Upper  Left images shows rCBF distribution in a group (n=12) of
     Normal controls during rest (base line).

     Upper Right image shows rCBF distribution in the same group
     (n=12) studied during FAS activation.

     Below is a statistical analysis (Student) of the difference between the
     two studies. Note the significant changes.

    Image courtesy: Siegbert Warkentin, Ass.Prof., Director of
    CBF-laboratory, Neuropsychiatric Clinic and Dept.of Clinical
    Physiology, University hospital MAS, Malmö, Sweden