AUTHOR=Best Catherine T. TITLE=The Diversity of Tone Languages and the Roles of Pitch Variation in Non-tone Languages: Considerations for Tone Perception Research JOURNAL=Frontiers in Psychology VOLUME=10 YEAR=2019 URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2019.00364 DOI=10.3389/fpsyg.2019.00364 ISSN=1664-1078