and the reading-related genes CCDC136 and FLNC. Hum Genet. 2017 11; 136(11-12):1395-1405. PMID: 28866788.
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    39. Wu SS, Chen L, Battista C, Smith Watts AK, Willcutt EG, Menon V. Distinct influences of affective and cognitive factors on children's non-verbal and verbal mathematical abilities. Cognition. 2017 09; 166:118-129. PMID: 28558312.
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    40. Frijters JC, Tsujimoto KC, Boada R, Gottwald S, Hill D, Jacobson LA, Lovett MW, Mahone EM, Willcutt EG, Wolf M, Bosson-Heenan J, Gruen JR. Reading-Related Causal Attributions for Success and Failure: Dynamic Links With Reading Skill. Read Res Q. 2018 Jan-Mar; 53(1):127-148. PMID: 29391653.
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    41. Becker SP, Burns GL, Garner AA, Jarrett MA, Luebbe AM, Epstein JN, Willcutt EG. Sluggish cognitive tempo in adults: Psychometric validation of the Adult Concentration Inventory. Psychol Assess. 2018 03; 30(3):296-310. PMID: 28383930.
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    42. 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. PMID: 28176347.
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    43. Cirino PT, Willcutt EG. An Introduction to the Special Issue: Contributions of Executive Function to Academic Skills. J Learn Disabil. 2017 Jul/Aug; 50(4):355-358. PMID: 28095180.
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    44. Livingstone LT, Coventry WL, Corley RP, Willcutt EG, Samuelsson S, Olson RK, Byrne B. Does the Environment Have an Enduring Effect on ADHD? A Longitudinal Study of Monozygotic Twin Differences in Children. J Abnorm Child Psychol. 2016 11; 44(8):1487-1501. PMID: 26993487.
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    45. Wadsworth SJ, DeFries JC, Willcutt EG, Pennington BF, Olson RK. Genetic Etiologies of Comorbidity and Stability for Reading Difficulties and ADHD: A Replication Study. Twin Res Hum Genet. 2016 12; 19(6):647-651. PMID: 27748217.
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    46. Lukowski SL, DiTrapani JB, Jeon M, Wang Z, Schenker VJ, Doran MM, Hart SA, Mazzocco MMM, Willcutt EG, Thompson LA, Petrill SA. Multidimensionality in the Measurement of Math-Specific Anxiety and its Relationship with Mathematical Performance. Learn Individ Differ. 2019 Feb; 70:228-235. PMID: 31011280.
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    47. Gialluisi A, Visconti A, Willcutt EG, Smith SD, Pennington BF, Falchi M, DeFries JC, Olson RK, Francks C, Fisher SE. Investigating the effects of copy number variants on reading and language performance. J Neurodev Disord. 2016; 8:17. PMID: 27186239.
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    48. Christopher ME, Keenan JM, Hulslander J, DeFries JC, Miyake A, Wadsworth SJ, Willcutt E, Pennington B, Olson RK. The genetic and environmental etiologies of the relations between cognitive skills and components of reading ability. J Exp Psychol Gen. 2016 Apr; 145(4):451-66. PMID: 26974208.
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    49. Hartung CM, Lefler EK, Canu WH, Stevens AE, Jaconis M, LaCount PA, Shelton CR, Leopold DR, Willcutt EG. DSM-5 and Other Symptom Thresholds for ADHD: Which Is the Best Predictor of Impairment in College Students? J Atten Disord. 2019 11 01; 23(13):1637-1646. PMID: 26903353.
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    50. Peterson RL, Boada R, McGrath LM, Willcutt EG, Olson RK, Pennington BF. Cognitive Prediction of Reading, Math, and Attention: Shared and Unique Influences. J Learn Disabil. 2017 Jul/Aug; 50(4):408-421. PMID: 26825667.
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    51. Jacobson LA, Koriakin T, Lipkin P, Boada R, Frijters JC, Lovett MW, Hill D, Willcutt E, Gottwald S, Wolf M, Bosson-Heenan J, Gruen JR, Mahone EM. Executive Functions Contribute Uniquely to Reading Competence in Minority Youth. J Learn Disabil. 2017 Jul/Aug; 50(4):422-433. PMID: 26755569.
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    52. Leopold DR, Christopher ME, Burns GL, Becker SP, Olson RK, Willcutt EG. Attention-deficit/hyperactivity disorder and sluggish cognitive tempo throughout childhood: temporal invariance and stability from preschool through ninth grade. J Child Psychol Psychiatry. 2016 09; 57(9):1066-74. PMID: 26749438.
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    53. Becker SP, Leopold DR, Burns GL, Jarrett MA, Langberg JM, Marshall SA, McBurnett K, Waschbusch DA, Willcutt EG. The Internal, External, and Diagnostic Validity of Sluggish Cognitive Tempo: A Meta-Analysis and Critical Review. J Am Acad Child Adolesc Psychiatry. 2016 Mar; 55(3):163-78. PMID: 26903250.
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    54. Wang Z, Soden B, Deater-Deckard K, Lukowski SL, Schenker VJ, Willcutt EG, Thompson LA, Petrill SA. Development in reading and math in children from different SES backgrounds: the moderating role of child temperament. Dev Sci. 2017 05; 20(3). PMID: 26689998.
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    55. Powers NR, Eicher JD, Miller LL, Kong Y, Smith SD, Pennington BF, Willcutt EG, Olson RK, Ring SM, Gruen JR. The regulatory element READ1 epistatically influences reading and language, with both deleterious and protective alleles. J Med Genet. 2016 Mar; 53(3):163-71. PMID: 26660103.
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    56. Wadsworth SJ, DeFries JC, Willcutt EG, Pennington BF, Olson RK. The Colorado Longitudinal Twin Study of Reading Difficulties and ADHD: Etiologies of Comorbidity and Stability. Twin Res Hum Genet. 2015 Dec; 18(6):755-61. PMID: 26537134.
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    57. McGrath LM, Braaten EB, Doty ND, Willoughby BL, Wilson HK, O'Donnell EH, Colvin MK, Ditmars HL, Blais JE, Hill EN, Metzger A, Perlis RH, Willcutt EG, Smoller JW, Waldman ID, Faraone SV, Seidman LJ, Doyle AE. Extending the 'cross-disorder' relevance of executive functions to dimensional neuropsychiatric traits in youth. J Child Psychol Psychiatry. 2016 Apr; 57(4):462-71. PMID: 26411927.
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    58. Godinez DA, Willcutt EG, Burgess GC, Depue BE, Andrews-Hanna JR, Banich MT. Familial risk and ADHD-specific neural activity revealed by case-control, discordant twin pair design. Psychiatry Res. 2015 Sep 30; 233(3):458-65. PMID: 26256128.
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    59. Soden B, Christopher ME, Hulslander J, Olson RK, Cutting L, Keenan JM, Thompson LA, Wadsworth SJ, Willcutt EG, Petrill SA. Longitudinal stability in reading comprehension is largely heritable from grades 1 to 6. PLoS One. 2015; 10(1):e0113807. PMID: 25602760.
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    60. Keenan JM, Hua AN, Meenan CE, Pennington BF, Willcutt E, Olson RK. Issues in Identifying Poor Comprehenders. Annee Psychol. 2014 Dec 01; 114(4):753-777. PMID: 25937640.
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    61. Leopold DR, Bryan AD, Pennington BF, Willcutt EG. Evaluating the construct validity of adult ADHD and SCT among college students: a multitrait-multimethod analysis of convergent and discriminant validity. J Atten Disord. 2015 Mar; 19(3):200-10. PMID: 25304149.
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    62. Arnett AB, Pennington BF, Willcutt EG, DeFries JC, Olson RK. Sex differences in ADHD symptom severity. J Child Psychol Psychiatry. 2015 Jun; 56(6):632-9. PMID: 25283790.
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    63. Christopher ME, Hulslander J, Byrne B, Samuelsson S, Keenan JM, Pennington B, DeFries JC, Wadsworth SJ, Willcutt E, Olson RK. Genetic and environmental etiologies of the longitudinal relations between prereading skills and reading. Child Dev. 2015 Mar-Apr; 86(2):342-61. PMID: 25263167.
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    64. Wu SS, Mittal V, Pennington B, Willcutt EG. Mathematics achievement scores and early psychosis in school-aged children. Schizophr Res. 2014 Jun; 156(1):133-4. PMID: 24768132.
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    65. Tamm L, Epstein JN, Denton CA, Vaughn AJ, Peugh J, Willcutt EG. Reaction time variability associated with reading skills in poor readers with ADHD. J Int Neuropsychol Soc. 2014 Mar; 20(3):292-301. PMID: 24528537.
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    66. Eicher JD, Powers NR, Miller LL, Mueller KL, Mascheretti S, Marino C, Willcutt EG, DeFries JC, Olson RK, Smith SD, Pennington BF, Tomblin JB, Ring SM, Gruen JR. Characterization of the DYX2 locus on chromosome 6p22 with reading disability, language impairment, and IQ. Hum Genet. 2014 Jul; 133(7):869-81. PMID: 24509779.
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    67. Brodsky K, Willcutt EG, Davalos DB, Ross RG. Neuropsychological functioning in childhood-onset psychosis and attention-deficit/hyperactivity disorder. J Child Psychol Psychiatry. 2014 Jul; 55(7):811-8. PMID: 24456282.
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    68. Polanczyk GV, Willcutt EG, Salum GA, Kieling C, Rohde LA. ADHD prevalence estimates across three decades: an updated systematic review and meta-regression analysis. Int J Epidemiol. 2014 Apr; 43(2):434-42. PMID: 24464188.
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    69. Willcutt EG, Chhabildas N, Kinnear M, DeFries JC, Olson RK, Leopold DR, Keenan JM, Pennington BF. The internal and external validity of sluggish cognitive tempo and its relation with DSM-IV ADHD. J Abnorm Child Psychol. 2014 Jan; 42(1):21-35. PMID: 24122408.
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    70. Bidwell LC, Henry EA, Willcutt EG, Kinnear MK, Ito TA. Childhood and current ADHD symptom dimensions are associated with more severe cannabis outcomes in college students. Drug Alcohol Depend. 2014 Feb 01; 135:88-94. PMID: 24332802.
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    71. Hoffmann MS, Polanczyk GV, Kieling C, Dos Santos IP, Willcutt EG, Rohde LA, Salum GA. Attention-deficit/hyperactivity disorder and solar irradiance: a cloudy perspective. Biol Psychiatry. 2014 Oct 15; 76(8):e19-20. PMID: 24267411.
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    72. Christopher ME, Hulslander J, Byrne B, Samuelsson S, Keenan JM, Pennington B, Defries JC, Wadsworth SJ, Willcutt E, Olson RK. The genetic and environmental etiologies of individual differences in early reading growth in Australia, the United States, and Scandinavia. J Exp Child Psychol. 2013 Jul; 115(3):453-67. PMID: 23665180.
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    73. Greven CU, Kovas Y, Willcutt EG, Petrill SA, Plomin R. Evidence for shared genetic risk between ADHD symptoms and reduced mathematics ability: a twin study. J Child Psychol Psychiatry. 2014 Jan; 55(1):39-48. PMID: 23731013.
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    74. Miller AC, Keenan JM, Betjemann RS, Willcutt EG, Pennington BF, Olson RK. Reading comprehension in children with ADHD: cognitive underpinnings of the centrality deficit. J Abnorm Child Psychol. 2013 Apr; 41(3):473-83. PMID: 23054132.
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    75. Willcutt EG, Petrill SA, Wu S, Boada R, Defries JC, Olson RK, Pennington BF. Comorbidity between reading disability and math disability: concurrent psychopathology, functional impairment, and neuropsychological functioning. J Learn Disabil. 2013 Nov-Dec; 46(6):500-16. PMID: 23449727.
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    76. Wu SS, Willcutt EG, Escovar E, Menon V. Mathematics achievement and anxiety and their relation to internalizing and externalizing behaviors. J Learn Disabil. 2014 Nov-Dec; 47(6):503-14. PMID: 23313869.
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    77. Christopher ME, Hulslander J, Byrne B, Samuelsson S, Keenan JM, Pennington B, Defries JC, Wadsworth SJ, Willcutt E, Olson RK. Modeling the Etiology of Individual Differences in Early Reading Development: Evidence for Strong Genetic Influences. Sci Stud Read. 2013; 17(5):350-368. PMID: 24489459.
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    78. Arnett AB, Pennington BF, Willcutt E, Dmitrieva J, Byrne B, Samuelsson S, Olson RK. A cross-lagged model of the development of ADHD inattention symptoms and rapid naming speed. J Abnorm Child Psychol. 2012 Nov; 40(8):1313-26. PMID: 22581405.
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    79. Willcutt EG. The prevalence of DSM-IV attention-deficit/hyperactivity disorder: a meta-analytic review. Neurotherapeutics. 2012 Jul; 9(3):490-9. PMID: 22976615.
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    80. Willcutt EG, Nigg JT, Pennington BF, Solanto MV, Rohde LA, Tannock R, Loo SK, Carlson CL, McBurnett K, Lahey BB. Validity of DSM-IV attention deficit/hyperactivity disorder symptom dimensions and subtypes. J Abnorm Psychol. 2012 Nov; 121(4):991-1010. PMID: 22612200.
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    81. Christopher ME, Miyake A, Keenan JM, Pennington B, DeFries JC, Wadsworth SJ, Willcutt E, Olson RK. Predicting word reading and comprehension with executive function and speed measures across development: a latent variable analysis. J Exp Psychol Gen. 2012 Aug; 141(3):470-488. PMID: 22352396.
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    82. Astrom RL, Wadsworth SJ, Olson RK, Willcutt EG, Defries JC. Genetic and environmental etiologies of reading difficulties: DeFries-Fulker analysis of reading performance data from twin pairs and their nontwin siblings. Learn Individ Differ. 2012 Jun 01; 22(3):365-369. PMID: 22927712.
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    83. Wadsworth SJ, Olson RK, Willcutt EG, DeFries JC. Multiple regression analysis of reading performance data from twin pairs with reading difficulties and nontwin siblings: the augmented model. Twin Res Hum Genet. 2012 Feb; 15(1):116-9. PMID: 22784461.
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    84. Arnett AB, Pennington BF, Friend A, Willcutt EG, Byrne B, Samuelsson S, Olson RK. The SWAN captures variance at the negative and positive ends of the ADHD symptom dimension. J Atten Disord. 2013 Feb; 17(2):152-62. PMID: 22173148.
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    85. Pennington BF, Santerre-Lemmon L, Rosenberg J, MacDonald B, Boada R, Friend A, Leopold DR, Samuelsson S, Byrne B, Willcutt EG, Olson RK. Individual prediction of dyslexia by single versus multiple deficit models. J Abnorm Psychol. 2012 Feb; 121(1):212-24. PMID: 22022952.
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    86. Rosenberg J, Pennington BF, Willcutt EG, Olson RK. Gene by environment interactions influencing reading disability and the inattentive symptom dimension of attention deficit/hyperactivity disorder. J Child Psychol Psychiatry. 2012 Mar; 53(3):243-51. PMID: 21884522.
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    87. Willcutt EG, Boada R, Riddle MW, Chhabildas N, DeFries JC, Pennington BF. Colorado Learning Difficulties Questionnaire: validation of a parent-report screening measure. Psychol Assess. 2011 Sep; 23(3):778-91. PMID: 21574721.
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    88. Olson RK, Hulslander J, Christopher M, Keenan JM, Wadsworth SJ, Willcutt EG, Pennington BF, DeFries JC. Genetic and environmental influences on writing and their relations to language and reading. Ann Dyslexia. 2013 Apr; 63(1):25-43. PMID: 21842316.
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    89. Astrom RL, Wadsworth SJ, Olson RK, Willcutt EG, DeFries JC. DeFries-Fulker analysis of longitudinal reading performance data from twin pairs ascertained for reading difficulties and from their nontwin siblings. Behav Genet. 2011 Sep; 41(5):660-7. PMID: 21259040.
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    90. Bidwell LC, Willcutt EG, McQueen MB, DeFries JC, Olson RK, Smith SD, Pennington BF. A family based association study of DRD4, DAT1, and 5HTT and continuous traits of attention-deficit hyperactivity disorder. Behav Genet. 2011 Jan; 41(1):165-74. PMID: 21207241.
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    91. Olson RK, Keenan JM, Byrne B, Samuelsson S, Coventry WL, Corley R, Wadsworth SJ, Willcutt EG, Defries JC, Pennington BF, Hulslander J. Genetic and Environmental Influences on Vocabulary and Reading Development. Sci Stud Read. 2011; 15(1):26-46. PMID: 21132077.
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    92. McGrath LM, Pennington BF, Shanahan MA, Santerre-Lemmon LE, Barnard HD, Willcutt EG, Defries JC, Olson RK. A multiple deficit model of reading disability and attention-deficit/hyperactivity disorder: searching for shared cognitive deficits. J Child Psychol Psychiatry. 2011 May; 52(5):547-57. PMID: 21126246.
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    93. Hart SA, Petrill SA, Willcutt E, Thompson LA, Schatschneider C, Deater-Deckard K, Cutting LE. Exploring how symptoms of attention-deficit/hyperactivity disorder are related to reading and mathematics performance: general genes, general environments. Psychol Sci. 2010 Nov; 21(11):1708-15. PMID: 20966487.
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    94. Depue BE, Burgess GC, Willcutt EG, Ruzic L, Banich MT. Inhibitory control of memory retrieval and motor processing associated with the right lateral prefrontal cortex: evidence from deficits in individuals with ADHD. Neuropsychologia. 2010 Nov; 48(13):3909-17. PMID: 20863843.
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    95. Willcutt EG, Pennington BF, Duncan L, Smith SD, Keenan JM, Wadsworth S, Defries JC, Olson RK. Understanding the complex etiologies of developmental disorders: behavioral and molecular genetic approaches. J Dev Behav Pediatr. 2010 Sep; 31(7):533-44. PMID: 20814254.
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    96. Smith SD, Grigorenko E, Willcutt E, Pennington BF, Olson RK, DeFries JC. Etiologies and molecular mechanisms of communication disorders. J Dev Behav Pediatr. 2010 Sep; 31(7):555-63. PMID: 20814255.
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    97. Willcutt EG, Betjemann RS, McGrath LM, Chhabildas NA, Olson RK, DeFries JC, Pennington BF. Etiology and neuropsychology of comorbidity between RD and ADHD: the case for multiple-deficit models. Cortex. 2010 Nov-Dec; 46(10):1345-61. PMID: 20828676.
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    98. Ebejer JL, Coventry WL, Byrne B, Willcutt EG, Olson RK, Corley R, Samuelsson S. Genetic and Environmental Influences on Inattention, Hyperactivity-Impulsivity, and Reading: Kindergarten to Grade 2. Sci Stud Read. 2010 Jul; 14(4):293-316. PMID: 20823940.
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    99. Depue BE, Burgess GC, Willcutt EG, Bidwell LC, Ruzic L, Banich MT. Symptom-correlated brain regions in young adults with combined-type ADHD: their organization, variability, and relation to behavioral performance. Psychiatry Res. 2010 May 30; 182(2):96-102. PMID: 20399622.
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    100. Depue BE, Burgess GC, Bidwell LC, Willcutt EG, Banich MT. Behavioral performance predicts grey matter reductions in the right inferior frontal gyrus in young adults with combined type ADHD. Psychiatry Res. 2010 Jun 30; 182(3):231-7. PMID: 20493669.
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    101. Betjemann RS, Johnson EP, Barnard H, Boada R, Filley CM, Filipek PA, Willcutt EG, DeFries JC, Pennington BF. Genetic covariation between brain volumes and IQ, reading performance, and processing speed. Behav Genet. 2010 Mar; 40(2):135-45. PMID: 20072853.
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    102. Hulslander J, Olson RK, Willcutt EG, Wadsworth SJ. Longitudinal Stability of Reading-Related Skills and their Prediction of Reading Development. Sci Stud Read. 2010 Mar 01; 14(2):111-136. PMID: 20563241.
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    103. Byrne B, Coventry WL, Olson RK, Wadsworth SJ, Samuelsson S, Petrill SA, Willcutt EG, Corley R. "Teacher Effects" in Early Literacy Development: Evidence from a Study of Twins. J Educ Psychol. 2010 Feb 01; 102(1):32-42. PMID: 20204169.
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    104. Burgess GC, Depue BE, Ruzic L, Willcutt EG, Du YP, Banich MT. Attentional control activation relates to working memory in attention-deficit/hyperactivity disorder. Biol Psychiatry. 2010 Apr 01; 67(7):632-40. PMID: 20060961.
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    105. Lahey BB, Willcutt EG. Predictive validity of a continuous alternative to nominal subtypes of attention-deficit/hyperactivity disorder for DSM-V. J Clin Child Adolesc Psychol. 2010; 39(6):761-75. PMID: 21058124.
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    106. Banich MT, Burgess GC, Depue BE, Ruzic L, Bidwell LC, Hitt-Laustsen S, Du YP, Willcutt EG. The neural basis of sustained and transient attentional control in young adults with ADHD. Neuropsychologia. 2009 Dec; 47(14):3095-104. PMID: 19619566.
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    107. Byrne B, Coventry WL, Olson RK, Samuelsson S, Corley R, Willcutt EG, Wadsworth S, Defries JC. Genetic and Environmental Influences on Aspects of Literacy and Language in Early Childhood: Continuity and Change from Preschool to Grade 2. J Neurolinguistics. 2009 May; 22(3):219-236. PMID: 20161176.
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    108. Friend A, DeFries JC, Olson RK, Pennington B, Harlaar N, Byrne B, Samuelsson S, Willcutt EG, Wadsworth SJ, Corley R, Keenan JM. Heritability of high reading ability and its interaction with parental education. Behav Genet. 2009 Jul; 39(4):427-36. PMID: 19296213.
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    109. Young SE, Friedman NP, Miyake A, Willcutt EG, Corley RP, Haberstick BC, Hewitt JK. Behavioral disinhibition: liability for externalizing spectrum disorders and its genetic and environmental relation to response inhibition across adolescence. J Abnorm Psychol. 2009 Feb; 118(1):117-30. PMID: 19222319.
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    110. Pennington BF, McGrath LM, Rosenberg J, Barnard H, Smith SD, Willcutt EG, Friend A, Defries JC, Olson RK. Gene X environment interactions in reading disability and attention-deficit/hyperactivity disorder. Dev Psychol. 2009 Jan; 45(1):77-89. PMID: 19209992.
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    111. Doyle AE, Ferreira MA, Sklar PB, Lasky-Su J, Petty C, Fusillo SJ, Seidman LJ, Willcutt EG, Smoller JW, Purcell S, Biederman J, Faraone SV. Multivariate genomewide linkage scan of neurocognitive traits and ADHD symptoms: suggestive linkage to 3q13. Am J Med Genet B Neuropsychiatr Genet. 2008 Dec 05; 147B(8):1399-411. PMID: 18973233.
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    112. Sonuga-Barke EJ, Sergeant JA, Nigg J, Willcutt E. Executive dysfunction and delay aversion in attention deficit hyperactivity disorder: nosologic and diagnostic implications. Child Adolesc Psychiatr Clin N Am. 2008 Apr; 17(2):367-84, ix. PMID: 18295151.
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    113. Samuelsson S, Byrne B, Olson RK, Hulslander J, Wadsworth S, Corley R, Willcutt EG, Defries JC. Response to early literacy instruction in the United States, Australia, and Scandinavia: A behavioral-genetic analysis. Learn Individ Differ. 2008; 18(3):289-295. PMID: 19122888.
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    114. Wadsworth SJ, DeFries JC, Olson RK, Willcutt EG. Colorado longitudinal twin study of reading disability. Ann Dyslexia. 2007 Dec; 57(2):139-60. PMID: 18060583.
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    115. Friedman NP, Haberstick BC, Willcutt EG, Miyake A, Young SE, Corley RP, Hewitt JK. Greater attention problems during childhood predict poorer executive functioning in late adolescence. Psychol Sci. 2007 Oct; 18(10):893-900. PMID: 17894607.
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    116. Willcutt EG, Pennington BF, Olson RK, DeFries JC. Understanding comorbidity: a twin study of reading disability and attention-deficit/hyperactivity disorder. Am J Med Genet B Neuropsychiatr Genet. 2007 Sep 05; 144B(6):709-14. PMID: 17440942.
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    117. Rhee SH, Willcutt EG, Hartman CA, Pennington BF, DeFries JC. Test of alternative hypotheses explaining the comorbidity between attention-deficit/hyperactivity disorder and conduct disorder. J Abnorm Child Psychol. 2008 Jan; 36(1):29-40. PMID: 17636436.
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    118. Bidwell LC, Willcutt EG, Defries JC, Pennington BF. Testing for neuropsychological endophenotypes in siblings discordant for attention-deficit/hyperactivity disorder. Biol Psychiatry. 2007 Nov 01; 62(9):991-8. PMID: 17585884.
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    119. Hartman CA, Rhee SH, Willcutt EG, Pennington BF. Modeling rater disagreement for ADHD: are parents or teachers biased? J Abnorm Child Psychol. 2007 Aug; 35(4):536-42. PMID: 17333362.
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    120. McGrath LM, Pennington BF, Willcutt EG, Boada R, Shriberg LD, Smith SD. Gene x Environment interactions in speech sound disorder predict language and preliteracy outcomes. Dev Psychopathol. 2007; 19(4):1047-72. PMID: 17931434.
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    121. Frank MJ, Santamaria A, O'Reilly RC, Willcutt E. Testing computational models of dopamine and noradrenaline dysfunction in attention deficit/hyperactivity disorder. Neuropsychopharmacology. 2007 Jul; 32(7):1583-99. PMID: 17164816.
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    122. Shanahan MA, Pennington BF, Yerys BE, Scott A, Boada R, Willcutt EG, Olson RK, DeFries JC. Processing speed deficits in attention deficit/hyperactivity disorder and reading disability. J Abnorm Child Psychol. 2006 Oct; 34(5):585-602. PMID: 16850284.
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    123. Gay?n J, Willcutt EG, Fisher SE, Francks C, Cardon LR, Olson RK, Pennington BF, Smith SD, Monaco AP, DeFries JC. Bivariate linkage scan for reading disability and attention-deficit/hyperactivity disorder localizes pleiotropic loci. J Child Psychol Psychiatry. 2005 Oct; 46(10):1045-56. PMID: 16178928.
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    124. Todd RD, Huang H, Smalley SL, Nelson SF, Willcutt EG, Pennington BF, Smith SD, Faraone SV, Neuman RJ. Collaborative analysis of DRD4 and DAT genotypes in population-defined ADHD subtypes. J Child Psychol Psychiatry. 2005 Oct; 46(10):1067-73. PMID: 16178930.
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    125. Lahey BB, Pelham WE, Loney J, Lee SS, Willcutt E. Instability of the DSM-IV Subtypes of ADHD from preschool through elementary school. Arch Gen Psychiatry. 2005 Aug; 62(8):896-902. PMID: 16061767.
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    126. Rhee SH, Hewitt JK, Corley RP, Willcutt EG, Pennington BF. Testing hypotheses regarding the causes of comorbidity: examining the underlying deficits of comorbid disorders. J Abnorm Psychol. 2005 Aug; 114(3):346-62. PMID: 16117572.
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    127. Doyle AE, Faraone SV, Seidman LJ, Willcutt EG, Nigg JT, Waldman ID, Pennington BF, Peart J, Biederman J. Are endophenotypes based on measures of executive functions useful for molecular genetic studies of ADHD? J Child Psychol Psychiatry. 2005 Jul; 46(7):774-803. PMID: 15972070.
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    128. Doyle AE, Willcutt EG, Seidman LJ, Biederman J, Chouinard VA, Silva J, Faraone SV. Attention-deficit/hyperactivity disorder endophenotypes. Biol Psychiatry. 2005 Jun 01; 57(11):1324-35. PMID: 15950005.
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    129. Willcutt EG, Doyle AE, Nigg JT, Faraone SV, Pennington BF. Validity of the executive function theory of attention-deficit/hyperactivity disorder: a meta-analytic review. Biol Psychiatry. 2005 Jun 01; 57(11):1336-46. PMID: 15950006.
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    130. Nigg JT, Willcutt EG, Doyle AE, Sonuga-Barke EJ. Causal heterogeneity in attention-deficit/hyperactivity disorder: do we need neuropsychologically impaired subtypes? Biol Psychiatry. 2005 Jun 01; 57(11):1224-30. PMID: 15949992.
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    131. Stevenson J, Asherson P, Hay D, Levy F, Swanson J, Thapar A, Willcutt E. Characterizing the ADHD phenotype for genetic studies. Dev Sci. 2005 Mar; 8(2):115-21. PMID: 15720369.
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    132. Banaschewski T, Hollis C, Oosterlaan J, Roeyers H, Rubia K, Willcutt E, Taylor E. Towards an understanding of unique and shared pathways in the psychopathophysiology of ADHD. Dev Sci. 2005 Mar; 8(2):132-40. PMID: 15720371.
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    133. Willcutt EG, Pennington BF, Olson RK, Chhabildas N, Hulslander J. Neuropsychological analyses of comorbidity between reading disability and attention deficit hyperactivity disorder: in search of the common deficit. Dev Neuropsychol. 2005; 27(1):35-78. PMID: 15737942.
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    134. Pennington BF, Willcutt E, Rhee SH. Analyzing comorbidity. Adv Child Dev Behav. 2005; 33:263-304. PMID: 16101120.
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    135. Lahey BB, Pelham WE, Loney J, Kipp H, Ehrhardt A, Lee SS, Willcutt EG, Hartung CM, Chronis A, Massetti G. Three-year predictive validity of DSM-IV attention deficit hyperactivity disorder in children diagnosed at 4-6 years of age. Am J Psychiatry. 2004 Nov; 161(11):2014-20. PMID: 15514401.
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    136. Hartman CA, Willcutt EG, Rhee SH, Pennington BF. The relation between sluggish cognitive tempo and DSM-IV ADHD. J Abnorm Child Psychol. 2004 Oct; 32(5):491-503. PMID: 15500029.
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    137. Hulslander J, Talcott J, Witton C, DeFries J, Pennington B, Wadsworth S, Willcutt E, Olson R. Sensory processing, reading, IQ, and attention. J Exp Child Psychol. 2004 Jul; 88(3):274-95. PMID: 15203301.
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    138. Friedman MC, Chhabildas N, Budhiraja N, Willcutt EG, Pennington BF. Etiology of the comorbidity between RD and ADHD: exploration of the non-random mating hypothesis. Am J Med Genet B Neuropsychiatr Genet. 2003 Jul 01; 120B(1):109-15. PMID: 12815748.
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    139. Nigg JT, John OP, Blaskey LG, Huang-Pollock CL, Willcutt EG, Hinshaw SP, Pennington B. Big five dimensions and ADHD symptoms: links between personality traits and clinical symptoms. J Pers Soc Psychol. 2002 Aug; 83(2):451-469. PMID: 12150240.
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    140. Willcutt EG, Pennington BF, Smith SD, Cardon LR, Gay?n J, Knopik VS, Olson RK, DeFries JC. Quantitative trait locus for reading disability on chromosome 6p is pleiotropic for attention-deficit/hyperactivity disorder. Am J Med Genet. 2002 Apr 08; 114(3):260-8. PMID: 11920845.
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    141. Chhabildas N, Pennington BF, Willcutt EG. A comparison of the neuropsychological profiles of the DSM-IV subtypes of ADHD. J Abnorm Child Psychol. 2001 Dec; 29(6):529-40. PMID: 11761286.
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    142. Willcutt EG, Pennington BF, Boada R, Ogline JS, Tunick RA, Chhabildas NA, Olson RK. A comparison of the cognitive deficits in reading disability and attention-deficit/hyperactivity disorder. J Abnorm Psychol. 2001 Feb; 110(1):157-72. PMID: 11261391.
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    143. Willcutt EG, Pennington BF. Psychiatric comorbidity in children and adolescents with reading disability. J Child Psychol Psychiatry. 2000 Nov; 41(8):1039-48. PMID: 11099120.
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    144. Willcutt EG, Pennington BF, DeFries JC. Twin study of the etiology of comorbidity between reading disability and attention-deficit/hyperactivity disorder. Am J Med Genet. 2000 Jun 12; 96(3):293-301. PMID: 10898903.
      View in: PubMed
    145. Willcutt EG, Pennington BF, DeFries JC. Etiology of inattention and hyperactivity/impulsivity in a community sample of twins with learning difficulties. J Abnorm Child Psychol. 2000 Apr; 28(2):149-59. PMID: 10834767.
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    146. Willcutt EG, Pennington BF. Comorbidity of reading disability and attention-deficit/hyperactivity disorder: differences by gender and subtype. J Learn Disabil. 2000 Mar-Apr; 33(2):179-91. PMID: 15505947.
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    147. Willcutt EG, Hartung CM, Lahey BB, Loney J, Pelham WE. Utility of behavior ratings by examiners during assessments of preschool children with attention-deficit/hyperactivity disorder. J Abnorm Child Psychol. 1999 Dec; 27(6):463-72. PMID: 10821628.
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    148. Willcutt EG, Pennington BF, Chhabildas NA, Friedman MC, Alexander J. Psychiatric comorbidity associated with DSM-IV ADHD in a nonreferred sample of twins. J Am Acad Child Adolesc Psychiatry. 1999 Nov; 38(11):1355-62. PMID: 10560221.
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    149. McBurnett K, Pfiffner LJ, Willcutt E, Tamm L, Lerner M, Ottolini YL, Furman MB. Experimental cross-validation of DSM-IV types of attention-deficit/hyperactivity disorder. J Am Acad Child Adolesc Psychiatry. 1999 Jan; 38(1):17-24. PMID: 9893412.
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    150. Lahey BB, Pelham WE, Stein MA, Loney J, Trapani C, Nugent K, Kipp H, Schmidt E, Lee S, Cale M, Gold E, Hartung CM, Willcutt E, Baumann B. Validity of DSM-IV attention-deficit/hyperactivity disorder for younger children. J Am Acad Child Adolesc Psychiatry. 1998 Jul; 37(7):695-702. PMID: 9666624.
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