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cSP I/O curve
cSP durations recorded with stimulus intensity increasing in steps of 1 % maximum stimulator output, starting at the intensity where in each individual a first cSP was discernible. At each intensity level, average obtained from 10 healthy subjects. Mean ± SE, data from AP and PA current direction pooled. A, raw cSP duration; B, cSP duration divided by the corresponding peak-to-peak MEP amplitude.
