Charles M. Epstein

in Oxford Handbook of Transcranial Stimulation

Published in print January 2008 | ISBN: 9780198568926
Published online November 2012 | | DOI:

Series: Oxford Library of Psychology


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  • Neuropsychology
  • Cognitive Neuroscience



This article elucidates on the concept of electromagnetism and electromagnetic induction with a view to explaining the theory of magnetic stimulation, used to cure diseases in human beings. Magnetic stimulation follows the principles of electromagnetism. A changing primary current induces secondary currents, which are called eddy currents, in the nearby conductors (human tissue in this case). The strength of the electric field is measured by its electromotive force (emf), which in turn, is measured in volts. The changing primary current also gives rise to an induced voltage in the primary loop itself. The essential circuitry of a magnetic stimulator is composed of three elements, the capacitor, inductance of the stimulation coil, and a switch to connect them. This article also explains the process of the energy flow system through the inductor-capacitor system, applying this principle to the biphasic TMS pulse.

Keywords: electromagnetism; electromagnetic induction; magnetic stimulation; eddy currents; magnetic stimulator; inductor-capacitor system

Article.  1444 words. 

Subjects: Psychology ; Neuropsychology ; Cognitive Neuroscience

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