text: The 'electrical' activity of the brain is largely chemical, and is mostly unaffected by magnetic fields.  However, magnetic fields can be used as part of a system to measure what's happening in your brain.  These various scans are a medical diagnostic tool and also a research tool.  Nuclear magnetic resonance imaging can distinguish among differing tissue types.\n\nAnd no, magnetism and electrically are not the same.  They are interdependent, but are both independent of gravity.