  Ayer was unmoved by the objections. He replied to Austin’s attack in “Has Austin Refuted Sense-data Theory” (Ayer 1967), with Ayer defending the viability of the distinction between veridical and non-veridical perception, and maintaining that the argument from illusion was only one source of the case for sense-data.  (For an in-depth discussion of the dispute between Austin and Ayer, see Mike Thau, “What is Disjunctivism” 2004). Against Strawson (“Replies” 1979) he noted that there was considerable agreement between them: in particular, they both agreed that perceptual judgments contain implications going beyond those carried by a ‘strict’ account of our sensible experience. The disagreement was primarily about whether the perceptual judgments were based on, or were inferred from, awareness of sense-data. Ayer conceded that such an inference would be only implicit. The point about language he conceded as well, maintaining only that the assumptions often built into concepts descriptive of physical objects – the accessibility of such objects to other observers, that they continued to exist unperceived, and so on, would not be in play when these concepts were used to provide the ‘strict’ account of perceptual experience.