Delta rhythm: An EEG rhythm consisting of 1-4 Hz activity.
Dominant posterior rhythm: An EEG pattern with frequency appropriate to age which is observed over the occipital regions during relaxed wakefulness with eyes closed and attenuates with eye opening or attention.
Dypnagogic hypersynchrony: An EEG pattern consisting of paroxysmal runs or bursts of diffuse high amplitude sinusoidal 75 to 350 u V 3-4.5 Hz waves which begin abruptly, are usually widely distributed but often maximal over the central, frontal, or frontocentral scalp regions.
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