Similarly second unit to third and fourth unit is forming relation 'Condition'. The third unit is the essential part of this relation, so it is called the nucleus of the relation and fourth unit is called the satellite of the relation. The fourth unit and the third unit form a relation 'Means'. In the figure, numbers 1,2,3,4 show the corresponding units as explained above. by applying some tricks that reflect a built-in knowledge of properties of the physical world.When the motion of an intermittently seen object is ambiguous.The original text, broken into numbered units, is: Summary, appearing at the top of an article in Scientific American magazine (Ramachandran and Anstis, 1986).

An analysis is usually built by reading the text and constructing a tree using the relations. RST using rhetorical relations provide a systematic way for an analyst to analyse the text. It is widely accepted that notion of coherence is through text relations like this. Rhetorical relations or coherence relations or discourse relations are paratactic (coordinate) or hypotactic (subordinate) relations that hold across two or more text spans. In 2000, Daniel Marcu, also of ISI, demonstrated that practical discourse parsing and text summarization also could be achieved using RST. It explains coherence by postulating a hierarchical, connected structure of texts. Natural language researchers later began using RST in text summarization and other applications. The theory was developed as part of studies of computer-based text generation. Matthiessen and others at the University of Southern California's Information Sciences Institute (ISI) and defined in a 1988 paper. It was originally developed by William Mann, Sandra Thompson, Christian M.I.M. Rhetorical structure theory ( RST) is a theory of text organization that describes relations that hold between parts of text.

Coherence examples rhetoric