Abstract
Using the Wisconsin X-ray microbeam corpus, this paper explores the relationship between palate shape in the saggital plane and articulatory variation. The corpus has been updated with tags (Praat Textgrids) marking the acoustic onsets and offsets of words and phones. In addition, the sound files have been translated to WAV format, and the articulatory data saved as plain text files. The shape of the palate for each of 57 speakers of American English was measured in terms of the total 2D area of the palate vault above the occlusal plane. Articulatory variability was measured in terms of the interquartile ranges of the x and y locations of 7 pellets attached to the tongue (4 pellets), lips (upper and lower), and jaw. Although there is a significant correlation between palate area and the range of motion of some articulators (particularly on the body of the tongue, but surprisingly to this author, not the motion of the jaw), the study also finds that there is a great deal of variation among speakers. Articulatory motions involved in particular speech sounds will also be examined to determine if there are specific patterns of variation associated with the palate size.
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