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Kojima S, Miyaguchi S, Yokota H, et al. The Number or Type of Stimuli Used for Somatosensory Stimulation Affected the Modulation of Corticospinal Excitability. Brain Sci. 2021;11(11)doi: 10.3390/brainsci11111494.
Kojima, S., Miyaguchi, S., Yokota, H., Saito, K., Inukai, Y., Otsuru, N., & Onishi, H. (2021). The Number or Type of Stimuli Used for Somatosensory Stimulation Affected the Modulation of Corticospinal Excitability. Brain sciences, 11(11), . https://doi.org/10.3390/brainsci11111494
Kojima, Sho, et al. "The Number or Type of Stimuli Used for Somatosensory Stimulation Affected the Modulation of Corticospinal Excitability." Brain sciences vol. 11,11 (2021). doi: https://doi.org/10.3390/brainsci11111494
Kojima S, Miyaguchi S, Yokota H, Saito K, Inukai Y, Otsuru N, Onishi H. The Number or Type of Stimuli Used for Somatosensory Stimulation Affected the Modulation of Corticospinal Excitability. Brain Sci. 2021 Nov 12;11(11). doi: 10.3390/brainsci11111494. PMID: 34827493; PMCID: PMC8615945.
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Brain Sci. 2021 Nov 12;11(11). doi: 10.3390/brainsci11111494.

The Number or Type of Stimuli Used for Somatosensory Stimulation Affected the Modulation of Corticospinal Excitability.

Brain sciences

Sho Kojima, Shota Miyaguchi, Hirotake Yokota, Kei Saito, Yasuto Inukai, Naofumi Otsuru, Hideaki Onishi

Affiliations

  1. Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, 1398 Shimami-cho, Kita-Ku, Niigata-City 950-3198, Niigata, Japan.

PMID: 34827493 PMCID: PMC8615945 DOI: 10.3390/brainsci11111494

Abstract

Motor evoked potentials (MEPs) evoked by transcranial magnetic stimulation (TMS) a few milliseconds after this cortical activity following electrical stimulation (ES) result in an inhibition comparable to that by TMS alone; this is called short-latency afferent inhibition (SAI). Cortical activity is observed after mechanical tactile stimulation (MS) and is affected by the number of stimuli by ES. We determined the effects of somatosensory stimulus methods and multiple conditioning stimuli on SAI in 19 participants. In experiment 1, the interstimulus intervals between the conditioning stimulation and TMS were 25, 27 and 29 ms for ES and 28, 30 and 32 ms for MS. In experiment 2, we used 1, 2, 3 and 4 conditioning stimulations of ES and MS. The interstimulus interval between the ES or MS and TMS was 27 or 30 ms, respectively. In experiment 1, MEPs were significantly decreased in both the ES and MS conditions. In experiment 2, MEPs after ES were significantly decreased in all conditions. Conversely, MEPs after MS were significantly decreased after one stimulus and increased after four stimulations, indicating the SAI according to the number of stimuli. Therefore, the somatosensory stimulus methods and multiple conditioning stimuli affected the SAI.

Keywords: electrical stimulation; mechanical tactile stimulation; short-latency afferent stimulation; transcranial magnetic stimulation

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