Figure 2.

Histogram of swallow initiation and termination within the cough phases during the aspiration protocol. The occurrence and termination of swallows were plotted across cough phases that were segmented into quartiles. Swallows were executed primarily in the E2 cough phase. The solid line is swallow initiation as demarked by elevation of the hyoid and relaxation of the upper esophageal sphincter, and swallow termination was identified by increased tone to the upper esophageal sphincter following relaxation. There is one occurrence of a swallow being initiated during the E1 phase and four occurrences swallows being completed during the I phase of the subsequent cough (n=73 swallows from 17 animals).