Fig. 4

Observed mu attenuation by group. Mu attenuation is depicted as the mean log of the ratio of power in the mu frequency (8–13 Hz) during social (green) and nonsocial (orange) conditions, separately for live action (LA, solid) and computer-generated (CG, striped) stimuli environments. Box plots represent the distribution of mu attenuation across trials as the lower and upper quartiles (black line = median). Whiskers represent 1.5 times the box height, and dots and asterisks represent outliers