Using Wittgenstein's recently published writings on the philosophy of psychology, together with unpublished material, Paul Johnston presents a thorough account of a subject that was central to Wittgenstein's later work. He shows that Wittgenstein's arguments involve a radical re-thinking of our understanding of the inner and present a challenge to contemporary views which has yet to be fully appreciated or understood.

Wittgenstein demonstrates how a Wittgensteinian approach can dissolve age-old problems about the nature of consciousness and the relationship between the mind, the body, and the soul. The resulting picture of the inner, with its stress on the crucial role of language, sheds light on the direction of Wittgenstein's work and presents a stimulating and controversial alternative to more fashionable positions on the subject.