EROs are measures of cognitive processing in response to a stimulus or event, and are considered to be building blocks of various neurocognitive functions; each frequency activity of EROs represents several specific cognitive functions [79,217]. EROs facilitate neural communication across brain regions through synchrony, with low frquency oscillations (such as delta, theta and alpha) for long-range communication and high frequency oscillations (such as beta and gamma) for short-range communication [108].
