Fig. 3. Positive relationship between the frequency of spikes in the lateral nerve and the extent of distortion of a semi-lunar process during the co-contraction phase of kicking. (A) Plots of the correlation for 4 individual kicks. In kicks 1 and 2, the spike frequencies appear to decrease at the end of the co-contraction period due to the apparent synchronization of the sensory spikes in the extracellular recording at high frequencies. (B) Pooled data from 10 kicks by 3 locusts showing a positive relationship between the frequency of sensory spikes in the lateral nerve during co-contraction and the distortion of a semi-lunar process.