Inside your brain, you have over 80 billion neurons - tiny brain cells, all working together to make you the person you are.Neurons talk to each other by sending electrical messages. Each message creates a tiny magnetic field. If enough neurons are talking together, we can listen in on their conversations by measuring the magnetic field around your head.We call this MEG, which stands for magnetoencephalography (mag-netto-en-keffa-logra-fee).