Gamma band phase-locking values. As with Fig. 2, average phase-locking values (PLV) between auditory and prefrontal cortices of controls (blue), medicated (red), and unmedicated (green) adults with ADHD are grouped along the x-axis and separated by condition (attend and no-attend). Significant differences were noted between unmedicated adults with ADHD and controls in the attend (P < 0.02, uncorrected) and no-attend conditions (P = 0.05, uncorrected). Error bars indicate one standard error of the mean. † = P < 0.05, uncorrected.