Published online by Cambridge University Press: 22 July 2009
In the 18th century, David Hume said that every idea is built up from copies of prior impressions. In modern terminology: all concepts are built up from stored records of perceptual states. This empiricist credo is enjoying a resurgence these days. Researchers in numerous fields are seriously investigating the hypothesis that thought has a perceptual basis. They are questioning the rationalist assumptions that have dominated cognitive science since its inception in the 1950s. Empiricism is still a fringe movement, however. It is often dismissed as gratuitously radical and utterly indefensible. That attitude has become something of a dogma, but it derives from two serious worries. One of them has to do with innate ideas. Empiricists have tended to be antinativists, and the current orthodoxy in cognitive science is to postulate a considerable amount of innate knowledge. I think the orthodoxy is mistaken, but I will have little to say about that here. The second major reason for rejecting empiricism has to do with abstract ideas. We often think about things that are far removed from sensory experience. There is no way to paint a mental picture of truth, justice, democracy, or necessity. If empiricism is to have any hope of success, it must be able to explain how we come to think about things at this level of abstraction.
I think the objection from abstract ideas must be dismantled piecemeal. There are different kinds of abstract ideas, and these must be accommodated in different ways.
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