Slide 11

Figure 11. Phase plot of the somatic spike after reducing axonal gNa+ to 0. Note that there is no longer any "kink" in the somatic recording and that the spike is no longer biphasic, revealing that these two features are mediated by spike initiation in the axon. A noisy conductance was injected into the soma. Note that the variation in the spike threshold in the axon and soma are now approximately equal.