Rhetorical Structure Theory Relations Research Articles

Rhetorical relations in university students’ presentations

The integration into the tertiary curriculum of problem-based learning, and the growing awareness of the need for university graduates to enter the workforce with highly developed communication skills, has led to a greater focus in academic classrooms on oral communication. One aspect of this is the increased use of monologic student oral presentation tasks, a requirement that presents challenges for international and local students alike. There is little research beyond lexical features that centres on the rhetorical level in student presentations. This study attempts to characterise the rhetorical moves within undergraduate oral presentations. The data comprise transcribed presentations by local and international high-scoring students in core first-year undergraduate subjects in three different faculties (n = 30). The methodology for the analysis was Rhetorical Structure Theory (RST). The analysis, which distributed RST relations into those contributing to the presentation's coherence and listener-oriented comprehensibility, identified the range and frequency of rhetorical moves within the dataset. Differences across disciplines appeared to be due to task requirements rather than disciplinary requirements per se. To conclude, we discuss the value of RST in the analysis of oral student data and its potential to inform the preparation of students for formal academic spoken discourse.

Reasoning Between the Lines: a Logic of Relational Propositions

This paper describes how Rhetorical Structure Theory (RST) and relational propositions can be used to define a method for rendering and analyzing texts as expressions in propositional logic. Relational propositions, the implicit assertions that correspond to RST relations, are defined using standard logical operators and rules of inference. The resulting logical forms are used to construct logical expressions that map to RST tree structures. The resulting expressions show that inference is pervasive within coherent texts. To support reasoning over these expressions, a set of rules for negation is defined. The logical forms and their negation rules can be used to examine the flow of reasoning and the effects of incoherence. Because there is a correspondence between logical coherence and the functional relationships of RST, an RST analysis that cannot pass the test of logic is indicative either of a problematic analysis or of an incoherent text. The result is a method for analyzing the logic implicit within discursive reasoning.

Ultrasound reports standardisation using rhetorical structure theory and domain ontology

Ultrasound reporting plays an important role in diagnosis as images produced during an ultrasound examination do not give the whole view of the medical conditions. However, in practice there are many issues that are inherent to ultrasound reporting and the most important was identified to be the lack of standardisation when producing these reports. There is a resistance to change from some radiologists preferring the free writing style, making any attempt to computerise the processing of these reports difficult. This paper explores the possibility of using Rhetorical Structure Theory (RST) together with a domain ontology to transform free-form ultrasound reports into a structured form. It discusses a new approach in segmenting and identifying rhetorical relations that are more applicable to ultrasound reports from classical RST relations. The approach was evaluated on a sample ultrasound reports where the system’s parsing was compared to the manual parsing performed by experts. The results show that discourse parsing using RST in ultrasound reports can be performed effectively using the support of a domain ontology. The results also demonstrate that the transformation of free-form ultrasound reports into a structured form can be performed with the support of RST relations identified and the domain ontology.

Rhetorical relations revisited across distinct levels of discourse unit granularity

In accordance with the compositionality criterion and hierarchy principle of Rhetorical Structure Theory (RST), this study reframes each tree in the RST Discourse Treebank into three new dependency trees with ultimate nodes being clauses, sentences, and paragraphs, respectively, which also draw on an analogy between syntactic and discourse trees. Detailed percentages of various RST relations at the three granularity levels are examined, illuminating the discourse processes of organizing units of one granularity level into those of the next upper level and suggesting certain homogeneity and interaction across levels in the Treebank, particularly at the two upper levels. The study demonstrates the applicability of RST analysis between same-level terminal units. With unique analytical advantages, the newly constructed discourse dependency trees provide new research prospects.

Probability Distribution of Discourse Relations Based on a Chinese RST-annotated Corpus

This article investigates the probability distribution of discourse relations with respect to the categories of the rhetorical structure theory (RST). Twenty texts were randomly extracted from a Chinese RST-style discourse corpus, and the frequency distribution of different discourse relations was investigated. Results show that all the RST relations in all the 20 texts fit perfectly well with a modified right-truncated Zipf-Alekseev distribution. The investigation verifies that at discourse level, linguistic development also follows the diversification process.

Contrast and Concession in French and English

The discourse markers but and although are similar but not identical in meaning. We investigate the relationship between them using data from the INTERSECT translation corpus. A collection of cases are examined where although corresponds to French mais. In order to explain the correspondences we draw on Rhetorical Structure Theory (RST). By organising RST relations in a hierarchy, and adding a new relation to the inventory of RST relations, we can give a systematic explanation of the relationship between contrast and concession.