当你和一位朋友在超市走散后，你会扫描人群，可你并不会仔细盘查每一张脸，而是迅速把那些身材过高、过矮、穿得颜色不匹配的人筛选掉。
When you and a friend become separated in the mall, you scan the crowd, not scrutinizing every face but quickly filtering out everyone who's too tall, too short, wearing the wrong color of clothing.
我们现在已经有了像神经成像和全基因组扫描那样的工具来搜寻与阿尔茨海默氏症有关的基因，以及经一大批经过长时间随访的人群样本。
We now have such tools as neuroimaging and genome-wide scans that hunt for genes related to risk, as well as big samples of people who've been followed over time.
比利时根特大学的西蒙·库恩博士与他英国和德国的同事一道分析了150多名青少年的脑部扫描结果，这些青少年都被归类为中等或非常喜欢玩电动游戏的人群。
Dr Simon Kuhn of Ghent University in Belgium and colleagues in the UK and Germany analysed brain scans of more than 150 teenagers who were classified as playing video games either moderately or a lot.
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