Nature versus Nurture

Some experts assert that who we are is a result of nurture—the relationships and caring that surround us. Others argue that who we are is based entirely in genetics. According to this belief, our temperaments, interests, and talents are set before birth. From this perspective, then, who we are depends on nature.

One way researchers attempt to measure the impact of nature is by studying twins. Some studies have followed identical twins who were raised separately. The pairs shared the same genetics but in some cases were socialized in different ways. Instances of this type of situation are rare, but studying the degree to which identical twins raised apart are the same and different can give researchers insight into the way our temperaments, preferences, and abilities are shaped by our genetic makeup versus our social environment.

For example, in 1968, twin girls were put up for adoption, separated from each other, and raised in different households. The adoptive parents, and certainly the babies, did not realize the girls were one of five pairs of twins who were made subjects of a scientific study.

In 2003, the two women, then age thirty-five, were reunited. Elyse Schein and Paula Bernstein sat together in awe, feeling like they were looking into a mirror. Not only did they look alike but they also behaved alike, using the same hand gestures and facial expressions. Studies like these point to the genetic roots of our temperament and behavior.