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Linguistic Simplification in Human-Computer Interaction: Implications for theCognitive Foundations of Language

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Abstract

How can a range of syntactic variation within a language be explained, particularly when linguistic expressions producedby native speakers in one context clearly violate syntactic norms? To answer this question, we investigate the properties ofinformation requests that arise in the context of human-computer interaction, such as ’most home runs player 1975 age’.The results of a production study that compares the structural complexity of information requests in human-computervs. human-human condition show that participants in the former condition tend to use simpler syntactic structures andfewer relative clauses, compared to that in the human-human condition, despite syntactic priming. Our results suggestthat speakers in the human-computer context utilize a qualitatively different type of formal grammar, linear grammar(Jackendoff & Wittenberg, 2017) as opposed to hierarchical grammar. The study contributes to the theoretical discussionon what constitutes a lower bound on complexity in language (cf. Futrell et al., 2016).

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