tailieunhanh - Báo cáo khoa học: "A robust and extensible exemplar-based model of thematic fit"

This paper presents a new, exemplar-based model of thematic fit. In contrast to previous models, it does not approximate thematic fit as argument plausibility or ‘fit with verb selectional preferences’, but directly as semantic role plausibility for a verb-argument pair, through similaritybased generalization from previously seen verb-argument pairs. This makes the model very robust for data sparsity. We argue that the model is easily extensible to a model of semantic role ambiguity resolution during online sentence comprehension. . | A robust and extensible exemplar-based model of thematic fit Bram Vandekerckhovea Dominiek Sandraa Walter Daelemansb aCenter for Psycholinguistics bCenter for Dutch Language and Speech CNTS University of Antwerp Antwerp Belgium @ Abstract This paper presents a new exemplar-based model of thematic fit. In contrast to previous models it does not approximate thematic fit as argument plausibility or fit with verb selectional preferences but directly as semantic role plausibility for a verb-argument pair through similaritybased generalization from previously seen verb-argument pairs. This makes the model very robust for data sparsity. We argue that the model is easily extensible to a model of semantic role ambiguity resolution during online sentence comprehension. The model is evaluated on human semantic role plausibility judgments. Its predictions correlate significantly with the human judgments. It rivals two state-of-the-art models of thematic fit and exceeds their performance on previously unseen or low-frequency items. 1 Introduction Thematic fit or semantic role plausibility is the plausibility of a noun phrase referent playing a specific semantic role like agent or patient in the event denoted by a verbal predicate . the plausibility that a judge sentences someone which makes the judge the agent of the sentencing event or that a judge is sentenced him- or herself which makes the judge the patient . Thematic fit has been an important concept in psycholinguistics as a predictor variable in models of human sentence comprehension either to discriminate between possible structural analyses during initial processing in constraint-based models see MacDonald and Seidenberg 2006 for a recent overview or after initial syntactic processing in modular models . Frazier 1987 . In fact thematic fit is at the core of the most-studied of all structural ambiguity phenomena the ambiguity between a main clause or a .