生物谷導讀：雙手交叉這種姿勢多代表社交中的防守型姿態(tài),，而現(xiàn)在科學家又發(fā)現(xiàn)了它的一個新用途——減輕疼痛。
圖片來源：ALAMY
據(jù)新華社電 英國倫敦大學學院科學家發(fā)現(xiàn),，雙臂交叉放于胸前的姿勢不僅舒服,，而且可以在某種程度上減輕痛感。
研究中,，研究者用激光在8名志愿者的手臂上制造“純痛感”,，而后用腦電圖監(jiān)測志愿者的痛感變化。“純痛感”指不接觸型疼痛,，一般持續(xù)時間短,。在這項研究中，研究者用激光灼燒志愿者手臂皮膚,，每次時間僅4毫秒,。結果發(fā)現(xiàn)，當志愿者雙臂交叉放于胸前時,，這種痛感奇妙地減輕了,。
結論已經(jīng)試驗證實，但原因還沒有定論,。英國倫敦大學學院生理學,、藥理學和神經(jīng)學系教授詹多梅尼科·揚內蒂認為，雙臂交叉的姿勢致使大腦中“兩幅圖產(chǎn)生混亂”,。這兩幅圖分別是自身人體圖和外部空間圖,。
路透社20日援引揚內蒂的話報道，通常情況下,，人類用左手感知左邊的世界,，用右手感知右邊的世界，因此,，控制左半身的大腦通常會在激活時調用左邊空間的感知圖,，控制右半身的大腦在激活時調用右邊空間的感知圖。
“而你把雙臂交叉時,，這些大腦圖便亂了套,，”揚內蒂說，從而使大腦處理傳遞信息的能力變弱,，因此對痛感的感知會遲鈍和削弱,。（生物谷Bioon.com）
生物谷提供文獻索引摘要：
PAIN Volume 152, Issue 6 , Pages 1418-1423, June 2011
The analgesic effect of crossing the arms
A. Gallace, D.M.E. Torta,G.L. Moseley,G.D. Iannetti
The ability to determine precisely the location of sensory stimuli is fundamental to how we interact with the world; indeed, to our survival. Crossing the hands over the body midline impairs this ability to localize tactile stimuli. We hypothesized that crossing the arms would modulate the intensity of pain evoked by noxious stimulation of the hand. In two separate experiments, we show (1) that the intensity of both laser-evoked painful sensations and electrically-evoked nonpainful sensations were decreased when the arms were crossed over the midline, and (2) that these effects were associated with changes in the multimodal cortical processing of somatosensory information. Critically, there was no change in the somatosensory-specific cortical processing of somatosensory information. Besides studies showing relief of phantom limb pain using mirrors, this is the first evidence that impeding the processes by which the brain localises a noxious stimulus can reduce pain, and that this effect reflects modulation of multimodal neural activities. By showing that the neural mechanisms by which pain emerges from nociception represent a possible target for analgesia, we raise the possibility of novel approaches to the treatment of painful clinical conditions.
鏈接：http://www.painjournalonline.com/article/S0304-3959(11)00138-2/abstract
