A comparative E.E.G. study was conducted in 40 newborns, gestational age varying from 28 to 40 weeks, who were found to have intraventricular hemorrhages at autopsy, and 21 infants of the same ages in whom intraventricular hemorrhage was absent on computed tomography examinations. Early and repeated E.E.G. examinations were carried out in both groups. Anomalies were present more frequently in the group with intraventricular hemorrhage, and in half the cases a disorganized E.E.G. was observed with a maturation impossible to evaluate. Other E.E.G. anomalies (electrical seizures, positive rolandic spikes, flat or paroxystic tracings) were more frequent in the disorganized tracings than in those where maturation was possible. The anomalies recorded appeared earlier (before the 4th day of life), and were more easily identifiable in the newborn over 50 weeks of age, positive rolandic spikes being less frequent than electrical seizures and not occurring before 30 weeks.