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The EEG holds great promise as a monitor in the operating room, particularly for estimating the depth of anesthesia and detecting the presence of cerebral ischemia. This promise has not yet been realized, however. The main obstacle to the realization of these goals has been the raw EEG itself. The tracing is difficult to interpret without considerable training. Only a few seconds of raw EEG are available for inspection at any one time, making it difficult to follow trends. The standard written EEG record during a case is voluminous, being generated at the rate of up to 300–600 pages per hour. For these and other reasons, additional personnel are usually required if one wishes to record the conventional EEG in the operating room.