Magnetomyography (MMG) is a technique for mapping muscle activity by recording magnetic fields produced by electrical currents occurring naturally in the muscles, using arrays of SQUIDs (superconducting quantum interference devices). It has a better capability than electromyography for detecting slow or direct currents.
History
The development of this technique has been influenced by the development of SQUIDs.
References
Magnetomyography Wikipedia(Text) CC BY-SA