Magnetic stimulation of the human motor cortex: ipsilateral and contralateral facilitation effects.

摘要: Voluntary contraction of a muscle greatly increases the amplitude and decreases latency motor potentials evoked by electromagnetic coil brain stimulation (facilitation). Facilitation has also been observed with nearby ipsilateral contralateral homologous muscle. We studied these facilitatory relationships in 5 normal subjects small hand, forearm upper arm muscles using surface-recorded compound action potentials, single unit recordings, post-stimulus time histograms. There was no evidence for spread facilitation between any pair if from which (MEPs) were recorded completely at rest during stimulation, although this sometimes required training to accomplish or could not be achieved. Thus, others under conditions, we did find effect. may significant interindividual variations degree spread.