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Neuromagnetic Somatosensory Responses to Natural Moving Tactile Stimulation

Published online by Cambridge University Press:  02 December 2014

Yung-Yang Lin  and
Matti Kajola
Yung-Yang Lin
Affiliation:
Integrated Brain Research Unit, Department of Medical Research and Education, and Neurology, Neurological Institute, Taipei Veterans General Hospital; National Yang-Ming University School of Medicine, Taipei, Taiwan; Brain Research Unit, Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland
Matti Kajola
Affiliation:
Integrated Brain Research Unit, Department of Medical Research and Education, and Neurology, Neurological Institute, Taipei Veterans General Hospital; National Yang-Ming University School of Medicine, Taipei, Taiwan; Brain Research Unit, Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland
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Abstract

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Objective:

To explore the somatosensory cortical responses to natural moving tactile stimulation in adult subjects using magnetoencephalography.

Methods:

We measured cortical somatosensory magnetic evoked fields (SEFs) to moving tactile stimuli by a brush over the right thumb once every 1.5 s in seven subjects. Electric SEFs with various intensity or simulated jitter were used for comparison.

Results:

Tactile SEFs in primary somatosensory cortex (SI) consisted of two deflections: N24mT and P55mT. Electric SEFs consisted of N24mE, P30mE, P40mE, and P55mE. The amplitude of N24mT was only 34% ± 12% of N24mE, whereas P55mT and P55mE were of about the same size. With increased jitter or decreased intensity, attenuation of electric SEFs was more clearly found in early deflection than late deflection.

Conclusions:

Natural moving tactile stimulation produced simpler cortical somatosensory waveforms in comparison with electric SEFs, partly related to less sharp intensity and stimulation jitter with moving tactile stimulation. We propose that of all the afferent fibers conveying the early deflection, the low threshold components participate the generation of the late deflection.

Résumé:

RÉSUMÉ: Objectif:

Explorer les potentiels corticaux somesthésiques à la stimulation tactile mobile naturelle chez des adultes au moyen de la magnétoencéphalographie.

Méthodes:

Nous avons mesuré les champs évoqués magnétiques somesthésiques corticaux (SEFs) à la stimulation tactile mobile du pouce droit à toutes les 1.5 secondes chez sept sujets. Les SEFs électriques d’intensité variable ou les secousses simulées ont été utilisés pour fins de comparaison.

Résultats:

Les SEFs tactiles dans le cortex somesthésique primaire comportaient deux déflexions: N24mT et P55mT. Les SEFs électriques étaient N24mE, P30mE, P40mE et P55mE. L’amplitude de N24mT était de seulement 34% ± 12% de celle de N24mE, alors que P55mT et P55mE étaient à peu près de la même dimension. Avec l’augmentation des secousses ou la diminution de l’intensité, l’atténuation des SEFs électriques était plus évidente dans la déflexion précoce que dans la déflexion tardive.

Conclusions:

La stimulation tactile mobile naturelle a produit des ondes somesthésiques corticales plus simples que les SEFs électriques, en partie parce que la stimulation tactile mobile produit une stimulation moins aiguë. Nous proposons que, de toutes les fibres afférentes transmettant la déflexion précoce, les composantes à seuil bas participent à la génération de la déflexion tardive.

Type
Research Article
Information
Canadian Journal of Neurological Sciences , Volume 30 , Issue 1 , February 2003 , pp. 31 - 35
Copyright
Copyright © The Canadian Journal of Neurological 2003

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