The effects of drugs on behavior are of inherent interest and psycho pharmacology has provided a focus for research activity for many years. Until recently, however, it could be claimed that the contribution of pharmacology was more obvious than that of psychology in the de velopment of what should surely prove to be a matter for interdis ciplinary endeavor. Pharmacological analyses of drug action have frequently been expressed in terms of dose-response functions, for ex ample, with the dependent variable taking the form of patterns of be havior whose controlling influences were but poorly...