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Responses of a bundle of axons to high-frequency stimulation (HFS). (A) Sequences of action potentials generated by 130 Hz HFS (0.2 mA) in 11 axons with different distances to the point source of stimulation. Axonal responses to the last seven pulses at the end of 2-s HFS are expanded at right. (B) Changes of induction ratios of action potentials for the six axons with distances of 20, 40, 60, 80, 100, and 120 μm to the stimulation source during HFS.
