N. Arai, S. Okabe, T. Furubayashi, Y. Terao, K. Yuasa et al., Comparison between short train, monophasic and biphasic repetitive transcranial magnetic stimulation (rTMS) of the human motor cortex, Clinical Neurophysiology, vol.116, issue.3, pp.605-618, 2005.
DOI : 10.1016/j.clinph.2004.09.020

D. Burke, R. Hicks, and J. Stephen, Corticospinal volleys evoked by anodal and cathodal stimulation of the human motor cortex., The Journal of Physiology, vol.425, issue.1, pp.283-99, 1990.
DOI : 10.1113/jphysiol.1990.sp018103

D. Burke, R. Hicks, J. Stephen, I. Woodforth, and M. Crawford, Assessment of corticospinal and somatosensoty conduction simultaneously during scoliosis surgery, Electroencephalography and Clinical Neurophysiology/Evoked Potentials Section, vol.85, issue.6, pp.388-96, 1992.
DOI : 10.1016/0168-5597(92)90052-D

B. Calancie, W. Harris, J. Broton, N. Alexeeva, and B. Green, ???Threshold-level??? multipulse transcranial electrical stimulation of motor cortex for intraoperative monitoring of spinal motor tracts: description of method and comparison to somatosensory evoked potential monitoring, Journal of Neurosurgery, vol.88, issue.3, pp.457-70, 1998.
DOI : 10.3171/jns.1998.88.3.0457

V. Deletis, Basic methodological principles of multimodal intraoperative monitoring during spine surgeries, European Spine Journal, vol.117, issue.2, pp.147-52, 2007.
DOI : 10.1007/s00586-007-0429-4

V. Deletis and F. Sala, Intraoperative neurophysiological monitoring of the spinal cord during spinal cord and spine surgery: A review focus on the corticospinal tracts, Clinical Neurophysiology, vol.119, issue.2, pp.248-64, 2008.
DOI : 10.1016/j.clinph.2007.09.135

V. Deletis, V. Isgum, and V. Amassian, Neurophysiological mechanisms underlying motor evoked potentials in anesthetized humans., Clinical Neurophysiology, vol.112, issue.3, pp.438-482, 2001.
DOI : 10.1016/S1388-2457(01)00461-8

A. Gorman, Differential patterns of activation of the pyramidal system elicited by surface anodal and cathodal cortical stimulation, J Neurophysiol, vol.29, issue.4, pp.547-64, 1966.

Y. Huang, M. Edwards, E. Rounis, K. Bhatia, and J. Rothwell, Theta Burst Stimulation of the Human Motor Cortex, Neuron, vol.45, issue.2, pp.201-207, 2005.
DOI : 10.1016/j.neuron.2004.12.033

S. Jones, R. Harrison, K. Koh, N. Mendoza, and H. Crockard, Motor evoked potential monitoring during spinal surgery: responses of distal limb muscles to transcranial cortical stimulation with pulse trains, Electroencephalography and Clinical Neurophysiology/Evoked Potentials Section, vol.100, issue.5, pp.375-83, 1996.
DOI : 10.1016/0168-5597(96)95728-7

J. Lefaucheur, Methods of therapeutic cortical stimulation, Neurophysiologie Clinique/Clinical Neurophysiology, vol.39, issue.1, pp.1-14, 2009.
DOI : 10.1016/j.neucli.2008.11.001

J. Lefaucheur, Neurophysiology of Cortical Stimulation, Int Rev Neurobiol, vol.107, pp.57-85, 2012.
DOI : 10.1016/B978-0-12-404706-8.00005-X

R. Lyon, J. Lieberman, M. Grabovac, and S. Hu, Strategies for Managing Decreased Motor Evoked Potential Signals While Distracting the Spine During Correction of Scoliosis, Journal of Neurosurgical Anesthesiology, vol.16, issue.2, pp.167-70, 2004.
DOI : 10.1097/00008506-200404000-00012

D. Macdonald, Safety of Intraoperative Transcranial Electrical Stimulation Motor Evoked Potential Monitoring, Journal of Clinical Neurophysiology, vol.19, issue.5, pp.416-445, 2002.
DOI : 10.1097/00004691-200210000-00005

D. Macdonald, Intraoperative Motor Evoked Potential Monitoring: Overview and Update, Journal of Clinical Monitoring and Computing, vol.99, issue.3, pp.347-77, 2006.
DOI : 10.1007/s10877-006-9033-0

D. Macdonald, A. Zayed, Z. Khoudeir, I. Stigsby, and B. , Monitoring Scoliosis Surgery With Combined Multiple Pulse Transcranial Electric Motor and Cortical Somatosensory-Evoked Potentials From the Lower and Upper Extremities, Spine, vol.28, issue.2, pp.194-203, 1976.
DOI : 10.1097/00007632-200301150-00018

L. Niehaus, B. Meyer, and T. Weyh, Influence of pulse configuration and direction of coil current on excitatory effects of magnetic motor cortex and nerve stimulation, Clinical Neurophysiology, vol.111, issue.1, pp.75-80, 2000.
DOI : 10.1016/S1388-2457(99)00198-4

K. Novak, A. De-camargo, M. Neuwirth, K. Kothbauer, V. Amassian et al., The refractory period of fast conducting corticospinal tract axons in man and its implications for intraoperative monitoring of motor evoked potentials, Clinical Neurophysiology, vol.115, issue.8, pp.1931-1972, 2004.
DOI : 10.1016/j.clinph.2004.03.016

F. Pastorelli, D. Silvestre, M. Plasmati, R. Michelucci, R. Greggi et al., The prevention of neural complications in the surgical treatment of scoliosis: the role of the neurophysiological intraoperative monitoring, European Spine Journal, vol.13, issue.2, pp.105-119, 2011.
DOI : 10.1007/s00586-011-1756-z

U. Pechstein, C. Cedzich, J. Nadstawek, J. Schramm, J. Nadstawek et al., Transcranial high-frequency repetitive electrical stimulation for recording myogenic motor evoked potentials with the patient under general anesthesia Isoflurane plus nitrous oxide versus propofol for recording of motor evoked potentials after high frequency repetitive electrical stimulation, Neurosurgery Electroencephalogr Clin Neurophysiol, vol.39108, issue.22, pp.335-43175, 1996.

L. Pelosi, J. Lamb, M. Grevitt, S. Mehdian, J. Webb et al., Combined monitoring of motor and somatosensory evoked potentials in orthopaedic spinal surgery, Clinical Neurophysiology, vol.113, issue.7, pp.1082-91, 2002.
DOI : 10.1016/S1388-2457(02)00027-5

P. Reinacher, H. Priebe, W. Blumrich, J. Zentner, and K. Scheufler, The Effects of Stimulation Pattern and Sevoflurane Concentration on Intraoperative Motor-Evoked Potentials, Anesthesia & Analgesia, vol.102, issue.3, pp.888-95, 2006.
DOI : 10.1213/01.ane.0000195235.02162.5d

K. Scheufler, P. Reinacher, W. Blumrich, J. Zentner, and H. Priebe, The Modifying Effects of Stimulation Pattern and Propofol Plasma Concentration on Motor-Evoked Potentials, Anesthesia & Analgesia, vol.100, issue.2, pp.440-447, 2005.
DOI : 10.1213/01.ANE.0000141678.04200.86

D. Schwartz, J. Auerbach, J. Dormans, J. Flynn, D. Drummond et al., Neurophysiological Detection of Impending Spinal Cord Injury During Scoliosis Surgery, The Journal of Bone and Joint Surgery-American Volume, vol.89, issue.11, pp.2440-2449, 2007.
DOI : 10.2106/00004623-200711000-00015

M. Sutter, V. Deletis, J. Dvorak, A. Eggspuehler, D. Grob et al., Current opinions and recommendations on multimodal intraoperative monitoring during spine surgeries, European Spine Journal, vol.117, issue.9, pp.232-239, 2007.
DOI : 10.1007/s00586-007-0421-z

A. Szelenyi, K. Kothbauer, and V. Deletis, Transcranial electric stimulation for intraoperative motor evoked potential monitoring: Stimulation parameters and electrode montages, Clinical Neurophysiology, vol.118, issue.7, pp.1586-95, 2007.
DOI : 10.1016/j.clinph.2007.04.008

M. Taniguchi, C. Cedzich, and J. Schramm, Modification of Cortical Stimulation for Motor Evoked Potentials under General Anesthesia, Neurosurgery, vol.32, issue.2, pp.219-245, 1993.
DOI : 10.1227/00006123-199302000-00011

S. Ulkatan, M. Neuwirth, F. Bitan, C. Minardi, A. Kokoszka et al., Monitoring of scoliosis surgery with epidurally recorded motor evoked potentials (D wave) revealed false results, Clinical Neurophysiology, vol.117, issue.9, pp.2093-101, 2006.
DOI : 10.1016/j.clinph.2006.05.021