“…Thus in GTS patients abnormalities in the basal ganglia and frontal cingulate and possibly insular cortex have been reported (Chase et at., 1984(Chase et at., , 1986, while non-specific frontal abnormalities (Behar et at., 1984, Garber et at., 1989 and basal ganglia dysfunction, especially in the caudate nucleus, and orbito-fronta1 cortex have been suggested as of aetiological importance in OCD (Laplane et at., 1981(Laplane et at., , 1982Baxter et at., 1987;Luxenberg et at., 1988;Williams et at., 1988;Swedo et at., 1989). Further evidence for the link comes from the fact that there are studies indicating that genetic factors may be important in both the aetiology of OCD (Luxenburger, 1930;Lewis, 1935;Brown, 1942;Kringlen, 1965;Rosenberg, 1967;Carey, 1978;Insel et at., 1983;Rasmussen and Tsuang, 1986;Lenane et at., 1988; and GTS (KurIan et at., 1986(KurIan et at., , 1987Robertson and Gourdie, 1990;Robertson and Trimble, 1990). However, further work in the area is needed to know the exact genetic mechanisms involved in GTS and OCD, and whether OCD is related genetically and phenomenologically to GTS.…”