Why does the competitive culture (such as that in the US) lead to individual cognitive

[Pluto C. Rat]

decline...? ...while the teamwork culture (such as that in Japan) leads to individual cognitive development -- such as working memory, self-monitoring, and the ability to suppress external and internal distractions?

http://news.yahoo.com/s/hsn/20101105/hl_hsn/goodconversationcanboostbrainpowerstudyfinds