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Neural recording is a method of observing neural activity. It has provided neuroscience with a picture of how the nervous system works.

The collective activity of many brain areas, some containing almost 100,000 neurons per cubic millimeter of tissue, allows the nervous system to mediate our sensory perceptions, thoughts, decisions, and movements. These neurons communicate with one another via synaptic connections, of which there are upwards of one hundred million in the same cubic millimeter. With so many neurons, so tightly packed together, how can we possibly observe their activity?

A major problem in studying neural activity is that in most animals, the brain is enclosed in a hard bony skull. This has led to various noninvasive approaches to record the activity of neurons, such as electroencephalography ...

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