Figure 7.

Extracellular recording showing the effect of somatic stimulation on the activity of expiratory (post-I and E2) neurons in the VRG complex. A, Simultaneous recording of post-I and E2 neurons. Somatic stimulation reduced respiratory period duration (2.5 vs 1.9 s) and altered post-I and E2 neuron activity. B, Stimulation abruptly reduced the duration of post-I discharge and increased E2 discharge rate. The dot represents a stimulus artifact. C, Summary data showing the effects of somatic stimulation on post-I and E2 neuron activity. ^*p < 0.05, significantly different from prestimulation.