M1 is the region of the brain responsible for movements, so by measuring electrical signals in particular places, the brain interface can effectively directly control robotic limbs.
(could also measure electrical signals as in the case of Current Sensors)
For measuring repetitive signals, this type can have bandwidth and high-speed timing up to ten times higher than any other oscilloscope.
Also its signals would contain a lot less noise, particularly important in measuring and handling very weak signals.
Brain fingerprinting is fundamentally different from the polygraph (lie-detector), which measures emotion-based physiological signals such as heart rate, sweating, and blood pressure (Farwell 1994).
At Camp David, the leaders of the United States and the Soviet Union had only to issue a few carefully measured signals to achieve their ends.
There is an additional multiplex advantage when one is measuring signals such as the emission lines of atomic and molecular spectra.
It improves the sensitivity issue by introducing microfabricated cantilevers to measure tiny signals.
Cohen then measured the first clear MEG, and signals from other organs.
This allows them to measure signals at lower frequencies than can be detected with seismometers.