Chiao and Blizinsky (2010) suggest that some populations initially had a higher risk of depression

(because they carried more short alleles of 5-HTT), and that these populations gradually developed collectivistic values to protect them against the dangers of depression. Interestingly, observed prevalence rates of depression in collectivistic cultures are lower. However, this may be due to somatization and reporting bias (see

“The role of clinical biases in diagnosis”).

Can you identify the research method used in this study?

Based on this, what are the strengths and limitations of the study? To what extent do you think “culture-gene coevolution theory” is justied by the empirical data?