Thematic role properties of subjects and objects

Area of Science:

• Psycholinguistics
• Cognitive Science
• Linguistics

Background:

• Thematic roles, such as Agent and Patient, are fundamental to sentence meaning.
• Dowty's (1991) Proto-Roles Hypothesis proposes these roles are decomposable into primitive features.
• The relationship between grammatical roles (subject, object) and thematic roles is a key area of linguistic inquiry.

Purpose of the Study:

• To test if Agent and Patient roles can be decomposed into primitive features (Proto-Roles Hypothesis).
• To investigate if these proto-role properties can be directly inferred from grammatical roles (subject and object).
• To examine how novel verbs and intransitive verbs in transitive frames affect these inferences.

Main Methods:

• Five experiments were conducted using participant ratings of transitive sentences.
• Sentences featured real verbs, nonsense content words, and intransitive verbs in transitive frames.
• Participants assessed proto-role properties of subjects and objects, and grammatically irrelevant properties.

Main Results:

• Subjects were consistently rated as more Agent-like, and objects as more Patient-like.
• These findings held true even when using nonsense verbs, indicating reliance on grammatical structure.
• Grammatically irrelevant properties did not differ between subjects and objects, supporting the specificity of the thematic role inferences.

Conclusions:

• Grammatical roles of subject and object directly correlate with Agent and Patient proto-role properties.
• The Proto-Roles Hypothesis is supported, as these inferences are made even with novel semantic content.
• Linguistic frames can influence verb semantics, suggesting a dynamic interplay between syntax and semantics in language processing.