Thomas J. Bouchard Jr. (born October 3, 1937) is an American psychologist known for his behavioral genetics studies of twins raised apart. He is professor emeritus of psychology and director of the Minnesota Center for Twin and Adoption Research at the University of Minnesota. Bouchard received his PhD from the University of California, Berkeley, in 1966.[1]
One of Bouchard's case studies was Jim Springer and Jim Lewis (so-called Jim twins), twins who had been separated from birth and were reunited at age 39.[2] Bouchard arranged to study the pair, assembling a team and applying for a grant to the Pioneer Fund during 1981. According to The Washington Post, the twins "found they had each married and divorced a woman named Linda and remarried a Betty. They shared interests in mechanical drawing and carpentry; their favorite school subject had been math, their least favorite, spelling. They smoked and drank the same amount and got headaches at the same time of day."[2] According to The New York Times they both also owned a dog named "Toy", and had named their first son almost identically, "James Allan" and "James Alan".[3]
Bouchard has said that these two twins happened to be unusually alike, while most twins show more differences:
"There probably are genetic influences on almost all facets of human behavior, but the emphasis on the idiosyncratic characteristics is misleading. On average, identical twins raised separately are about 50 percent similar -- and that defeats the widespread belief that identical twins are carbon copies. Obviously, they are not. Each is a unique individual in his or her own right.[2]
McGue M, Bouchard TJ (July 1984). "Adjustment of twin data for the effects of age and sex". Behavior Genetics. 14 (4): 325–343. doi:10.1007/BF01080045. PMID6542356. S2CID45677867. (Cited >250 times)