Event-related delta activity is generated by cortico-cortical interactions [74], and is a product of the distributed network system of the brain [73,91] and involved in signal detection and decision making [73,91,96]. On the other hand, event-related theta oscillations are related to cortico-hippocampal [91,128] or frontolimbic interactions [83], and are associated with a complex set of cognitive processes including alertness, arousal or readiness [91], episodic encoding and retrieval processes [92,129], selective attention and short-term memory [73,130-132], error processing [133-135] and reward processing [136-139]. These delta and theta EROs have been derived from several cognitive paradigms, including the oddball task, Go/NoGo task, and a gambling task, to study alcoholism and related clinical conditions, as discussed below.
