“…Abnormalities in metabolic activity in the orbitofrontal cortex, medial prefrontal cortex, or both, have been found in major depression (Drevets et al, 1992), depression associated with Parkinson's and Huntington's diseases (Mayberg et al, 1900(Mayberg et al, , 1992, obsessive-compulsive disorder (OCD; Baxter et al, 1988Baxter et al, , 1992Swedo et al, 1989Swedo et al, , 1992Benkelfat et al, 1990;Sawle et al, 1991;Rubin et al, 1992), Gilles de la Tourette syndrome (Baxter et al, 1990), and schizophrenia (Andreason et al, 1992) Imaging studies of the basal ganglia have raised the possibility that in such neuropsychiatric illnesses, and also in the course of normal behavior, the prefrontal cortex operates in conjunction with the caudate nucleus (Baxter et al, 1988(Baxter et al, , 1992Swedo et al, 1989;Drevets et al, 1992;Cummings, 1993;Rauch et al, 1994). This new evidence supports the concept developed from earlier anatomical and lesion studies that different areas of the prefrontal cortex interact with different parts of the caudate nucleus to form high-level functional subsystems within the forebrain (Teuber and Proctor, 1964;Iversen and Mishkin, 1970;Divac, 1972;Rosvold 1972;Iversen, 1979).…”