Recent studies have found evidence of tone change in progress among Thai speakers. In particular, changes in the high tone, traditionally considered a level tone, have caused some to suggest it should instead be considered a contour tone (Zsiga, 2008; Teeranon and Rungrojsuwan, 2009). However, the previous research has focused primarily on the Central Thai dialect found in Bangkok, the standard dialect of Thai. This study examines the current state of tones in the Northern Thai dialect of Chiang Mai, which has six contrastive tones, rather than the five found in Central Thai. This data allows for a comparison to both the Central Thai literature as well as previous studies of Northern Thai, to examine whether Northern Thai is undergoing tone change as well and whether it exhibits similar changes to those reported for Central Thai. Significant exposure to Central Thai via mass media as well as the education system, and widespread bi-dialectalism, may carry the influences of Central Thai tone changes into Northern Thai as well. This study aims to provide further insight into the ongoing changes in the Thai tonal space, in order to clarify the nature of Thai tones today.
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