These are called electroencephalograms, or EEGs for short. Recordings of brain wave activity look like a series of waves. These are attached to the surface of the skin in specific places around the head. Electrodes are devices able to record electrical changes over time. Measuring electrical activity in the brain is usually done with electrodes. When a huge group of neurons signal at once, however, they can be recorded and measured with the help of special tools. Just one or two neurons signaling is too small a change to be noticed. When neurons send a signal they use electrical currents to pass messages to other nearby neurons. These electrical waves are called brain waves. How do you tell if the brain is working? What is it doing and how do you measure it? The head gear on the right that looks like it's from a work of science fiction measures electrical activity in the brain.
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