Information about brain oscillatory activity during CPT (Continuous Performance Test) or the Go/NoGo task is very scarce. Using a visual discrimination (Go/NoGo) task, Shibata et al. [26] found that synchronization measured by event-related coherence under NoGo condition is related to two components: alpha band synchronization between frontal areas, which is presumably related to the decision not to respond, and more extended theta band synchronization among bilateral frontal, central and parietal areas, which is more likely related to the motor inhibition process. In another paper [27], they reported increased gamma band oscillations over the motor areas at around 200 ms in Go trials and gamma activity in the central area at around 230 ms in NoGo trials. The first high frequency gamma oscillation (78–94 Hz) seems to be related to the motor action, and the second low frequency gamma band oscillation (23–31 Hz) seems to be related to the inhibition process. Recently, using a cued Go/NoGo Task, a stronger phase synchronization measured by ITC (inter-trial coherence), a measure like PLI in this study, was found in NoGo as compared to Go
