 - Magnetic resonance imaging MRI scans allow researchers to study brain activity and changes to brain function. When specific psychological tests are performed during functional MRI fMRI scans, researchers can examine the effects of drug use on the brain. By developing and testing new procedures for fMRI studies, more information can be obtained on brain function and activity in drug-using and non-drug-using individuals, and this information can help develop new treatments and therapies for substance abuse. 