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读心机
一个加州的研究团队开发了一种可以通过扫描人体大脑所发生的变化从而预测出这个人正在看一些什么样的物体的方法。
当你注视一些物体时，你的眼睛会发送一个关于该物体的信号到你的大脑中。大脑的不同区域处理眼睛发送的这些信号。大脑中负责这个过程的细胞叫做神经元。
FMBI(功能性磁振造影)脑扫描可以大体地比较大脑中人们对所观察物体基本形状的电运动。
像身体中其他地方的细胞一样，活跃的神经元细胞也需要氧气。血液为神经元提供氧气，神经元越活跃，对氧气量的需求越大。大脑中越是活跃的区域，它的神经元也就越活跃，为此，更多的血液会流经这一区域。那么通过使用FMBI，科学家可以使大脑中接收相对多的富氧血液的部分可视化。因此，可视化的部分就是处理信息的部分
FMRI机是一种可以扫描大脑和测量流向大脑的血液变化的设备。这项技术为研究者显示，当人们思考观察进行像说话阅读这样的活动时，大脑运动的变化。通过突出显示人们观看不同图像时头脑工作的区域，FMRI可以帮助科学家们确定与不同图像相关的大脑活动的具体形式。
加州的研究者让两个志愿者观察数百个诸如人、动物和水果这样的日常事物。他们用这样方式来测试大脑的活动。科学家使用FMRI机来记录志愿者看每一张图片时大脑的活动。显示这一活动时，不同物体会使志愿者大脑的不同区域在扫描时亮度增加。科学家利用此信息来建立一种模式去预测大脑对所看到事物可能如何反映。
在第二个测试中，科学家让志愿者看120个新图像。和以前一样，他们每看一张新图像时大脑都被扫描一次。这次，科学家用他们的模式来比较FMRI扫描的图像。例如，如果图像在第二次测试显示相同的形式的大脑活动，同时，该脑活动与在第一次测试中苹果图片有大关联，那么这个模式可能会预测出志愿者们正在看一些苹果。
Mind-reading Machine
A team of researchers in California has developed a way to predict what kinds of objects people are looking at by scanning what's happening in their brains.When you look at something, your eyes send a signal about that object to your brain.Different regions of the brain proce the information your eyes send.Cells in your brain called neurons are responsible for this proceing.The fMRI(functional Magnetic Resonance Imaging)brain scans could generally match electrical activity in the brain to the basic shape of a picture that someone was looking at.Like cells anywhere else in your body, active neurons use oxygen.Blood brings oxygen to the neurons, and the more active a neuron is, the more oxygen it will consume.The more active a region of the brain, the more active its neurons, and in turn, the more blood will travel to that region.And by using fMRI, scientists can visualize which parts of the brain receive more oxygen-rich blood--and therefore, which parts are working to proce information.An fMRI machine is a device that scans the brain and measures changes in blood flow to the brain.The technology shows researchers how brain activity changes when a person thinks, looks at something, or carries out an activity like speaking or reading.By highlighting the areas of the brain at work when a person looks at different images, fMRI may help scientists determine specific patterns of brain activity aociated with different kinds of images.The California researchers tested brain activity by having two volunteers view hundreds of pictures of everyday objects, like people, animals, and fruits.The scientists used an fMRI machine
to record the volunteers' brain activity with each photograph they looked at.Different objects caused different regions of the volunteers' brains to light up on the scan, indicating activity.The scientists used this information to build a model to predict how the brain might respond to any image the eyes see.In a second test, the scientists asked the volunteers to look at 120 new pictures.Like before, their brains were scanned every time they looked at a new image.This time, the scientists used their model to match the fMRI scans to the image.For example, if a scan in the second test showed the same pattern of brain activity that was strongly, related to pictures of apples in the first test, their model would have predicted the volunteers were looking at apples.
