Kant's Transcendental Deduction of the Categories: Unity, Representation, and Apperception is a distinctively new reading of the Transcendental Deduction of the Categories in the Critique of Pure Reason. Lawrence J. Kaye has discovered a number of previously overlooked arguments and explanations, one of the most significant being an argument that demonstrates that the use of concepts requires the necessary unity of consciousness. He also provides a detailed investigation of Kant's account of representation in the first edition of the Transcendental Deduction of the Categories and shows how it can be understood as a unique type of functional role view. This view of representation leads to a new understanding of Kant's blend of realism and idealism.