Figure 3.

Dual-referent phase-averaged membrane potentials with respect to the ipsilateral hip flexor nerve bursts and interburst intervals during ipsilateral fictive scratching, for four of the cells shown in Figures 1 and 2. Arrows indicate the phase of maximal hyperpolarization in each cell, which could occur during the ipsilateral hip flexor bursts. Cycle periods of all analyzed cycles were 3.17 ± 0.69 s (mean ± SD) for ipsilateral rostral scratching, 2.44 ± 0.99 s for ipsilateral pocket scratching, and 3.54 ± 1.50 s for ipsilateral caudal scratching.