Exploring the brain in pain: activations, deactivations and their relation.

Exploring the brain in pain: activations, deactivations and their relation.
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DOI:
10.1016/j.pain.2009.11.008
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发表时间:
2010-02
期刊:
影响因子:
7.4
通讯作者:
Gollub RL
Gollub RL
中科院分区:
医学1区
文献类型:
--
作者:
Kong J;Loggia ML;Zyloney C;Tu P;LaViolette P;Gollub RL

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大多数关于疼痛的神经影像学研究都集中在BOLD激活的研究上,而很少关注失活。在这项研究中,在一个相对较大的受试者队列中(N=61),我们评估了:a)在应用两种不同的热痛水平(HIGH和LOW)时大脑的激活和失活程度;b)这两个方向的fMRI信号变化之间的关系。此外,在我们的一部分受试者(N=12)中,我们评估了c)静息状态下疼痛激活或非激活区域的功能连通性。如前所述,我们发现疼痛刺激诱导强度依赖性(高痛>低痛)的fMRI信号在整个疼痛矩阵中增加。同时,有害的刺激会导致几个大脑区域的活动减少,包括默认网络(DMN)的一些“核心结构”。与我们观察到的信号增加相反,低疼痛刺激比高疼痛刺激的失活程度更大。相关分析和功能连接分析进一步支持了激活和失活网络之间的功能分离。我们的研究结果表明,疼痛激活和失活之间没有线性关系,因此表明这些大脑信号的变化是疼痛体验的不同方面的基础。
The majority of neuroimaging studies on pain focus on the study of BOLD activations, and more rarely on deactivations. In this study, in a relatively large cohort of subjects (N=61), we assess: a) the extent of brain activation and deactivation during the application of two different heat pain levels (HIGH and LOW) and b) the relations between these two directions of fMRI signal change. Furthermore, in a subset of our subjects (N=12), we assess c) the functional connectivity of pain-activated or -deactivated regions during resting states. As previously observed, we find that pain stimuli induce intensity dependent (HIGH pain > LOW pain) fMRI signal increases across the pain matrix. Simultaneously, the noxious stimuli induce activity decreases in several brain regions, including some of the ‘core structures’ of the default network (DMN). In contrast to what we observe with the signal increases, the extent of deactivations is greater for LOW than HIGH pain stimuli. The functional dissociation between activated and deactivated networks is further supported by correlational and functional connectivity analyses. Our results illustrate the absence of a linear relationship between pain activations and deactivations, and therefore suggest that these brain signal changes underlie different aspects of the pain experience.
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