Figure 2

Node degree and frequency are positively correlated with chronic pain intensity. (a) The degree-frequency correlation coefficient positively correlates with the pain intensity. Each marker represents an individual. (b) The relationship between node degrees and median frequencies for all EEG channels from two exemplary subjects with low (1) and high (77) pain intensities. The individual with a high pain score displayed a positive relationship between node degree and median frequency of EEG channels, whereas no correlation is observed for the individual with low pain. Each circle and square represents an EEG channel.