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NEUROLOGY 1994;44:1283
© 1994 American Academy of Neurology

Somatosensory evoked fields and potentials following tibial nerve stimulation

R. L. Rogers, PhD, L.F.H. Basile, MD, S. Taylor, MS, W. W. Sutherling, MD and A. C. Papanicolaou, PhD

Magnetoencephalography Laboratory (Drs. Rogers, Basile, and Papanicolaou), Department of Neurosurgery, University of Texas Health Science Center, Houston, TX; and the Neuromagnetism Laboratory (Drs. Rogers and Sutherling, and S. Taylor), Epilepsy & Brain Mapping Center, Hospital of the Good Samaritan, Los Angeles, CA.

We studied evoked magnetic fields and electrical potentials following stimulation of the tibial nerve in a group of 24 normal subjects. Both magnetic and electrical recordings demonstrated a series of oscillatory patterns consisting of four peaks (two positive and two negative) occurring between 40 and 100 msec. Magnetic field source localization of all four peaks using a dipole-in-a-sphere model indicated that all four peaks emanated from the same cortical surface located within the longitudinal fissure, an area typically associated with somatosensory function.

Address correspondence and reprint requests to Dr. Robert L. Rogers, Neuromagnetism Laboratory, Hospital of the Good Samaritan, 627 South Lucas Street, Suite 610, Los Angeles, CA 90017.

Supported by grants from the NIH to the University of Texas (NS29540-01) and the Hospital of the Good Samaritan (NS20806-09).

Received September 21, 1993. Accepted in final form January 20, 1994.






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