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Updated: Dec 25, 2025
Author Spotlight: Methodologies and Advancements of Chronic Pain Management Research
Published on: January 5, 2024
A Simple Pattern of Movement is not Able to Inhibit Experimental Pain in FM Patients and Controls: an sLORETA Study
Eleonora Gentile1, Katia Ricci1, Eleonora Vecchio1
1Applied Neurophysiology and Pain Unit, SMBNOS Department, Bari Aldo Moro University, Polyclinic General Hospital, 70121 Bari, Italy.
Abstract:
Motor cortex activation seems to induce an analgesic effect on pain that would be different between patients with fibromyalgia (FM) and control subjects. This study was conducted to analyze the changes of the laser-evoked potentials (LEPs) induced during a finger tapping task in the FM patients and the controls employing a multi-dipolar analysis according to Standardized low resolution brain electromagnetic tomography (sLORETA) method. The LEPs from 38 FM patients and 21 controls were analyzed. The LEPs were recorded while subjects performed a slow and a fast finger tapping task. We confirmed that the difference between N1, N2 and P2 wave amplitudes between conditions and groups was not significant. In control subjects, the fast finger tapping task induced a modification of cortical source activation in the main areas processing laser stimulation from the moving hand independently from the movement speed. In summary, a simple and repetitive movement is not able to induce consistent inhibition of experimental pain evoked by the moving and the not moving hand in each group. It could interfere with LEP sources within the limbic area at least in control subjects, without inhibit cortical responses or explain the different pattern of motor and pain interaction in FM patients.
Insights
Simple finger tapping did not consistently inhibit experimental pain in fibromyalgia patients or controls. This study explored laser-evoked potentials (LEPs) and brain activity during movement, finding no significant pain modulation in fibromyalgia.
Area of Science:
- Neuroscience
- Pain Research
- Medical Imaging
Background:
- Motor cortex activation may influence pain perception differently in fibromyalgia (FM) patients compared to healthy individuals.
- Understanding the interaction between motor control and pain processing is crucial for developing novel therapeutic strategies.
Purpose of the Study:
- To investigate changes in laser-evoked potentials (LEPs) during a finger tapping task in FM patients and controls.
- To analyze cortical source activity using standardized low-resolution brain electromagnetic tomography (sLORETA) to understand pain modulation mechanisms.
Main Methods:
- Multi-dipolar analysis of LEPs was performed on 38 FM patients and 21 controls.
- Subjects underwent slow and fast finger tapping tasks while LEPs were recorded.
- sLORETA was employed to analyze brain electromagnetic activity.
Main Results:
- No significant differences in N1, N2, and P2 wave amplitudes were observed between conditions or groups.
- In controls, fast finger tapping altered cortical source activation in areas processing laser stimulation.
- A simple, repetitive movement did not consistently inhibit experimental pain in either group.
Conclusions:
- Simple repetitive movements do not consistently inhibit experimental pain in FM patients or controls.
- The findings suggest that finger tapping may interfere with limbic area LEP sources in controls.
- This study did not reveal consistent cortical inhibition or explain the distinct motor-pain interaction patterns in FM patients.
