The motoneuron membrane potential oscillations during swim/rostral scratch dual stimulation were as regular as those during swim stimulation alone or rostral scratch stimulation alone. (A–C) Dual-referent phase-normalized membrane potential average and the SD (black dots) across all cycles for the cell in Figure 2 with the same stimulation parameters during swim stimulation (A, blue curve), rostral scratch stimulation (B, red curve), and swim/rostral scratch dual stimulation (C, brown curve). (D) Dual-referent phase-normalized membrane potential average of the pooled set of all swim stimulation-alone cycles (from A) and all rostral scratch-stimulation alone cycles (from B) combined for this cell. (E) The mean of the SD within each stimulation paradigm for this cell. Error bars, SD. (F) The mean of the mean SD in (E) across all 10 cells with the same stimulation paradigm. Error bars, SE. a, b, indicate significant differences (identical letters indicate no statistically significant difference; different letters indicate a significant difference) by Friedman’s test followed by Dunn’s test for post hoc pairwise comparisons (Friedman’s test: p = 0.003; Dunn’s test: swim stimulation vs. pooled, p = 0.047; dual stimulation vs. pooled, p = 0.012; other pairs were not significantly different).