http://www.sciencedaily.com/releases/2007/01/070108121659.htm
http://www.sciencedaily.com/releases/2006/09/060926171045.htm
"(University College London) study has found that you are more likely to perform well if you do not think too hard and instead trust your instincts. The research, published online in the journal Current Biology, shows that, in some cases, instinctive snap decisions are more reliable than decisions taken using higher-level cognitive processes."
"According to Princeton University psychologist Emily Pronin, most healthy people also have experienced racing thoughts at some point in time--perhaps when they are excited about a new idea they have just learned, or when they are brainstorming with a group of people, or even when they lie in bed unable to fall asleep."