Fig. 3.

Preferred theta phase of theta–gamma correlation on correct and error trials. (A) Polar histogram of the amplitude-weighted mean preferred phases in the postcue period at which gamma activity phase locked in those LFP pairs with significant theta–gamma coupling in the postcue period (n = 85). Colors denote the distributions expected by chance (green) and from the post-attention cue epoch (blue) on correct trials. The outer dotted ring corresponds to a proportion of 20%. The red dot and line denote circular mean and 95% confidence range. (B) Same as in A, but for error trials. (C) Illustration of the mean and 95% confidence range of the preferred theta phases on correct (green) and error trials (red) at which gamma amplitudes couple for the LFP pairs that showed a significant increase in theta–gamma P–A correlation after attention cue onset.