Figure 4.

Interpersonal coordination results. (a) (Mean signed asynchronies) and (b) (mean relative phase) are indices of instantaneous leadership. (c) (d(1,2)) and (d) (relative timing variability) are indices of coupling directionality. Positive values indicate that the low-pitch player produces musical tones and movements earlier than the high-pitch player (in (a,b)), or that the low pitch player was influencing the high-pitch player performance more than vice versa (in (c,d)), whereas negative values indicate the opposite. Each separate bar represents a different leadership condition. Error bars indicate 1 s.e.m. n.s., not significant, *p<0.05, ***p<0.001.