Figure 1.

Membrane depolarization induces conditional rhythmical burst discharge in Mes V neurons. A, Maintained current injection induces rhythmical burst discharge in Mes V neuron. The top trace shows voltage response, and the bottom trace shows current injection. The dotted line in the voltage trace indicates the resting membrane potential (−62 mV). B, Traces taken from the boxed region in A on an expanded time and voltage scale. C, Instantaneous spike frequency–time relationship for the burst shown in B. D, Histogram of spike frequency within a burst (n = 84 neurons). The mean spike frequency within a burst was obtained from the second burst in a series at threshold stimulus in response to depolarizing current injection.