 Retrospectively, children with intrauterine growth restriction defined as a birth weight below the 10th percentile treated at the Neonatal Intensive Care Unit NICU of the Medical University Vienna between 2005 and 2007 were included in the study. Besides IUGR, inclusion criteria were gestational age between 231 and 296 weeks and routinely assessed aEEG measurements. Infants with congenital anomalies and severe asphyxia were excluded. The control group consists of infants of the same age with normal birth weight 10th percentile in the same study period. 