Fig. 3. Cross-excitation of the non-bombykal cell occurred in response to a subset of the 10 µg bombykal (BAL) stimuli of 50 ms duration (see Table 2). While in (A) BAL stimuli elicited only large action potentials, in (B) small action potentials were also elicited at a lower frequency and after a longer latency. Responses of small action potentials were not elicited at BAL doses below 10 µg. The terms `large' and `small' action potentials refer to the amplitude of the first action potential of each class, before the stimulus-correlated amplitude reduction took place. AC: pseudo-highpass-filtered traces, obtained by subtracting lowpass-filtered responses (50 Hz Gaussian filter) from the original signals (DC).