Brain wave is not electromagnetic radiation (e.g., visible light, radio wave, ...). The action potential in individucal neuron is too weak for detection (by current technology). It is the coherent oscillation of ionic charges in million neurons that is detected by the electroencephalogram (EEG). Figure 15 shows the simulation of neural oscillations at 10 Hz. Upper panel shows spiking (action potential) of individual neurons with each dot representing an individual action potential within the population of neurons, and the lower panel the macroscopic potential reflecting their summed activity. It illustrates how synchronized patterns of action potentials may result in macroscopic oscillations that can be measured on the scalp.
http://universe-review.ca/R10-11-gradient02.htm
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