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Schematic representation of experimental arrangement for data collection and examples of stimulation trains used in the study. The top stimulation train is a 20-HZ doublet-frequency train (DFT) that contains pairs of doublets (two pulses separated by 5 ms) separated by 95-ms interdoublet intervals. The bottom stimulation train is a 20-HZ constant-frequency train (CFT) that contains pulses separated by 50-ms intervals.
