a, Injection of 5 μM DAMGO into PiCo eliminates
the phase delay elicited by photostimulation of PiCo in
Chat-cre;Ai27 mice. A representative experiment showing
cVN and XII recordings during a 200 ms light pulse before and after
injection of PiCo with DAMGO (left; gray bars = expected phase,
purple bars = inspiratory phase delay) and the average inspiratory
phase delay (right) (mean ± s.e.m., two-tailed paired t-test,
**P<0.01; n=6). b, A diversity of
postinspiratory vagal waveforms were recorded in vivo. Five examples of cVN
(black) and XII (purple) recordings (overlaid) show that postinspiratory
activity can vary from large decrementing patterns to small short bursts,
potentially representing the neural basis for a variety of postinspiratory
behaviors.