Figure 9. Inspiratory neurones excited by inflation.

Ai, baseline activity. Aii, burst-triggered baseline average activity (n= 8 control cycles); reveals preinspiratory inhibition (arrow) similar to type III neurones. Bi, delayed excitation consistent with an I_A-like current (arrow) was elicited by step depolarization to −30 mV from −80 mV. Bii, sag-rebound response consistent with an I_h-like current was obtained by application of step hyperpolarization to −110 mV from resting mid-expiratory membrane potential (arrow). C, neurones fired briskly during inflation (shaded bar).