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Induction of persistent firing with short current injection. Persistent firing recorded in one cell with 2 s (a) and 200 ms (b) current injection. Persistent firing recorded in another cell with 2 s (c) and 200 ms (d) current injection. Note that frequency of persistent firing was different between these two cells but was similar in the two stimulation protocols for each cell. e, Frequency of persistent firing of individual cells with 2 s and 200 ms current injections.
