If my question is lacking something in terms of its validity, please let me know (I am not too seasoned in electric fields) :) Here is the source of my question: http://phys.org/news198350025.html Ok... The brain produces it own electric field, by firing neurons and the chemicals that produce activities in the brain (electrical). So, as the article suggests, a electric field can interfere with the brains electric field. I am trying to get a visual image of this. So, when the brain is doing something specific, and creating a certain electric field, is it possible to introduce a outside electric field that will interfere with the brains electric field? If I was to do some activity, and measure my brains electrical field with a EEG... Then do the same type of activity, but within a different outside electric field (like If I was in a parallel plate capacitor), is that possible? How does the outside electric field difference (like if I was inside a parallel plate cap), interfere with the brains electric field?