John Hewitt

2009

Brant, A.M., Haberstick, B.C., Corley, R.P., Wadsworth, S.J., DeFries, J.C., & Hewitt, J.K. (2009). The Developmental Etiology of High IQ. Behavior Genetics, 39(4), 393-405. . PMID: 19377873

Button, T.M.M., Stallings, M.C., Rhee, S.H., Corley, R.P., Boardman, J.D., & Hewitt, J.K. (2009). Perceived peer delinquency and the genetic predisposition for substance dependence vulnerability. Drug and Alcohol Dependence, 100(1-2):1-8. PMID: 19008053

Friedman NP, Corley RP, Hewitt JK, Wright KP Jr. (2009).Individual differences in childhood sleep problems predict later cognitive executive control. Sleep. 2009 Mar 1;32(3):323-33. PMID: 19294952

Gelhorn, H., Sakai, J., Mikulich-Gilbertson, S., Stallings, M., Young, S., Rhee, S.H., Hopfer, C., Hewitt, J., Crowley, T. (2009). An item response theory analysis of DSM-IV conduct disorder. Journal of the American Academy of Child and Adolescent Psychiatry. 2009 Jan;48(1):42-50. PMID: 19034046

Hartman, C.A., Hopfer, C.J., Haberstick, B., Rhee, S.H., Crowley, T.J., Corley, R.P., Hewitt, J.K., Ehringer, M.A. (2009). The association between cannabinoid receptor 1 gene (CNR1) and cannabis dependence symptoms in adolescents and young adults. Drug Alcohol Dependence, Sept 1, 104 (1-2), 11-6. PMID: 19443135

Haworth, C.M.A., Wright, M.J., Luciano, M., Martin, N.G., de Geus, E.J.C., van Beijsterveldt, C.E.M., Bartels, M., Posthuma, D., Boomsma, D.I., Davis, O.S.P., Kovas, Y., Corley, R.P., DeFries, J.C., Hewitt, J.K., Olson, R.K., Rhea, S.-A., Wadsworth, S.J., Iacono, W.G., McGue, M., Thompson, L.A., Hart, S.A., Petrill, S.A., & Lubinski, D., & Plomin, R. (2009). The heritability of general cognitive ability increases linearly from childhood to young adulthood. Molecular Psychiatry, June 2, 1-9. PMID: 19488046

Haworth, C.M.A., Wright, M.J., Martin, N.W., Martin, N.G., Boomsma, D.I., Bartels, M, Posthuma D., Davis, O.S.P., Brant, A.M., Corley, R.P., Hewitt, J.K., Iacono, W.G., McGue, M., Thompson, L.A., Hart, S.A., Petrill, S.A., Lubinski, D., Plomin, R. (2009). A twin study of the genetics of high cognitive ability selected from 11,000 twin pairs in six studies from four countries. Behavior Genetics, 39(4), 359-370. PMID: 19381794

Palmer RH, Young SE, Hopfer CJ, Corley RP, Stallings MC, Crowley TJ, Hewitt JK. (2009). Developmental epidemiology of drug use and abuse in adolescence and young adulthood: Evidence of generalized risk. Drug Alcohol Depend. 2009 Jun 1;102(1-3):78-87. PMID: 19250776

Schulz-Heik, J.R., Rhee, S.H., Silvern, L.E., Haberstick, B.C., Hopfer, C., Lessem, J.M., & Hewitt, J.K. (2009). The association between conduct problems and maltreatment: Testing genetic and environmental mediation. Behavior Genetics, Dec 19. [Epub ahead of print] PMID: 20024671

Schulz-Heik, J.R., Rhee, S.H., Silvern, L.E., Lessem, J.M., Haberstick B.C., Hopfer, C., & Hewitt, J.K. (2009). Investigation of genetically mediated child effects on maltreatment. Behavior Genetics, 39(3), 265-276. PMID: 19283463

Young, S.E., Friedman, N.P., Miyake, A., Willcutt, E.G., Corley, R.P., Haberstick, B.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(1), 117-130. PMID: 19222319

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2008

Boardman, J.D., Saint Onge, J.M., Haberstick, B.C., Timberlake, D.S., & Hewitt, J.K. (2008). Do schools moderate the genetic determinants of smoking? Behavior Genetics, 38, 234-246. | pubmed abstract |

Corley RP, Zeiger JS, Crowley T, Ehringer MA, Hewitt JK, Hopfer CJ, Lessem J, McQueen MB, Rhee SH, Smolen A, Stallings MC, Young SE, Krauter K. Association of candidate genes with antisocial drug dependence in adolescents. Drug Alcohol Depend. 2008 Mar 31; [Epub ahead of print] | pubmed abstract |

Faith, M.S., Rhea, S.A., Corley, R.P., & Hewitt, J.K. (2008). Genetic and shared environmental influences on children’s 24-h food and beverage intake: Sex differences at age 7 y1-3. American Journal of Clinical Nutrition, 87(4), 903-11 PMID: 18400713

Friedman, N.P., Miyake A., Young, S.E., DeFries J.C., Corley, R.P., & Hewitt, J.K. (2008). Individual differences in executive functions are almost entirely genetic in origin. Journal of Experimental Psychology and Genetics, 137(2), 201-225. PMID: 18473654

Gelhorn, H., Hartman, C., Sakai, J., Stallings, M., Young, S., Rhee, S., Corley, R., Hewitt, J., Hopfer, C., Crowley, T. (2008) Toward DSM-V: An Item Response Theory analysis of DSM-IV alcohol abuse and dependence criteria in adolescents. Journal of the American Academy of Child and Adolescent Psychiatry. 47(11):1329-39. PMID: 18827724

Haberstick,, B.C., Timberlake, D., Hopfer, C.J., Lessem, J.M., Ehringer, M.A., Hewitt, J.K. (2008). Genetic and environmental contributions to retrospectively reported DSM IV childhood attention deficit hyperactivity disorder. Psychological Medicine, 38(7), 1057-1066. PMID: 17892623

Hartman CA, Gelhorn H, Crowley TJ, Sakai JT, Stallings M, Young SE, Rhee SH, Corley R, Hewitt JK, Hopfer CJ (2008). Item response theory analysis of DSM-IV cannabis abuse and dependence criteria in adolescents. J Am Acad Child Adolesc Psychiatry, 47(2), 165-173. | pubmed abstract |

Schlaepfer, I.R., Hoft, N.R., Collins, A.C., Corley, R.P., Hewitt, J.K., Hopfer, C.J., Lessem, J.M., McQueen, M.B., Rhee, S.H., & Ehringer, M.A. (2008). The CHRNA5/A3/B4 gene cluster variability as an important determinant of early alcohol and tobacco initiation in young adults. Biological Psychiatry,1, 63(11), 1039-1046. PMID: 18163978

Schulz-Heik, R.J., Maentz, S.K., Rhee, S.H., Gelhorn, H.L., Young, S.E., Stallings, M.C., Timberlake, D., Smolen, A., Stetler, G.L., Sakai, J.T., Crowley, T.J. (2008). Case-control and within-family tests for an association between conduct disorder and DAT1. Psychiatric Genetics, 18, 17-24. PMID: 18197081

Subbarao, A., Rhee, S.H., Young, S.E., Ehringer, M.A., Corley, R.P., Hewitt, J.K. (2008). Common Genetic and Environmental Influences on Major Depressive Disorder and Conduct Disorder. J Abnorm Child Psychol., 36, 433 - 444. | pubmed abstract|

Zeiger, J.S., Haberstick, B.C., Schlaepfer, I., Collins, A.C., Corley, R.P., Crowley, T.J., Hewitt, J.K., Hopfer, C.J., Lessem, J., McQueen, M.B., Rhee, S.H., & Ehringer, M.A. (2008). The neuronal nicotinic receptor subunit genes (CHRNA6 and CHRNB3) are associated with subjective responses to tobacco. Human Molecular Genetics, 14(5), 724-734. | pubmed abstract |

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2007

Button, T.M., Corley, R.P., Rhee, S.H., Hewitt, J.K., Young, S.E., Stallings, M.C. (2007). Delinquent peer affiliation and conduct problems: A twin study. Journal of Abnormal Psychology, 16(3), 554-564. | pubmed abstract |

Button, T.M., Rhee, S.H., Hewitt, J.K., Young, S.E., Corley, R.P., Stallings, M.C. (2007). The role of conduct disorder in explaining the comorbidity between alcohol and illicit drug dependence in adolescence. Drug and Alcohol Dependence, 87(1), 46-53. | pubmed abstract |

Ehringer, M.A., Cleg, H.V., Collins, A.C., Corley, R.P., Crowley, T., Hewitt, J.K., Hopfer, C.J., Krauter, K., Lessem, J., Rhee, S.H., Schlaepfer, I., Smolen, A., Stallings, M.C., Young, S.E., Zeiger, J.S. (2007). Association of the neuronal nicotinic receptor beta2 subunit gene (CHRNB2) with subjective responses to alcohol and nicotine. American Journal of Medical Genetics, B Neuropsychiatric Genetics, 144B(5), 596-604. | pubmed abstract |

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(10), 893-900. | pubmed abstract |

Haberstick, B.C., Timberlake, D., Ehringer, M.A., Lessem, J.M., Hopfer, C.J., Smolen, A., Hewitt, J.K. (2007). Genes, time to first cigarette and nicotine dependence in a general population sample of young adults. Addiction. 102(4), 655-665. | pubmed abstract |

Haberstick, B.C., Timberlake, D., Hopfer, C.J., Lessem, J.M., Ehringer, M.A., Hewitt, J.K. (2007). Genetic and environmental contributions to retrospectively reported DSM-IV childhood attention deficit hyperactivity disorder. Psychological Medicine 25,1-10. | pubmed abstract |

Haberstick, B.C., Timberlake, D., Smolen, A., Sakai, J.T., Hopfer, C.J., Corley, R.P., Young, S.E., Stallings, M.C., Huizinga, D., Menard, S., Hartman, C., Grotpeter, J., Hewitt, J.K. (2007). Between- and within-family association test of the dopamine receptor D2 TaqIA polymorphism and alcohol abuse and dependence in a general population sample of adults. Journal of Studies on Alcohol and Drugs, 68(3), 362-370. | pubmed abstract |

Hopfer, C.J., Lessem, J.M., Hartman, C.A., Stallings, M.C., Cherny, S.S., Corley, R.P., Hewitt, J.K., Krauter, K.S., Mikulich-Gilbertson, S.K., Rhee, S.H., Smolen, A., Young, S.E., Crowley, T.J. (2007). A genome-wide scan for loci influencing adolescent cannabis dependence symptoms: evidence for linkage on chromosomes 3 and 9. Drug and Alcohol Dependence, 89(1), 34-41. | pubmed abstract |

Rhee SH, Cosgrove VE, Schmitz S, Haberstick BC, Corley RC, Hewitt JK.(2007). Early childhood temperament and the covariation between internalizing and externalizing behavior in school-aged children. Twin Research and Human Genetics, 10(1), 33-44. | pubmed abstract |

Rhee, S.H., Neale, M.C., Corley, R.C., Hewitt, J.K. (2007). The inclusion of measured covariates in the Neale and Kendler model fitting approach. Behavior Genetics, 37(2), 423-32. | pubmed abstract |

Sakai, J.T., Hopfer, C.J., Hartman, C., Haberstick, B.C., Smolen, A., Corley, R.P., Stallings, M.C., Young, S.E., Timberlake, D., Hewitt, J.K., Crowley, T.J. (2007).Test of association between TaqIA A1 allele and alcohol use disorder phenotypes in a sample of adolescent patients with serious substance and behavioral problems. Drug and Alcohol Dependence, 88(2-3),130-7. | pubmed abstract |

Sakai, J.T., Lessem, J.M., Haberstick, B.C., Hopfer, C.J., Smolen, A., Ehringer, M.A., Timberlake, D., Hewitt, J.K. (2007). Case-control and within-family tests for association between 5HTTLPR and conduct problems in a longitudinal adolescent sample. Psychiatric Genetics, 17(4), 207-214. | pubmed abstract |

Schlaepfer, I.R., Clegg, H.V., Corley, R.P., Crowley, T.J., Hewitt, J.K., Hopfer, C.J., Krauter, K., Lessem, J., Rhee, S.H., Stallings, M.C., Wehner, J.M., Young, S.E., Ehringer, M.A. (2007). The human protein kinase C gamma gene (PRKCG) as a susceptibility locus for behavioral disinhibition. Addiction Biology 12(2), 200-209. | pubmed abstract |

Schlaepfer IR, Hoft NR, Collins AC, Corley RP, Hewitt JK, Hopfer CJ, Lessem JM, McQueen MB, Rhee SH, Ehringer MA. (2007) The CHRNA5/A3/B4 Gene Cluster Variability as an Important Determinant of Early Alcohol and Tobacco Initiation in Young Adults. Biol Psychiatry. 2007 Dec 26; [Epub ahead of print]

Timberlake, D.S., Haberstick, B.C., Hopfer, C.J., Bricker, J., Sakai, J.T., Lessem, J.M., Hewitt, J.K. (2007). Progression from marijuana use to daily smoking and nicotine dependence in a national sample of U.S. adolescents. Drug and Alcohol Dependence, 88(2-3), 272-281. | pubmed abstract |

Timberlake, D.S., Hopfer, C.J., Rhee, S.H., Friedman, N.P., Haberstick, B.C., Lessem, J.M., Hewitt, J.K. (2007). College attendance and its effect on drinking behaviors in a longitudinal study of adolescents. Alcoholism: Clinical and Experimental Research, 31(6), 1020-1030. | pubmed abstract |

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2006

Bricker, J.B., Stallings, M.C., Corley, R.P., Wadsworth, S.J., Bryan, A., Timberlake, D.S., Hewitt, J.K., Caspi, A., Hofer, S.M., Rhea, S.A., DeFries, J.C. (2006). Genetic and environmental influences on age at sexual initiation in this Colorado adoption project. Behavior Genetics, May 19; [Epub ahead of print] | Pubmed Abstract |

Button, T.M.M, Corley, R.P., Rhee, S.H., Stallings, M.C.,Young, S.E.,Hewitt, J.K. (2006). Examination of the causes of covariation between conduct disorder and vulnerability to drug dependence. Twin Research and Human Genetics, 9(1), 38-45. | Pubmed Abstract |

Ehringer, M.A., Rhee, S.H., Young, S., Corley, R., & Hewitt, J.K. (2006). Genetic and environmental contributions to common psychopathologies of childhood and adolescence: a study of twins and their siblings. Journal of Abnormal Child Psychology, 34(1), 1-17. | Pubmed Abstract |

Friedman, N.P., Miyake, A., Corley, R.P., Young, S.E., DeFries, J.C., & Hewitt, J.K. (2006). Not all executive functions are related to intelligence. Psychological Science, 17(2), 172-179. | Pubmed Abstract |

Gelhorn, H.L., Stallings, M.C., Young, S.E., Corley, R. P., Rhee, S. and Hewitt, J.K.(2006). Common and specific genetic influences on aggressive and non-aggressive conduct disorder domains. Journal of the American Academy of Child and Adolescent Psychiatry, 45(5), 570-577. | Pubmed Abstract |

Haberstick B.C, Schmitz S., Young S.E., Hewitt J.K. (2006). Genes and developmental stability of aggressive behavior problems at home and school in a community sample of twins aged 7-12. Behavior Genetics 36(6), 809-19.

Haberstick B.C., Smolen A., Hewitt J.K. (2006). Family-Based Association Test of the 5HTTLPR and Aggressive Behavior in a General Population Sample of Children. Biological Psychiatry, 59(9), 836-843. | Pubmed Abstract |

Hopfer, C.J., Young, S.E., Purcell, S., Crowley, T.J., Stallings, M.C., Corley, R.P., Rhee, S.H., Smolen, A., Krauter, K., Hewitt, J.K., Ehringer,M.A. (2006). Cannabis receptor haplotype associated with fewer cannabis dependence symptoms in adolescents. American Journal of Medical Genetics Neuropsychiatric Genetics, epub ahead of print. | Pubmed Abstract |

Huizinga, D., Haberstick, B.C., Smolen, A., Menard, S., Young, S.E., Corley, R.P., Stallings, M.C., Grotpeter, J., & Hewitt, J.K. (2006). Childhood maltreatment, subsequent antisocial behavior, and the role of monoamine oxidase A genotype. Biological Psychiatry, 60, 677-683.

Lessem J.M., Hopfer C.J., Haberstick B.C., Timberlake D.S., Ehringer M.A., Smolen A., Hewitt J.K., (2006). Relationship between adolescent marijuana use and young adult ilicit drug use. Behavior Genetics, 36(4), 498-506. | Pubmed Abstract |

Rhee S.H., Hewitt J.K., Young S.E., Corley R.P., Crowley T.J., Neale M.C., Stallings M.C. (2006). Comorbidity between alcohol dependence and illicit drug dependence in adolescents with antisocial behavior and matched controls. Drug and Alchohol Dependence, 84(1), 85-92. | Pubmed Abstract |

Timberlake D.S., Haberstick B.C., Lessem J.M., Smolen A., Ehringer M.A., Hewitt J.K. (2006). An association between the DAT1 polymorphism and smoking behavior in young adults from the National Longitudinal Study of Adolescent Health. Health Psychology, 25(2), 190-197. | Pubmed Abstract |

Timberlake, D.S., Rhee, S.H., Haberstick, B.C., Hopfer, C., Ehringer, M., Lessem, J.M., Smolen, A., and Hewitt, J.K. (2006). The moderating effects of religiosity on the genetic and environmental determinants of smoking initiation. Nicotine and Tobacco Research, 8(1), 123-133. | Pubmed Abstract |

Young, S.E., Smolen, A., Hewitt, J.K., Haberstick, B., Stallings, M.C., Corley, R.P., and Thomas J. Crowley (2006). Interaction between MAO-A genotype and maltreatment in the risk for Conduct Disorder: Failure to confirm in adolescent patients. American Journal of Psychiatry, 163(6), 1019-1025. | Pubmed Abstract |

Young, S.E., Rhee, S.H., Stallings, M.C.,Corley, R.P., Hewitt, J.K. (2006). Genetic and environmental vulnerabilities underlying adolescent substance use and problem use: general or specific? Behavior Genetics, 36(4), 603-615. | Pubmed Abstract |

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2005

Gelhorn, H.L., Stallings, M.C., Young, S.E., Corley, R.P., Rhee, S. and Hewitt, J.K. (2005). Genetic and environmental influences on conduct disorder: Symptom, domain and full-scale analyses. Journal of Child Psychology and Psychiatry, 46, 580-591. | Pubmed Abstract |

Haberstick, B.C., Lessem, J.M., Hopfer, C.J., Smolen, A., Ehringer, M.A., Timberlake, D. and Hewitt, J.K. (2005). Monoamine oxidase A (MAOA) and antisocial behaviors in the presence of childhood and adolescent maltreatment. American Journal of Medical Genetics Part B: Neuropsychiatric Genetics, 135(1), 59-64. | Pubmed Abstract |

Haberstick, B.C., Young, S.E., Schmitz, S., and Hewitt, J.K. (2005). Contributions of genes and environments to stability and change in externalizing and internalizing problems during elementary and middle school. Behavior Genetics, 31, 381-396. | Pubmed Abstract |

Hopfer, C.J., Timberlake, D., Haberstick., B., Lessem, J.M., Ehringer, M.A., Smolen, A., & J.K. Hewitt, J.K. (2005). Genetic influences on quantity of alcohol consumed by adolescents and young adults. Drug and Alcohol Dependence, 78, 187-193. | Pubmed Abstract |

Rhee, S.H., Hewitt, J.K., Corley, R.P., Willcutt, E.G., and Pennington, B.F. (2005). Testing hypotheses regarding the causes of comorbidity: Examining the underlying deficits of comorbid disorders. Journal of Abnormal Psychology, 114, 346-62. | Pubmed Abstract |

Stallings, M.C., Corley, R.P., Dennehey, B., Hewitt, J.K., Krauter, K.S., Lessem, J.M., Mikulich-Gilbertson, S.K., Rhee, S.H., Smolen, A., Young. S.E., Crowley, T.J. (2005). A genome-wide search for quantitative trait loci that influence antisocial drug dependence in adolescence. Archives of General Psychiatry, 62, 1043-1051. | Pubmed Abstract |

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2004

Heiman, N., Stallings, M.C., Young, S.E., Hewitt, J.K. (2004). Investigating the genetic and environmental structure of Cloninger’s personality. Twin Research, 7(5), 462-70. | Pubmed Abstract |

Petrill, S.A., Lipton, P.A., Hewitt, J.K., Plomin, R., Cherny, S.S., Corley, R., DeFries, J.C. (2004). Genetic and environmental contributions to general cognitive ability through the first 16 years of life. Developmental Psychology, 40(5), 805-12. | Pubmed Abstract |

Rhee, S.H., Hewitt, J.K., Lessem, J.M., Stallings, M.C., Corley, R.P., & Neale, M.C. (2004). The validity of the Neale and Kendler model-fitting approach in examining the etiology of comorbidity. Behavior Genetics, 34, 251-265. | Pubmed Abstract |

Siewert, E.A., Stallings, M.C., & Hewitt, J.K. (2004). Factor structure and concurrent validity of the Drug Use Screening Inventory in a community adolescent sample. Addictive Behaviors, 29, 627-638. | Pubmed Abstract |

Siewert, E.A., Stallings, M.C., & Hewitt, J.K. (2004). Genetic influences on vulnerability to and protective factors for adolescent drinking. Twin Research, 7(6), 617-25. | Pubmed Abstract |

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Adams, J.B., Heath, A.J., Young, S.E., Corley, R.P., Hewitt, J.K., & Stallings, M.C. (2003). Relationships between personality and preferred substance and motivations for use among adolescent substance abusers. American Journal of Drug and Alcohol Abuse, 29, 691-712.

Bishop, E.G., Cherny, S.S., Corley, R., DeFries, J.C., & Hewitt, J.K. (2003). Developmental genetic analysis of general cognitive ability from 1 to 12 years in a sample of adoptees, biological siblings, and twins. Intelligence, 31, 31-49.

Heiman, N., Stallings, M.C., Hofer, S.M., & Hewitt, J.K. (2003). Investigating age differences in the genetic and environmental structure of the Tridimensional Personality Questionnaire in later adulthood. Behavior Genetics, 33(2), 171-180.

Hopfer, C.J., Crowley, T.J., & Hewitt, J.K. (2003). Review of twin and adoption studies of adolescent substance use. Journal of the American Academy of Child and Adolescent Psychiatry, 42, 710-719.

Hopfer, C.J., Stallings, M.C., Hewitt, J.K., Crowley, T.J. (2003). Family transmission of marijuana use, abuse, and dependence. Journal of the American Academy of Child and Adolescent Psychiatry, 42, 834-841.

Rhee, S.H., Hewitt, J.K., Corley, R.P., & Stallings, M.C. (2003). The validity of testing the etiology of comorbidity between two disorders: A review of family studies. Journal of Child Psychology and Psychiatry, 44, 612-636.

Rhee, S.H., Hewitt, J.K., Corley, R.P., & Stallings, M.C. (2003). The validity of testing the etiology of comorbidity between two disorders: Comparisons of disorder prevalences in families. Behavior Genetics, 33, 257-269.

Rhee, S.H., Hewitt, J.K., Young, S.E., Corley, R.P., Crowley, T.J., Stallings, M.C. (2003). Genetic and environmental influences on substance initiation, use, and problem use in adolescents. Archives of General Psychiatry, 60, 1256-1264.

Siewert, E.A., Stallings, M.C., & Hewitt, J.K. (2003). Genetic and environmental analysis of behavioral risk factors for adolescent drug use in a community twin sample. Twin Research, 6, 490-496.

Stallings, M.C., Corley, R.P., Hewitt, J.K., Krauter, K.S., Lessem, J.M., Mikulich, S.K., Rhee, S.H., Smolen, A., Young, S.E., & Crowley, T.J. (2003). A genome-wide search for quantitative trait loci influencing substance dependence vulnerability in adolescence. Drug and Alcohol Dependence, 70, 295-307.

Wamboldt, M.Z., Laudenslager, M., Wamboldt, F.S., Kelsay, K., Hewitt, J.K. (2003). Adolescents with atopic disorders have attenuated cortisol response to laboratory stress. The Journal of Allergy and Clinical Immunology, 111, 509-514.

Young, S.E., Smolen, A., Stallings, M.C., Corley, R.P., & Hewitt, J.K. (2003). Sibling-based association analyses of the serotonin transporter polymorphism and internalizing behavior problems in children. Journal of Child Psychology and Psychiatry, 44, 961-967.

Wadsworth, S.J., Corley, R.P., Hewitt, J.K., Plomin, R., & DeFries, J.C. (2002). Parent-offspring resemblance for reading performance at 7, 12 and 16 years of age in the Colorado Adoption Project. Journal of Child Psychology and Psychiatry 43, 769-774.

Young, S.E., Corley, R.P., Stallings, M.C., Rhee, S.H., Crowley, T.J., & Hewitt, J.K. (2002). Substance use, abuse and dependence in adolescence: Prevalence, symptom profiles, and correlates. Drug and Alcohol Dependence, 68, 309-322.

Young, S.E., Smolen, A., Corley, R.P., Krauter, K.S., DeFries, J.C., Crowley, T.J., & Hewitt, J.K. (2002). Dopamine transporter polymorphism associated with externalizing behavior problems in children. American Journal of Medical Genetics (Neuropsychiatric Genetics), 114, 144-149.

Foley, D.L., Pickles, A., Simonoff, E., Maes, H.H., Silberg, J.L., Hewitt, J.K., & Eaves, L.J. (2001). Parental concordance and comorbidity for psychiatric disorder and associated risks for current psychiatric symptoms and disorders in a community sample of juvenile twins. Journal of Child Psychology and Psychiatry, 42, 381-394.

Hopfer, C.J., Stallings, M.C., Hewitt, J.K., (2001). Common genetic and environmental vulnerability for alcohol and tobacco use in a volunteer sample of older female twins. Journal of Studies on Alcohol, 62, 717-723.

O’Connor, T.G., Jenkins, J.M., Hewitt, J.K., DeFries, J.C., & Plomin, R. (2001). Longitudinal connections between parenting and peer relationships in adoptive and biological families. Marriage and Family Review, 33, 251-271.

Purcell, S., Cherny, S.S., Hewitt, J.K., & Sham, P.C. (2001). Optimal sibship selection for genotyping in QTL linkage analysis. Human Heredity, 52, 1-13.

Rijsdijk, F.V., Hewitt, J.K., Sham, P.C. (2001). Analytic power calculation for QTL analysis of general pedigrees. European Journal of Human Genetics, 9, 335-340.

Wadsworth, S.J., Corley, R.P., Hewitt, J.K., & DeFries, J.C. (2001). Stability of genetic and environmental influences on reading performance at 7, 12 and 16 years of age in the Colorado Adoption Project. Behavior Genetics, 31, 353-359.

Meyer, J.M., Rutter, M., Silberg, J.L., Maes, H.H., Simonoff, E., Shillady, L.L., Pickles, A., Hewitt, J.K., & Eaves, L.J. (2000). Familial aggregation for conduct disorder symptomatology: The role of genes, marital discord, and family adaptability. Psychological Medicine, 30, 759-774.

Sham, P.C., Cherny, S.S., Purcell, S., & Hewitt, J.K. (2000). Power of linkage versus association analysis of quantitative traits, by use of variance-components models, for sibship data. American Journal of Human Genetics, 66, 1616-1630.

Sham, P.C., Zhao, J.H., Cherny, S.S., & Hewitt, J.K. (2000). Variance-components QTL linkage analysis of selected and non-normal sample conditioning on trait values. Genetic Epidemiology, 19(S1), S22-S28.

Van Hulle, C., Corley, R., Zahn-Waxler, C., Kagan, J., and Hewitt, J.K. (2000). An exploration of the genetic and environmental etiology of heart rate in infancy and middle childhood. Twin Research, 3, 259-265.

VanHulle, C., Corley, R., Zahn-Waxler, C., Kagan, J., & Hewitt, J.K. (2000). Early childhood heart rate does not predict externalizing behavior problems at age seven years. Journal of the American Academy of Child and Adolescent Psychiatry, 39, 1238-1244.

Wamboldt, M.Z., Bihun, J.T., Szefler, S., & Hewitt, J.K. (2000). Perception of induced bronchoconstriction in a community sample of adolescents. Journal of Allergy and Clinical Immunology, 106, 1102-1107.

Wamboldt, M.Z., Hewitt, J.K., Schmitz, S., Wamboldt, F.S., Räsänen, M., Koskenvuo, M., Romanov, K., Varjonen, J., & Kaprio, J. (2000).Familial association between allergic disorders and depression in adult Finnish twins. American Journal of Medical Genetics (Neuropsychiatric Genetics) 96, 146-153.

Young, S.E., Stallings, M.C., Corley, R.P., Krauter, K.S., Hewitt, J.K. (2000). Genetic and environmental influences on behavioral disinhibition. American Journal of Medical Genetics (Neuropsychiatric Genetics), 96, 684-695.

Fulker, D.W., Cherny, S.S., Sham, P.C., & Hewitt, J.K. (1999). Combined linkage and association sib-pair analysis for quantitative traits. American Journal for Human Genetics, 64, 259-267.

Gynther, L., Hewitt, J.K., Heath, A.C., & Eaves, L.J. (1999). Phenotypic and genetic factors in motives for smoking. Behavior Genetics, 29, 291-302.

Maes, H.H., Woodard, C.E., Murelle, L., Meyer, J.M., Silberg, J.L., Hewitt, J.K., Rutter, M., Simonoff, E., Pickles, A., Carbonneau, R., Neale, M.C., & Eaves, L.J. (1999). Tobacco, alcohol, and drug use in 8-16 year old twins: The Virginia Twin Study of Adolescent Behavioral Development. Journal of Studies on Alcohol, 60, 293-305.

Silberg, J., Pickles, A., Rutter, M., Hewitt, J., Simonoff, J., Maes, H., Carbonneau, R., Murrelle, L., Foley, D., & Eaves, L.J. (1999). The influence of genetic factors and life stress on depression among adolescent girls. Archives of General Psychiatry, 56, 225-232.

Stallings, M.C., Hewitt, J.K., Beresford, T., Heath, A.C., Eaves, L.J. (1999). A twin study of drinking and smoking onset and latencies from first use to regular use. Behavior Genetics, 29, 409-421.

Topolski, T.D., Hewitt, J.K., Eaves, L.J., Meyer, J.M., Silberg, J.L., Simonoff, E.S., & Rutter, M. (1999). Genetic and environmental influences on ratings of manifest anxiety by parents and children. Journal of Anxiety Disorders, 13(4), 371-397.

Eaves, L.J., Heath, A.C., Neale, M.C., Hewitt, J.K., Martin, N.G. (1998). Sex differences and non-additivity in the effects of genes on personality. Twin Research, 1, 131-137.

Maes, H.H., Neale, M.C., Kendler, K.S., Hewitt, J.K., Silberg, J.L., Foley, D.L., Meyer, J.M., Rutter, M.L., Simonoff, E., Pickles, A., & Eaves, L.J. (1998). Assortative mating for major psychiatric diagnoses in two population-based samples. Psychological Medicine, 28: 1389-1401.

Miles, D.R., Stallings, M.C., Young, S.E., Hewitt, J.K., Crowley, T.J., & Fulker, D.W. (1998). A family history and direct interview study of the familial aggregation of substance abuse: The adolescent substance abuse study. Drug and Alcohol Dependence, 49, 105-114.

Nance, W.E., Bodurtha, J., Eaves, L.J., Hewitt, J., Maes, H., Segrest, J., Meyer, J., Neale, M., & Schieken, R. (1998). Models for the longitudinal genetic analysis of same aged twins: Application to HDL cholesterol. Journal of Twin Research, 1, 3-8.

Petrill, S.A., Saudino, K.J., Cherny, S.S., Emde, R.N., Fulker, D.W., Hewitt, J.K., Plomin, R. (1998). Exploring the genetic etiology of high general cognitive ability in 14 to 36 month-old twins. Child Development, 69, 68-74.

Eaves, L.J., Silberg, J.L., Meyer, J.M., Maes, H.H., Simonoff, E., Pickles, A., Rutter, M., Neale, M.C., Reynolds, C.A., Erikson, M.T., Heath, A.C., Loeber, R., Truett, K.R., & Hewitt, J.K. (1997). Genetics and developmental psychopathology: 2. The main effects of genes and environment on behavioral problems in the Virginia Twin Study of Adolescent Behavioral Development. Journal of Child Psychology and Psychiatry, 38(8), 965-980.

Hahn, M.E., Hewitt, J.K., Schanz, N., Weinreb, L., & Henry, A. (1997). Genetic and developmental influences on infant mouse ultrasonic calling: I. A diallel analysis of the calls of 3-day olds. Behavior Genetics, 27, 133-144.

Hewitt, J.K. (1997). Behavior genetics and eating disorders. Psychopharmacology Bulletin, 33, 355-358.

Hewitt, J.K. (1997). The genetics of obesity: What have genetic studies told us about the environment? Behavior Genetics, 27, 353-358.

Hewitt, J.K., Silberg, J.L., Rutter, M., Simonoff, E., Meyer, J.M., Maes, H.H., Pickles, A., Neale, M.C., Loeber, R., Erickson, M.T., Kendler, K.S., Heath, A.C., Truett, K.R., Reynolds, C.A., & Eaves, L.J. (1997). Genetics and developmental psychopathology: 1. Phenotypic assessment in the Virginia Twin Study of Adolescent Behavioral Development. Journal of Child Psychology and Psychiatry, 38(8):943-963.

Petrill, S.A., Saudino, K.J., Cherny, S.S., Emde, R.N., Hewitt, J.K., Fulker, D.W., Plomin, R. (1997). Exploring the genetic etiology of low general cognitive ability from 14 to 36 months. Developmental Psychology, 33, 544-548.

Simonoff, E., Pickles, A., Meyer, J.M., Silberg, J.L., Maes, H.H., Loeber, R., Rutter, M., Hewitt, J.K., & Eaves, L.J. (1997). Epidemiology in the Virginia Twin Study of Adolescent Behavioral Development: Influences of age, gender and impairment on rates of disorder. Archives of General Psychiatry, 54(9):801-808.

Stallings, M.C., Cherny, S.S., Young, S.E., Miles, D.R., Hewitt, J.K., & Fulker, D.W. (1997). The familial aggregation of depressive symptoms, antisocial behavior, and alcohol abuse. American Journal of Medical Genetics, (Neuropsychiatric Genetics), 74, 183-191.

Topolski, T.D., Hewitt, J.K., Eaves, L.J., Silberg, J.L., Meyer, J.M., Rutter, M., Pickles, A., & Simonoff, E. (1997). Genetic and environmental influences on child reports of Manifest Anxiety and symptoms of Separation Anxiety and Overanxious disorders: A community-based twin study. Behavior Genetics, 27, 15-28.

Meyer, J.M., Silberg, J.L., Simonoff, E.S., Kendler, K.S., & Hewitt, J.K. (1996). The Virginia Twin Study of Adolescent Behavioral Development: Assessing sample biases in demographic correlates of psychopathology. Psychological Medicine, 26, 1119-1134.

Reynolds, C.A., Hewitt, J.K., Erickson, M., Silberg, J.L., Rutter, M., Simonoff, E., Meyer, J., & Eaves, L.J. (1996). The genetics of children's oral reading performance. Journal of Child Psychology and Psychiatry, 37, 425-434.

Silberg, J., Meyer, J., Rutter, M., Simonoff, E., Hewitt, J.K., Loeber, R., Pickles, A., Maes, H., & Eaves, L.J. (1996). Genetic and environmental influences on the covariation between hyperactivity and conduct disturbance in juvenile twins. Journal of Child Psychology and Psychiatry, 37, 803-816.

Stallings, M.C., Hewitt, J.K., Cloninger, C.R., Heath, A.C., & Eaves, L.J. (1996). Genetic and environmental structure of the Tridimensional Personality Questionnaire: Three or four primary temperament dimensions? Journal of Personality and Social Psychology, 70, 127-140.

Simonoff, E., Pickles, A., Hewitt, J.K., Silberg, J., Rutter, M., Loeber, R., Meyer, J., Neale, M., & Eaves, L.J. (1995). Multiple raters of disruptive child behavior: Using a genetic strategy to examine shared views and bias. Behavior Genetics, 25, 311-326.

Neale, M.C., Eaves, L.J., Hewitt, J.K., & Kendler, K.S. (1994). Multiple regression with data collected from relatives. Multivariate Behavioral Research, 29, 33-61.

Pickles, A., Crouchley, R., Simonoff, E., Eaves, L., Meyer, J., Rutter, M., Hewitt, J., & Silberg, J. (1994). Survival models for developmental genetic data: age of onset of puberty and antisocial behavior in twins. Genetic Epidemiology, 11, 155-170.

Pickles, A., Neale, M., Simonoff, E., Rutter, M., Hewitt, J.K., Meyer, J.M., Crouchley, R., Silberg, J.L., & Eaves, L.J. (1994). A simple method for censored age-of-onset data subject to recall bias: Mothers' reports of age of puberty in male twins. Behavior Genetics, 24, 457-468.

Prescott, C.A., Hewitt, J.K., Heath, A.C., Truett, K.R., Neale, M.C., & Eaves, L.J. (1994). Environmental and genetic influences on alcohol use in a volunteer sample of older twins. Journal of Studies on Alcohol, 55, 18-33.

Prescott, C.A., Hewitt, J.K., Truett, K., Heath, A.C., Neale, M.C., & Eaves, L.J. (1994). Genetic and environmental influences on lifetime alcohol-related problems in a volunteer sample of older twins. Journal of Studies on Alcohol, 55, 184-202.

Silberg, J.L., Erickson, M.T., Eaves, L.J., Rutter, M., & Hewitt, J.K. (1994). The application of structural modeling to maternal ratings of twins' behavioral and emotion problems. Journal Consulting and Clinical Psychology, 62, 510-521.

Truett, K.R., Eaves, L.J., Walters, E.E., Heath, A.C., Hewitt, J.K., Meyer, J.M., Silberg, J.L., Neale, M.C., Martin, N.G., & Kendler, K.S. (1994). A model system for analysis of the complexity of family resemblance in extended kinships of twins. Behavior Genetics 24, 35-50.

Eaves, L.J., Silberg, J.L., Hewitt, J.K., Rutter, M., Meyer, J.M., Neale, M.C., & Pickles, A. (1993). Analyzing twin resemblance in multi-symptom data: Genetic applications of a latent class model for symptoms of conduct disorders in juvenile boys. Behavior Genetics, 23, 5-20.

Heath, A.C., Gates, R., Martin, N.G., Meyer, J.M., Hewitt, J.K., Neale, M.C., & Eaves, L.J. (1993). Genetic contribution to risk of smoking initiation: comparisons across birth cohorts and across cultures. Journal of Substance Abuse, 5, 221-246.

Heath, A.C., Kessler, R.C., Neale, M.C., Hewitt, J.K., Eaves, L.J., & Kendler, K.S. (1993). Testing hypotheses about direction of causation using cross-sectional family data. Behavior Genetics, 23, 29-50.

Moskowitz, W.B., Mosteller, M., Hewitt, J.K., Eaves, L.J., Nance, W.E., & Schieken, R.M. (1993). Univariate genetic analysis of oxygen transport regulation in children: The Medical College of Virginia Twin Study. Pediatric Research, 33:6, 645-8.

Fabsitz, R., Carmelli, D., & Hewitt, J.K. (1992). Evidence of independent genetic effects on obesity in middle age. International Journal of Obesity, 16, 656-666.

Gau, J.S., J.L., Erickson, M.T., & Hewitt, J.K. (1992). Childhood behavior problems: A comparison of twin and non-twin samples. Acta Geneticae Medicae et Gemellologiae, 41, 53-63.

Hewitt, J.K. (1992). Localization of primary sites of genetic influence requires more information than two selected lines alone can yield (Critique of Sinclair's paper). Behavior Genetics, 22, 19-21.

Hewitt, J.K., Silberg, J.L., Neale, M.C., Eaves, L.J., & Erickson, M. (1992). The analysis of parental ratings of children's behavior using LISREL. Behavior Genetics, 22:3, 293-317.

Kendler, K.S., & Hewitt, J.K. (1992). The structure of self-report schizotypy in twins: I. An analysis of 10 self-report scales and neuroticism, extraversion and symptoms of anxiety and depression. Journal of Personality Disorders, 6:1, 1-17.

Schieken, R.M., Mosteller, M., Goble, M.M., Moskowitz, W.B., Hewitt, J.K., Eaves, L.J., & Nance, W.E. (1992). Multivariate genetic analysis of blood pressure and body size: The MCV Twin Study. Circulation, 86:6, 1780-1788.

Turner, J.R., & Hewitt, J.K. (1992). Twin studies of cardiovascular response to psychological challenge: A review and suggested future directions. Annals of Behavioral Medicine 14:1, 12-20.

Cooper, P., Benno, R., Hahn, M., & Hewitt, J.K. (1991). Genetic analysis of cerebellar foliation patterns in mice (Mus Musculus). Behavior Genetics, 21:4, 405-420.

Hewitt, J.K., Stunkard, A.J., Carroll, D., Sims, J., & Turner, J.R. (1991). A twin study approach towards understanding genetic contributions to body size and metabolic rate. Acta Geneticae Medicae et Gemellologiae, 40, 133-146.

Kendler, K.S., Ochs, A.L., Gorman, A.M., Hewitt, J.K., Ross, D.E., & Mirsky, A. (1991). The Structure of Schizotypy: A pilot multitrait twin study. Psychiatry Research, 36, 19-36.

Silberg, J.L., Meyer, J.M., Eaves, L.J., Neale, M.C., Hewitt, J.K., Heath, A.C., & Kendler, K.S. (1991). The effect of bias on the estimates of the genetic and environmental influences on ratings of depressive symptoms. International Journal of Methods in Psychiatric Research, 1, 59-67.

Sims, J., Boomsma, D.I., Carrol, D., Hewitt, J.K., & Turner, J.R. (1991). Genetics of Type A behavior in two European countries: evidence for sibling interaction. Behavior Genetics, 21:5, 513-528.

Verhaaren, H.A., Schieken, R.M., Mosteller, M., Hewitt, J.K., Eaves, L.J., & Nance, W.E. (1991). Bivariate genetic analysis of left ventricular mass and weight in pubertal twins. American Journal of Cardiology, 68, 661-668.

Bodurtha, J.N., Mosteller, M., Hewitt, J.K., Nance, W.E., Eaves, L.J., Moskowitz, W.B., Katz, S., & Schieken, R.M. (1990). Genetic analysis of Anthropometric Measures 11-year-old twins: the Medical College of Virginia Twin Study. Pediatric Research, 28:1, 1-4.

Eaves, L.J., Martin, N.G., Heath, A.C., Hewitt, J.K., & Neale, M.C. (1990). Personality and reproductive fitness. Behavior Genetics, 20:5, 563-568.

Moskowitz, W., Mosteller, M., Schieken, R., Bossano, R., Hewitt, J.K., Bodurtha, J.A., & Segrest, J.P., (1990). Lipoprotein and Oxygen Transport Alterations in Passive Smoking Preadolescent Children. The MCV twin study. Circulation, 81, 586-592.

Heath, A.C., Neale, M.C., Hewitt, J.K., Eaves, L.J. & Fulker, D.W. (1989). Testing structural equation models for twin data using LISREL. Behavior Genetics, 19:1, 9-35.

Hewitt, J.K. (1989). Of biases and more in the study of twins reared together: A Reply to Grayson. Behavior Genetics, 19:4, 605-608.

Hewitt, J.K., & Claridge, G. (1989). The factor structure of schizotypy in a normal population. Personality and Individual Differences, 10:3,323-329.

Neale, M.C., Eaves, L.J., Hewitt, J.K., Meyer, J.M., MacLean, C., & Kendler, K.S. (1989). Analyzing the relationship between age of onset and risk to relatives. American Journal of Human Genetics, 45, 226-239.

Neale, M.C., Eaves, L.J., Kendler, K.S., & Hewitt, J.K. (1989). Bias in correlations from selected samples of relatives: soft selection. Behavior Genetics, 19, 163-169.

Neale, M.C., Heath, A.C., Hewitt, J.K., & Eaves, L.J. (1989). Fitting genetic models with LISREL: hypothesis testing. Behavior Genetics, 19:1, 37-49.

Schieken, R.M., Eaves, L.J., Hewitt, J.K., Mosteller, M., Bodurtha, J., Moskowitz, W.B., & Nance, W. (1989). Univariate genetic analysis of blood pressure in children: The MCV twin study. American Journal of Cardiology, 64, 1333-1337.

Hewitt, J.K., Eaves, L.J., Neale, M., & Meyer, J. (1988). Resolving causes of developmental continuity or "tracking": I. Longitudinal twin studies during growth. Behavior Genetics, 18:2, 133-151.

Hewitt, J.K., & Heath, A.C. (1988). A note on computing the chi_square noncentrality parameter for power analyses. Behavior Genetics, 18:1, 105_108.

Sims, J., Carroll, D., Turner, J.R., & Hewitt, J.K. (1988). Cardiac and metabolic activity in mild hypertensive and normotensive subjects. Psychophysiology, 25:2, 172-178.

Claridge, G., & Hewitt, J.K. (1987). A biometrical study of schizotypy in a normal population. Personality and Individual Differences, 8:3, 303_312.

Hahn, M.E., Hewitt, J.K., Adams, M., & Tully, T. (1987). Genetic influences on ultrasonic vocalizations in young mice. Behavior Genetics, 17:2, 155_166.

Hewitt, J.K., Carroll, D., Sims, J., & Eaves, L.J. (1987). A developmental hypothesis for adult blood pressure. Acta Geneticae Medicae et Gemellologiae, 36, 475_483.

Hewitt, J.K., Hahn, M.E., & Karkowski, L. (1987). Genetic selection disrupts stability of mouse brain weight development. Developmental Brain Research, 417:2, 225_231.

Sims, J., Carroll, D., Hewitt, J.K., & Turner, J.R. (1987). A family study of developmental effects upon blood pressure variation. Acta Geneticae Medicae et Gemellologiae, 36, 467_473.

Turner, J.R., Sims, J., Carroll, D., Morgan, R.K., & Hewitt, J.K. (1987). A comparative evaluation of heart rate reactivity during MATH and a standard mental arithmetic task. International Journal of Psychophysiology, 5(4), 301.

Hallett, S., Quinn, D., & Hewitt, J.K. (1986). Defective interhemispheric integration and anomalous language lateralization in children at risk for schizophrenia. Journal of Nervous and Mental Diseases, 174, 418_427.

Sims, J., Hewitt, J.K., Kelly, K.A., Carroll, D., & Turner, J.R. (1986). Familial and individual influences on blood pressure. Acta Geneticae Medicae et Gemollologiae, 35, 7-21.

Turner, J.R., Carroll, D., Sims, J., Hewitt, J.K., & Kelly, K.A. (1986). Temporal and inter-task consistency of heart rate reactivity during active psychological challenge: a twin study. Physiology and Behavior, 38, 641-644.

Turner, J.R., Hewitt, J.K., Morgan, R.K., Sims, J., Carroll, D., & Kelly, K.A. (1986). Graded mental arithmetic as an active psychological challenge. International Journal of Psychophysiology, 3, 307-309.

Carroll, D., Hewitt, J.K., Last, K.A., Turner, J.R., & Sims, J. (1985). A twin study of cardiac reactivity and its relationship to parental blood pressure. Physiology and Behavior, 34 (1), 103_106.

Collins, M.F., & Hewitt, J.K. (1985). Courtship between and within inbred lines of Drosophila melanogaster. Animal Behavior, 33, (2), 682_683.

Collins, M.F., Hewitt, J.K., & Gogarty, J.F., (1985). Validating time-sampled observations of courtship in Drosophila melanogaster for behavior genetic analysis. Behavior Genetics, 15, 25-35.

Shephard, R.A., Hewitt, J.K., & Broadhurst, P.L. (1985). The inheritance of neophagia and behavioral diazepam sensitivity amongst the Roman strains of rat. Behavior Genetics, 15, 265-286.

Collins, M.F., & Hewitt, J.K. (1984). The genetic architecture of the male courtship sequence in Drosophila melanogaster. Heredity, 53, 321_337.

Hewitt, J.K. (1984). Normal components of personality variation. Journal of Personality and Social Psychology, 47, 671-675.

Hewitt, J.K., & Fulker, D.W. (1984). Genotypic differentiation of Roman selection lines did not disappear with inbreeding. Behavior Genetics, 14, 389-395.

Hewitt, J.K., & Fulker, D.W. (1984). Using the triple test cross to investigate the genetics of behavior in wild populations. III. Activity and reactivity. Behavior Genetics, 14, 125-135.

Hewitt, J.K., & Fulker, D.W. (1983). Using the triple test cross to investigate the genetics of behavior in wild populations. II. Escape-avoidance conditioning in Rattus norvegicus. Behavior Genetics, 13, 1-15.

Hewitt, J.K., Fulker, D.W. & Hewitt. C.A. (1983). Genetic architecture of olfactory discriminative avoidance conditioning in Drosophila melanogaster. Journal of Comparative Psychology, 97, 52-58.

Hewitt, J.K., & Fulker, D.W. (1981). Using the triple test cross to investigate the genetics of behavior in wild populations. I. Methodological considerations. Behavior Genetics, 11, 23-35.

Hewitt, J.K., Fulker, D.W., & Broadhurst, P.L. (1981). Genetics of escape-avoidance conditioning in laboratory and wild populations of rats: a biometrical approach. Behavior Genetics, 11, 533-544.

Hewitt, J.K. (1980). A note on the test for the direction of dominance in the triple test cross in the presence of genotype x environment interaction. Heredity, 45, 293-295.

Hewitt. J.K., Fulker, D.W., & Eysenck, H.J. (1978). Effect of strain and level of shock on the behavior of rats in PSI experiments. Psychological Reports, 42, 1103_1108.

Hewitt, J.K., Eysenck, H.J., & Eaves, L.J. (1977). Structure of social attitudes after twenty-five years: a replication. Psychological Reports, 40, 183_188.

Hewitt, J.K., Fulker, D.W., & DeFries, J.C. (1977). Open field behavior in mice: generality of results from a diallel analysis of replicate selected lines. Behavior Genetics, 7, 441-446.

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