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. 2009 Jan 14;29(2):476–482. doi: 10.1523/JNEUROSCI.4117-08.2009

Figure 4.

Figure 4.

Responses of M1 and M2 cells to depolarizing current pulses. Recordings were performed in the presence of synaptic blockers. A, B, Representative response of M1 (A) and M2 (B) cells to 1 s depolarizing current injection. Values to the right of the current steps indicate maximum current injection shown. C, Instantaneous frequency of the first interspike interval for M1 cell in A (gray) and M2 cell in B (black). D, Average firing rate for duration of 1 s depolarizing steps for M1 cell in A (gray) and M2 cell in B (black). E, Instantaneous frequency over time for M1 cell in A. F, Instantaneous frequency over time for M2 cell in B. G, Mean ± SE instantaneous frequency of the first interspike interval (circles) and mean ± SE firing rate (squares) during current injection for M1 (gray, n = 15) and M2 (black, n = 12) cells. Current injection for each cell was divided by its capacitance (bin = 0.5 pA/pF) to facilitate averaging.