The International Symposium on Positron Emission Tomography of the Brain was held at Schloss Auel in Lohmar, near Cologne, FRG, on May 3rd to 8th, 1982. This isolated place was chosen to bring together and keep together people active in research employing PET. The partic ipants were asked to report their ongoing work, to discuss upcoming problems, and to indicate future developments. In contrast to the large international meetings which suffer from lack of time for discussion and are affected by the distractions of major cities, our symposium provided ample opportunity for discussion during...