Nowadays, functional magnetic resonance imaging is still under research for all its possible applications. Its major problem seems to be its low technical specificity which does not allow to accurately distinguish main from secondary activation areas. On the other hand, the technique is very sensitive to variations in the type of stimulus used to achieve cortical activation. It is still to be determined which stimulus is more adequate for each pathology. Due to the lack of appropriate evidence on the usefulness of fMRI for its different applications, it is still considered under research and it is not usually covered by different health systems.