I'm a EEG hobbyist using Olimex EEG SMT, and I'm using 4 dry, active electrodes to record EEG signals (the Olimex uses bipolar montage, so I actually have 2 channels). However, I cannot measure any waves apart from eye movement and hand/leg movement. I'm thinking of spending more money to improve my EEG setup but I don't know exactly why I'm getting this poor quality recordings.
Why I am not getting better results? Do I need conductive paste or do I need more channels? Would conductive paste improve my results? How much? Would more channels improve the signal together with signal processing?