Published online by Cambridge University Press: 28 April 2020
Substance-based phonological theories predict that a preference for phonetically natural rules (those which reflect constraints on speech production and perception) is encoded in synchronic grammars, and translates into learning biases. Some previous work has shown evidence for such biases, but methodological concerns with these studies mean that the question warrants further investigation. We revisit this issue by focusing on the learning of palatal vowel harmony (phonetically natural) compared to disharmony (phonetically unnatural). In addition, we investigate the role of memory consolidation during sleep on rule learning. We use an artificial language learning paradigm with two test phases separated by twelve hours. We observe a robust effect of phonetic naturalness: vowel harmony is learned better than vowel disharmony. For both rules, performance remains stable after twelve hours, regardless of the presence or absence of sleep.
This work was supported by grants from the Agence Nationale de la Recherche (ANR-17-CE28-0007-01 and ANR-17-EURE-0017). We would like to thank Michel Dutat for setting up the server from which the experiment was run, and Page Piccinini for launching a number of the sleep batches. We would additionally like to thank three anonymous reviewers and the associate editor, all of whom helped us to considerably strengthen the paper.