Important Announcement: Online Submission and Refereeing System Is Launched Announcement Pages: 1 - 1
Mapping Multiple Quantitative Trait Loci for Ordinal Traits Nengjun YiShizhong XuDavid B. Allison OriginalPaper Pages: 3 - 15
Using the Mplus Computer Program to Estimate Models for Continuous and Categorical Data from Twins Carol A. Prescott OriginalPaper Pages: 17 - 40
A Genetic Investigation of the Covariation Among Inspection Time, Choice Reaction Time, and IQ Subtest Scores Michelle LucianoMargaret J. WrightNicholas G. Martin OriginalPaper Pages: 41 - 50
Familial Aggregation Patterns in Mathematical Ability Ellen M. WijsmanNancy M. RobinsonWendy H. Raskind OriginalPaper Pages: 51 - 62
A Twin Study of Competence and Behavioral/Emotional Problems Among Adolescents in Taiwan Po-Hsiu KuoChaucer C. H. LinWei J. Chen OriginalPaper Pages: 63 - 74
Are Personality Disorders Psychological Manifestations of Executive Function Deficits? Bivariate Heritability Evidence from a Twin Study Frederick L. CoolidgeLinda L. ThedeKerry L. Jang OriginalPaper Pages: 75 - 84
Association Between Dependent Smoking and a Polymorphism in the Tyrosine Hydroxylase Gene in a Prospective Population-Based Study of Adolescent Health Craig OlssonRichard AnneyRobert Williamson OriginalPaper Pages: 85 - 91
Identification of Quantitative Trait Loci for Anxiety and Locomotion Phenotypes in Rat Recombinant Inbred Strains Lisa H. ContiMartin JiroutMorton P. Printz OriginalPaper Pages: 93 - 103
Operant Conditioning in the Ts65Dn Mouse: Learning Galen R. WengerCecilia SchmidtMuriel T. Davisson OriginalPaper Pages: 105 - 119
Major Growth QTLs in Fowl Are Related to Fearful Behavior: Possible Genetic Links Between Fear Responses and Production Traits in a Red Junglefowl × White Leghorn Intercross Karin E. SchützSusanne KerjePer Jensen OriginalPaper Pages: 121 - 130
Number of Arginine-Vasopressin Neurons in the Suprachiasmatic Nuclei Is Not Related to Level or Circadian Characteristics of Wheel-Running Activity in House Mice Kelly J. HochstetlerTheodore Garland Jr.Abel Bult-Ito OriginalPaper Pages: 131 - 136