 With regard to spoken language, as Casey O’Callaghan (2011) points out, several philosophers have made the claim that after a person learns a spoken language, sounds in that language comes to sound different to them (O’Callaghan cites Block 1995: 234; Strawson 2010: 5–6; Tye 2000: 61; Siegel 2006: 490; Prinz 2006: 452; and Bayne 2009: 390). Ned Block, for instance, writes, “[T]here is a difference in what it is like to hear sounds in French before and after you have learned the language” (1995: 234). It is tempting to think that this difference is explicable in terms of the fact that, after learning a language, a person hears the meanings of the words, where they do not before learning the language. On such a view, meanings would be part of the contents of auditory perception. However, O’Callaghan (2011) denies this (see also O’Callaghan 2015 and Reiland 2015). He argues that the difference is in fact due to a kind of perceptual learning. Specifically, through learning we come to hear phonological features specific to the new language. As O’Callaghan argues, these phonological features, not the meanings, explain what it’s like to hear a new language.