Figure 4.

Action potentials in both SOM-expressing (RS) and FS interneurons travel into the axon and dendrite with repetitive stimulation. A, Morphology and recording regions of a FS interneuron. Somatic current injections (4 step injections lasting 5 ms at 100 Hz) were used to elicit action potentials. All four action potentials invade both the dendrite and axon. Bottom, Single trials and overlay of the average first and fourth action potentials (2 trial average). Right, Average percentage change in somatic, axonal, and dendritic action potential kinetics between the first and fourth action potential. B, Same as in A, except for SOM (RS) interneurons (average of 2 trials for overlay). *Statistical significance at the level of p < 0.05 (Wilcoxon signed-rank test).