Técnicas de Caracterização de Polímeros

Abstract

There are two important variables which influence the EEG: age and level of vigilance. This chapter deals with the influence of age and maturation of the EEG. Among other factors it reflects the myelination and synaptogenesis of the brain. Cerebral maturation is not a smooth and steady process, one can observe "jumps" in prematurity, as well as in infancy and childhood. Particularly in the neonatal period of preterm and term newborns the EEG poses a lot of problems of technology and interpretation. This includes the appearance of age-specific patterns (Figs. 2-6), which are interpretated as normal features only in a short age range. EEG evolution from infancy to adolescence is characterized by the development of various frequency ranges (Fig. 7), appearance of age-specific patterns during different levels of vigilance (Figs. 8-11) and a high variability in background activity concerning wave amplitude and regularity or irregularity of wave forms. (PsycINFO Database Record (c) 2012 APA, all rights reserved) (journal abstract)