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Richard Kellogg Olson

TitleSr Research Associate
InstitutionUniversity of Colorado Boulder
DepartmentInstitute for Behav Genetics
Phone303/492-8865
ORCID ORCID Icon0000-0003-3769-1936 Additional info

    Collapse Research 
    Collapse research activities and funding
    R01HD022223     (OLSON, RICHARD K)Jan 1, 1987 - Dec 31, 1999
    NIH/NICHD
    COMPUTER-SPEECH FEEDBACK IN TEXT FOR DYSLEXIC CHILDREN
    Role: Principal Investigator

    P50HD027802     (WILLCUTT, ERIK G)Sep 30, 1990 - Jul 31, 2022
    NIH/NICHD
    Differential Diagnosis in Learning Disabilities
    Role: Principal Investigator

    R01HD038526     (OLSON, RICHARD K)Mar 15, 2000 - May 31, 2013
    NIH/NICHD
    Longitudinal Twin Study--Early Reading Development
    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. 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 Sep 02. PMID: 28866788.
      View in: PubMed
    2. Grasby KL, Coventry WL, Byrne B, Olson RK. Little Evidence That Socioeconomic Status Modifies Heritability of Literacy and Numeracy in Australia. Child Dev. 2017 Aug 18. PMID: 28832969.
      View in: PubMed
    3. Peterson RL, Arnett AB, Pennington BF, Byrne B, Samuelsson S, Olson RK. Literacy acquisition influences children's rapid automatized naming. Dev Sci. 2017 Aug 15. PMID: 28812316.
      View in: PubMed
    4. Burrows T, Goldman S, Olson RK, Byrne B, Coventry WL. Associations between selected dietary behaviours and academic achievement: A study of Australian school aged children. Appetite. 2017 Sep 01; 116:372-380. PMID: 28487248.
      View in: PubMed
    5. Gould KL, Coventry WL, Olson RK, Byrne B. Gene-Environment Interactions in ADHD: The Roles of SES and Chaos. J Abnorm Child Psychol. 2017 Mar 10. PMID: 28283857.
      View in: PubMed
    6. 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.
      View in: PubMed
    7. 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.
      View in: PubMed
    8. 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 Dec; 19(6):647-651. PMID: 27748217.
      View in: PubMed
    9. Treiman R, Kessler B, Pollo TC, Byrne B, Olson RK. Measures of Kindergarten Spelling and Their Relations to Later Spelling Performance. Sci Stud Read. 2016; 20(5):349-362. PMID: 27761101.
      View in: PubMed
    10. Grasby KL, Coventry WL, Byrne B, Olson RK, Medland SE. Genetic and Environmental Influences on Literacy and Numeracy Performance in Australian School Children in Grades 3, 5, 7, and 9. Behav Genet. 2016 Sep; 46(5):627-648. PMID: 27276978.
      View in: PubMed
    11. 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; PMCID: PMC4868026.
    12. 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; PMCID: PMC4792094 [Available on 04/01/17].
    13. 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.
      View in: PubMed
    14. 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 Sep; 57(9):1066-74. PMID: 26749438; PMCID: PMC4938772 [Available on 09/01/17].
    15. 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; PMCID: PMC4789805.
    16. 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; PMCID: PMC4684790 [Available on 12/01/16].
    17. Grasby KL, Byrne B, Olson RK. Validity of large-scale reading tests: A phenotypic and behaviour-genetic analysis. Aust J Educ. 2015 Apr; 59(1):5-21. PMID: 27721516.
      View in: PubMed
    18. 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; PMCID: PMC4300224.
    19. Elwér Å, Gustafson S, Byrne B, Olson RK, Keenan JM, Samuelsson S. A retrospective longitudinal study of cognitive and language skills in poor reading comprehension. Scand J Psychol. 2015 Apr; 56(2):157-66. PMID: 25581078; PMCID: PMC4356634.
    20. Olson RK, Keenan JM, Byrne B, Samuelsson S. Why do Children Differ in Their Development of Reading and Related Skills? Sci Stud Read. 2014 Dec 31; 18(1):38-54. PMID: 25104901.
      View in: PubMed
    21. 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.
      View in: PubMed
    22. 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; PMCID: PMC4385512.
    23. 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; PMCID: PMC4375099.
    24. 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; PMCID: PMC4053598.
    25. 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; PMCID: PMC3947432.
    26. Peterson RL, Pennington BF, Olson RK, Wadsworth S. Longitudinal Stability of Phonological and Surface Subtypes of Developmental Dyslexia. Sci Stud Read. 2014; 18(5):347-362. PMID: 25429194.
      View in: PubMed
    27. 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; PMCID: PMC3661747.
    28. 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; PMCID: PMC3561476.
    29. Fujisawa KK, Wadsworth SJ, Kakihana S, Olson RK, Defries JC, Byrne B, Ando J. A multivariate twin study of early literacy in Japanese Kana. Learn Individ Differ. 2013 Apr 01; 24:160-167. PMID: 23997545.
      View in: PubMed
    30. Elwér S, Keenan JM, Olson RK, Byrne B, Samuelsson S. Longitudinal stability and predictors of poor oral comprehenders and poor decoders. J Exp Child Psychol. 2013 Jul; 115(3):497-516. PMID: 23528975; PMCID: PMC3661702.
    31. 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; PMCID: PMC3749272.
    32. Byrne B, Wadsworth SJ, Boehme K, Talk AC, Coventry WL, Olson RK, Samuelsson S, Corley R. Multivariate genetic analysis of learning and early reading development. Sci Stud Read. 2013 Jan 01; 17(3):224-242. PMID: 23626456.
      View in: PubMed
    33. 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.
      View in: PubMed
    34. Peterson RL, Pennington BF, Samuelsson S, Byrne B, Olson RK. Shared etiology of phonological memory and vocabulary deficits in school-age children. J Speech Lang Hear Res. 2013 Aug; 56(4):1249-59. PMID: 23275423; PMCID: PMC3615120.
    35. 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; PMCID: PMC3546520.
    36. Peterson RL, Pennington BF, Olson RK. Subtypes of developmental dyslexia: testing the predictions of the dual-route and connectionist frameworks. Cognition. 2013 Jan; 126(1):20-38. PMID: 23010562; PMCID: PMC3491101.
    37. Anthoni H, Sucheston LE, Lewis BA, Tapia-Páez I, Fan X, Zucchelli M, Taipale M, Stein CM, Hokkanen ME, Castrén E, Pennington BF, Smith SD, Olson RK, Tomblin JB, Schulte-Körne G, Nöthen M, Schumacher J, Müller-Myhsok B, Hoffmann P, Gilger JW, Hynd GW, Nopola-Hemmi J, Leppanen PH, Lyytinen H, Schoumans J, Nordenskjöld M, Spencer J, Stanic D, Boon WC, Simpson E, Mäkelä S, Gustafsson JÅ, Peyrard-Janvid M, Iyengar S, Kere J. The aromatase gene CYP19A1: several genetic and functional lines of evidence supporting a role in reading, speech and language. Behav Genet. 2012 Jul; 42(4):509-27. PMID: 22426781; PMCID: PMC3375077.
    38. 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):470-88. PMID: 22352396; PMCID: PMC3360115.
    39. 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.
      View in: PubMed
    40. 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; PMCID: PMC3398740.
    41. 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; PMCID: PMC3330134.
    42. 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; PMCID: PMC3270218.
    43. 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; PMCID: PMC3235245.
    44. 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; PMCID: PMC3218215.
    45. Coventry WL, Byrne B, Olson RK, Corley R, Samuelsson S. Dynamic and static assessment of phonological awareness in preschool: a behavior-genetic study. J Learn Disabil. 2011 Jul-Aug; 44(4):322-9. PMID: 21571699; PMCID: PMC3158276.
    46. 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; PMCID: PMC3085049.
    47. 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; PMCID: PMC3674022.
    48. 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.
      View in: PubMed
    49. Betjemann RS, Keenan JM, Olson RK, Defries JC. Choice of Reading Comprehension Test Influences the Outcomes of Genetic Analyses. Sci Stud Read. 2011 Jan 01; 15(4):363-382. PMID: 21804757.
      View in: PubMed
    50. 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; PMCID: PMC3079018.
    51. Scerri TS, Paracchini S, Morris A, MacPhie IL, Talcott J, Stein J, Smith SD, Pennington BF, Olson RK, DeFries JC, Monaco AP, Richardson AJ. Identification of candidate genes for dyslexia susceptibility on chromosome 18. PLoS One. 2010 Oct 28; 5(10):e13712. PMID: 21060895; PMCID: PMC2965662.
    52. 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; PMCID: PMC2943674.
    53. 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; PMCID: PMC2953861.
    54. 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; PMCID: PMC2993430.
    55. 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.
      View in: PubMed
    56. 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.
      View in: PubMed
    57. Friend A, Olson RK. Phonological Spelling and Reading Deficits in Children with Spelling Disabilities. Sci Stud Read. 2010 Jan; 12(1):90-105. PMID: 20585591.
      View in: PubMed
    58. Coventry WL, Byrne B, Coleman M, Olson RK, Corley R, Willcutt E, Samuelsson S. Does classroom separation affect twins' reading ability in the early years of school? Twin Res Hum Genet. 2009 Oct; 12(5):455-61. PMID: 19803773; PMCID: PMC3915871.
    59. Hawke JL, Olson RK, Willcut EG, Wadsworth SJ, DeFries JC. Gender ratios for reading difficulties. Dyslexia. 2009 Aug; 15(3):239-42. PMID: 19367616; PMCID: PMC2739722.
    60. 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.
      View in: PubMed
    61. 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; PMCID: PMC3387983.
    62. 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; PMCID: PMC2743891.
    63. Friend A, DeFries JC, Olson RK. Parental education moderates genetic influences on reading disability. Psychol Sci. 2008 Nov; 19(11):1124-30. PMID: 19076484; PMCID: PMC2605635.
    64. 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.
      View in: PubMed
    65. 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.
      View in: PubMed
    66. 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.
      View in: PubMed
    67. Phinney E, Pennington BF, Olson R, Filley CM, Filipek PA. Brain structure correlates of component reading processes: implications for reading disability. Cortex. 2007 Aug; 43(6):777-91. PMID: 17710829.
      View in: PubMed
    68. Friend A, DeFries JC, Wadsworth SJ, Olson RK. Genetic and environmental influences on word recognition and spelling deficits as a function of age. Behav Genet. 2007 May; 37(3):477-86. PMID: 17345157.
      View in: PubMed
    69. Olson RK. Genes, environment, and dyslexia. The 2005 Norman Geschwind Memorial Lecture. Ann Dyslexia. 2006 Dec; 56(2):205-38. PMID: 17849199.
      View in: PubMed
    70. 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.
      View in: PubMed
    71. Meng H, Smith SD, Hager K, Held M, Liu J, Olson RK, Pennington BF, DeFries JC, Gelernter J, O'Reilly-Pol T, Somlo S, Skudlarski P, Shaywitz SE, Shaywitz BA, Marchione K, Wang Y, Paramasivam M, LoTurco JJ, Page GP, Gruen JR. DCDC2 is associated with reading disability and modulates neuronal development in the brain. Proc Natl Acad Sci U S A. 2005 Nov 22; 102(47):17053-8. PMID: 16278297; PMCID: PMC1278934.
    72. Meng H, Hager K, Held M, Page GP, Olson RK, Pennington BF, DeFries JC, Smith SD, Gruen JR. TDT-association analysis of EKN1 and dyslexia in a Colorado twin cohort. Hum Genet. 2005 Oct; 118(1):87-90. PMID: 16133186.
      View in: PubMed
    73. 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.
      View in: PubMed
    74. Francks C, Paracchini S, Smith SD, Richardson AJ, Scerri TS, Cardon LR, Marlow AJ, MacPhie IL, Walter J, Pennington BF, Fisher SE, Olson RK, DeFries JC, Stein JF, Monaco AP. A 77-kilobase region of chromosome 6p22.2 is associated with dyslexia in families from the United Kingdom and from the United States. Am J Hum Genet. 2004 Dec; 75(6):1046-58. PMID: 15514892; PMCID: PMC1182140.
    75. 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.
      View in: PubMed
    76. Tiu RD, Wadsworth SJ, Olson RK, DeFries JC. Causal models of reading disability: a twin study. Twin Res. 2004 Jun; 7(3):275-83. PMID: 15193172.
      View in: PubMed
    77. Deffenbacher KE, Kenyon JB, Hoover DM, Olson RK, Pennington BF, DeFries JC, Smith SD. Refinement of the 6p21.3 quantitative trait locus influencing dyslexia: linkage and association analyses. Hum Genet. 2004 Jul; 115(2):128-38. PMID: 15138886.
      View in: PubMed
    78. Gayán J, Olson RK. Genetic and environmental influences on individual differences in printed word recognition. J Exp Child Psychol. 2003 Feb; 84(2):97-123. PMID: 12609495.
      View in: PubMed
    79. Olson RK. Dyslexia: nature and nurture. Dyslexia. 2002 Jul-Sep; 8(3):143-59. PMID: 12222731.
      View in: PubMed
    80. Knopik VS, Smith SD, Cardon L, Pennington B, Gayan J, Olson RK, DeFries JC. Differential genetic etiology of reading component processes as a function of IQ. Behav Genet. 2002 May; 32(3):181-98. PMID: 12141780.
      View in: PubMed
    81. Willcutt EG, Pennington BF, Smith SD, Cardon LR, Gayán 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.
      View in: PubMed
    82. Francks C, Fisher SE, Olson RK, Pennington BF, Smith SD, DeFries JC, Monaco AP. Fine mapping of the chromosome 2p12-16 dyslexia susceptibility locus: quantitative association analysis and positional candidate genes SEMA4F and OTX1. Psychiatr Genet. 2002 Mar; 12(1):35-41. PMID: 11901358.
      View in: PubMed
    83. Fisher SE, Francks C, Marlow AJ, MacPhie IL, Newbury DF, Cardon LR, Ishikawa-Brush Y, Richardson AJ, Talcott JB, Gayán J, Olson RK, Pennington BF, Smith SD, DeFries JC, Stein JF, Monaco AP. Independent genome-wide scans identify a chromosome 18 quantitative-trait locus influencing dyslexia. Nat Genet. 2002 Jan; 30(1):86-91. PMID: 11743577.
      View in: PubMed
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