FIGURE 2.

During dual stimulation, this HF motoneuron’s membrane potential still oscillated regularly. (A–C) Extracellular recordings from limb nerves (top three traces; AM-KE, ambiens knee extensor; HF, hip flexor; HE, hip extensor) and the intracellular recording of the motoneuron shown in Figure 1 (HF MN, fourth trace). (A) Recordings during swim stimulation [current pulses at 25 Hz; blue bar indicates the stimulation period (Stim.)]. (B) Recordings during rostral scratch stimulation (red bar). (C) When swim/rostral scratch dual stimulation (blue and red bars) evoked a motor pattern with a higher cycle frequency (shaded area), the membrane potential of the HF motoneuron oscillated regularly at the same rate as the motor pattern.