Fig. 4.  (A ) Four GFP curves of patient A-8 after four different measurements are presented. The UH curve (blue), AH in pain (red), AH first block without pain but unpleasant cold hand (green), and AH-pain free after second block without pain (black) are depicted in a 250-ms (MS) time window; vertical is the power in fT²(femtoTesla²). Major power changes for patient A-8 are observed in the early (M30) and middle stage (M70). AH = affected hemisphere; AH-1st block = affected hemisphere after 1st local block; AH-pain free = affected hemisphere after 2nd local block; GFP = global field power; UH MED = unaffected hemisphere response after median nerve stimulation. The ECD localizations at M30 (B ) and M70 (C ) of patient A-8 are presented in the UH, AH, and AH after the first and second anesthetic block. The M30 and M70 dipoles in the UH are depicted in blue, in the AH in red. The green AH dipole depicts the dipole after the first block, minimal pain but still with an unpleasant cold hand. Yellow depicts the dipole localization after the second block. The nose is depicted in white and marks the + x axis. AH = affected hemisphere; AH-1st block = affected hemisphere after a first local block; AH pain free after second block; ECD = equivalent current dipole; L = left; M30 = ECD at 30 ms; M70 the ECD at 70 ms; R = right; UH = unaffected hemisphere.