When activated by VCN stimulation, CPN2 firing rate is regulated only by Int1 feedback. CPN2 firing rate is plotted against time after only AB feedback was eliminated (filled circles, n = 6), only Int1 feedback was eliminated (open circles, n = 6), or both AB and Int1 feedback were eliminated (filled triangles, n = 6). Eliminating Int1 alone, or Int1 plus AB feedback decreased CPN2 firing rate to the same extent. Eliminating only AB feedback did not alter CPN2 firing rate. ^^P < 0.01, Int1 feedback eliminated; ###P < 0.001, Int1 + AB feedback eliminated; *P < 0.05, ***P < 0.001, feedback eliminated at indicated time after onset.