瘙痒和挠痒有什么科学依据吗?
<p><span word="The">The</span> <span word="experiment">experiment</span> <span word="was">was</span> <span word="not">not</span> <span word="for">for</span> <span word="the">the</span> <span word="squirmish">squirmish</span>. <span word="Volunteers">Volunteers</span> <span word="were">were</span> <span word="made">made</span> <span word="to">to</span> <span word="itch">itch</span> <span word="like">like</span> <span word="crazy">crazy</span> <span word="on">on</span> <span word="one">one</span> <span word="arm">arm</span>, <span word="but">but</span> <span word="not">not</span> <span word="allowed">allowed</span> <span word="to">to</span> <span word="scratch">scratch</span>. <span word="Then">Then</span> <span word="they">they</span> <span word="were">were</span> <span word="whisked">whisked</span> <span word="into">into</span> <span word="an">an</span> <span word="M">M</span>.<span word="R">R</span>.<span word="I">I</span>. <span word="scanner">scanner</span> <span word="to">to</span> <span word="see">see</span> <span word="what">what</span> <span word="parts">parts</span> <span word="of">of</span> <span word="their">their</span> <span word="brains">brains</span> <span word="lit">lit</span> <span word="up">up</span> <span word="when">when</span> <span word="they">they</span> <span word="itched">itched</span>, <span word="when">when</span> <span word="researchers">researchers</span> <span word="scratched">scratched</span> <span word="them">them</span> <span word="and">and</span> <span word="when">when</span> <span word="they">they</span> <span word="were">were</span> <span word="finally">finally</span> <span word="allowed">allowed</span> <span word="to">to</span> <span word="scratch">scratch</span> <span word="themselves">themselves</span>.</p><p>首先要申明的是，做这个实验可不是要存心折磨人——研究人员通过某些手段致使志愿者们一条手臂痒得发疯，却不允许他们用任何方式挠痒。然后再将他们送入磁共振(<span word="MRI">MRI</span>)扫描仪，观察他们感到痒痒时，当研究人员帮他们挠痒，以及当他们终于得以自己挠痒时，他们的大脑中分别有哪些部位处于活跃状态。</p><p><span word="The">The</span> <span word="scientific">scientific</span> <span word="question">question</span> <span word="was">was</span> <span word="this">this</span>: <span word="Why">Why</span> <span word="does">does</span> <span word="it">it</span> <span word="feel">feel</span> <span word="so">so</span> <span word="good">good</span> <span word="to">to</span> <span word="scratch">scratch</span> <span word="an">an</span> <span word="itch">itch</span>?</p><p>这项研究所要解决的科学问题是：为什么挠痒的感觉这么爽？</p><p>"<span word="It">It</span>'<span word="s">s</span> <span word="quite">quite</span> <span word="intriguing">intriguing</span> <span word="to">to</span> <span word="see">see</span> <span word="how">how</span> <span word="many">many</span> <span word="brain">brain</span> <span word="centers">centers</span> <span word="are">are</span> <span word="activated">activated</span>," <span word="said">said</span> <span word="Dr">Dr</span>. <span word="Gil">Gil</span> <span word="Yosipovitch">Yosipovitch</span>, <span word="chairman">chairman</span> <span word="of">of</span> <span word="dermatology">dermatology</span> <span word="at">at</span> <span word="the">the</span> <span word="Temple">Temple</span> <span word="University">University</span> <span word="School">School</span> <span word="of">of</span> <span word="Medicine">Medicine</span> <span word="and">and</span> <span word="director">director</span> <span word="of">of</span> <span word="the">the</span> <span word="Temple">Temple</span> <span word="Center">Center</span> <span word="for">for</span> <span word="Itch">Itch</span> (<span word="he">he</span> <span word="conducted">conducted</span> <span word="the">the</span> <span word="experiment">experiment</span> <span word="while">while</span> <span word="working">working</span> <span word="at">at</span> <span word="Wake">Wake</span> <span word="Forest">Forest</span> <span word="School">School</span> <span word="of">of</span> <span word="Medicine">Medicine</span>). "<span word="There">There</span> <span word="is">is</span> <span word="no">no</span> <span word="one">one</span> <span word="itch">itch</span> <span word="center">center</span>. <span word="Everyone">Everyone</span> <span word="wants">wants</span> <span word="that">that</span> <span word="target">target</span>, <span word="but">but</span> <span word="it">it</span> <span word="doesn">doesn</span>'<span word="t">t</span> <span word="work">work</span> <span word="in">in</span> <span word="real">real</span> <span word="life">life</span> <span word="like">like</span> <span word="that">that</span>."</p><p>“观察有多少大脑中枢受到激活，这差事相当有趣，”美国天普大学医学院(<span word="Temple">Temple</span> <span word="University">University</span> <span word="School">School</span> <span word="of">of</span> <span word="Medicine">Medicine</span>)的皮肤学系主任，天普大学瘙痒中心(<span word="Temple">Temple</span> <span word="Center">Center</span> <span word="for">for</span> <span word="Itch">Itch</span>)主任吉尔·杨斯波维奇(<span word="Gil">Gil</span> <span word="Yosipovitch">Yosipovitch</span>)博士说。（他在威克森林大学[<span word="Wake">Wake</span> <span word="Forest">Forest</span> <span word="School">School</span> <span word="of">of</span> <span word="Medicine">Medicine</span>]工作时已经开展这项实验）。“大脑中并没有一个专门的瘙痒中枢。当然大家都希望能有这样一个靶标可以用来对付瘙痒，可现实并不总能尽如人意。”</p>
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