Fig. 7.

Decreasing the extracellular Na⁺ concentration inhibits chattering.A, In normal bathing solution, intracellular injection of a depolarizing pulse results in repetitive doublets of action potentials and spike afterdepolarizations. B, Twenty minutes after replacement of NaCl with CholineCl, the repetitive doublets and the initial burst of action potentials are suppressed.C, Overlay of the action potentials before and during wash in low Na⁺ reveals that the low Na⁺ solution suppressed the spike ADP.