Fig. 2.

Individual muscles show large differences in force production in response to identical motor neuron stimulation. Isometric contractions of extensor muscles from nine different animals (muscles A–I here) induced by stimulation with a pulse train delivered with the same spike pattern as that previously (Hooper et al. 2006) recorded during a single stick insect sideways step. For a discussion on the variability of extensor muscle data, see Guschlbauer et al. (2007) and Hooper et al. (2006, 2007)