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Soma-spike components. A stimulus pulse delivered to the 20th peripheral node (5 nA, 0.2 ms) evoked a full S-spike in the soma. Reducing pNamax+ in the soma and initial segment from 8 × 10−5 to 4 × 10−5 cm/s led to failure of spike invasion, leaving only an NM-spike residue. Note the inflection on the rising phase of the S-spike (arrow) which illustrates the NM component of the S-spike.
