Interference of short-interval intracortical inhibition (SICI) and short-interval intracortical facilitation (SICF)

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
Sinikka H PeuralaUlf Ziemann

Abstract

Short-interval intracortical inhibition (SICI) is a widely used paired-pulse transcranial magnetic stimulation (TMS) measure to assess inhibition in human motor cortex. However, facilitatory processes may contaminate SICI under certain conditions. Here, we specifically address the contribution of short-interval intracortical facilitation (SICF). A SICF interstimulus interval (ISI) curve was obtained in nine healthy subjects according to an established paired-pulse TMS protocol [Ziemann U, Tergau F, Wassermann EM, Wischer S, Hildebrandt J, Paulus W. Demonstration of facilitatory I-wave interaction in the human motor cortex by paired transcranial magnetic stimulation. J Physiol (Lond) 1998a;511:181-190]. The individual ISI leading to SICF peak1, trough1, peak2, trough2 and peak3 was selected for the subsequent measurement of SICI intensity curves (SICI(peak1), SICI(trough1), SICI(peak2), SICI(trough2), SICI(peak3)) using intensity variation of the first stimulus (S1) from 50% to 120% of active motor threshold (AMT) in the first dorsal interosseous muscle. SICI(peak1) (mean ISI, 1.54ms) and SICI(trough1) (mean ISI, 1.97ms) showed a sigmoid SICI increase with S1 intensity. SICI(trough1) reached the strongest SICI and was therefore ...Continue Reading

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