By Martin Vömel, Dieter Zastrow
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Additional resources for Aufgabensammlung Elektrotechnik, Bd.2, Magnetisches Feld und Wechselstrom
14 The world’s first clinical magnetic stimulator in use at the University of Sheffield in 1985, England. ) eminence and connected to an electromyographic (EMG) recorder. The thumb muscles twitched, and an EMG response was recorded. For the sake of comparison, the stimulus was then delivered to skin-surface electrodes over the median nerve; the EMG response was found to be identical. On 12 February 1985, the Sheffield group attempted for the first time to stimulate the human brain with a more powerful and efficient magnetic stimulator in the laboratory of P.
To complete their investigation, they placed the nerve-muscle preparation in a Petri dish filled with saline. They placed the dish on the pole face of the magnet and applied alternating current to the coil, which resulted in tetanic contraction of the gastrocnemius muscle. This experiment offered definitive proof that a magnetic field could induce enough current to stimulate a motor nerve. qxd 3/24/03 9:22 AM Page 36 CHAPTER 2 P U L S E D M AG N E T I C F I E L D S OF AND THE MODERN ERA M AG N E T I C S T I M U L AT I O N In 1965, Bickford and Fremming first used a pulsed magnetic field to twitch skeletal muscle in intact frogs, rabbits, and humans.
A notable example is the case of Miss Paradis, a young pianist blind since the age of four to whom Mesmer restored partial vision by “magnetizing” her. The patient and her family initially were delighted with the “cure,” but when they questioned Mesmer and magnetism Mesmer and his followers threatened them aggressively and bitterly. Mesmer was not to be ignored. He was a flamboyant and obstinate individual who held his ideas with unshakable conviction, gaining large numbers of followers and faithful believers.
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