What is an MRI?
Magnetic Resonance Imaging (MRI) is a technique for taking pictures of the inside of your body without radiation. MRI images are made by placing the body in a strong magnetic field using a scanner. We use a version of this technique called functional MRI to try to understand which areas of the brain are activated during cognitive processes.
Listed below are some excellent web pages about Magnetic Resonance Imaging if you want more information:
http://www.cis.rit.edu/htbooks/mri/inside.htm
http://www.med.harvard.edu/AANLIB/hms1.html