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Twin Study

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Submitted By jajamasir
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This article discusses about twins separated and the genetic of personality differences and concentrated on studies that have been made in 1979 by the Minnesota Study of Twins Reared Apart
( MISTRA). In the research, the researcher focused on two aspects of cognitive and personality.
However, in this article the discussion limited to discuss about the personality and behavioral differences only. The study conducted by Minnesota is to support the existence of an important genetic component in behavioral and personality differences. According to the author, the study has been done by MISTRA are biased toward the sample, based on Newman et al. and Shields studies, MISTRA twins were discovered on the basis of similarity and their knowledge of each other's existence. Also,
Minnesota study also lack of case histories and the failure to share data. The reports of Newman et al.,
Shields, and Juel-Nielsen contained hundreds of pages of detailed case histories of twins, which helped independent observers to draw their own conclusions from the data. Although most of the earlier researchers were viewing twins through a hereditary lens, their descriptions provided a wealth of information. In this study, they are used several type of method, one of the technique is used two or more test instrument to ensure the adequate coverage, for example the participants were given a battery of personality and mental ability tests, interest and value inventories and psychomotor tests. In addition, separate of examiners administer the IQ test, life history interview, psychiatric interview and sexual life history interview. The twin also complete questionnaire independently under the constant supervision of the staff members.

As a result, researchers have found that the degree of MISTRA comparable personality similarities between reared apart and reared-together twins shows that a normal family environmental factors had no significant influence on adult personality. The 50% of the environmental variance appears due mainly to unusual environmental factors and measurement error.

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