The aim of this extensively illustrated work is to better the knowledge of visual analysis of EEGs for neurologists and other specialists who use electroencephalography as well as EEG technologists. This first volume covers the scope of the main features of physiological EEG wake and sleep activities in children and adults, activation procedures and the most commonly found artefacts. Indeed, a more thorough knowledge of these elements is necessary so as not to misinterpret them as pathological traits.