Magnetoencephalographic study of intracerebral interactions caused by bilateral posterior tibial nerve stimulation in man

Neuroscience Research
M ShimojoS Watanabe

Abstract

We studied somatosensory evoked magnetic fields (SEFs) following stimulation of bilateral posterior tibial nerves ('bilateral' waveform) in normal subjects to determine the inter- and intra-hemispheric interference effects caused by activation of sensory areas in bilateral hemispheres. Activated areas in the primary and second sensory cortices (SI and SII) in each hemisphere following bilateral stimulation were clearly identified by estimation of the double best-fitted equivalent current dipoles (ECD) using the spherical head model, and the large inter-individual differences were identified. SEFs following the right posterior tibial nerve stimulation and those following the left stimulation were summated ('summated' waveform). The 'difference' waveform was induced by a subtraction of 'bilateral' waveforms from the 'summated' waveform. Short-latency deflections showed no consistent changes between the 'summated' and 'bilateral' waveforms, but the long-latency deflection, the N100m-P100m, in the 'bilateral' waveform was significantly (P < 0.02) reduced in amplitude as compared with the 'summated' waveform. The differences were clearly identified in the 'difference' waveform, in which the main deflections, U100m-D100m, were found....Continue Reading

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Citations

Apr 5, 2000·Progress in Neurobiology·R KakigiA Nakamura
Sep 19, 1998·Electroencephalography and Clinical Neurophysiology·D NakaH Suzuki
Sep 30, 1998·Current Opinion in Neurobiology·Y Iwamura
Jun 18, 2003·The Journal of Comparative Neurology·Elizabeth DisbrowLeah Krubitzer

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