Magnetic stimulation using microcoils: a skeptical review
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| brain |
| capacitive coupling |
| electric field |
| electromagnetic induction |
| magnetic field |
| microcoil |
| neuron |
| transcranial magnetic stimulation |
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Abstract
Recently several research groups have used sub-millimeter-sized microcoils to perform magnetic stimulation of nerves. This review assesses the magnitude of the electric field induced by these microcoils. In some cases magnetic stimulation is a plausible mechanism for neural excitation, but in other cases the induced electric field is far too small to excite a neuron. These results indicate that microcoil magnetic stimulation may not occur via magnetic stimulation but by some other mechanism. One alternative mechanism is capacitive coupling.
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