=Paper=
{{Paper
|id=Vol-2481/paper51
|storemode=property
|title=Defining Action Types: on the roles of Thematic Structures and Argument Alternations
|pdfUrl=https://ceur-ws.org/Vol-2481/paper51.pdf
|volume=Vol-2481
|authors=Massimo Moneglia,Alessandro Panunzi,Rossella Varvara
|dblpUrl=https://dblp.org/rec/conf/clic-it/MonegliaPV19
}}
==Defining Action Types: on the roles of Thematic Structures and Argument Alternations==
Defining Action Types: on the roles of Thematic Structures and Argument Alternations Massimo Moneglia Alessandro Panunzi Rossella Varvara Università di Firenze Università di Firenze Università di Firenze massimo.moneglia@unifi.it alessandro.panunzi@unifi.it rossella.varvara@unifi.it Abstract of action conceptualization, the linguistic and the cognitive levels of categorization are not equiv- English. The paper focuses on the relation alent and should not be confused (Croft, 2012; between Action Types (ontological objects Moneglia, 2014). As a matter of fact, the lexical that identifies the referential potential of a category instantiated by an action verb can refer to verb) and the Thematic Structure and Al- more than one cognitive entity. ternations of verbs. The empirical anal- For instance, the verb to push can refer to actions ysis shows that these linguistic features in which the force causes the movement of the ob- are not properties of the verb itself, but ject in space (e.g. in a sentence like John pushes vary in relation to its referential variation. the basket under the table), as well as to actions in Given this evidence, we argue that The- which the object does not move (e.g. John pushes matic Structure and Argument Alternation the fabric into a ball). This differential property is can help in the identification of the differ- more than enough to cognitively distinguish these ent types of action to which a verb refers, events in different action concepts. As a conse- providing evidences to define the granular- quence, the need for a cognitive level of action cat- ity of action concepts in the development egorization which is independent from the lexical of an ontology of actions. one becomes clear. In this paper, we investigate the role of one type 1 Introduction of linguistic information, specifically Thematic Structure and Argument Alternations, in the defi- Action verbs are among the most frequent words nition of action types, i.e. types of action concepts in ordinary communication, and their correct pro- that gather together single datapoint in the IMA- cessing constitutes an underpinning element for a GACT ontology of actions. We point out that The- wide series of human-machine interaction tasks. matic Structure is not a property of the verb itself, The formalization of action verb meanings has of- since different structures may be present for the ten been linked to propositional representations same verb. Our aim is to show how these features within decompositional approaches (Dowty, 1979; are linked to action types and how this correlation Rappaport Hovav and Levin, 2012), in which the can be useful for the definition and the induction semantic core of the verb remains a non-analyzed of Action Types1 . lexical root. Other traditional components used in the representation and annotation of the meaning In section 2, we show the innovative methodol- of action verbs are: the temporal and aspectual ogy assumed by the IMAGACT Ontology of Ac- properties of verbs (Vendler, 1957; Pustejovsky, tion for representing the meaning of action verbs, 1991); the thematic roles of participants (Fill- focusing on their referential properties rather than more, 1967; Gruber, 1965); the force dynamics on their intensional definition. In sections 3 and and causal relations implied (Talmy, 1988; Croft, 4, we will see through a case study that the induc- 2012; Gärdenfors, 2014). tion of the referential variation of verbs can take Nevertheless, even if these semantic components advantage of linguistic features. Thematic Struc- are usually assumed to reflect the general structure 1 Similarly, previous work in Word Sense Disambiguation Copyright c 2019 for this paper by its authors. Use per- (Dang and Palmer, 2005; Roberts and Kordoni, 2012) have mitted under Creative Commons License Attribution 4.0 In- shown that thematic information can improve verb sense dis- ternational (CC BY 4.0). ambiguation. tures and their Alternations can have an impact in that could co-extend to the same scene (Mon- the definition and characterization of the objects in eglia et al., 2018a). An additional validation, an ontology of actions. in which raters were asked to assign scenes to ATs, was conducted with an overall agreement of 2 The IMAGACT ontology 0.8 (Gagliardi, 2014). Lastly, during the ontol- ogy’s development, Thematic Structure, Alterna- In the IMAGACT multilingual Ontology of Ac- tions and Aktionsart were manually annotated for tions2 (Moneglia et al., 2012b; Panunzi et al., the linguistic captions of each scene. These lat- 2014) action concepts are not defined through ter annotations will be the starting point of the a propositional and truth conditional perspective, present study, in which we analyze the correlation but they are rather identified and visually repre- between ontological entities (ATs) and linguistic sented through scenes. Each scene is conceived as features, specifically Thematic Structure and Al- a prototypical instance (Rosch, 1983) of an action ternations. concept and constitutes the basic entity of refer- ence of the action ontology. Scenes have been de- 3 Thematic Structure and Action Types rived from a complex annotation procedure (Mon- eglia et al., 2012a) of the occurrences of action Thematic structure and syntactic frame informa- verbs3 in two large spoken resources of English tion of verbs are usually provided by most lex- and Italian. After this bootstrapping phase, the ical resources, such as VerbNet (Kipper-Schuler, ontology has been extended to many other lan- 2005), FrameNet (Fillmore et al., 2004) and Prop- guages exploiting competence judgments by na- Bank (Palmer et al., 2005). In these resources, tive speakers (Brown et al., 2014; Pan et al., 2018; the different entries of a verb are associated to Moneglia et al., 2018b). The whole IMAGACT their possible thematic structures. They include database is currently comprised of 1,010 scenes manually annotated data and have been useful for linked to more than 8,700 verbs in 13 languages4 . the development of statistical approaches for Se- As a result, action concepts have been represented mantic Role Labeling (Gildea and Jurafsky, 2002) by language independent scenes, each one linked and for various NLP applications (e.g. informa- to the series of verbs that can be used to refer to tion extraction (Surdeanu et al., 2003), summa- it. The scenes are described by linguistic captions rization (Melli et al., 2006), and machine trans- (i.e. short sentences) that have as predicates each lation (Boas, 2002)). of those verbs. Simultaneously, each verb is con- In this section, we show that Thematic Struc- nected to a set of scenes in the ontology, represent- ture (TS) is not a property of the verb and we will ing in this way its referential variation. verify: 1) to what extent it can be considered a The scenes linked to a verb have been then property of the action types in the variation of a grouped in broader categories called Action verb; 2) to what extent it can provide a differential Types5 (hereafter also ATs or Types). ATs are de- feature for the identification of ATs. We consider fined as higher level concepts which fall in the se- as TS the minimal themathic structure7 which is mantic variation of a verb, useful to represent its necessary to interpret a verb as an instance of a referential potential in a more compact way, re- specific AT. ducing an excessive granularity in the representa- There are cases in which the TS is the same tion of meaning6 . ATs have been created exploit- all through the verb variation. Frequently, one ing similarity judgments among scenes and con- specific thematic structure is associated to activity sidering Local Equivalent verbs, i.e. all the verbs verbs that show almost no variation in their mean- 2 ing. This is the case of the verb to drink, who has Freely accessible at http://www.imagact.it/ 3 only one AT. The verb to close, on the contrary, Only in their basic, physical meaning, so excluding all metaphorical and phraseological uses. shows a significant variation in the IMAGACT on- 4 Besides English and Italian, the list of fully mapped lan- tology (7 ATs, four of them represented in table guage comprenends: Arab, Chinese, Danish, German, Hindi, 1), but all types present the same TS (AG-V-TH). Japanese, Polish, Portuguese, Serbian, Spanish, Greek. 5 See, for instance, Table 1 which represents the main vari- In these cases, thematic structure cannot play any ation of the action verb to close. role in the definition of different types, which are 6 As a matter of fact, some verbs in IMAGACT can be 7 linked to several dozen scenes, and the most general ones, The set of roles used in IMAGACT is based mainly on like to take and to put, are linked to about 100 scenes. the set used in VerbNet. Mary presses the fabric into a ball AG-V-TH-DEST to push, to squeeze, to compress Mary closes her hand Mary closes the umbrella Table 3: To press, type b The doctor presses the shoulder AG-V-TH to push, to poke Mary closes the door Mary closes the lock Table 1: Variation of to close Table 4: To press, type c John presses the identified on the basis of ontological features of button the theme (e.g. a body part vs an artifact) or by the AG-V-TH kind of result produced (spatial consequences vs to push functional consequences), and even by the set of equivalent verbs which provide a differential prop- Table 5: To press, type d erty of each ATs (to shut vs. to lock vs. to close up vs. to clench). John presses the Verbs like to close shows that TS is not a nec- pedal essary differential of ATs, but, as the next exam- AG-V-TH ples will point out, it can help to select among to push the interpretations of a general verb. This is the case with verbs like to press and to push which Table 6: To press, type e record different TSs possibilities across their vari- ation. Let’s consider the verb to press. In the IMA- GACT ontology it shows 10 different ATs. We can and the concept implies a compression as an inter- observe groups of Types that share the same TS. subjective activity, whereas in type d the Theme Types a (table 2) and b (table 3) present Agent- is an object and the compression implies a func- Verb-Theme-Destination structure. In both cases, tional correlation. In type e the Theme undergoes the destination is necessary to represent the event a continuous scalar pressure, not limited to a sin- type, which cannot be identified otherwise. In type gle impulse. a, the Agent compacts the Theme into a block, Although these TS commonalities among types changing its shape but not its volume. In type b show that TS is not necessarily predictive of a the Agent squeezes the Theme, reducing its vol- single type, TS helps in the distinction of action ume. types. For example, TS restricts the range of pos- sible interpretation of a general verb like to press John presses the in the case of type a and type b (table 2 and 3) scraps into a block versus type c, d and e (tables 4, 5 and 6). The AG-V-TH-DEST distinction between these groups of types (which to push, to compact is independently motivated) is mirrored by the dif- ferent TSs. Table 2: To press, type a TS may constitute an important feature for the definition of granularity of action types in the verb Types c, d and e (tab.4, 5, 6) differ from types a variation. Type c (the doctor presses the shoul- and b since Destination is not necessary and AG- der, tab.4) and type f (the thief presses the gun V-TH is sufficient to identify the action. into Marys back, tab.7) are distinguished in reason Despite the common Thematic Structure, they of their TS: they are similar actions from a cog- clearly identify different actions for cognitive rea- nitive point of view and they can be paraphrased sons. In type c the Theme is a humans body part, both with to push, but the TS of the verb in the two events is different. has been previously stated that it shows the cona- tive alternation, i.e. “a transitivity alternation in The thief presses the gun into Mary’s back which the objects of the verb in the transitive vari- AG-V-TH-DEST ant turns up in the intransitive conative variant to push as the object of the preposition in a prepositional phrase headed by the preposition at (sometimes on with certain verb of ingesting and the push/pull Table 7: To press, type f verbs)” (Levin, 1993, p.42). However, only four types of press allow for the conative alternation , Two cases in the variation of to press are char- as illustrated in the examples below: acterized by a specific TS: type g (AG-V-TH- INSTR) and type h (AG-V-TH-RESULT). Type g • Type c: The doctor presses the shoulder → (tab. 8) necessarily requires the instrument in its The doctor presses on the shoulder minimal structure, contrary to all other types; type h (tab. 9) requires the expression of the result of • Type d: John presses the button → John the action. TS is predictive of the Action Type in presses on the button those cases. • Type e: John presses the pedal → John The tailor presses the cloth with the iron presses on the pedal AG-V-TH-INST to push Other types result in agrammatical sentences when the conative alternation is applied: Table 8: To press, type g • Type a: *John presses at/on the scraps into a block John presses the can flat • Type g: *The tailor presses at/on the cloth AG-V-TH-RESULT with the iron to push Considering now to push, a verb that shares many interpretations with to press, only some Table 9: To press, type h types of to push (types a, b, c, d but not e, f and g) allow this alternation: Considering the variation of a verb like to press8 , we can conclude that TS is not peculiar • Type a: John pushes the button → John of the verb but is related to its types. Given the pushes on the button cases in which one TS is shared by multiple types, it is clear that types distinction is not a function • Type b: John pushes the shoulder → John of the thematic variation (which is actually related pushes on the shoulder to the intersection of multiple features). However, TS has a role in type prediction, since it helps iden- • Type c: John pushes the lever → John pushes tifying the features of a type. on the lever 4 The role of Argument Alternation • Type d: John pushes the pedal → John pushes on the pedal Argument Alternations (AAs) are one of those properties of the verb that have received great at- • Type e: Mary pushes the chair → *Mary tention in a large body of literature after Levin pushes on the chair (1993). As we will see, also AAs are not proper- ties of the whole verb, but rather characterizes the • Type f : Mary pushes the toothpaste → *Mary verb in its types. Considering the verb to press, it pushes on the toothpaste 8 Further similar examples have been extracted from the IMAGACT ontology; however, for space limitations, we re- • Type g: Mary pushes the fabric → *Mary fer only to the cases already discussed. pushes on the fabric In addition to the conative alternations, other • Type f : the thief presses the gun into Marys two alternations can be seen in the variation of the back → the thief presses Marys back with the verbs considered: the resultative construction and gun9 the theme-instrument alternation. The resultative For the verb to push, only types i and d allow it: construction presents a phrase that describes the state achieved by the referent of a noun phrase as • Type i: The thief pushes the gun into Marys a result of the action. As noted already by Levin back → The thief pushes Marys back with the (1993, p. 100), it cannot be predicated in case of gun oblique: • Type d: John pushes the pedal → John pushes (1) a. The silversmith pounded the metal the foot on the pedal flat. As a whole, if considered together, TS and AA b. *The silversmith pounded on the metal can reduce the underdetermination of types. In flat. other words, when two types share the same TS, This alternation is found only in type h for to they can be predicted from a difference in their press: argument alternations. This is the case, for ex- ample, for types a (table 2) and f (table 7) of to • John presses the can → John presses the can press, which share the TS AG-V-TH-DEST, but flat differ with respect to the theme-instrument alter- ation: only type f allows it, not type a. Lastly, we find an alternation between the In the variation of to push, types e and a share Theme and the Instrument, not listed in Levin the same TS (AG-V-TH) but type e does not al- (1993). In this case, the Instrument from sentence low the conative alternation (6=Mary pushes on the 2b (which can be seen as the result of a conative chair), contrary to types a (John pushes on the but- alternation) becomes the Theme in sentence 2c. ton). (2) a. The doctor pushes the shoulder with 5 Conclusion his hand b. The doctor pushes on the shoulder In this paper we have investigated the relation be- with his hand tween Thematic Structure and Action Types. The c. The doctor pushes his hand on the empirical analysis reveals that Thematic Structure shoulder and Argument Alternations are not properties of the whole verb, but rather of the verb in its Types. This alternation can be considered as a particu- We have provided evidence about the saliency of lar case of locative alternation. In terms of Levin both Thematic Structure and Argument Alterna- (1993), the noun shoulder would represent the lo- tions in the identification of Action Types. Al- cation argument, whereas hand would be consid- though TS and AA do not determine the variation ered the locatum. Also in this case, the theme- of a verb across different ATs, these linguistic fea- instrument alternation does not apply to all types tures can, indeed, reveal characterizing features of of the variation of to press, but rather characterizes a Type, helping us in the disambiguation of con- specific types. cepts and in the recognition of the necessary level of granularity in building our ontologies. • Type g: the tailor presses the clothes with the iron → The tailor presses the iron on the clothes References Hans Christian Boas. 2002. Bilingual framenet dic- • Type c: the doctor presses the shoulder → the tionaries for machine translation. 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