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Updated: May 29, 2026

Intracortical Inhibition Within the Primary Motor Cortex Can Be Modulated by Changing the Focus of Attention
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Intracortical Inhibition Within the Primary Motor Cortex Can Be Modulated by Changing the Focus of Attention

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Magnetic stimulation intensity modulates motor inhibition.

U Berger1, A Korngreen2, I Bar-Gad2

  • 1Department of Psychology, Bar Ilan University, Israel.

Neuroscience Letters
|September 24, 2011
PubMed
Summary

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Low-intensity repetitive transcranial magnetic stimulation (rTMS) decreases motor cortex excitability, while high-intensity stimulation increases it. This suggests distinct neural processes underlie rTMS effects at different intensities.

Area of Science:

  • Neuroscience
  • Neuromodulation

Background:

  • Repetitive transcranial magnetic stimulation (rTMS) is a key tool in neuroscience research and clinical applications.
  • The interaction between subthreshold stimulation intensity and low frequencies in rTMS requires further investigation.

Purpose of the Study:

  • To investigate the effects of different intensities of low-frequency rTMS on motor cortex excitability.
  • To explore the relationship between rTMS intensity and motor evoked potential (MEP) magnitude.

Main Methods:

  • Applied 1Hz rTMS over the motor cortex at 40%, 80%, and 100% of resting motor threshold (rMT).
  • Measured cortical excitability via motor evoked potentials (MEPs) from the abductor pollicis brevis (APB) muscle before and after stimulation.

Main Results:

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Last Updated: May 29, 2026

Intracortical Inhibition Within the Primary Motor Cortex Can Be Modulated by Changing the Focus of Attention
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Published on: September 11, 2017

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Combined Peripheral Nerve Stimulation and Controllable Pulse Parameter Transcranial Magnetic Stimulation to Probe Sensorimotor Control and Learning
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Combined Peripheral Nerve Stimulation and Controllable Pulse Parameter Transcranial Magnetic Stimulation to Probe Sensorimotor Control and Learning

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  • Low-intensity (40% rMT) rTMS significantly decreased MEP magnitude.
  • 80% rMT stimulation showed non-significant MEP inhibition.
  • High-intensity (100% rMT) stimulation resulted in increased MEP magnitude.

Conclusions:

  • The input-output relationship of motor cortex activation by rTMS is intensity-dependent.
  • Distinct neural processes, potentially involving different cell types (interneurons, pyramidal neurons), mediate rTMS effects at varying intensities.