Shared And Nonshared Environment Analysis Essay

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Article 2 The role of shared and nonshared environments both affect developing children, however, the exact extent is unknown. Thomas Bouchard investigates the role of shared environments on the development of IQ concerning identical twins reared apart. The purpose of the study was to learn whether or not shared environments and the IQ of identical twins reared apart demonstrated a high or low correlation. Previous research prior to this article indicates that shared environments and developing IQ demonstrate high correlation. The researchers measured IQ by classifying twins into high and low similarity groups based on four different environmental measures: age of separation, reunion in childhood, rearing by a relative, and similarity in social environment. Each twin was placed into two groups for all the measurements. The classification of groups entailed (in order), twins that were separated before and after six months of age, reunion before and after testing, reared by family or non-family member, and …show more content…

For the measure assessing age of reunion, the results indicate there is a high level of overall correlation between identical twins reared apart. Thus, the identical twins that were not reunited prior to testing exhibited the same development and intelligence as the twins that were reunited before testing. The next measure, rearing by a relative, revealed that identical twins that are raised by unrelated family members are essentially no different from identical twins reared by biological parents, as evidenced by the heritability values. Lastly, identical twins that were reared in minimally similar environments demonstrated more similarity than twins reared in strongly similar environments (.70 vs .67). This is interesting because one would expect the twins in strongly similar environments to be more

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