However, indexicality has remained an issue of interest to philosophers who work on language. In contemporary analytic philosophy, the preferred nominal form of the term is "indexical" (rather than "index"), defined as "any expression whose content varies from one context of use to another ... instance pronouns such as 'I', 'you', 'he', 'she', 'it', 'this', 'that', plus adverbs such as 'now', 'then', 'today', 'yesterday', 'here', and 'actually'. This exclusive focus on linguistic expressions represents a narrower construal than is preferred in linguistic anthropology, which regards linguistic indexicality ("deixis") as a special subcategory of indexicality in general, which is often nonlinguistic; see above.