Every day MRI is gaining more and more appreciation by all me die al specialists for its impressive quality of anatomical images. This morphological information gives consistent help in terms of earlier diagnosis, lesion characterisation, and definition of the extent of disease. However, morphology is not the only infor mation obtained through MRI. Recently, a large number of researchers have exploited the possibility of also obtaining functional information with MRI. Results of brain activation studies have been initially performed in Boston and have been confirmed by investiga tors all over...