Objective: The aim of the study was to show that short-lasting (90 s) transcranial alternating current stimulation (tACS) at 20 Hz delivered over the left primary motor cortex (M1) is able to change the shape of recruitment curve of the corticospinal pathway. Methods: The corticospinal pathway was studied during tACS by means of the relationship between the intensity of transcranial magnetic stimulation (TMS) delivered over the left M1 and corresponding motor evoked potentials (MEPs) recorded from the right first dorsal interosseus muscle (FDI), in nine healthy subjects. In order to extract characteristics of the input-output relationship that have particular physiological relevance, data were fitted to the Boltzmann sigmoidal function by the Levenberg-Marquardt nonlinear, least mean squares algorithm. Results: The β-rhythm tACS influenced the shape and parameters of the input-output relation, so that the initial segment of the conditioned curve (from threshold to 30% of maximum muscle size) diverged, while the subsequent segment converged to overlap the unconditioned control curve. Discussion: β-rhythm tACS conditions only a definite subset of corticospinal elements influencing less than 30% of the entire motoneuronal pool. The fact that β-rhythm tACS mainly affects the most excitable motoneurons could explain the observed antikinetic effect of the tACS at β-rhythm applied in the motor regions. © 2021 Informa UK Limited, trading as Taylor & Francis Group.

Rossi, A., Feurra, M., Rossi, S., Santarnecchi, E., Ginanneschi, F. (2021). Impact of β-range-induced oscillatory activity on human input-output relationship of the corticospinal pathway. NEUROLOGICAL RESEARCH, 43(6), 496-502 [10.1080/01616412.2020.1870358].

Impact of β-range-induced oscillatory activity on human input-output relationship of the corticospinal pathway

Rossi Alessandro
Writing – Original Draft Preparation
;
Feurra Matteo
Supervision
;
Rossi Simone
Supervision
;
Santarnecchi Emiliano
Supervision
;
Ginanneschi Federica
Writing – Review & Editing
2021-01-01

Abstract

Objective: The aim of the study was to show that short-lasting (90 s) transcranial alternating current stimulation (tACS) at 20 Hz delivered over the left primary motor cortex (M1) is able to change the shape of recruitment curve of the corticospinal pathway. Methods: The corticospinal pathway was studied during tACS by means of the relationship between the intensity of transcranial magnetic stimulation (TMS) delivered over the left M1 and corresponding motor evoked potentials (MEPs) recorded from the right first dorsal interosseus muscle (FDI), in nine healthy subjects. In order to extract characteristics of the input-output relationship that have particular physiological relevance, data were fitted to the Boltzmann sigmoidal function by the Levenberg-Marquardt nonlinear, least mean squares algorithm. Results: The β-rhythm tACS influenced the shape and parameters of the input-output relation, so that the initial segment of the conditioned curve (from threshold to 30% of maximum muscle size) diverged, while the subsequent segment converged to overlap the unconditioned control curve. Discussion: β-rhythm tACS conditions only a definite subset of corticospinal elements influencing less than 30% of the entire motoneuronal pool. The fact that β-rhythm tACS mainly affects the most excitable motoneurons could explain the observed antikinetic effect of the tACS at β-rhythm applied in the motor regions. © 2021 Informa UK Limited, trading as Taylor & Francis Group.
2021
Rossi, A., Feurra, M., Rossi, S., Santarnecchi, E., Ginanneschi, F. (2021). Impact of β-range-induced oscillatory activity on human input-output relationship of the corticospinal pathway. NEUROLOGICAL RESEARCH, 43(6), 496-502 [10.1080/01616412.2020.1870358].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/1124380