Actually the reason for the research into the third world countries. The researchers believed that there would be a high incident of unreported depression amongst these people and wanted statistics so that this problem could be addressed. They found an increase of depression amongst those that had daily access to television.
They were surprised to discover that depression wasn't a problem amongst those who didn't have televison and yet lived in appauling poverty. They knew exactly what was wrong in their lives and were indeed too busy trying to find solutions these problems. There was a higher incident of anger and frustration amongst these people.
Depression it seems is a result of feeling inadequate, helpless, and not knowing exactly what is wrong. Just not being happy with the status quo.
AlexK