A recent study has shown that the brain structures most suited to introspection are more developed in some people than in others. See Relating Introspective Accuracy to Individual Differences in Brain Structure by Stephen M. Fleming, Rimona S. Weil, Zoltan Nagy, Raymond J. Dolan, and Geraint Rees as published in Science (http://www.sciencemag.org/cgi/content/abstract/sci;329/5998/1541). The same study…