ABSTRACT
A prevailing view in motor physiology for the past two decades has been that the timing of repetitive motor activity is established by central neuronal circuits. Recent studies on a number of locomotory systems have questioned this view. In some of these systems, it has been found that proprioceptive input establishes the timing of certain aspects of the motor pattern and is used in the generation of the rhythm. A basic problem is to determine how proprioceptive information is integrated into the central rhythmic networks for each of these systems. This problem has been analyzed in most detail in the flight system of the locust. The main results of this analysis are described in this chapter.
