Abstract

Let’s define epistemological direct realism as the view that we have noninferentially justified beliefs in at least some contingent propositions describing the external physical world. I add the adjective “external” here so as to leave open the question of whether sensations and other mental phenomena are themselves physical. I take it that an indirect realist can consistently maintain both that all knowledge of external physical reality must be inferred from knowledge of subjective sensations and also conclude that subjective sensations are, for example, brain states. It’s a bit awkward, however, to use the cumbersome expression “external physical reality” and so for ease of exposition I shall often omit the adjective “external.” I shall say that a proposition describes the physical world only if its truth entails a proposition which attributes to some object those properties in virtue of which the thing is physical. So, for example, I might be able to know that the F exists, where the F is, in fact, a physical object. But if the proposition that the F exists does not entail that the F is physical, the proposition that the F exists is not, in this sense, a proposition describing the physical world. Berkeley, for example, sometimes posed as an epistemological direct realist when he claimed both that we can know unproblematically that certain ideas exist and that a physical object is nothing but a bundle of ideas. But when he was being careful he made clear that the ideas we know directly are never by themselves constitutive of a physical object—at best they are logical “parts” of objects. On his more sophisticated view, knowledge that a given physical object exists would always require inference—complex inference at that. Berkeley was no epistemological direct realist.