The test records the electrical activity of the brain.

这个测试显示出大脑的电流活动。

《柯林斯英汉双解大词典》

In fact, various emotional states give rise to certain patterns of electrical activity in the facial muscles and in the brain.

事实上，不同的情绪状态会在面部肌肉和大脑中产生特定的脑电活动模式。

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This measures the electrical activity of the wearer's brain, in much the same way as some machines used for medical and research proposes, and communicates wirelessly with a clock unit near the bed.

与一些用于医疗研究的机器所采用的方法非常相似，它可以测量佩戴者的脑电波活动，并且可以与佩戴者床边的一个时钟部件进行无线连接。

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Other kinds of operations can block the spread of electrical activity in the brain.

VOA: special.2010.10.26

Early on, after graduating from Harvard with plans to become a psychoanalyst, he detoured into research after becoming fascinated with new methods for probing the electrical activity of brain neurons.

FORBES: Viagra for the Brain

They categorised facial dimensions such as the distance between the eyes, then recorded the electrical activity of one brain cell at a time while they showed cartoons to the macaques.

ECONOMIST: Facial characteristics

Once this rat pressed the correct lever, its brain activity was delivered as electrical stimulation into the brain of the second rat - designated the "decoder".

BBC: One rat brain 'talks' to another using electronic link