Fictive locomotion can be induced in shams and trained cats. a, b, Motoneuronal intracellular potential and ENG activity in flexor and extensor muscle nerves in a sham (a) and a trained (b) cat. Rhythmic bursts of activity evoked by perineal stimulation before clonidine injection were observed in trained cats (7 of 11) and in shams (2 of 7). c,d, After clonidine, perineal stimulation induced robust locomotor episodes in both groups of cats. Ext Mn, Extensor motoneuron.