It is generally agreed upon that Grice's causal theory of perception describes a necessary condition for perception. It does not describe sufficient conditions, however, since there are entities in causal chains that we do not perceive and not all causal chains yield perceptions. One strategy for overcoming these problems is that of strengthening the notion of causality (as done by David Lewis). Another is that of specifying the criteria according to which perceptual experiences should match the way the world is (Frank Jackson and Michael Tye). Finally, one can also try to provide sufficient conditions by elaborating on the content of perceptual experiences (Alva Nöe). These different strategies are considered in this paper, with the conclusion that none of them is successful. However, a careful examination of their problems points towards the general solution that we outline at the end.

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