In the literature, phase synchronization across trials as measured by PLI is associated with strong neural timing induced through stimulus processing and could be a signature of temporal coding used by neural populations for stimulus encoding and processing ([23], [30], whereas phase coherence (i.e., phase synchronization between different electrode locations) is understood as a measure of interactive neural synchronization or integration of numerous functional areas widely distributed over the brain [10], [23], [29], [36]. Thus, stimulus processing in Go and NoGo trials as compared to other trials (e.g., Warning or Neutral) produced more synchronous activity at different electrode locations and also greater synchronization between different brain areas supporting widely distributed integration processes under these conditions. Furthermore, there were significant differences in synchronization patterns for Go and NoGo conditions modulated by topography and time course. The most general effect concerning both synchronization measures (i.e., PLI and PC) and both frequency bands (i.e., delta and theta) is related to earlier synchronization in Go as compared with NoGo trials. Interestingly, this fast synchronization in Go trials reaching their maxima in the first time
