Fig. 4. IV neuron activity in the isolated STNS. (A) Multisweep recordings (n=39) of ivn high and low, son, stn and ion, triggered on the IV action potential on ivn high during rhythmic IV activity. The IV neuron action potential was observed in all nerves, except the ion. Action potentials on the stn are truncated. (B) Box plots (minimum, lower quartile, median, upper quartile, maximum) of period, burst duration and mean intraburst spike frequency of rhythmic IV activity in the isolated STNS. The square gives the mean. (C) Extracellular recordings of lgn and ivn in vitro during rhythmic IV activity (bottom two traces). With every IV burst, its spike frequency exceeding more than 30 Hz, a LG neuron burst occurred (sliding average with a bin width of 1 s). IV neuron bursts and LG neuron bursts were time locked.