semantic roles

In certain theories of linguistics, thematic relations, also known as semantic roles or thematic roles, are the various roles that a noun phrase may play with respect to the action or state described by a governing verb, commonly the sentence's main verb. For example, in the sentence "Susan ate an apple", ''Susan'' is the doer of the eating, so she is an agent; ''an apple'' is the item that is eaten, so it is a patient.

Since their introduction in the mid-1960s by Jeffrey Gruber and Charles Fillmore, semantic roles have been a core linguistic concept and ground of debate between linguist approaches, because of their potential in explaining the relationship between syntax and semantics (also known as the syntax-semantics interface), that is how meaning affects the surface syntactic codification of language. The notion of semantic roles play a central role especially in functionalist and language-comparative (typological) theories of language and grammar.

While most modern linguistic theories make reference to such relations in one form or another, the general term, as well as the terms for specific relations, varies: "participant role", "semantic role", and "deep case" have also been employed with similar sense.

History

The notion of semantic roles was introduced into theoretical linguistics in the 1960s, by Jeffrey Gruber and Charles Fillmore,Van Valin Jr, R. D. (2008).
A6 Frame Semantics for Verbs
'. Functional Concepts and Frames – Proposal.Gruber (1965), Fillmore (1968) and also Jackendoff did some early work on it in 1972.

The focus of these studies on semantic aspects, and how they affect syntax, was part of a shift away from Chomsky's syntactic-centered approach, and in particular the notion of the autonomy of syntax, and his recent ''Aspects of the Theory of Syntax'' (1965).

Major thematic relations

The following major thematic relations have been identified:

There are not always clear boundaries between these relations. For example, in "the hammer broke the window", ''hammer'' might be labeled an agent, an instrument, a force, or possibly a cause. Nevertheless, some thematic relation labels are more logically plausible than others.

Grouping into the two macroroles of actor and undergoer

In many functionally oriented linguistic approaches, the above thematic roles have been grouped into the two macroroles (also called generalized semantic roles or proto-roles) of ''actor'' and ''undergoer''. This notion of semantic macroroles was introduced by Van Valin's Ph.D. thesis in 1977, developed in role and reference grammar, and then adapted in several linguistic approaches.Van Valin, R. D. (1999).
Generalized semantic roles and the syntax-semantics interface
In: ''Empirical issues in formal syntax and semantics'', 2, 373–389.

According to Van Valin, while thematic roles define semantic relations, and relations like subject and direct object are syntactic ones, the semantic macroroles of actor and undergoer are relations that lie at the interface between semantics and syntax.Van Valin Jr, R. D. (2005).
Exploring the syntax-semantics interface
', p. 67. Cambridge University Press.

Linguistic approaches that have adopted, in various forms, this notion of semantic macroroles include: the Generalized Semantic Roles of Foley and Van Valin Role and reference grammar (1984), David Dowty’s 1991 theory of thematic proto-roles,Dowty D.R (1991). Thematic Proto-Roles and Argument Selection. Language 67: 547-619 Kibrik's Semantic hyperroles (1997), Simon Dik's 1989 Functional discourse grammar, and some late 1990s versions of Head-driven phrase structure grammar.Bornkessel, I., Schlesewsky, M., Comrie, B. & Friederici, A. (2009).
Introduction - Semantic Roles as a core linguistic concept
', pp.1-2, in I. Bornkessel et al. (Eds), ''Semantic Role Universals and Argument Linking'' (pp. 1-14). Berlin, New York: De Gruyter Mouton.Van Valin Jr, R. D. (2004)
Semantic macroroles in role and reference grammar
' p.62-4, in ''Semantische rollen'', pp. 62-82.

In Dowty’s theory of thematic proto-roles, semantic roles are considered as prototype notions, in which there is a prototypical agent role that has those traits characteristically associated to it, while other thematic roles have less of those traits and are accordingly proportionally more distant to the prototypical agent.Rappaport Hovav, M., & Levin, B. (2015).
The Syntax‐Semantics Interface
', pp. 602–603 in The handbook of contemporary semantic theory, pp. 593-624. The same goes for the opposite pole of the continuum, the patient proto-role.

Relationship to case

In many languages, such as Finnish, Hungarian and Turkish, thematic relations may be reflected in the case-marking on the noun. For instance, Hungarian has an instrumental case ending (-val/-vel), which explicitly marks the instrument of a sentence. Languages like English often mark such thematic relations with prepositions.

Conflicting terminologies

The term ''thematic relation'' is frequently confused with theta role. Many linguists (particularly generative grammarians) use the terms interchangeably. This is because theta roles are typically named by the most prominent thematic relation that they are associated with. Different theoretical approaches often closely tie different grammatical relations of subject and object, etc., to semantic relations. In the typological tradition, for example, agents/actors (or "agent-like" arguments) frequently overlap with the notion of subject (S).

These ideas, when they are used distinctly, can be distinguished as follows:
; Thematic relations
: are purely semantic descriptions of the way in which the entities described by the noun phrase are functioning with respect to the meaning of the action described by the verb. A noun may bear more than one thematic relation. Almost every noun phrase bears at least one thematic relation (the exception are expletives). Thematic relations on a noun are identical in sentences that are paraphrases of one another.
; Theta roles
: are syntactic structures reflecting positions in the argument structure of the verb they are associated with. A noun may only bear one theta role. Only arguments bear theta roles. Adjuncts do not bear theta roles.
; Grammatical relations
: express the surface position (in languages like English) or case (in languages like Latin) that a noun phrase bears in the sentence.

Thematic relations concern the nature of the relationship between the meaning of the verb and the meaning of the noun. Theta roles are about the number of arguments that a verb requires (which is a purely syntactic notion). Theta roles are syntactic relations that refers to the semantic thematic relations.

For example, take the sentence "Reggie gave the kibble to Fergus on Friday."
* Thematic relations: ''Reggie'' is doing the action so is the agent, but he is also the source of the kibble (note Reggie bears two thematic relations); ''the kibble'' is the entity acted upon so it is the patient; Fergus is the direction/goal or recipient of the giving. Friday represents the time of the action.
* theta roles: The verb ''give'' requires three arguments (see valency). In generative grammar, this is encoded in terms of the number and type of theta roles the verb takes. The theta role is named by the most prominent thematic relation associated with it. So the three required arguments bear the theta roles named the agent (Reggie) the patient (or theme) (the kibble), and goal/recipient (Fergus). ''On Friday'' does not receive a theta role from the verb, because it is an adjunct. Note that ''Reggie'' bears two thematic relations (Agent and Source), but only one theta role (the argument slot associated with these thematic relations).
* grammatical relations: The subject (S) of this sentence is ''Reggie'', the object (O) is ''the kibble'', ''to Fergus'' is an oblique, and ''on Friday'' is an adjunct.

See also

* Morphosyntactic alignment
* Case grammar
* Theta roles
* Semantic role labeling, a natural language processing task to automatically determine thematic roles
* Lexical function

References

Citations

Works cited

* Carnie, Andrew. 2007.
Syntax: A Generative introduction
'. 2nd Edition. Blackwell Publishers.
* Davis, Anthony R.: ''Thematic roles''. In: Claudia Maienborn, Klaus von Heusinger, Paul Portner (Hrsg.): ''Semantics: an international handbook of natural language meaning''. Vol. 1. Berlin 2011, S. 399–420.handbook of natural language meaning. Vol. 1. Berlin 2011, S. 399–420.
*
* Fillmore, Charles. 1968. The Case for Case. In Universals in Linguistic Theory, eds. Emmon Bach and R.T. Harms. New York: Holt, Rinehart and Winston.
* Fillmore, Charles. 1971
Types of lexical information
In Semantics. An interdisciplinary reader in philosophy, linguistics and psychology, eds. D. Steinberg and L. Jacobovitz: Cambridge University Press.
* (Chapter V. Thematic Roles, pp. 197–249)
* Angela D. Friederici, Anja Hahne, Axel Mecklinger: ''Temporal structure of syntactic parsing. Early and late event-related potential effects.'' In: ''Journal of Experimental Psychology: Learning, Memory and Cognition.'' 22–5, (1996), S. 1219–1248.
* Gruber, Jeffrey. 1965. Studies in lexical relations, MIT: Ph.D.
* Gruber, Jeffrey ''Thematic relations in syntax.'' In: Mark R. Baltin, Chris Collins (Hrsg.): ''The handbook of contemporary syntactic theory.'' Blackwell, Oxford 2000, ISBN 0-631-20507-1, S. 257–298.
* Harley, Heidi. In press. Thematic Roles. In Patrick Hogan, ed. The Cambridge Encyclopedia of Linguistics. Cambridge University Press.
* Higginbotham, James (1999) ''Thematic Roles'', pp. 837–8, in:
The MIT Encyclopedia of the Cognitive Sciences
', Edited by Keil & Wilson (1999) Cambridge, MA: The MIT Press.
* Jackendoff, Ray. 1983.
Semantics and cognition
'. Cambridge, Massachusetts: MIT Press.
* Jackendoff, Ray. 1990.
Semantic structures
'. Cambridge, Massachusetts: MIT Press.
* McRae, Ken and Ferretti, Todd R. and Amyote, Liane: ''Thematic roles as verb-specific concepts.'' In: ''Language and cognitive processes.'' 12-2/3, (1997) 137–176.
* Primus, Beatrice: ''Semantische Rollen.'' Winter, Heidelberg 2012, ISBN 978-3-8253-5977-5
* Primus, Beatrice: ''Participant roles''. In: Nick Riemer (Hrsg.): ''The Routledge Handbook of Semantics''. London 2016, S. 403–418.
* Van Valin, Robert (2008) ''Introduction to Syntax.'' Cambridge University Press, Cambridge 2008, ISBN 0-521-63566-7
* Van Valin Jr, R. D. (1977).
Aspects of Lakhota Syntax
'. University of California, Berkeley.

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Thematic roles
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