Over at The Frontal Cortex, there is a brilliant analysis of an old and a new study that reinvents the idea and purpose of rationality and reasoning.
"That voice in your head spewing out eloquent reasons to do this or do that doesn’t actually know what’s going on, and it’s not particularly adept at getting you nearer to reality. Instead, it only cares about finding reasons that sound good, even if the reasons are actually irrelevant or false. (Put another way, we’re not being rational – we’re rationalizing.)"
Being on a thought provoking roll, he also has an excellent post on the debate between free will and scientific determinism that is definitely worth a read. Lets hope he keeps it up.