Fig. 3
From: Effects of chiropractic spinal manipulation on laser-evoked pain and brain activity
Pain modulation. Mean pain ratings before and after the intervention for the four groups. SM at T4 (segmental) produced pain inhibition compared with no intervention or the placebo intervention. SM at T8 produced similar effects but they were not statistically significant compared with no intervention or the placebo intervention. Data from each participant are represented by linked colored dots and the mean of these data points for each condition are represented by black and grey bars. *P < 0.05