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. Author manuscript; available in PMC: 2015 Aug 7.
Published in final edited form as: Horm Behav. 2014 Aug 7;66(3):552–560. doi: 10.1016/j.yhbeh.2014.07.014

Figure 1.

Figure 1

The functional rewiring of a neural circuit. Biological amines have multifaceted actions on a central pattern generator (CPG) in the crustacean gut. The top row shows the functional circuit of the primary neurons in the crustacean stomatogastric ganglion in control conditions (left; green) and during application of either dopamine (blue), octopamine (purple), or serotonin (orange). The effects of each amine on the functional circuit can be to strengthen or weaken synaptic connections, as indicated by weak interactions (broken circle), moderate interactions (single circle) or strong activity (double circle). For simplicity, neurons that are not known to participate in a given interaction are not depicted, emphasizing the functional rewiring of the circuit. The firing state changes in the waveforms of individual, identified neurons of the network are shown below each circuit for each modulatory state. This figure is adapted from earlier work of Flamm and Harris-Warrick (1986).