Figure S1. eACSF induces outward baseline current. Baseline outward current was induced following exchange of ACSF for eACSF. Gramicidin perforated patch recordings in the same experiment as shown in Fig. 3a. The current trace is filtered at 0.2 Hz low-pass.

Figure S2. Oscillatory network activity induced by increased [K+]O in eACSF. Field recordings in CA3 (P4, mouse). GDPs disappeared following exchange of ACSF with eACSF. However, an increase in [K+]O to 5 mM in eACSF caused the re-appearance of GDP-like network oscillations. The voltage trace was filtered at 0.5 Hz high-pass and 20 Hz low-pass.

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