Figure 11.

Circuit schema resulting from this work. Although multiple excitatory inputs converge onto neuron B31/B32 in the protraction-phase feeding circuitry of Aplysia, these inputs are not equivalent. Only the input from B63 (black) elicits a PIR-sensitive slow EPSP in B31/B32 and is critical for induction of the plateau potential and motor programs. Other inputs elicit PIR-insensitive slow EPSPs (gray). The input from CBI-2 is weak (Hurwitz et al., 2003), and its slow EPSP has not been tested. The zig-zagged line represents electrical coupling between B63 and B31/B32.