 If the doctrine of space and time is the first major part of his model of the mind, the doctrine of synthesis is the second. Kant claimed, as we saw earlier, that three kinds of synthesis are required to organize information, namely apprehending in intuition, reproducing in imagination, and recognizing in concepts (A97-A105). Each of the three kinds of synthesis relates to a different aspect of Kant’s fundamental duality of intuition and concept. Synthesis of apprehension concerns raw perceptual input, synthesis of recognition concerns concepts, and synthesis of reproduction in imagination allows the mind to go from the one to the other. 