Abstract

This paper offers a defence of sense-datum statements from A.J. Ayer’s perspective that represents a response to Quine’s naturalistic ontology. Starting with Quine’s “On What There Is” (1948), and the following “Symposium” of 1951, I argue that Ayer’s proposed method of establishing sense-datum statements in his “Symposium” piece, which challenges Quine’s ontology of physical objects, is not a viable alternative to Quine’s scientific naturalism. I argue that by taking a broadly intensional approach, Ayer can offer a response to Quine’s position. More specifically, I contend that it is possible to form a distinctly non-scientific, epistemological account of sense-data by employing primitive “sensory predicates” within basic propositions. In terms of ontology, a technical ruling for “existence”, working alongside appropriate “meaning-rules”, legislates for basic sense-datum statements, thus distancing them from the regimented, extensionalised, stimulus meaning strategy indicative of Quine’s naturalistic ontology.