Fig. 4.

Simulated responses to interrupted calls. A: a short interruption (long interval) in an 8-pulse call (top, each tick corresponds to an excitatory event in the main afferent) causes a spike in LIN (blue) which hyperpolarizes the ICN after the pulses resume, resetting its counting process (black, bottom). Call is made of short intervals (IPI = 10 ms) and a longer middle interval (MIPI = 20 ms). Inhibition is seen after the fifth excitatory event (black arrow). B: for longer silent gaps (MIPI = 35 ms), LIN now fires a rebound spike before the fifth pulse arrives. Accordingly, inhibition in the ICN is seen before the fifth excitatory event (black arrow). Parameter values are shown in Table 1.