Figure 1.

Reconstructions of vSUB neurons and their spike-firing properties. A, B, Regular spiking (A) and intrinsically burst-spiking neurons (B) and their respective traces. A₁ (RS neuron) and B₁ (BS neuron) show whole-cell current-clamp recordings in response to a long (600 msec) step pulse current injection of 250 pA. A₂ (RS neuron) and B₂ (BS neuron) show whole-cell current-clamp recordings in response to brief sEPSC (0.2 rise tau, 6 msec decay tau) of 1500 pA (A₂) or 950 pA (B₂). A₃ shows the RS neuron induced to burst by a larger sEPSC (2000 pA). The two cells depicted and their recorded traces were chosen randomly from the RS and BS groups. Previous quantitative analyses by our laboratory have shown no morphological differences between the dendritic arborization in RS and BS neurons (Staff et al., 2000).