Important biophysical and technological aspects of EEG for clinical applications

The EEG is an electrophysiological technique for the recording of electrical activity arising from the human brain. EEG is the most commonly used functional investigative method in epilepsy.For the first time Hans Berger, a German psychiatrist, recorded electrical activity of human brain. He described the human alpha and beta rhythms and published his paper in ۱۹۲۹. finally, in ۱۹۸۰ digital EEG system was introduced.In this lecture I explain how EEG signals are generated in the brain and how they are recorded by the EEG machine. Also, I explain a number of Electrical Circuit elements and important components of EEG machine such as electrodes, filters, amplifier, analog to digital convertor.Understanding these basics is essential for interpretation of clinical EEG