Abstract: A non-invasive therapeutic technique for treating neuro-cerebral disorders such as multiple sclerosis that are characterized by internal lesions in brain tissue. In this technique, directed toward an external site on the body of the subject to be treated adjacent the internal lesions is a pulsatory corona discharge beam which impinges on the site and bombards the lesions with ions to alleviate the disorder. The beam is produced by an energy-generating unit in which a radio-frequency carrier is modulated by an audio frequency signal that is chopped into pulses. In the course of an operating period having a brief duration, such as one minute, the pulses have a progressively stepped up repetition rate, resulting in corresponding bursts of radio-frequency energy. The bursts of energy yielded by the unit are applied to the discharge electrode of an applicator from which the corona discharge beam is projected toward the site.