Results of this double-blind, placebo-controlled study demonstrated that the administration of a pulsed magnetic field for less than one hour to headache patients produced significant beneficial effects, as shown subjective patient reports, as well as EEG activity.

O. Grunner, et al., “Cerebral Use of a Pulsating Magnetic Field in Neuropsychiatry Patients with Long-term Headache,” EEG EMG Z Elektroenzephalogr Verwandte Geb, 16(4), December 1985, p. 227-230