Figure 7.

Contour plots based on the formant deflections determined with Eqn. 3 for all twenty time-varying area functions in the [ɑCi] set, and associated identification functions from the listening experiment. The middle and upper panels correspond to ΔF2, and ΔF3, respectively. The x-axis of each plot represents the portion of the vocal tract length within which constrictions were imposed to generate the set of VCVs. The y-axis in each plot is time, where zero seconds represents the point of vocal tract closure and release. Negative and positive time correspond to the constriction onset and offset periods, respectively. Like colors within each plot are contours where the formant deflections are constant. The solid vertical lines indicate phonetic boundaries defined by the 50 percent crossover points on the ID curves. The dashed lines are alternative boundaries discussed in the text.