Fig. 1.  CWPs after median (A –C ) and ulnar nerve (D –F ) stimulation are presented of the UH, AH, and AH block of two patients (A-10 and A-1). The AH block depicts the cortical evoked effects of the block on the affected hemisphere, in the pain-free state. Numbers at various peaks depict the latencies, in A  the first peak is at 22.8 MS, etc . On the y-axis, the amplitude in femtoTesla (fT) is depicted on the x-axis, time in milliseconds (0–400 MS). AH = affected hemisphere; AH-block = affected hemisphere after a local block; CWPs = Compressed waveform profiles; UH = unaffected hemisphere.