Abstract
The activity of vestibulospinal neurons giving axons to the lumbosacral spinal cord was recorded during locomotion (walking and running on the treadmill) in mesencephalic and thalamic cats. The overall activity of most neurons increases to a considerable degree during locomotion, and periodic alternations of this activity in relation to the locomotor cycle (modulation) were observed in cats with intact cerebellum. The peak discharge usually occurs at the beginning of the stance phase of the ipsilateral hindlimb, i.e., when the extensor muscles are activated. Phasic modulation disappears when the limbs are stopped by force. There is no modulation in decerebellate cats.
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