A distinction should be made between electromagnetic sensitivity, and symptoms an individual labels as such. Researchers have failed in proving that those claiming sensitivity to electromagnetism can accurately determine the presence of a strong electromagnetic field. Nevertheless, the perceived symptoms are real for the patient, and should be honored as such, or until it can be demonstrated that they are psychosomatic or have some other physical source. Many people who meditate, for example, perceive energy movements in their body and learn to work with these. But a second distinction must be made between those who successfully work with unusual psychological states and these who find them debilitating. For the later, either drugs or meditative practice may or may not be helpful. Overcoming, defusing, or sublimating debilitating mental states is never easy.
In electrodynamic suspension (EDS), both the guideway and the train exert a magnetic field, and the train is levitated by the repulsive and attractive force between these magnetic fields.  In some configurations, the train can be levitated only by repulsive force. In the early stages of maglev development at the Miyazaki test track, a purely repulsive system was used instead of the later repulsive and attractive EDS system.  The magnetic field is produced either by superconducting magnets (as in JR–Maglev) or by an array of permanent magnets (as in Inductrack ). The repulsive and attractive force in the track is created by an induced magnetic field in wires or other conducting strips in the track. A major advantage of EDS maglev systems is that they are dynamically stable – changes in distance between the track and the magnets creates strong forces to return the system to its original position.  In addition, the attractive force varies in the opposite manner, providing the same adjustment effects. No active feedback control is needed.