Figure 2

Mechanical stimulation of the trachea (stim) with short reflex expiration (ERt) during the inspiratory period of breathing. The stimulation immediately terminated an inspiration (rapid suppression of PCA and PS) and induced the ERt (abrupt activation of ThAr, PCA and ABD). Two much weaker ERt were detectable in the record of ABD, before the initial cough inspiration began (activation of PCA at the end of the record). See Fig. 1 for abbreviations.