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Shapes of action potentials (APs) of the recorded neurons. Each panel shows how AP durations D1, D2, D3, and D4 were measured using the average traces of extracellularly recorded APs. A: the “short” biphasic AP. B: the “long” biphasic AP. C: the “LC-like” AP with a “notch” occurring after the spike characteristic for LC cells. D: the triphasic action potentials. LC, locus coeruleus.
