This book describes genetic studies of normal EEG findings, mainly twin studies and family studies. Among the family studies, EEG variants having a single mendelian mode of inheritance are emphasized, the available data are described critically and in detail. Morevover, psychological studies on carriers of these EEG variants are described and discussed critically. The significance of an EEG for psychological anomalies such as psychoses, psycho- and sociopathies, and alcohol addiction is considered. Features of a "normal" EEG that point to a higher susceptibility for epilepsy are mentioned. Genetic aspects of event-related (evoked) potentials are also described. There are many EEG curves as well as other graphics. This is the first monograph on this topic, and combines two fields of expertise - human genetics and clinical neurophysiology - that are normally strictly separated.