Q.How does a normal EEG appear?

An EEG (electroencephalogram) evaluates the brain's electrical activity by recording, via surface electrodes on the scalp, the tiny electrical impulses brain cells use to communicate. It produces a graphical trace of cortical and sub-cortical electrical activity, first recorded by German scientist Hans Berger in 1929 - hence EEG waves are also called 'Berger waves'. Recorded activity may be synchronised or desynchronised and is classified into four frequency bands: alpha, beta, delt …