A study conducted by Chiao in October 2009 looked at both genetic and cultural factors influencing depression. It found that East Asians disproportionately possess a genetic trait (a short allele on their serotonin transporter gene) that makes them more susceptible than Americans to depression when exposed to stress. And yet Americans have a higher incidence of depression. Chiao concluded that the collectivist culture of East Asians supersedes their genetics in helping to fight off depressive tendencies. (Sharon Begley, Sharon.West Brain, East Brain - What a difference culture makes. Newsweek Magazine, March 1 issue, 2010.)