To investigate the working memory (WM) system, we record electrical signals from people's brains while they hold onto and process pieces of information. We ask people to remember things, such as numbers, words, or pictures. Then, our electrical recordings show us what brain cells called "neurons" do when people remember things after a short time (usually between 1 s and 1 min). When neurons are active, they deliver very small electric currents (much smaller than currents from wall sockets). These WM experiments show that the electric currents change depending on how much information you remember.
Normally, you have to remember a lot of things at once. For example, to understand this article, you have to remember what you just read while you are still reading. Maybe you're also thinking about what is for dinner, where you're having dinner, and when you have to be there. Remembering all of these different things depends on an electric current that cycle three to eight times per second. This means that some neurons in the human brain fire together over and over again between three and eight times in 1 s.

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