Abstract

I argue that Kant’s threefold synthesis of the fundamental act-types of the apprehension, reproduction, and recognition of a manifold of sense-impressions, as presented in the A-Deduction (see A97-110), holds the key to understanding the origin of the categories, or concepts of an object in general, as treated in their Metaphysical Deduction. To that end, I reconstruct Kant’s analysis of a synthesis of empirical intuition (I.), in order to then, on that basis, reconstruct Kant’s concept-formation of the categories (II.). As it turns out, the threefold synthesis as exercised regarding a manifold of sense-impressions in an empirical intuition of an object can indeed account for the representational contents of the categories of quality (apprehension), quantity (reproduction), relation (recognition), and modality (relating to the object through a manifold of sense-impressions). It is in this sense that the categories are “concepts of synthesis” (A80/B106) or, more precisely, “concepts of the synthesis of possible sensations” (A723/B751).