By Nancy L. Segal
The exact “Jim twins” have been raised in separate households and met for the 1st time at age thirty-nine, merely to find that they either suffered pressure complications, bit their fingernails, smoked Salems, loved woodworking, and vacationed at the similar Florida seashore. this instance of the capability strength of genetics captured common media realization in 1979 and encouraged the Minnesota research of Twins Reared aside. This landmark research into the nature-nurture debate shook the medical neighborhood through demonstrating, throughout a few qualities, that twins reared individually are as alike as these raised jointly.
As a postdoctoral fellow after which as assistant director of the Minnesota research, Nancy L. Segal offers an eagerly expected assessment of its medical contributions and their influence on public attention. The study’s proof of genetic effect on person adjustments in features reminiscent of character (50%) and intelligence (70%) overturned traditional principles approximately parenting and instructing. Treating young ones otherwise and nurturing their inherent skills unexpectedly a fairer strategy than treating all of them an identical. Findings of genetic impression on physiological features equivalent to cardiac and immunologic functionality have ended in extra special ways to ailment prevention and therapy. And symptoms of a much better genetic impact on male than lady homosexuality have furthered debate concerning sexual orientation.
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Extra info for Born Together - Reared Apart: The Landmark Minnesota Twin Study
44 B O R N TO G E T H E R — R E A R E D A PA RT most contact measures had little influence on the twins’ behavioral outcomes and some associations were in a counterintuitive direction. 16) between days before separation and feelings of familiarity at the time of assessment. This implied that the twins who were together longer felt less familiar with one another than those who were separated sooner! This counterintuitive association was possibly a chance finding. The MISTRA sample also included the twins’ spouses, children, parents, siblings, and siblings’ spouses, for a total of 214 nontwin individuals.
The question of biased data collection based on visual impressions of twin type is a concern in every twin study. We handled this issue in various ways, based on the different tests and activities we administered, but general rules were followed to maintain impartiality. For example, the IQ tests were administered by different examiners who were not part of the research team, the twins were kept apart while they completed questionnaires, and each twin received the same protocols at the same time as his or her co-twin (or one immediately after the other) to avoid exchange of information.
I may have expressed misgivings to them. ” Sines recalled the well-known MZA twins Oskar and Jack, raised Catholic in Nazi Germany and Jewish in Trinidad, respectively, and speculated about the effects of their rearing situations on their personalities and politics. ” I will return to our findings on Oskar and Jack in later chapters of this book. Sines’s interviews were discontinued (as were some other tests and activities) once the assessment schedule grew longer, but Bouchard has always said that the twins appreciated them.