Figure 4

Comparison of ESCC effects in three groups based on electrodes location. Blue—electrodes implanted over motor and premotor cortex (n = 6); Brown—electrodes implanted over premotor and prefrontal cortex (n = 2); Green—electrodes implanted over sensory, motor, and premotor cortex (n = 1). PO—preoperative pain level (NRS); TSS (trial stimulation start)—pain level when trial stimulation was started; TSE (trial stimulation end)—pain level by the end of trial stimulation; PI1 (post-implantation 1)—permanent grid post-implantation pain level within 2 weeks; PI2 (post-implantation 2)—permanent grid post-implantation pain level that had been achieved after adjustment of stimulation settings within 6–12 months of observation. Means ± standard deviation of the mean.