Fig. 7. Ramp-and-hold stimulation of the femoral chordotonal organ (fCO); motoneuron discharge. (A) Sample recordings from the three relevant species: Prosarthria teretrirostris (top; stimulus amplitude 350 µm, corresponding to approximately 40°), Carausius morosus (middle, 200 µm, approximately 40°) and Schistocerca gregaria (bottom, 240 µm, approximately 40°). CI, common inhibitor neuron. (B) Position-sensitive portion of the motoneuron response, P (for a definition of P, see in the inset in C and the text) plotted versus femur–tibia angle. Prosarthria teretrirostris, circles (N=6); Schistocerca gregaria, triangles (N=5); means ± S.D. The data do not differ significantly between species. (C) Velocity-sensitive portion of the response, V (for a definition of V, see the inset and the text) plotted versus stimulus velocity. Prosarthria teretrirostris, circles (N=6, n=3 stimuli per animal); Carausius morosus, squares (N=5, n=3); Schistocerca gregaria, triangles (N=7, n=3); means ± S.D. A regression line (not shown) through data points for Schistocerca gregaria has a slope not significantly different from zero.
