Fig. 4. Findings of timing difference variables according to liquid viscosity in normal subjects. LEC, latency of epiglottis contact; LLE, latency of laryngeal elevation; LPC, latency of pharyngeal constriction; LUEO, latency of upper esophageal sphincter opening; LPLE, latency of peak laryngeal elevation; LPPC, latency of peak pharyngeal constriction; PTT, pharyngeal transit time; DLE, duration of laryngeal elevation; DUEO, duration of upper esophageal sphincter opening.