I first read this post by Scott Adams:
Quantifying Gullibility
http://dilbert.com/blog/entry/quantifying_gullibility/
Which lead me to read the article he referenced:
Research Pinpoints Brain’s ‘Gullibility’ Center
Changes in this region could explain why seniors, children are less doubting
http://health.usnews.com/health-news/news/articles/2012/08/24/research-pinpoints-brains-gullibility-center
I admit …