A functional magnetic resonance imaging study of human brain in pain-related areas induced by electrical stimulation with different intensities.

Abstract:

BACKGROUND:Pain-related studies have mainly been performed through traditional methods, which lack the rigorous analysis of anatomical locations. Functional magnetic resonance imaging (fMRI) is a noninvasive method detecting neural activity, and has the ability to precisely locate related activations in vivo. Moreover, few studies have used painful stimulation of changed intensity to investigate relevant functioning nuclei in the human brain. AIM:This study mainly focused on the pain-related activations induced by electrical stimulation with different intensities using fMRI. Furthermore, the electrophysiological characteristics of different pain-susceptible-neurons were analyzed to construct the pain modulatory network, which was corresponding to painful stimulus of changed intensity. MATERIALS AND METHODS:Twelve volunteers underwent functional scanning receiving different electrical stimulation. The data were collected and analyzed to generate the corresponding functional activation maps and response time curves related to pain. RESULTS:The common activations were mainly located in several specific regions, including the secondary somatosensory cortex (SII), insula, anterior cingulate cortex (ACC), thalamus, and other cerebral regions. Moreover, innocuous electrical stimulation primarily activated the lateral portions of SII and thalamus, as well as the posterior insula, anterior ACC, whereas noxious electrical stimulation primarily activated the medial portions of SII and thalamus, as well as the anterior insula, the posterior ACC, with larger extensions and greater intensities. CONCLUSION:Several specified cerebral regions displayed different response patterns during electrical stimulation by means of fMRI, which implied that the corresponding pain-susceptible-neurons might process specific aspects of pain. Elucidation of functions on pain-related regions will help to understand the delicate pain modulation of human brain.

journal_name

Neurol India

journal_title

Neurology India

authors

Yuan W,Ming Z,Rana N,Hai L,Chen-wang J,Shao-hui M

doi

10.4103/0028-3886.73748

subject

Has Abstract

pub_date

2010-11-01 00:00:00

pages

922-7

issue

6

eissn

0028-3886

issn

1998-4022

pii

ni_2010_58_6_922_73748

journal_volume

58

pub_type

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