Building and interpreting ad hoc categories: a linguistic analysis

The aim of this paper is to examine in a systematic way the linguistic expression of a particular type of categorization process, namely the construction of ad hoc categories. Based on a 60 language-sample and corpus data from English and Italian, it will be shown that the strategies used to refer to ad hoc categories are mobilized from a variety of different grammatical areas, ranging from connectives to special plural forms and derivational affixes. We will first provide a detailed semantic analysis of the constructions under exam, and then move to the examination of the morphosyntactic and functional patterns of variation attested in our data. Though highly differentiated, the pool of strategies employed to make reference to ad hoc categories shows systematic correlations between specific morphosyntactic features, different degrees of context dependency and different types of abstraction processes (e.g. leading to the construction of a set, a frame or a class). We will conclude with a preliminary analysis of how ad hoc categories are built and used in discourse. Corpus data will lead us to propose a shift of attention from ad hoc categories themselves to on line categorization, namely the process through which categories are abstracted from specific exemplars in context, regardless of their common or ad hoc nature. 1.