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In this program, Dr. Mercy will discuss studies performed with identical and fraternal twins as participants. If you have been a participant in a twin study perhaps through one of the large registries that exist through the United States and the world, we would love to hear your experiences. Twin studies can be cross-sectional or longitudinal; they often focus on the interrelationship among genetics, shared environment, and non-shared environment in order to determine the relative effects on personality, aptitudes, life experiences, and health. Some studies have been done with MRI technology to measure the size of fetal brains. Dr. Mercy will cover these resources and will also discuss the recent findings that identical twin DNA is not necessarily identical; she welcomes callers to discuss the implications of such results for society and the twins themselves. She will also report on various twin registries across the world, their purposes, and some results of the longitudinal studies that these registries are used to conduct.
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Denise and Deanne live on opposite coasts, Denise in New York and Deanne in California. Has this geographic separation taken a toll on their twinship? One twin was extroverted and sought the companionship of her peers; the other was closer to the family and sought approval there. They were close in their younger years and supported each other in hard times. How did they find themselves so far apart in adulthood? What forces and factors shaped each twin? How are they alike and different? How do they communicate now in maturity? Do they still think of each other as identical twins and how do they express this bond? This twinship is a fascinating story of twins with primarily non-shared experiences. Their genes, aptitudes, intelligence, and interests are very similar, yet they have lived in two very different worlds both familiar to them from childhood. Hear them discuss the choices they have made as women and identical twins.
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Special guest Pamela Prindle Fierro is an author and mother of identical twins, Pamela sought to connect with fellow parents of twins for advice and companionship. She now writes and supports other families with multiples, to encourage them in their parenting journey. She's written and produced numerous Web features on parenting and home management. Pamela is the author of three books:
- Everything Twins, Triplets and More (2012)
- Your Pregnancy Devotional (2006)
- Mommy Rescue Guide Twins, Triplets, and More: Lifesaving Techniques and Advice for Surviving Life with Multiples (2008)
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Dr. Nancy Segal, Professor of Psychology and Director of Twin Studies at the California State University, Fullerton, will be discussing How Identical are Identical Twins. Dr. Segal has written seven books about twins. Dr. Segal has authored approximately 250 scientific articles and book chapters in addition to her many books. A recent paper won a 2007 Award for Excellence in Research from the Mensa Foundation. She is also an Associate Editor of Twin Research and Human Genetics, the official journal of the International Society for Twin Studies. She serves on the editorial boards of a number of journals, including Twin Research and Human Genetics, Evolution and Human Behavior and Human Ethology.