The following papers were presented at an international workshop on benzo diazepine receptor ligands, memory and information processing, held during the 15th CINP meeting in Puerto Rico in December 1986 and organised by the editors and T. Roth. This workshop was aimed at reviewing and reflecting on past experience with benzodiazepines, evaluating the current state of knowledge of the actions of psychotropic orugs (particularly benzodiazepines, fJ-carbolines and benzodiazepine antagonists), and laying a basis of interest and speculation for future research into the potential use of these drugs...