From which study were the participants in Brendgen's research recruited?

• A. Montreal Twin Study
• B. Quebec Newborn Twin Study
• C. Quebec Childhood Development Study
• D. Canada National Twin Study

Answer: (B)

Brendgen's research drew its participants from the Quebec Newborn Twin Study. This particular study is significant as it focuses on the genetic and environmental influences on development from early childhood. By recruiting twins from this study, Brendgen was able to explore the interactions between nature and nurture in relation to social and emotional development among twins. The unique perspective provided by studying twins allows researchers to better understand the heritability of behaviors and traits, which is central to the findings in Brendgen's work. Each of the other studies mentioned also focuses on twins but may emphasize different aspects or stages of development, making the Quebec Newborn Twin Study the most relevant source for Brendgen's research on early development.