Fig. 4From: Continuous Electroencephalography Monitoring in Adults in the Intensive Care UnitColor density spectral array. In this frequency(y) vs time(x) graph, each pixel shows the amplitude of EEG recording, according to its color (purple low, red high). The color range for the amplitude scale is shown on the left. Waveform frequency is displayed on the right. Phases of sudden reduction of faster frequencies during sedation can be easily recognized (arrows)Back to article page