Fig. 4From: Effects of chiropractic spinal manipulation on laser-evoked pain and brain activityAδ-fiber laser-evoked potentials. a Average waveforms time-locked to the onset of laser stimulation for the N2 and P2 at Cz with a nose reference, for the 60 participants included in the analysis. b Average topographic maps for the Aδ-N2 (200 ms) and Aδ-P2 (365 ms). No significant effect was observed between groupsBack to article page