Here we manipulate the physical parameters that describe the decay of bronchial pressure and muscle tension in the physical model of the syringeal and bronchial apparatus (Eq 4).

The model results to be robust to variation of τ, since there are no major changes in most of the range used (20 to 60 ms). This supports the idea that the labial response is driven mainly by the neural pathway and weakly influenced by the physical properties of the syringeal system. Experimental settings: C = 0.4, neurons number = 20, INLVL = 0; I current = 10mA, τp = τt for simplicity.