Abstract
The activity of rubrospinal neurons giving axons to the lumbosacral spinal cord was recorded during locomotion (walking and running on the treadmill) in thalamic cats. The overall activity of most neurons increased to a considerable degree during locomotion, and strong periodic alternations of this activity in relation to the locomotor cycle (modulation) were observed in cats with intact cerebellum. The peak discharge usually occurred during the swing phase of the contralateral hindlimb, i.e. during the activity of the flexor muscles. Phasic modulation disappeared when the limbs were stopped by force. There was no modulation in decerebellate cats.
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