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Examining motor evoked potential amplitude and short‐interval intracortical inhibition on the up‐going and down‐going phases of a transcranial alternating current stimulation (tacs) imposed alpha oscillation
European Journal of Neuroscience ( IF 3.698 ) Pub Date : 2021-01-22 , DOI: 10.1111/ejn.15124
Ann‐Maree Vallence 1 , Kathryn Dansie 2 , Mitchell R. Goldsworthy 3, 4 , Suzanne M. McAllister 5 , Ruiting Yang 6 , John C. Rothwell 7 , Michael C. Ridding 8
Affiliation  

Many brain regions exhibit rhythmical activity thought to reflect the summed behaviour of large populations of neurons. The endogenous alpha rhythm has been associated with phase‐dependent modulation of corticospinal excitability. However, whether exogenous alpha rhythm, induced using transcranial alternating current stimulation (tACS) also has a phase‐dependent effect on corticospinal excitability remains unknown. Here, we triggered transcranial magnetic stimuli (TMS) on the up‐ or down‐going phase of a tACS‐imposed alpha oscillation and measured motor evoked potential (MEP) amplitude and short‐interval intracortical inhibition (SICI). There was no significant difference in MEP amplitude or SICI when TMS was triggered on the up‐ or down‐going phase of the tACS‐imposed alpha oscillation. The current study provides no evidence of differences in corticospinal excitability or GABAergic inhibition when targeting the up‐going (peak) and down‐going (trough) phase of the tACS‐imposed oscillation.

中文翻译:

检查经颅交流电刺激(tacs)的运动诱发电位振幅和短时皮质内抑制对上行和下行相位的影响

许多大脑区域表现出节律活动,被认为反映了大批神经元的合计行为。内源性α节律与皮质脊髓兴奋性的相位依赖性调节有关。然而,使用经颅交流电刺激(tACS)诱导的外源性α节律是否也对皮质脊髓兴奋性有相位依赖性。在这里,我们在tACS施加的α振荡的上升或下降阶段触发了经颅磁刺激(TMS),并测量了运动诱发电位(MEP)振幅和短间隔皮质内抑制(SICI)。在tACS施加的α振荡的上升或下降阶段触发TMS时,MEP幅度或SICI均无显着差异。
更新日期:2021-01-22
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