Relatively few studies have examined EROs during a Go/NoGo task. Muller and Anokhin (2012) examined temporal (phase-locking index across trials (a.k.a. PLI) and spatial (phase coherence across electrode sites) synchrony of neuroelectric activity during a continuous performance Go/NoGo task in university students; they found that both synchrony measures increased in Go and NoGo conditions, followed by warning, and lowest in neutral stimuli. Both measures showed their strongest effects in delta and theta frequency bands, where the Go condition accounted for the increase in the first post-stimulus time interval (0-300 ms) whereas NoGo accounted for the increase during the second post-stimulus time interval (300-600 ms) in the delta band. Although phase synchrony, especially as measured by PLI, was in general highest in centro-parietal sites, it was stronger for the Go compared to the NoGo condition at centro-parietal sites during the first post-stimulus time interval (0-300 ms). On the other hand, PLI for the NoGo condition was stronger compared to the Go condition at frontocentral sites during the second post-stimulus time interval (300-600). Another study using a cued Go/NoGo task found stronger
