Topographic mapping of the EEG in premature infants and neonates

The topography of the brain electrical activity is presented for the low voltage theta (LV theta), high voltage slow (HVS), delta brush (DB), tracé alternant (TA), frontal sharp transient (FST), and premature temporal theta (PT theta) patterns in pre-term and term neonates, 28-49 weeks conceptional age. The maps for the delta, theta, and alpha frequency bands are described, demonstrating distinctive localizations and distributions of these patterns, emphasizing midline peaks, especially the Fz for theta (LV theta, TA, DB) and alpha (FST, PT theta) and the Pz for delta (DB, HVS, PT theta). Topographic variability of these patterns tends to decrease in those rhythms that are developing with advancing conceptional age and increase in those that are diminishing in time.