Animacy Acquisition Using Morphological Case Riyaz Ahmad Bhat Dipti Misra Sharma LTRC, IIIT-Hyderabad, India LTRC, IIIT-Hyderabad, India
[email protected] [email protected] Abstract ever, animacy is not seen as a dichotomous vari- able, rather a range capturing finer distinctions of Animacy is an inherent property of en- linguistic relevance. Animacy hierarchy proposed tities that nominals refer to in the phys- in Silverstein’s influential article on “animacy hi- ical world. This semantic property of a erarchy” (Silverstein, 1986) ranks nominals on a nominal has received much attention in scale of the following gradience: 1st pers > 2nd pers both linguistics and computational linguis- > 3rd anim > 3rd inanim. Several such hierarchies tics. In this paper, we present a robust of animacy have been proposed following (Silver- unsupervised technique to infer the ani- stein, 1986). One basic scale taken from (Aissen, macy of nominals in languages with rich 2003) makes a three-way distinction as humans > morphological case. The intuition behind animates > inanimates. These hierarchies can be said our method is that the control/agency of to be based on the likelihood of a referent of a a noun depicted by case marking can ap- nominal to act as an agent in an event (Kittila¨ et proximate its animacy. A higher control al., 2011). Thus higher a nominal on these hier- over an action implies higher animacy. Our archies higher the degree of agency/control it has experiments on Hindi show promising re- over an action. In morphologically rich languages, sults with Fβ and P urity scores of 89 and the degree of agency/control is expressed by case 86 respectively.