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Comparison of descending volleys evoked by monophasic and biphasic magnetic stimulation of the motor cortex in conscious humans

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Abstract.

The descending spinal volleys evoked by monophasic and biphasic magnetic stimulation of the motor cortex were recorded from a bipolar electrode inserted into the cervical epidural space of four conscious human subjects. The results suggest that both phases of the biphasic pulse are capable of activating descending motor output. The pattern of recruitment of descending activity depends on the intensity of the stimulus and the relative threshold of each volley to each direction of current flow.

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Authors and Affiliations

  1. Institute of Neurology, Università Cattolica, L. go A. Gemelli 8, 00168 Rome, Italy, , , , ,

    V. Lazzaro,  A. Oliviero,  F. Pilato,  E. Saturno,  A. Accurso &  P. Tonali

  2. Operative Unit of Functional Neurosurgery CTO, Via S. Nemesio 21, 00145 Rome, Italy, , , , ,

    P. Mazzone

  3. Operative Unit of Neurophysiology CTO, Via S. Nemesio 21, 00145 Rome, Italy, , , , ,

    A. Insola

  4. Sobell Department of Neurophysiology, Institute of Neurology and The National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, UK, , , , ,

    J. Rothwell

Authors
  1. V. Lazzaro
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  2. A. Oliviero
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  3. P. Mazzone
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  4. A. Insola
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  5. F. Pilato
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  6. E. Saturno
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  7. A. Accurso
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  8. P. Tonali
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  9. J. Rothwell
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Lazzaro, .V., Oliviero, .A., Mazzone, .P. et al. Comparison of descending volleys evoked by monophasic and biphasic magnetic stimulation of the motor cortex in conscious humans. Exp Brain Res 141, 121–127 (2001). https://doi.org/10.1007/s002210100863

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  • DOI: https://doi.org/10.1007/s002210100863

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