为什么抱臂能帮助抑制疼痛

To the list of unusual antidotes for pain — including cursing, meditation and giving a massage — now add crossing your arms.
独特的疼痛解毒剂列表包括骂人，冥想和按摩，如今还增加了抱臂。

A new study published in the journal Pain found that when people crossed their arms, it reduced their perception of pain.  The pain source was a "piNPRick" sensation caused by the heat from a laser aimed at one of their hands.
发表在《疼痛》杂志上一项新的研究发现，当人们抱臂时，会减少他们的疼痛感。疼痛的来源是由对准手的激光的高温引起的“针刺”疼痛感。

The research involved two experiments — one that included eight participants and another that included 12. The first experiment measured participants' responses to the stimulation itself while their hands were either at their sides or crossed over each other. The second experiment looked at the brain regions activated.
研究人员进行两个实验——一个有8个参与者，另一个有12个参与者。第一个实验是随便让参与者的手放在两边或抱臂，测试他们对刺激的反应。第二个实验是观察活跃的脑区。

Researchers led by Giandomenico Iannetti of University College London found that when people's hands were crossed to other side of their bodies, it confused the brain by interrupting the processing of information incoming from multiple regions. Ianetti says the confusion results from a misalignment between the brain's external mapping of where it normally assumes the hands will be (on the appropriate side of the body) and its internal map of the physical source of the new pain information.
英国伦敦大学学院由Giandomenico Iannetti带领的研究人员发现，当人们双手交叉抱臂时，它会通过打断各个区域产生的信息处理，使大脑感到困惑。Ianetti称这种困惑是由大脑通常认为手所处位置的外部映射和来自身体新的疼痛的内部映射的协调引起的。