Experimental procedure Steps 5 and 6: Recording data (Spike recordings).

<p><b>A)</b> Snapshot of a 500 Hz high-pass filtered MC_Rack display. Spiking activity with good signal-to-noise is visible on many electrodes. <b>B)</b> Snapshot of MC_Rack display after overflow. Noise with amplitudes of 200 to over 1000 µV due to wet electronics is visible on most electrodes. <b>C)</b> Snapshot of MC_Rack display several hours after strong overflow. Slow noise on many electrodes is visible either if the electronics is not fully dry yet or when the electronics has been irreversibly harmed. <b>D)</b> Snapshot with slow fluctuations and spike-like noise peaks (red asterisks). See text (Step 5 and 6, troubleshooting) for details.