THE PHONOLOGY OF MIXTECO'S FLOATING HIGH TONES: THEORETICAL IMPLICATIONS BERNARD TRANEL University of California, Irvine <
[email protected]> 1. INTRODUCTION This paper provides a cross-theoretical comparison of the treatment of floating high tones in Mixteco, a language of Southern Mexico studied by Kenneth Pike in the 1930's and 40's. Such a case study proves instructive in three major ways. First, it justifies the recent theoretical trend to move away from rule-based phonology to constraint-based phonology. Secondly, it raises interesting theoretical issues within the nascent constraint-based approach. Finally, it brings about new perspectives on our understanding of tonal phonology and the morphology of floating elements. In a nutshell, the facts of relevance in Mixteco are the following: a morpheme-final floating high tone anchors into the next morpheme (if no pause intervenes), but its landing site varies depending on the host morpheme's own tonal and segmental make-up. Thus, the floating tone does not automatically dock onto the first tone-bearing element of its host, as one might expect in such tone sandhi configurations. Instead, it prefers to attach to the first low-tone or high-tone vowel, even if it requires skipping an intervening mid-tone vowel. This preference can however be thwarted in some cases. For example, a medial glottal stop in effect prevents a floating high tone from ignoring an initial mid-tone vowel in favor of a subsequent low-tone or high-tone vowel. Another important characteristic of floating high tones in Mixteco is that they are never phonetically realized within their own lexical morphemes.