scholarly journals Short interval intracortical inhibition: Variability of amplitude and threshold-tracking measurements with 6 or 10 stimuli per point

2022 ◽  
Author(s):  
Hatice Tankisi ◽  
Bülent Cengiz ◽  
Gintaute Samusyte ◽  
James Howells ◽  
Martin Koltzenburg ◽  
...  
Keyword(s):  
Short Interval ◽  
Intracortical Inhibition ◽  
Threshold Tracking

ID 108 – Reproducibility of short interval intracortical inhibition using threshold-tracking

2016 ◽  
Vol 127 (3) ◽  
pp. e67 ◽  
Author(s):  
G. Samusyte ◽  
H. Bostock ◽  
J.C. Rothwell ◽  
M. Koltzenburg
Keyword(s):  
Short Interval ◽  
Intracortical Inhibition ◽  
Threshold Tracking

P157 Reliability of threshold tracking technique for short interval intracortical inhibition

2017 ◽  
Vol 128 (3) ◽  
pp. e93 ◽  
Author(s):  
G. Samusyte ◽  
H. Bostock ◽  
J. Rothwell ◽  
M. Koltzenburg
Keyword(s):  
Short Interval ◽  
Intracortical Inhibition ◽  
Tracking Technique ◽  
Threshold Tracking

Inter-session reliability of short-interval intracortical inhibition measured by threshold tracking TMS

2018 ◽  
Vol 674 ◽  
pp. 18-23 ◽  
Author(s):  
José Manuel Matamala ◽  
James Howells ◽  
Thanuja Dharmadasa ◽  
Terry Trinh ◽  
Yan Ma ◽  
...  
Keyword(s):  
Short Interval ◽  
Intracortical Inhibition ◽  
Threshold Tracking

scholarly journals Test-retest reliability of short-interval intracortical inhibition assessed by threshold-tracking and automated conventional techniques

eNeuro ◽  
2021 ◽  
pp. ENEURO.0103-21.2021
Author(s):  
Christina S. Nielsen ◽  
Gintaute Samusyte ◽  
Kirsten Pugdahl ◽  
Jakob U. Blicher ◽  
Anders Fuglsang-Frederiksen ◽  
...  
Keyword(s):  
Short Interval ◽  
Intracortical Inhibition ◽  
Retest Reliability ◽  
Threshold Tracking ◽  
Test Retest Reliability

scholarly journals Short-interval intracortical inhibition: Comparison between conventional and threshold-tracking techniques

2018 ◽  
Vol 11 (4) ◽  
pp. 806-817 ◽  
Author(s):  
Gintaute Samusyte ◽  
Hugh Bostock ◽  
John Rothwell ◽  
Martin Koltzenburg
Keyword(s):  
Short Interval ◽  
Intracortical Inhibition ◽  
Threshold Tracking

scholarly journals Cortical excitability varies across different muscles

2018 ◽  
Vol 120 (3) ◽  
pp. 1397-1403 ◽  
Author(s):  
Parvathi Menon ◽  
Matthew C. Kiernan ◽  
Steve Vucic
Keyword(s):  
Transcranial Magnetic Stimulation ◽  
Magnetic Stimulation ◽  
Functional Organization ◽  
Cortical Excitability ◽  
Short Interval ◽  
Intracortical Inhibition ◽  
Body Regions ◽  
Threshold Tracking ◽  
Resting Motor Threshold ◽  
Limb Muscles

The aim of the present study was to determine whether significant differences in cortical excitability were evident across different body regions in healthy humans. Threshold tracking transcranial magnetic stimulation (TMS) was undertaken in 28 healthy controls. Short-interval intracortical inhibition [SICI between interstimulus intervals (ISI) 1–7 ms], intracortical facilitation (ICF, between ISI 10–30 ms), resting motor threshold (RMT), cortical silent period (CSP) duration (generated at stimulus intensity 150% RMT), and motor evoked potential amplitude were recorded from the abductor pollicis brevis (APB), tibialis anterior (TA), and trapezius muscles. These muscles were selected as they are frequently affected in neurodegenerative diseases, such as amyotrophic lateral sclerosis. SICI and ICF are measured as a percentage difference between conditioned and an unconditioned test response. SICI was significantly greater when recorded over the APB (9.9 ± 1.5%) and TA (8.6 ± 1.4%) muscles compared with the trapezius (4.5 ± 1.9%, P < 0.05). The CSP duration was significantly shorter (CSPtrapezius, 131.0 ± 6.3 ms; CSPTA, 175.7 ± 9.9 ms; CSPAPB, 188.3 ± 4.0 ms; P < 0.001) and ICF greater ( P < 0.01) in the trapezius muscle. There were no significant correlations between inhibitory and facilitatory processes recorded across the three muscles. The present study established significant differences in cortical excitability across three body regions, with evidence of more prominent inhibition and less facilitation in the limb muscles. NEW & NOTEWORTHY Cortical excitability of muscles with differing motor functions was assessed using threshold tracking transcranial magnetic stimulation. Significantly greater intracortical inhibition and less facilitation were evident over the limb muscles. These findings could relate to differences in the functional organization of the corticomotoneuronal system innervating different muscle regions.

scholarly journals Modulation of intracortical inhibition during physically performed and mentally simulated balance tasks

2021 ◽  
Vol 121 (5) ◽  
pp. 1379-1388
Author(s):  
A. Mouthon ◽  
J. Ruffieux ◽  
W. Taube
Keyword(s):  
Motor Evoked Potentials ◽  
Action Observation ◽  
Short Interval ◽  
Intracortical Inhibition ◽  
Mental Simulation ◽  
Task Execution ◽  
Postural Tasks ◽  
Execution Condition ◽  
The One ◽  
Postural Task

Abstract Purpose Action observation (AO) during motor imagery (MI), so-called AO + MI, has been proposed as a new form of non-physical training, but the neural mechanisms involved remains largely unknown. Therefore, this study aimed to explore whether there were similarities in the modulation of short-interval intracortical inhibition (SICI) during execution and mental simulation of postural tasks, and if there was a difference in modulation of SICI between AO + MI and AO alone. Method 21 young adults (mean ± SD = 24 ± 6.3 years) were asked to either passively observe (AO) or imagine while observing (AO + MI) or physically perform a stable and an unstable standing task, while motor evoked potentials and SICI were assessed in the soleus muscle. Result SICI results showed a modulation by condition (F2,40 = 6.42, p = 0.009) with less SICI in the execution condition compared to the AO + MI (p = 0.009) and AO (p = 0.002) condition. Moreover, switching from the stable to the unstable stance condition reduced significantly SICI (F1,20 = 8.34, p = 0.009) during both, physically performed (− 38.5%; p = 0.03) and mentally simulated balance (− 10%, p < 0.001, AO + MI and AO taken together). Conclusion The data demonstrate that SICI is reduced when switching from a stable to a more unstable standing task during both real task execution and mental simulation. Therefore, our results strengthen and further support the existence of similarities between executed and mentally simulated actions by showing that not only corticospinal excitability is similarly modulated but also SICI. This proposes that the activity of the inhibitory cortical network during mental simulation of balance tasks resembles the one during physical postural task execution.

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