Figure 7.

Comparison of C. morosus, mouse, cat, human, and horse (horse data are the mean of the activities observed during walk, trot, and cantor) swing motor neuron activity. C. morosus, mouse, and cat swing motor neurons are active throughout swing, human and horse swing motor neurons are active only at swing beginning. See Results for discussion of stance phase activities. For the horse data, the rectangles show only when swing motor neurons are active, not the amplitude of the activity; for the other traces, the varying heights of the traces show how the activity's amplitude varied in the step cycle. Cat, human, and horse data modified from Prochazka et al. (1989) and Tokuriki and Aoki (1995). Error bars on C. morosus and mouse data are SDs.