The Trouble with Twin Studies

Jay Joseph, PsyD., is a licensed psychologist practicing in the San Francisco Bay Area. Since 1998 he has published two books, several book chapters, and many articles in peer reviewed journals, where he has presented a critical appraisal of genetic theories and research in psychiatry and psychology.

Preface. Part I: Studies of Twins Reared-Apart 1. Introduction 2. Studies of Reared-Apart Twins: Origins, Publications, and Scandal 3. Studies of Reared-Apart Twins: The Critics Respond 4. Studies of Reared-Apart Twins: Basic Assumptions and Potential Fallacies 5. The Minnesota Study of Twins Reared-Apart I: Biases, Assumptions and Other Problem Areas 6. The Minnesota Study of Twins Reared-Apart II: IQ and Personality Studies Part II: Studies of Reared-Together Twins 7. The MZT-DZT Equal Environment Assumption: The Achilles Heel of the Classical Twin Method 8. Twin Research in Psychiatry Part III: Approaching a Post-Behavioral Genetics Era? 9. Molecular Genetic Research: The Ultimate Test of Genetic Interpretations of Twin Studies 10. The Crumbling Pillars of Behavioral Genetics 11. A Human Genetics Parable 12. Summary and Conclusions. Appendices. References.