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. 2009 Oct 7;29(40):12641–12652. doi: 10.1523/JNEUROSCI.1124-09.2009

Figure 4.

Figure 4.

Action potential backpropagation. A, Left, Reconstruction of a PC pyramidal cell with the locations of somatic and dendritic (d S-D = 195 μm from soma) recordings. Right, Spike trains elicited by step current injections recorded at the somatic and dendritic locations. The inset shows a magnification of the spike enclosed in the dashed rectangle. B, Same as A (top) for a distal dendritic (d S-D = 470 μm from soma) recording and step current at the soma. Note the variability of backpropagating spike amplitude in the dendritic recording. C, Backpropagating spike amplitude in the dendrite as function of somatic distance: circles, maximum AP amplitude in the train; squares, first spike of a train. Recordings in semilunar cells are shown with empty markers. D, Ratio of backpropagating spike amplitude to somatic spike amplitude: circles, maximum in each train; squares, first spike of a train. E, Coefficient of variation of backpropagating spike amplitude computed over all recorded spikes in a cell. F, Half-width of the backpropagating spike (average and SD). G, Peak-to-peak delay between somatic and backpropagating dendritic spikes (average and SD).