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. Author manuscript; available in PMC: 2013 Jan 4.
Published in final edited form as: J Neurosci. 2012 Jul 4;32(27):9182–9193. doi: 10.1523/JNEUROSCI.1461-12.2012

Figure 9.

Figure 9

POC stimulation triggers a specific version of the gastric mill rhythm via postsynaptic activation of MCN1 and CPN2 and presynaptic modulation of the AB feedback synapse to these projection neurons. A, Before POC stimulation, AB inhibition of MCN1 and CPN2 is weak, plus the projection neurons and LG are weakly active or silent and there is no gastric mill rhythm (black circles). B, POC stimulation triggers a long-lasting activation of MCN1 and CPN2 (red) that includes a pyloric rhythm-timed activity pattern due to a long-lasting strengthening of the AB inhibition of these projection neurons (red) without a change in AB activity (green). Note that there is not a concomitant strengthening of AB inhibition within the STG (green). The pre- and post-synaptic POC actions on MCN1 and CPN2 are both necessary for the POC version of the gastric mill rhythm, which is characterized by pyloric-timed activity patterns in the projection neurons and the protraction neuron LG (red stripes). The dotted line indicates spatial separation of the CoGs from the STG.