Figure 5.

Four examples, each 5 seconds in duration, of high frequency bursts of EEG activity from an infant born at 30 weeks gestation and studied at 5 weeks after birth. The examples show various patterns: high frequency bursts in association with low frequency activity (top tracing), in the absence of low frequency activity (second tracing), coincident with an abrupt transient (third tracing), and coincident with a burst of activity at ∼7Hz (bottom tracing).