Fig. 6.

Lack of strong burst firing in young neurons. Examples of voltage recordings obtained at the break of hyperpolarizing current steps in P1 and P2 neurons (same neurons for which tonic firing is shown in Fig. 3). The durations of the current steps were 700 and 1000 msec for the P1 and P2 neurons, respectively. Note how by increasing the size of the preceding hyperpolarizing pulse the amplitude of the second and third action potentials in the burst is markedly reduced. Horizontal dashed lines indicate 0 mV.