The notion of representation figures centrally both in Descartes’ scientific theorizing about sense in humans and in his conceptual speculations about the nature of human cognition.Descartes’ philosophical innovation in the Dioptrics is the claim that sensing in humans is a kind of representing rather than a kind of resembling. This provides the cornerstone for his attack on traditional theories of sense, and it underwrites his own position that sensing is a kind of thinking, ascribable to the rational soul rather than (...) to any Aristotelean sensitive soul. (shrink)

This chapter explains Descartes confusion on sensations, size, shape, position, and motion. Descartes in detail explains that we perceive particular figures or actual bodies affecting our senses much more distinctly than their colours. Descartes construe the perception of position, distance, size, and shape as involving strong intellectual elements and he holds that they differ in this fundamental respect from ordinary perceptions of color, sound, heat and cold, taste, and the like, which are said to consist just in having “sensations” that (...) “arise from the mind-body union.” This position leaves room for uncertainty about what he means when he speaks elsewhere of the near-uselessness of sense perceptions in informing us of particular qualities of bodies, in so far as it opens the possibility of a quite restricted understanding of “sense perception” in these contexts. (shrink)