This volume is intended to provide students and investigators of brain-be­ havior relationships with an understanding of the current concepts of the role of catecholamines in the regulation of behavior. Catecholamines are now believed to be modulators or transmitters in systems regulating a number of important aspects of behavioral function. The present intense interest in catecholamines is reflected by the large number of scientific reports dealing with these compounds. Even those reports which are rele­ vant to behavior are staggering in number. The contributors to this book have drawn on the salient literature, as well as on their own work, with a view toward clarifying relationships between the basic neurobiology of cate­ cholaminergic neural systems and normal and abnormal behavioral func­ tion. Current work in this field is heavily dependent on the use of psychotropic drugs to produce model behavioral states, or as biological probes. As a result psychopharmacological studies are generously represented. I n the last chapter of Volume 2 the editor has attempted to further relate and develop the material in the two volumes from the con­ ceptual and theoretical standpoint. New York AJF Contributors to Volume 2 Wagner H. Bridger, Department oj Psychiatry, Albert Einstein College oj Medicine, Bronx, New York Thomas R. Bozewicz, Department oj Psychiatry, Albert Einstein College oj Medicine, Bronx, New York Doris H. C1ouet, Testing and Research Laboratory, New York State Drug Abuse Control Commission, Brooklyn, New York John M.