Fig. 6. Effect of pymetrozine on individual femoral chordotonal organ (fCO) receptor cells. (A) Sample recording from the soma of an fCO receptor cell (distal scoloparium) in the middle leg (i) before and (ii) after 10^–5 mol l^–1 pymetrozine application. Stimulus shown in bottom trace (amplitude 240 µm, 40°). Note response of this receptor cell to the elongation phase of the ramp-and-hold stimulus, mimicking flexion of the femur–tibia joint. Scale bar, 5 s. (B) PST histograms constructed from the recording depicted in A, as described for Fig. 4. Broken line in A marks the threshold used for spike selection in the construction of the time histograms in B.