Magnetic stimulation of the human brain: facilitation of motor responses by voluntary contraction of ipsilateral and contralateral muscles with additional observations on an amputee |
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| Authors: | C W Hess K R Mills N M Murray |
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| Affiliation: | 1. Smell and Taste Center, Department of Otorhinolaryngology, University of Pennsylvania, Philadelphia, USA;2. Mediciencias Research Group, Unicolciencias/Universidad Nacional, Bogota, Colombia;3. Center for Advanced Research in Neurophysiology, SVYASA University, Bangalore, India;4. Charity Association for Person Centered Medicine-Moral Entity, Bologna, Italy;5. Faculty of Medicine, Universidad de La Sabana, Bogota, Colombia;6. Faculty of Health Sciences, Universidad de Santander, UDES, Bucaramanga, Colombia;7. School of Arts and Sciences, University of Pennsylvania, Philadelphia, USA;8. Epidemiology and Risk Program, Harvard School of Public Health, Harvard University, Boston, MA, USA |
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| Abstract: | An intense rapidly changing magnetic field generated in a coil over the scalp can excite motor pathways to hand muscles. With a suprathreshold stimulus, the amplitude of the muscle action potential of the abductor digiti minimi is increased: by weak contraction of the muscle itself, by weak contraction of the ipsilateral first dorsal interosseus, by stronger contraction of the contralateral abductor digiti minimi, but not by contraction of the contralateral first dorsal interosseus, nor by the ipsilateral quadriceps muscle. This facilitation of response to brain stimulation may occur by two mechanisms, one related to the focussing of attention onto a particular hand, the second involving a rise in excitability of homologous motor pathways. |
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