Research Topics
| Erik G WillcuttSummaryAffiliation: University of Colorado Country: USA Publications
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Detail Information
Publications
Quantitative trait locus for reading disability on chromosome 6p is pleiotropic for attention-deficit/hyperactivity disorderErik G Willcutt
Institute for Behavioral Genetics, University of Colorado, Boulder, Colorado 80309, USA
Am J Med Genet 114:260-8. 2002....- Neuropsychological analyses of comorbidity between reading disability and attention deficit hyperactivity disorder: in search of the common deficitErik G Willcutt
Department of Psychology, University of Colorado at Boulder, CO 80309, USA
Dev Neuropsychol 27:35-78. 2005..Slow and variable processing speed was characteristic of all 3 clinical groups, suggesting that measures of this domain may be useful for future studies that search for the common genes that increase susceptibility to RD and ADHD... - Colorado longitudinal twin study of reading disabilitySally J Wadsworth
Institute for Behavioral Genetics, University of Colorado, 447 UCB, Boulder, CO 80309, USA
Ann Dyslexia 57:139-60. 2007..In addition, genetic correlations reached unity for both groups, suggesting that the same genetic influences are manifested at both time points... 
Behavioral disinhibition: liability for externalizing spectrum disorders and its genetic and environmental relation to response inhibition across adolescenceSusan E Young
Institute for Behavioral Genetics, University of Colorado at Boulder, Boulder, CO 80309, USA
J Abnorm Psychol 118:117-30. 2009..These results highlight the dynamic nature of behavioral disinhibition across adolescence and suggest that response inhibition may be an important mechanism underlying vulnerability to disinhibitory psychopathology...- Heritability of high reading ability and its interaction with parental educationAngela Friend
Department of Psychology, University of Colorado at Boulder, Boulder, CO 80309, USA
Behav Genet 39:427-36. 2009..This result provides a coherent account when considered alongside results of previous research showing that heritability for low reading ability decreased with lower levels of parental education... - Etiology and neuropsychology of comorbidity between RD and ADHD: the case for multiple-deficit modelsErik G Willcutt
Department of Psychology, University of Colorado, Boulder, CO 80309, USA
Cortex 46:1345-61. 2010..Attention-deficit/hyperactivity disorder (ADHD) and reading disability (RD) are complex childhood disorders that frequently co-occur, but the etiology of this comorbidity remains unknown... - Gene by environment interactions influencing reading disability and the inattentive symptom dimension of attention deficit/hyperactivity disorderJenni Rosenberg
Department of Psychology, University of Denver, Denver, CO 80208 0001, USA
J Child Psychol Psychiatry 53:243-51. 2012..However, previous research indicates that RD and ADHD enter into opposite gene by environment (G × E) interactions... - Test of alternative hypotheses explaining the comorbidity between attention-deficit/hyperactivity disorder and conduct disorderSoo Hyun Rhee
Department of Psychology, University of Colorado, Boulder, CO 80309, USA
J Abnorm Child Psychol 36:29-40. 2008..The results suggest that correlated risk factors are a better explanation for the comorbidity between ADHD and CD than a third, independent ADHD+CD subtype... - Symptom-correlated brain regions in young adults with combined-type ADHD: their organization, variability, and relation to behavioral performanceBrendan E Depue
Department of Psychology, University of Colorado at Boulder, Boulder, CO 80309, USA
Psychiatry Res 182:96-102. 2010..The results suggest that a diverse set of brain structures is linked to ADHD symptoms and that the variability of activation within these regions may contribute to compromised attentional control... - Understanding the complex etiologies of developmental disorders: behavioral and molecular genetic approachesErik G Willcutt
Department of Psychology and Neuroscience, University of Colorado at Boulder, Boulder, CO 80309, USA
J Dev Behav Pediatr 31:533-44. 2010..Implications of the results for these specific disorders and for developmental disabilities as a whole are discussed, and novel directions for future research are highlighted... - Colorado Learning Difficulties Questionnaire: validation of a parent-report screening measureErik G Willcutt
Department of Psychology and Neuroscience, UCB 345, University of Colorado, Boulder, CO 80309, USA
Psychol Assess 23:778-91. 2011..Results are also promising for the other 4 CLDQ scales, but additional research is needed to refine each of these measures... - Gene X environment interactions in reading disability and attention-deficit/hyperactivity disorderBruce F Pennington
Department of Psychology, University of Denver, USA
Dev Psychol 45:77-89. 2009..However, they did not find a G x E interaction at the favorable end of the ADHD symptom dimension. The authors conclude with implications for future research... - Greater attention problems during childhood predict poorer executive functioning in late adolescenceNaomi P Friedman
Institute for Behavioral Genetics, 447 UCB, University of Colorado, Boulder, CO 80309, USA
Psychol Sci 18:893-900. 2007..These results support the hypothesis that attention problems primarily reflect difficulties with response inhibition... - Attentional control activation relates to working memory in attention-deficit/hyperactivity disorderGregory C Burgess
Institute for Cognitive Science, University of Colorado at Boulder, Boulder, Colorado, USA
Biol Psychiatry 67:632-40. 2010..The current study examined whether WM ability might explain group differences in brain activation between adults with ADHD and normal control subjects during attentional demand... - Processing speed deficits in attention deficit/hyperactivity disorder and reading disabilityMichelle A Shanahan
Department of Psychology, University of Denver, Denver, Colorado, USA
J Abnorm Child Psychol 34:585-602. 2006.... - DeFries-Fulker analysis of longitudinal reading performance data from twin pairs ascertained for reading difficulties and from their nontwin siblingsRaven L Astrom
Institute for Behavioral Genetics, University of Colorado, 447 UCB, Boulder, CO 80309, USA
Behav Genet 41:660-7. 2011..However, tests for special twin environmental influences were nonsignificant... - Understanding comorbidity: a twin study of reading disability and attention-deficit/hyperactivity disorderErik G Willcutt
University of Colorado at Boulder, Boulder, Colorado 80309, USA
Am J Med Genet B Neuropsychiatr Genet 144:709-14. 2007.... - Testing for neuropsychological endophenotypes in siblings discordant for attention-deficit/hyperactivity disorderL Cinnamon Bidwell
Department of Psychology, University of Colorado, Boulder, Colorado, USA
Biol Psychiatry 62:991-8. 2007..Neurocognitive deficits associated with attention-deficit/hyperactivity disorder (ADHD) might be useful intermediate endophenotypes for determining specific genetic pathways that contribute to ADHD... 
The neural basis of sustained and transient attentional control in young adults with ADHDMarie T Banich
Institute of Cognitive Science, University of Colorado at Boulder, Boulder, CO 80309 0344, USA
Neuropsychologia 47:3095-104. 2009....- Validity of the executive function theory of attention-deficit/hyperactivity disorder: a meta-analytic reviewErik G Willcutt
Department of Psychology, University of Colorado, Boulder, Colorado 80309, USA
Biol Psychiatry 57:1336-46. 2005..Difficulties with EF appear to be one important component of the complex neuropsychology of ADHD... - Individual prediction of dyslexia by single versus multiple deficit modelsBruce F Pennington
Department of Psychology, University of Denver, Denver, CO 80208, USA
J Abnorm Psychol 121:212-24. 2012..We discuss the clinical implications of these results for both diagnosis of school-age children and preschool prediction of children at risk for dyslexia... - Genetic covariation between brain volumes and IQ, reading performance, and processing speedRebecca S Betjemann
Department of Psychology, D 12, Regis University, 3333 Regis Blvd, Denver, CO 80221, USA
Behav Genet 40:135-45. 2010..64), and white matter (r (g) = .89), but not prefrontal cortex. The only brain measure to share genetic influence with reading was total brain volume (r (g) = .32), which also shared genetic influences with processing speed... - Gene x Environment interactions in speech sound disorder predict language and preliteracy outcomesLauren M McGrath
University of Denver, Department of Psychology, Frontier Hall, 2155 S Race Street, Denver, CO 80209, USA
Dev Psychopathol 19:1047-72. 2007..The direction of these interactions and possible interpretations are explored in the discussion... - Behavioral performance predicts grey matter reductions in the right inferior frontal gyrus in young adults with combined type ADHDBrendan E Depue
Department of Psychology, University of Colorado at Boulder, Boulder, CO 80309, USA
Psychiatry Res 182:231-7. 2010..These morphometric differences are related to disruptions in performance on behavioral tasks that frequently have been reported to be affected in individuals with ADHD... - Multiple regression analysis of reading performance data from twin pairs with reading difficulties and nontwin siblings: the augmented modelSally J Wadsworth
Institute for Behavioral Genetics, University of Colorado, Boulder, CO 80309, USA
Twin Res Hum Genet 15:116-9. 2012..36) may be substantially greater than those for less contemporaneous twin-sibling pairs (.14)... - Etiology of the comorbidity between RD and ADHD: exploration of the non-random mating hypothesisMelanie C Friedman
Department of Psychology, University of Denver, Denver, Colorado 80208, USA
Am J Med Genet B Neuropsychiatr Genet 120:109-15. 2003..There was little evidence to support that non-random mating also contributes to this comorbidity in the present sample... - Causal heterogeneity in attention-deficit/hyperactivity disorder: do we need neuropsychologically impaired subtypes?Joel T Nigg
Department of Psychology, Michigan State University, East Lansing, Michigan 48824, USA
Biol Psychiatry 57:1224-30. 2005.... - Testing hypotheses regarding the causes of comorbidity: examining the underlying deficits of comorbid disordersSoo Hyun Rhee
Department of Psychology, University of Colorado, Boulder, CO 80309, USA
J Abnorm Psychol 114:346-62. 2005..The ability to distinguish the correct model decreased as the sample size and the correlation between the underlying deficits and the symptom scores decreased, suggesting that the issue of power should be considered carefully... - The relation between sluggish cognitive tempo and DSM-IV ADHDChristie A Hartman
Institute for Behavioral Genetics and Department of Psychology, University of Colorado at Boulder, Boulder, Colorado 80309 0447, USA
J Abnorm Child Psychol 32:491-503. 2004..These results suggest that SCT is an internally consistent construct that is significantly associated with DSM-IV inattention... - Modeling rater disagreement for ADHD: are parents or teachers biased?Christie A Hartman
Department of Psychiatry, University of Colorado at Denver and Health Sciences Center, 4200 East 9th Ave, Box C 268 35, Denver, CO 80262, USA
J Abnorm Child Psychol 35:536-42. 2007.... - Big five dimensions and ADHD symptoms: links between personality traits and clinical symptomsJoel T Nigg
Department of Psychology, Michigan State University, East Lansing 48824 1117, USA
J Pers Soc Psychol 83:451-69. 2002..Results were replicated with self-reports and observer reports of personality in community and clinical samples. Findings support theoretical connections between personality traits and ADHD symptoms... - Attention-deficit/hyperactivity disorder endophenotypesAlysa E Doyle
Department of Psychiatry, Harvard Medical School, Boston, Massachusetts, USA
Biol Psychiatry 57:1324-35. 2005..We conclude that these endophenotypes will not be a quick fix for the field but offer potential if careful consideration is given to issues of heterogeneity, measurement and statistical power... - Are endophenotypes based on measures of executive functions useful for molecular genetic studies of ADHD?Alysa E Doyle
Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
J Child Psychol Psychiatry 46:774-803. 2005..Thus far, potential endophenotypes for ADHD have not been systematically studied... - Three-year predictive validity of DSM-IV attention deficit hyperactivity disorder in children diagnosed at 4-6 years of ageBenjamin B Lahey
Department of Psychiatry MC 3077, University of Chicago, 5811 South Maryland Avenue, Chicago, IL 60637, USA
Am J Psychiatry 161:2014-20. 2004..Predictive validity is a fundamental consideration in evaluating the DSM-IV diagnostic criteria for attention deficit hyperactivity disorder (ADHD), particularly for younger children... - Sex differences in young children who meet criteria for attention deficit hyperactivity disorderCynthia M Hartung
Oklahoma State University, USA
J Clin Child Adolesc Psychol 31:453-64. 2002..Young girls and boys who meet DSM-IV criteria for ADHD are more similar than different, but boys tend to display more symptoms of ADHD, particularly in school... - Collaborative analysis of DRD4 and DAT genotypes in population-defined ADHD subtypesRichard D Todd
Department of Psychiatry, Washington University School of Medicine, St Louis, Missouri 63110, USA
J Child Psychol Psychiatry 46:1067-73. 2005..The goal of the current study is to test whether population-based ADHD subtypes defined by latent class analysis help resolve issues of variable findings across individual gene association studies...