[juiceandjuice]

I don't think you've looked into the research regarding MEG and EEG, especially regarding noise. It's possible you are right, but without a room temperature superconductor and/or implantation, it's going to be hard.

If we get a body temperature superconductor, a whole lot of other things are going to change and a SQUID patch on your brain is going to be one of the more boring advances from that technology.