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- W4210519431 abstract "Abstract While previous research using transcranial magnetic stimulation (TMS) suggest that cerebellum (CB) influences the neuroplastic response of primary motor cortex (M1), the role of different indirect (I) wave inputs in M1 mediating this interaction remains unclear. The aim of this study was therefore to assess how CB influences neuroplasticity of early and late I-wave circuits. 22 young adults (22 ± 2.7 years) participated in 3 sessions in which I-wave periodicity repetitive transcranial magnetic stimulation (iTMS) was applied over M1 during concurrent application of cathodal transcranial direct current stimulation over CB (tDCS CB ). In each session, iTMS either targeted early I-waves (1.5 ms interval; iTMS 1.5 ), late I-waves (4.5 ms interval; iTMS 4.5 ), or had no effect (variable interval; iTMS Sham ). Changes due to the intervention were examined with motor evoked potential (MEP) amplitude using TMS protocols measuring corticospinal excitability (MEP 1mV ) and the strength of CB-M1 connections (CBI). In addition, we indexed I-wave activity using short-interval intracortical facilitation (SICF) and low-intensity single-pulse TMS applied with posterior-anterior (MEP PA ) and anterior-posterior (MEP AP ) current directions. Following both active iTMS sessions, there was no change in MEP 1mV , CBI or SICF (all P > 0.05), suggesting that tDCS CB broadly disrupted the excitatory response that is normally seen following iTMS. However, although MEP AP also failed to facilitate after the intervention ( P > 0.05), MEP PA potentiated following both active iTMS sessions (both P < 0.05). This differential response between current directions suggests that the disruptive effects of CB modulation on M1 plasticity may be selectively mediated by AP-sensitive circuits (also likely recruited with MEP 1mV , CBI, and SICF)." @default.
- W4210519431 created "2022-02-08" @default.
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- W4210519431 date "2022-01-31" @default.
- W4210519431 modified "2023-09-24" @default.
- W4210519431 title "Cerebellar transcranial direct current stimulation disrupts neuroplasticity of intracortical motor circuits" @default.
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- W4210519431 doi "https://doi.org/10.1101/2022.01.30.478397" @default.
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