Abstract
The concept of experience has been central to European philosophy since Descartes. He was the first to use experience to distinguish between two kinds of substance, mental and material, on the basis of the fact that one kind of substance is extended but does not think, while the other kind thinks, doubts, wills, imagines and feels, but is not extended. Other philosophers, such as Hobbes, Locke and Hume, made the concept of experience the basis of their analysis of knowledge. These ideas have become part of common sense, and provide the background for a range of philosophical problems from Descartes’ time to the present. While the concept of experience is important for philosophy, philosophers do not all have the same understanding of the nature of experience.