PTE考生目前最大的问题之一就是练习题缺乏。除了有限的基本官方书(PLUS,Testbuilder, OG)之外就没有题了。很多英语基础不是很扎实的同学很难找到练习材料。墨尔本文波雅思PTE培训学校专门为墨尔本,悉尼PTE考生准备了适合PTE听力阅读练习的科学60秒。各位PTE同学可以练习PTE听力中的summarise spoken text和PTE口语中的retell lecture,练习记笔记技巧和复述。废话少说,下面开始:

60秒科学:Brain State Bread Crumbs Lead Way Back to Consciousness


60秒科学节目(SSS)是科学美国人网站的一套广播栏目,英文名称:Scientific American – 60 Second Science,节目内容以科学报道为主,节目仅一分钟的时间,主要对当今的科学技术新发展作以简明、通俗的介绍,对于科学的发展如何影响人们的生活环境、健康状况及科学技术,提供了大量简明易懂的阐释。

Consciousness is one of the biggest mysteries of the brain. But maybe even more intriguing is what goes on when we lose consciousness—and how do we find our way back? Now, researchers studying anesthetized rats have discovered a handful of activity patterns that may help mark the path to consciousness. The findings are in the Proceedings of the National Academy of Sciences. [Andrew E. Hudson et al, Recovery of consciousness is mediated by a network of discrete metastable activity states]

The anesthetized brain is not actually quiet. It shows patterns of spontaneous activity that can change over time. But as the brain wakes, how do these random splashes of activity morph into the vigorous chatter of the conscious mind?

To find out, researchers looked for common patterns in the brain activity of rats as they were put under anesthesia and brought back. And they discovered a number of patterns that took place consistently. A few seemed to serve as stepping stones from deep anesthesia to waking, as if the brain were finding its way through a maze of possible activity states on the way back to consciousness.

Knowing how the brain reboots itself may help physicians better predict recovery from brain injury or even coma, and should lead to a better understanding of how to keep us under.

—Karen Hopkin


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