"In fact, it (the human brain) is the known universe. Everything we know - from subatomic particles to distant galaxies - everything we feel - from love of our children to fear of enemy nations - is experienced and modeled in our brains. Without the brain, nothing - not quarks, not black holes, nor love, nor hatred - would exist for us."
-- The Three-Pound Universe, Judith Hooper and DickTeresi
The basis for human brain activity monitoring:
The neuronal activities of the brain generate an electric field and a magnetic field of the brain. A current source Q in a neuron causes a current I flowing within the brain, producing an electric potential difference V on the scalp S, which can be measured and shown by electroencephalography (EEG), and a magnetic field B around the brain, which can be measured and shown by magnetoencephalography (MEG)
