1. A study of problem behaviors in 10- to 15-year-old biologically related and unrelated international adoptees

   • Edwin J. C. G. van den Oord
   • Dorret I. Boomsma
   • Frank C. Verhulst

   OriginalPaper Pages: 193 - 205

2. Variability and stability in cognitive abilities are largely genetic later in life

   • R. Plomin
   • N. L. Pedersen
   • G. E. McClearn

   OriginalPaper Pages: 207 - 215

3. An international study of human handedness: The data

   • Ira B. Perelle
   • Lee Ehrman

   OriginalPaper Pages: 217 - 227

4. Logistic regression analysis of twin data: Estimation of parameters of the multifactorial liability-threshold model

   • P. C. Sham
   • E. E. Walters
   • K. S. Kendler

   OriginalPaper Pages: 229 - 238

5. The power of the classical twin study to resolve variation in threshold traits

   • Michael C. Neale
   • Lindon J. Eaves
   • Kenneth S. Kendler

   OriginalPaper Pages: 239 - 258

6. A simple algebraic demonstration of the validity of DeFries-Fulker analysis in unselected samples with multiple kinship levels

   • Joseph Lee Rodgers
   • Matt McGue

   OriginalPaper Pages: 259 - 262

7. Songs produced by the females of theDrosophila virilis group of species

   • Päivi Satokangas
   • Jaana O. Liimatainen
   • Anneli Hoikkala

   OriginalPaper Pages: 263 - 272

8. Swimming navigation, open-field activity, and extrapolation behavior of two inbred mouse strains with Robertsonian translocation of chromosomes 8 and 17

   • Brigitte Leitinger
   • Inga I. Poletaeva
   • Hans-Peter Lipp

   OriginalPaper Pages: 273 - 284

9. Evidence for a multigenic system controlling methyl-β-carboline-3-carboxylate (β-CCM)-induced seizures

   • Benoît Martin
   • Catherine Marchaland
   • Roland Motta

   OriginalPaper Pages: 285 - 297

10. Genes and environment in personality development

    • Scott Hershberger

    Book Review Pages: 299 - 300