Our brains "VIBRATE?"
Here's a link to a story on the BBC website about research regarding infrasonics and church organs. It concludes that low frequency sounds from church organs are responsible for a wide range of emotional responses that people may feel at religious ceremonies.
You guys understand that the EEG measures electrical wave patterns, not physical motion. Our bodies do vibrate, and the frequencies have more to do with the heart rate and the resonances of the different body cavities and chambers. The sound production of the voice is a very interesting science which is well described back to the 70's. I recall an article in Science back to that era when I was a serious voice student although I cannot quote you the date. The reason we feel different frquencies in different parts of our bodies have to do with these resonances, not to be confused with the chemo-electrical output of cental nervous and muscular tissues .