Accessibility Hierarchy

Accessibility Hierarchy

In linguistics, Accessibility Hierarchy is a cross-linguistic property that relative clauses are more difficult to process in certain roles:

:Subject > Direct Object > Indirect Object > Oblique > Genitive > Object of comparative

The hierarchy was proposed by Keenan and Comrie (1977). Similar hierarchies have been proposed for Noun Phrases, Pronominal reflexes, etc. Here are some examples of the NP and relative clause usage from English:

Modern grammars may use the accessibility hierarchy to order productions - e.g. in Head-Driven Phrase Structure Grammar the hierarchy corresponds tothe order of elements on the "subcat" list, and interacts with other principlesin explanations of binding facts. The hierarchy also figures in
Lexical Functional Grammar where it is known as SyntacticRank or the Relational Hierarchy.


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