Figure 3.

Quantitative analysis reveals Type 1 and Type 2 GABA neurons to require different levels of hyperpolarization to elicit a rebound action potential. A representative partial current injection protocol, shown in (A), illustrates differences in Type 1 (blue) and Type 2 GABA neurons (green) **p = .0058. As shown in graph (B), Type 2 neurons generally require a more hyperpolarized membrane potential to elicit a post-hyperpolarization “rebound” action potential. In (C) we show the presence of a voltage sag indicative of an Ih current at low potential in Type 1 neurons. A population analysis of all 3 GABA neuron classes reveals heterogeneity in Ih presence among the populations, although Type 2 neurons almost ubiquitously exhibited an Ih current (D). It is of note that while resting membrane potential was even between groups (E), Type 3 neurons had a slightly smaller average input resistance than Type 2 neurons, as shown graphically in *p = .0119 for graph (F).