Those neurons that are well-aligned and fire together will show the greatest EEG signal. Instead, EEG activity always reflects the summation of synchronous activity from thousands or even millions of neurons when they have similar spatial orientation. We can never measure the electric potential of an individual neuron - this is simply too small to be picked seen on an EEG. This leads to a voltage - recording these voltages over time leads to the EEG signal. This wave of ions will reach the electrodes at the scalp, where they will push or pull electrons within the metal on the electrodes (see picture to the left). When many ions are pushed out at the same time, a wave occurs, called volume conduction.
These charged ions, when of similar charge, repel each other. These neurons are electrically charged (or "polarized") as ions are pumped across their cell membranes.
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