Figure 2.

In vivo signals initiate sequential spikes preferentially at the soma of cortical pyramidal cells. A) An in vivo pulse (black trace at bottom, >1000 ms) evokes more spikes at the soma (red trace) than at axon (blue) in dual recording (inset). B) shows spike number vs. normalized pulses in vivo at the soma (triangle symbols) and axon (circles; n = 19; asterisks, p < 0.05). C) illustrates input-output curves for the soma (red symbols) and different axonal fragments in 10~30 μm (blue) and >30 μm (green) away from the soma.