隔离预期对疼痛影响的大脑机制:基于线索的刺激预期与基于安慰剂的治疗预期
Elizabeth A Necka1, Titilola Akintola1, Qingbao Yu1
1National Center for Complementary and Integrative Health, National Institutes of Health, Bethesda, Maryland 20892.
概括
对安慰剂治疗和疼痛预测线索的期望不同地调节疼痛. 在安慰剂条件下,预测线索对疼痛的影响较弱,这表明这些期望类型的神经通路不同.
科学领域:
- 神经科学是一个神经科学.
- 心理学 心理学 心理学
- 疼痛研究 疼痛研究
背景情况:
- 疼痛感知受到期望的显著影响,包括安慰剂止痛和疼痛预测线索.
- 了解不同类型的期望背后的神经机制对于疼痛管理至关重要.
研究的目的:
- 调查安慰剂镇痛和疼痛预测线索是否通过共享或独特的神经通路调节疼痛.
- 在疼痛调制中,区分基于提示的与基于治疗的预期的神经基质.
主要方法:
- 功能磁共振成像 (fMRI) 用于研究40名健康志愿者.
- 参与者在疼痛预测线索 (高/低疼痛) 和安慰剂/对照剂的条件下对有害热的疼痛反应进行了评分.
- 分析了行为和神经成像数据,以确定暗示类型和安慰剂条件之间的相互作用.
主要成果:
- 显著的相互作用显示,与对照组相比,安慰剂组的预测线索对疼痛的影响较弱.
- 对于纯粹的暗示效应和纯粹的安慰剂效应,观察到不同的神经基质.
- 预测线索调节了 nociceptive 区域和神经疼痛特征的反应,而只有面额前环和背中前额叶皮层受到两种期望类型的类似影响.
结论:
- 基于线索的对刺激强度的期望和基于安慰剂的对治疗结果的期望是不同的过程.
- 疼痛研究人员在研究疼痛调节时应区分期望的来源.
- 临床医生应该注意关于即将到来的疼痛的信息是如何呈现的,因为基于暗示的预期的强效.
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