 As noted, Mead was indebted to Hegel’s work, and the notion of reflexivity plays a fundamental role in Mead’s theory of mind. Vocal gestures—which depend on sufficiently sophisticated nervous systems to process them—allow individuals to hear their own gestures in the way that others hear them. If I shout “Boo” at you, I might not only scare you, I might scare myself. Or, to put this in other terms, vocal gestures allow one to speak to oneself when others are not present. I make certain vocal gestures and anticipate how they would be responded to by others, even when they are not present. The responses of others have been internalized and have become part of an accessible repertoire. (Mead would agree with Ludwig Wittgenstein that there are no private languages. Language is social all the way down.) According to Mead, through the use of vocal gestures one can turn “experience” back on itself through the loop of speaking and hearing at relatively the same instant. And when one is part of a complex network of language users, Mead argues that this reflexivity, the “turning back” of experience on itself, allows mind to develop.