Because sea turtles use
a similar magnetic map, the researchers speculate that many migratory marine animals, such as eels, sharks, and seals, may also navigate using magnetic fields.
Another technique dubbed magnetoencephalography (MEG)
maps magnetic fields in the brain produced by electrical signals; a
similar approach, transcranial
magnetic stimulation (TMS), selectively stimulates parts of the brain and is already being used to treat severe depression, migraine headaches and other conditions.