Abstract
The reported results demonstrate that monoamines modulate activity of three populations of spinocerebellar tract neurons that are rhythmically active during locomotion. However, information on dynamic changes in muscle length and tension (signaled by muscle spindle primary afferents and tendon organs) and on the absolute length of muscles (signaled by muscle spindle secondary afferents) is differently modulated. The transfer of the former is facilitated but that of the latter is either facilitated or depressed; it is facilitated via Clarke's column dorsal spinocerebellar tract neurons and depressed via dorsal horn dorsal spinocerebellar tract neurons. The effects of noradrenaline and serotonin are similar.
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