It seems odd that after 370 years or so, since Descartes published his Meditations (1641), we are still wrestling with his thought. Not just philosophers, but scientists who study the mind, as well (see, e.g., Edelman 2006). By the time Descartes himself arrives at his Sixth Meditation, he is wresting with his own thought. Insofar as he defined the self as a thinking thing (res cogitans) in the...