unitary electrophysiological phenomenon elicited during cognitive processing; but emanates from multiple sources in the brain with contributions from frontal cortex (including anterior cingulate), parietal cortex, and hippocampus [7,67-71]; furthermore, it is primarily the outcome of event-related delta (concentrated more posteriorly) and theta (concentrated more anteriorly) oscillations [72-78]. Thus, because the EROs can analyze brain signals in terms of their constituent time-frequency components arising from various brain regions during sensory and cognitive events based on task conditions, they provide greater utility in understanding brain function than the traditional ERPs.
