<human>:  How does the fMRI work?
<bot>: fMRI is a type of magnetic resonance imaging that measures blood flow in the brain. It is used to study the brain and how it works. It is a non-invasive technique that uses a magnetic field and radio waves to measure the blood flow in the brain. The magnetic field is used to align the protons in the blood, which causes the protons to emit radio waves. The radio waves are then detected by the scanner and used to create an image of the brain.