This next segment is going to trigger some serious deja vu. It`s not because we`ve covered it before, but if some reason you think we have, you`re probably in the age range when people experience deja vu the most often.

下面的内容将会引起时空效应。并不是因为我们之前报道过类似的现象，如果你觉着我们有理由的话，可能在这个年龄段的人都有过似曾相识的感觉。

Dr. Sanjay Gupta explores what it is exactly and the latest ideas from the medical community about why we experience it.

桑基古·普塔博士探索了时空效应到底是什么，并且从医学界的最新观点探索了我们为什么会有这样的体验。

You know, I suddenly have this feeling that I`ve told you this before.

我突然就有了那种感觉，之前我就跟你跟你说过。

You know, it happens without warning, the strange feeling that you`ve been there, done that, even though you know you never have.

这种感觉没有任何警示，这种奇怪的感觉仿佛你去过一些地方，做过一些事情，而实际你从没有到过那些地方。

The French have a word for it deja vu, meaning already seen.

在法语中有一个词用来解释“deja vu”，这个词的意思是已经见过了。

Now, while some claimed deja vu is a evidence of the paranormal such as past lives or alien abductions, other says we partially absorb scenes from television or movies to feel a sense of familiarity. It could be that our visual cortex is so fast at sending signals to our memory center, the hippocampus, that some believe the feeling of having seen it before is true, and it is true, but we saw it just a split second earlier.

现在，一些人声称这是前世或者外星人绑架的超自然现象，而其他人称我们能从电视或者电影中获得熟悉的感觉。这种现象发生可能是因为我们的视觉皮质在向记忆中心，“海马体”发送信号时，速度很快。有些人认为，这种似曾相识的感觉是真的，这是的确真的，但是我们对这种画面仅是稍纵即逝。

About two-thirds of us experience deja vu, and oddly enough, it seems to happen most often between the ages of 15 and 25. So, it could be linked to the ongoing development of the brain. Scientists aren`t really sure. Because deja vu occurs randomly among healthy people, it`s been hard to study.

大约有2/3的人有过这种时空效应，奇怪的是，这种现象常发生在15到25岁的群体中。因此，它可能与大脑持续发展有关。科学家们也并不确定。因为这种似曾相识的感觉是在健康人体中时随机发生的，因此很难进行研究。

Now, we do know deja vu occurs in the medial temporal lobe, that`s this area of the brain over here. That`s where the rhinal cortex, the part of the brain that helps us recognize familiar, interacts with the hippocampus, that`s the part of the brain that stores details of specific memories.

现在，我们知道这种现象发生在内侧颞叶，这大脑的区域。这是顶叶皮层，此部分有利于帮助我们识别熟悉的场景，并与海马体相互作用，大脑此处区域用于存储特定记忆的详细信息。

Perhaps signals there get crossed, could be that brain circuits convulsed in an almost sort of seizure. And actually, you know what? That makes sense, because people with epilepsy do experience deja vu at the onset of the seizure. So, it`s now on epilepsy where most of today`s research is underway. In fact, neurologists have been able to trigger deja vu and people with epilepsy by stimulating, you guessed it, their medial temporal lobes.

也许信息会交叉，这可能是因为大脑回路震撼引起的。实际上，你知道吗?这是讲得通的，因为癫痫患者在发病时，会产生似曾相识的感觉。所以，现在癫痫病的研究正在进行中。实际上，神经学家已经能够通过刺激癫痫患者的内侧颞叶触引发似曾相识的感觉。

This next segment is going to trigger some serious deja vu. It`s not because we`ve covered it before, but if some reason you think we have, you`re probably in the age range when people experience deja vu the most often.

Dr. Sanjay Gupta explores what it is exactly and the latest ideas from the medical community about why we experience it.

You know, I suddenly have this feeling that I`ve told you this before.

You know, it happens without warning, the strange feeling that you`ve been there, done that, even though you know you never have.

The French have a word for it deja vu, meaning already seen.

Now, while some claimed deja vu is a evidence of the paranormal such as past lives or alien abductions, other says we partially absorb scenes from television or movies to feel a sense of familiarity. It could be that our visual cortex is so fast at sending signals to our memory center, the hippocampus, that some believe the feeling of having seen it before is true, and it is true, but we saw it just a split second earlier.

About two-thirds of us experience deja vu, and oddly enough, it seems to happen most often between the ages of 15 and 25. So, it could be linked to the ongoing development of the brain. Scientists aren`t really sure. Because deja vu occurs randomly among healthy people, it`s been hard to study.

Now, we do know deja vu occurs in the medial temporal lobe, that`s this area of the brain over here. That`s where the rhinal cortex, the part of the brain that helps us recognize familiar, interacts with the hippocampus, that`s the part of the brain that stores details of specific memories.

Perhaps signals there get crossed, could be that brain circuits convulsed in an almost sort of seizure. And actually, you know what? That makes sense, because people with epilepsy do experience deja vu at the onset of the seizure. So, it`s now on epilepsy where most of today`s research is underway. In fact, neurologists have been able to trigger deja vu and people with epilepsy by stimulating, you guessed it, their medial temporal lobes.