Fig. 3.

Strength of stimulation of FETi influenced the offset of the resting angle. The data for all stimuli were pooled across all animals; sample sizes are as given in Fig. 2. Negative values indicate more extended angles. The boxes indicate the quartiles; filled circles show the mean offset; whiskers indicate 10% and 90% intervals; and crosses indicate minimum and maximum values. The offset increased with the number of pulses applied, as shown by the difference between the offset after single-pulse stimulation and the other 2 stimulus types, in which 5 spikes were elicited in the FETi motor neuron. The offset also increased with increasing stimulus frequency, which manifests in the difference in offset after 7.5- and 20-Hz stimulation. These effects were significant (1-way repeated-measures ANOVA, P = 4 × 10⁻⁷, Tukey's test: all P values <0.002).