Figure 3.

Tonic inhibition recorded in Cs₂SO₄-based intracellular solution is unaffected by TTX or Ca²⁺-free solutions. A, When holding at 0 mV in the presence of applied TTX (1 μm), this SPN was depolarized by 100 μm bicuculline. B, Trace from the same neuron showing that the bicuculline response was maintained after addition of Cd²⁺ or (C) in Ca²⁺-free extracellular solution.