A method for estimating lingual cavity volume in click consonants

A method for estimating lingual cavity volume in click consonants is presented. The upper edge of the lingual cavity is estimated from stone palate casts, which were scanned using a Polhemus 3D Digitizer. The floor of the midline of the lingual cavity was estimated using 114 fps mid-sagittal ultrasound traces of the tongue collected with the CHAUSA method (Miller and Finch 2011). The width of the cavity from front to back was estimated by measurements of the cavity width at six different locations in linguograms. Changes in lingual cavity volume for the four coronal click types in Mangetti Dune !Xung are estimated by changing the mid-sagitttal ultrasound trace that corresponds to one of five stages in click production. 3-D images of the changes in cavity volume for each of the four coronal click types recognized by the IPA (2006) are presented.