Figure 2

Firing patterns of the vertical cells from the CTb injected animals. In each case, the lower traces indicate square wave depolarising current pulses and the upper traces show the response of the cell. Figures to the left show the initial membrane voltage and current before the application of the pulses. a, shows traces from the neuron defined as reluctant (cell 8 in Table 1). Note that although the cell does not fire action potentials in response to depolarising current injection, it does show spontaneous EPSPs (two indicated with arrowheads). b, c, show traces from the two neurons with delayed firing patterns (cells 9 and 10, respectively, in Table 1). The arrowhead indicates the small delay in c.