挠痒两个字挺有意思的，到底挠是为了让它痒，还是痒而挠它呢？只能说中文如此博大精深。
大多数人都有痒点，周身都怕痒的人好像也常见。据说当被人挠痒你的时候，笑是一种自然反应。而且这种被挠的感觉容易让人“发狂”，其实也是对毛骨悚然的爬行动物的一种自然抵触吧。例如昆虫爬动的细微的痒感，就是为了让你知道有东西正在你身上爬。
一个人如果在越不想被挠，或者如果知道自己马上要被挠痒了的时候被挠，会比平时更加容易感觉到痒。因为那种不舒服和感觉自己可能会不舒服感觉，就会开始让自己发笑。
所以人到底可不可以把自己挠痒呢？很多答案并没有确定。但研究说明大脑被训练得能忽略因自己动作而产生的感知，比如讲话的时候我们不会注意自己的声带怎么动的。也就是说，能预见自己动作的大脑早就做好准备，挠痒自己也就无从说起了。
Most of us have a ticklish容易痒的 spot somewhere on our bodies, and it is usually pretty easy to find.
For some it's just above the knee, for others it's the back of the neck, and some of us go into fits of laughter if someone grabs our sides.Laughing when another person tickles you is a natural reaction.
Scientists have discovered that the feeling experienced when we are tickled causes us to panic and is a natural defense to little creepy crawlers爬行动物 like spiders and bugs.
Slight tickles from insects can send a chill through your body, letting you know something is crawling on you.
That same ticklish feeling sends us into a state of panic and elicits引起 a response of uncontrollable laughter if a person tickles us.
It's the moment that you least expect to be tickled and that causes you to feel extremely uneasy and panicked, which leads to the most intense ticklish feeling.强烈的痒感
Even if you do know that you are about to be tickled, the fear and unease of someone touching and possibly hurting you causes you to laugh.Some people are so ticklish that they begin laughing even before they are touched.So, if someone else's touch can tickle us, why can't we tickle ourselves?
Much of the explanation for this question is still unknown, but research has shown that the brain is trained to know what to feel when a person moves or performs any function.We aren't aware of a lot of the sensations generated by our movements.
For example, you probably don't pay much attention to your vocal cords声带 when you speak.For the same reason, we can't tickle ourselves.If we grab our sides in an attempt to tickle ourselves, our brain anticipates this contact from the hands and prepares itself for it.
By taking away the feeling of unease and panic, the body no longer responds the sameas it would if someone else were to tickle us
