Global field power plots from frontal sensors. Upper plots: Global field power (GFP) plots from the frontal magnetoencephalography (MEG) sensors for the inhibition trials for the two conditions in the control adolescents (top plot) and the adolescents with autism spectrum disorder (ASD) (middle plot). Lower plot: Difference waveforms for Global field power (GFP) between the inhibition and baseline conditions, measured by MEG sensors over the frontal area of the brain on correct no-go trials for the two groups: control (blue) and ASD (gold). Stimulus onset is marked at 0 seconds. Four 50 ms time windows of interest are marked.