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Related Experiment Video

Updated: May 7, 2026

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

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

Published on: September 11, 2017

Selective changes in cerebellar-cortical processing following motor training.

H Haavik¹, B A Murphy

¹Research Division, New Zealand College of Chiropractic, Auckland, New Zealand.

Experimental Brain Research

|September 26, 2013

Summary

This summary is machine-generated.

This study found that a stimulation rate of 4.98 Hz is optimal for measuring somatosensory evoked potential (SEP) N24 peaks after repetitive typing. This rate minimizes N30 contamination, enhancing N24 visibility for tracking neurological changes.

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Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation

Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation

Published on: February 23, 2020

Area of Science:

Neuroscience
Neurophysiology
Biomedical Engineering

Background:

Somatosensory evoked potentials (SEPs) reflect neural activity along the somatosensory pathway.
Specific SEP peaks, such as N18, N20, and N24, are associated with subcortical and cerebellar processing.
Understanding how stimulation parameters and motor tasks affect these peaks is crucial for accurate neurophysiological assessment.

Purpose of the Study:

To investigate the impact of varying stimulation frequencies (2.47, 4.98, 9.90 Hz) on SEP peak amplitudes.
To examine the effects of a repetitive typing task on SEP peak amplitudes, particularly those related to cerebellar function.
To determine the optimal stimulation frequency for measuring SEP changes after a motor task.

Main Methods:

SEPs were recorded from 12 subjects using median nerve stimulation at the wrist.
Stimulation was delivered at three different frequencies (2.47, 4.98, 9.90 Hz) before and after a 20-minute typing task.
Data analysis involved ANOVA for stimulation rate effects and paired t-tests for typing task effects.

Main Results:

Increasing stimulation frequency significantly decreased the N30 SEP peak amplitude.
The N24 amplitude increased post-typing at 2.47 and 4.98 Hz, while the N18 amplitude significantly decreased across all frequencies.
Typing rate increased and error rate decreased after the task.

Conclusions:

A stimulation frequency of 4.98 Hz is recommended for measuring the N24 SEP peak, as it reduces N30 contamination and allows for clearer observation of changes related to repetitive motor activity.
Observed changes in N18 and N24 amplitudes suggest that the typing task may alter cerebellar-cortical processing by reducing inhibition in structures like the cuneate nucleus or inferior olives.