Upper Left image shows rCBF distribution in a group (n=92) of
     Normal controls during rest. Note the normal hyperfrontal flow pattern

     Upper Right image shows rCBF distribution in a group (n=18)
     of Normal controls performing AQT.

     Lower Left image A statistical analysis (Student) of the difference
     between the group of Normal subjects and the group performing the
     AQT.
     Note the increased activation in the parietal lobes and the
     prefrontal cortical deactivation.

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