Eeg signals are generated by your brain.There are different waves for different areas of the brain and the level of conciousness(awake,asleep,drowsy,deep sleep,etc).Try doing a search on eeg waves,you may find something there.Are you looking for the specific wave names and frequencies or just general info??
Patty

Thank you for the reply. I want to know the specific waveform pattern and its digital values. So that it might be useful to do my project work.