Evoked field

When you go to the doctor and they put stickers on your head, those stickers are called electrodes. They help the doctor see what's going on in your brain. Every time you see or hear something, your brain makes a little electrical signal. The electrodes can detect these signals and create a picture of your brain activity.

Now, let's say the doctor wants to see how your brain responds to a sound. They'll play a beep in your ear and the electrodes will pick up the signal your brain makes in response to that sound. That signal is called an "evoked field."

It's kind of like when you play a game of "telephone" with your friends. Everyone whispers the same message and it gets passed along until the last person says it out loud. The "evoked field" is like the message that gets passed along in your brain when it hears a sound or sees something.

Doctors can use evoked fields to help diagnose certain medical conditions or to understand how our brain processes information. It's pretty cool!