Figure 5.
a. The first principal component of variance for one subject repeated swallows task accounts for 81.5% of the shape change variance
b. Plotted morphologies of one subject repeated swallows task. A scatter plot of PC scores (deviations of the grand mean) for each frame of swallowing coded by phase of swallowing shows that principal component 1 is largely defined by hyolaryngeal excursion. This scatter plot shows oral phase 1 and 2 at one end of the spectrum and pharyngeal phase 1 at the other indicating that these phases represent the extremes of hyolaryngeal excursion.
c. Eigenvectors of one subject repeated swallows task confirms two muscular slings underlie hyolaryngeal elevation