Figure 5.
The excitatory effect of 10−5 M octopamine on the rhythmic bursting activity in an in vitro FG + HG preparation. (A) Simultaneous extracellular recordings from an FG and an HG nerve. (B) Recording from a totally isolated FG placed in the same dish. OA application resulted in the generation of high frequency synchronized bursts in the FG + HG preparation, while the spontaneous bursting activity of the isolated FG disappeared. The outlined frame in the left panel in (A) is shown on an extended time scale in the middle panel. FG-HG phase relations can be seen in the red rectified and smoothed signals, which are aligned on top of the unprocessed signal on the extended time scale.