Zipf's law in aphasia across languages: A comparison of English, Hungarian and Greek

We investigated Zipf’s law in fluent and non-fluent aphasics’ spontaneous speech in English, Hungarian, and Greek. A previous study showed that the word frequency distribution in Dutch non-fluent aphasic speech conforms to Zipf’s law, although with a different slope. In this project we investigated to what extent these results can be generalized to other languages and to fluent aphasic speech. The results suggest that both the fluent and the non-fluent aphasic speech of English, Hungarian and Greek conform to Zipf’s law, and that differences in slope can be related to a language’s morphological properties and a group’s particular language impairments.