Fig. 6.
Representative ILM trajectory patterns during swallowing. a Standard monotonous laryngeal elevation activity, b laryngeal activity drops and passes the zero-cross level after reaching the maximal elevation, and c laryngeal activity drops and passes the zero-cross level before reaching the maximal elevation. The duration between the trough T 1 (red dotted line) and the peak M (blue dotted line) is the duration of laryngeal rising time (LRT). The duration between the time point P (at which the laryngeal elevation speed becomes maximal) and the trough T 2 is the duration of laryngeal activation duration (LAD)