This is also true with people who have a head injury. Some parts of the brain will work fine while others are in need of repair or are slowly being reconnected. As previously stated, the brain consists of about 100 billion cells. Most of these cells are called neurons. Doctors have learned that measuring this electrical activity can tell how the brain is working.
Different neurons use different types of chemicals.
Even in the simplified model that I'm presenting, it gets more complex. Neither of the above is correct. Let's look at the brain using a different model. Let's look at the brain as an orchestra. In an orchestra, you have different musical sections.